High frequency welded pipe (ERW) is the hot rolled plate after molding machine molding, using high frequency current skin effect and proximity effect, make the edge of tube billet heating melt, in the role of squeezing roller pressure welding to achieve production.
High-frequency resistance welding method in the 50 s applied to welded pipe production. In nearly a decade, and its production technology improvement, continuously improve product quality. First is the quality of the ERW production materials have obvious difference, the steel composition design of the low C and low P, S, micro alloying; Smelting process of converter smelting, ladle refining, vacuum degassing, continuous casting and the adoption of new technology; In the process of rolling the use of controlled rolling and controlled cooling technology makes the appearance of the large and medium caliber ERW steel pipe with hot rolled steel belt size, appearance quality, physical and chemical performance is greatly improved.
Followed by the large and medium caliber ERW steel tube forming welding heat treatment process such as the production process to achieve the automatic computer control, high frequency welding heat input energy along with the computer in the process of automatic compensation system has been effectively controlled, prevent the welding heat input energy on the low side caused by cold welding, virtual welding, and heat input energy on the high side and burnt.
Medium frequency heat treatment temperature control of heat treatment process can according to the technological requirements to achieve coaxial flue the best effect, effectively guarantee the quality of welding seam and heat affected zone. In addition, the progress of detection technology, realized the full weld ultrasonic or online or offline eddy current exploration and hydrostatic test can also be under the monitor of the computer, pressure testing and regulated in accordance with requirements. ISO9000 series standards and the promotion and implementation of APIQ1 specification, the large and medium caliber ERW pipe production, testing, sales and service in a whole process of quality assurance. In recent years, countries are actively research using high frequency welded pipe (ERW) pipe instead of seamless pipe and spiral welded pipe, in the industrial developed countries, high frequency welded pipe under $ 610 mm diameter, ERW proportion has reached 70%.
stove pipe--https://www.chinaflue.com/product/%CF%8660100mm-coaxial-extension-flue/
High-frequency resistance welding method in the 50 s applied to welded pipe production. In nearly a decade, and its production technology improvement, continuously improve product quality. First is the quality of the ERW production materials have obvious difference, the steel composition design of the low C and low P, S, micro alloying; Smelting process of converter smelting, ladle refining, vacuum degassing, continuous casting and the adoption of new technology; In the process of rolling the use of controlled rolling and controlled cooling technology makes the appearance of the large and medium caliber ERW steel pipe with hot rolled steel belt size, appearance quality, physical and chemical performance is greatly improved.
Followed by the large and medium caliber ERW steel tube forming welding heat treatment process such as the production process to achieve the automatic computer control, high frequency welding heat input energy along with the computer in the process of automatic compensation system has been effectively controlled, prevent the welding heat input energy on the low side caused by cold welding, virtual welding, and heat input energy on the high side and burnt.
Medium frequency heat treatment temperature control of heat treatment process can according to the technological requirements to achieve coaxial flue the best effect, effectively guarantee the quality of welding seam and heat affected zone. In addition, the progress of detection technology, realized the full weld ultrasonic or online or offline eddy current exploration and hydrostatic test can also be under the monitor of the computer, pressure testing and regulated in accordance with requirements. ISO9000 series standards and the promotion and implementation of APIQ1 specification, the large and medium caliber ERW pipe production, testing, sales and service in a whole process of quality assurance. In recent years, countries are actively research using high frequency welded pipe (ERW) pipe instead of seamless pipe and spiral welded pipe, in the industrial developed countries, high frequency welded pipe under $ 610 mm diameter, ERW proportion has reached 70%.
stove pipe--https://www.chinaflue.com/product/%CF%8660100mm-coaxial-extension-flue/
Causing uneven wall thickness is thick-walled steel spiral puncher rolling centerline errors, two rolls of varying inclination or former head pressure adjustment amount is too small and so causes uneven, generally along the full length of the spiral steel pipe like distribution. The main measures are adjusted puncher rolling centerline so that the roll angle of the two are equal, according to the given parameter adjustment rolled sheet rolling machine.
Straight uneven wall thickness reason is pre-worn saddle height adjustment mandrel inappropriate to wear when exposed to certain pre-mandrel side of the capillary, resulting in capillary contact surface temperature drop too fast, resulting in uneven thickness even pull concave defects. Even rolling the roller gap is too small or too large. Rolling machine centerline deviation. Single, double rack uneven reduction will cause the direction of the ultra-thin single stand pipe (thick), two-rack direction thick (thin) the linear symmetry bias. The main measures are adjusted pre-worn saddle height mandrel, the mandrel and the guarantee of the capillary. Replace the hole and rolled specifications should roll gap measure, the actual roll gap and rolling tables consistent. Optical centerline of the device to adjust the rolling, rolling machine centerline must be corrected when the annual overhaul.
From the economic considerations, to meet the engineering requirements while minimizing costs, but often the result is easy to form the appearance of a small selection of the many varieties of pipe fittings in general, which is not conducive to the construction site materials management, regulation and design changes needed material substitution and so on. Therefore, the choice of pipe fittings, should be integrated security and economy, minimize pipe varieties appropriate. In addition, the construction site conditions, the level of construction, fittings chimney parts and supplies procurement cycle and other factors, it should cause the necessary attention in the selection of the tube. Under the circumstances, we should also consider strengthening fittings, as well as the possibility of miter bend small diameter tube bending and other field.
Head, tail tube wall thickness of the front because of uneven cut slope, bending through the large, tube-centering holes errors could easily lead to uneven wall thickness of the head seamless steel pipe. Perforation extension coefficient is too large, roll speed is too high, rolling instability. Puncher cast steel capillary instability could easily lead to the tail of uneven thickness. Measures to check the quality of the tube to prevent the tube front cut slope, depressed volume, replacement or repair should be corrected pass-centering holes. A lower perforated speed to ensure the stability and uniformity of the wall thickness of the rolled hair. When the roll speed adjustment, matching the guide plate is also adjusted accordingly.
vertical flue kit--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Straight uneven wall thickness reason is pre-worn saddle height adjustment mandrel inappropriate to wear when exposed to certain pre-mandrel side of the capillary, resulting in capillary contact surface temperature drop too fast, resulting in uneven thickness even pull concave defects. Even rolling the roller gap is too small or too large. Rolling machine centerline deviation. Single, double rack uneven reduction will cause the direction of the ultra-thin single stand pipe (thick), two-rack direction thick (thin) the linear symmetry bias. The main measures are adjusted pre-worn saddle height mandrel, the mandrel and the guarantee of the capillary. Replace the hole and rolled specifications should roll gap measure, the actual roll gap and rolling tables consistent. Optical centerline of the device to adjust the rolling, rolling machine centerline must be corrected when the annual overhaul.
From the economic considerations, to meet the engineering requirements while minimizing costs, but often the result is easy to form the appearance of a small selection of the many varieties of pipe fittings in general, which is not conducive to the construction site materials management, regulation and design changes needed material substitution and so on. Therefore, the choice of pipe fittings, should be integrated security and economy, minimize pipe varieties appropriate. In addition, the construction site conditions, the level of construction, fittings chimney parts and supplies procurement cycle and other factors, it should cause the necessary attention in the selection of the tube. Under the circumstances, we should also consider strengthening fittings, as well as the possibility of miter bend small diameter tube bending and other field.
Head, tail tube wall thickness of the front because of uneven cut slope, bending through the large, tube-centering holes errors could easily lead to uneven wall thickness of the head seamless steel pipe. Perforation extension coefficient is too large, roll speed is too high, rolling instability. Puncher cast steel capillary instability could easily lead to the tail of uneven thickness. Measures to check the quality of the tube to prevent the tube front cut slope, depressed volume, replacement or repair should be corrected pass-centering holes. A lower perforated speed to ensure the stability and uniformity of the wall thickness of the rolled hair. When the roll speed adjustment, matching the guide plate is also adjusted accordingly.
vertical flue kit--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
HotTapping can be done on almost all type of pipes, including Iron, Steel,Concrete, and Plastic. Herein the technician provides a branch connection to alive pipe (there is no need to shut down the operations). A short section ofpipe is used, to which an isolating valve is either welded or fitted by thetechnician. Once done with the fitting work (and the valve in the open position),the technician drills the pipe through the valve. Once the drilling iscompleted, the valve is closed and the drilling equipment is removed. This isthe process of Hot Tapping.boiler flue guard
Usuallythe process is completed without any leakage or loss of flow. Another wonderfulfeature of Hot Tapping Services is the fact that it can be performed on almostall types of pipes in live operation. There are a number of Hot TappingServices providers in the market. Almost all of them have their online presencewhere they showcase all their services and offer competitive quotes. Now, ifyou need Hot Tapping Services for your needs, you can choose one with greatease. Although there are many service providers in the market, you should selecta professional and experienced one.
Beginwith Internet Type your query in a popular search engine and press ENTER. Youwould be surprised to find out the numbers of Hot Tapping Services Providers inthe market. Now, take your time, go through the sites of some selected ones,and choose 3 or 4 out of all. Now, ask these selected service providers tooffer you a competitive quote. Once you receive these quotes, you are in a muchbetter position to choose an ideal one for your needs.
Anotherway to find a trusted Hot Tapping Services provider is by asking some of yourknown-ones in the business community. All this will help you find a reliableservice provider and get your damaged pipes repaired at the earliest.
At Allied Pipefreezing, we work in a widevariety of industries providing a range of pipeline isolation techniques # tosuit most customer requirements. With the benefit of our knowledge andexperience, we have satisfied customers in a variety of industries, includingOil & Gas, Pharmaceutical, Local Government, Healthcare Sector,Petrochemical, Manufacturing, Engineering, Education, Food, and Drink.
vertical flue kit--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Usuallythe process is completed without any leakage or loss of flow. Another wonderfulfeature of Hot Tapping Services is the fact that it can be performed on almostall types of pipes in live operation. There are a number of Hot TappingServices providers in the market. Almost all of them have their online presencewhere they showcase all their services and offer competitive quotes. Now, ifyou need Hot Tapping Services for your needs, you can choose one with greatease. Although there are many service providers in the market, you should selecta professional and experienced one.
Beginwith Internet Type your query in a popular search engine and press ENTER. Youwould be surprised to find out the numbers of Hot Tapping Services Providers inthe market. Now, take your time, go through the sites of some selected ones,and choose 3 or 4 out of all. Now, ask these selected service providers tooffer you a competitive quote. Once you receive these quotes, you are in a muchbetter position to choose an ideal one for your needs.
Anotherway to find a trusted Hot Tapping Services provider is by asking some of yourknown-ones in the business community. All this will help you find a reliableservice provider and get your damaged pipes repaired at the earliest.
At Allied Pipefreezing, we work in a widevariety of industries providing a range of pipeline isolation techniques # tosuit most customer requirements. With the benefit of our knowledge andexperience, we have satisfied customers in a variety of industries, includingOil & Gas, Pharmaceutical, Local Government, Healthcare Sector,Petrochemical, Manufacturing, Engineering, Education, Food, and Drink.
vertical flue kit--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Precision steel pipe refers to weak corrosive medium such as air, steam, water resistance and acid, alkali, salt and other chemical etching medium corrosion of the steel. Non-standard precision steel tube can be found everywhere in people’s production and living. This added elements such as chromium, nickel alloy, out of need to improve the corrosion resistance, necessary to reduce the carbon content, and low carbon content, strength is difficult to improve, it also limits the non-standard precision steel tube as structure to the application scope of data. Is there such a non-standard precision steel tube, can not only reduce the amount of precious metals to add to save costs, and the strength of materials can be increased to expand the application range, have good corrosion resistance to reduce the maintenance interest and improve the service life of the waste? In 2004 included in the national 973 plans to improve steel quality and the service life of the metallurgy "basic research project has been in 2009 through the acceptance, the project in order to improve the metallurgical quality as the foundation, with materials science as the guide, in order to prolong the service life of steel as the target. Main results are: design and develop low nickel, high strength, low cost, high abrasion resistance and low magnetic Stainless Steel Flues Suppliers or non-magnetic resource-conserving non-standard precision steel tube former steel; pressure existing metallurgical process of smelting and continuous casting is used to derive the nitrogen content of 0.64% high nitrogen steel; research developed economical metastable steel with high strength and high tenacity. These effects to improve the international competitiveness of ’s iron and steel enterprises, have broad market application prospect.
This kind of non-standard precision steel tube called high nitrogen steel. In the 1970 s, the world has a high nitrogen non-standard precision steel tube, with cheap abundant nitrogen instead of noble scarce nickel, but also improve the strength of non-standard precision steel tube and the local corrosion resistance.
Hinder the nitrogen as the main factors of alloy elements widely used is the addition of nitrogen, nitrogen solubility under atmospheric pressure is very low, it very difficult to join, because of the adding quantity is little, the net effect is not obvious, common mode of production of high nitrogen steel is pressurized smelting, need special production equipment, this greatly increased the production of high nitrogen steel interest and limiting the production. iron and steel production country, can you use the present general metallurgical equipment under ordinary conditions of refining the high nitrogen steel? According to the performance characteristics of high nitrogen steel, high nitrogen steel application since it has 304 non-standard precision steel tube and the extensive use of the considerable corrosion resistance, and has more than 2 times the 304 non-standard precision steel tube intensity, and the price is low, compared with 304 non-standard precision steel tube has great competitive advantage, therefore can replace 304 non-standard precision steel tube in the local area. So far, the group will focus on the original steel applied in the following several aspects: mining and coal washing abrasion resistant equipment; High strength non-standard precision steel pipe fasteners; High strength building steel; Bulletproof armor. Among them, use the original steel produced in the coal mine coal washing sieve, victory has been applied in industrial production, and showed excellent abrasion resistance. With national specification product quality supervision and inspection center, has developed victory M12 bolts, and prepare to further test the M20 bolts. Once the trial victory, and formulate the corresponding technical specification, which can be widely replace the current 304 non-standard precision steel pipe manufacturing fasteners, enormous economic benefits.
flue elbows--https://www.chinaflue.com/product/%CF%8660100mm-coaxial-extension-flue/
This kind of non-standard precision steel tube called high nitrogen steel. In the 1970 s, the world has a high nitrogen non-standard precision steel tube, with cheap abundant nitrogen instead of noble scarce nickel, but also improve the strength of non-standard precision steel tube and the local corrosion resistance.
Hinder the nitrogen as the main factors of alloy elements widely used is the addition of nitrogen, nitrogen solubility under atmospheric pressure is very low, it very difficult to join, because of the adding quantity is little, the net effect is not obvious, common mode of production of high nitrogen steel is pressurized smelting, need special production equipment, this greatly increased the production of high nitrogen steel interest and limiting the production. iron and steel production country, can you use the present general metallurgical equipment under ordinary conditions of refining the high nitrogen steel? According to the performance characteristics of high nitrogen steel, high nitrogen steel application since it has 304 non-standard precision steel tube and the extensive use of the considerable corrosion resistance, and has more than 2 times the 304 non-standard precision steel tube intensity, and the price is low, compared with 304 non-standard precision steel tube has great competitive advantage, therefore can replace 304 non-standard precision steel tube in the local area. So far, the group will focus on the original steel applied in the following several aspects: mining and coal washing abrasion resistant equipment; High strength non-standard precision steel pipe fasteners; High strength building steel; Bulletproof armor. Among them, use the original steel produced in the coal mine coal washing sieve, victory has been applied in industrial production, and showed excellent abrasion resistance. With national specification product quality supervision and inspection center, has developed victory M12 bolts, and prepare to further test the M20 bolts. Once the trial victory, and formulate the corresponding technical specification, which can be widely replace the current 304 non-standard precision steel pipe manufacturing fasteners, enormous economic benefits.
flue elbows--https://www.chinaflue.com/product/%CF%8660100mm-coaxial-extension-flue/
Welded joint surface
2020年9月24日 日常1. Basic requirements for the appearance of ERW straight seam steel pipe welds
Before the non-destructive testing of straight seam steel pipes(ERW pipe), the appearance inspection of welds should meet the requirements. The general requirements for the appearance of straight seam steel pipe welds and the surface quality of welded joints are as follows:
The appearance of welding should be well formed, and the width should be 2mm over the edge of the groove on each side. The height of the welding feet of Φ80mm Flue W8-90 fillet welds should meet the design requirements, and the shape should transition gently.
Welded joint surface:
(1) Cracks, unmelted, air holes, slag inclusions and splashes are not allowed.
(2) There should be no undercut on the weld surface of pipes with a design temperature lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to harden. The undercut depth of welding seam of other materials shall be greater than 0.5mm, the length of continuous undercut shall not be greater than 100mm, and the total length of undercut on both sides of the weld shall not be greater than 10% of the total length of the weld.
(3) The surface of the welding seam shall not be lower than the surface of the pipeline. The residual height of the welding seam is not more than 3mm (the maximum width of the welding joint group to the rear groove).
(4) The wrong edge of the welded joint should not be greater than 10% of the wall thickness and not greater than 2mm.
2. Surface non-destructive testing
The selection principle of the surface non-destructive testing method for straight seam steel pipes: for ferromagnetic material steel pipes, magnetic particle testing should be used; for non-ferromagnetic material steel pipes, penetration testing should be selected.
For welded joints that have a tendency to delay cracks, the surface non-destructive inspection should be performed after the welding is cooled for a certain period of time; for welded joints that have a tendency to reheat cracks, the surface non-destructive inspection should be performed once after welding and after heat treatment.
The application of surface non-destructive testing is carried out in accordance with the requirements of the standard. The detection objects and applications are generally as follows:
(1) The quality inspection of the outer surface of the pipe material.
(2) Detection of surface defects of important butt welds.
(3) Detection of surface defects of important fillet welds.
(4) Detection of surface defects of welding sockets of important socket welding and bridging three-way branch pipes.
(5) Detection of surface defects after pipe bending.
(6) Bevel detection of welded joints with larger material quenching tendency.
(7) Detection of non-austenitic stainless steel pipe grooves whose design temperature is lower than or equal to minus 29 degrees Celsius.
(8) Welding seam of double-side weldment specified rooting inspection after rooting
(9) When oxyacetylene flame is used to cut welding fixtures on alloy pipes that have a tendency to harden, the defects of the repaired parts are detected.
3. Ray detection and ultrasonic detection
The main objects of radiographic testing and ultrasonic testing are butt joints of straight seam steel pipes and butt joints of butt welded pipe fittings.
The selection of non-destructive testing methods shall be in accordance with the design documents. For the detection of welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, the ray detection method should be selected.
For welds with a tendency to delay cracks, the radiographic and ultrasonic tests should be performed after the weld has cooled for a certain period of time.
When the main pipe in the jacket has a girth weld, the weld shall be 100% radiographically inspected, and the concealed operation may be carried out after passing the pressure test.
The welded joints covered by the reinforcing ring or the support pad on the pipeline shall be 100% radiographically inspected, and shall be covered after passing the test.
For the welds required for intermediate inspection of welding, non-destructive testing should be carried out after the appearance inspection is qualified, radiographic and ultrasonic testing should be carried out after the surface non-destructive testing, and the welds that have been inspected can continue to be welded after they are qualified.
horizontal flue pipe--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Before the non-destructive testing of straight seam steel pipes(ERW pipe), the appearance inspection of welds should meet the requirements. The general requirements for the appearance of straight seam steel pipe welds and the surface quality of welded joints are as follows:
The appearance of welding should be well formed, and the width should be 2mm over the edge of the groove on each side. The height of the welding feet of Φ80mm Flue W8-90 fillet welds should meet the design requirements, and the shape should transition gently.
Welded joint surface:
(1) Cracks, unmelted, air holes, slag inclusions and splashes are not allowed.
(2) There should be no undercut on the weld surface of pipes with a design temperature lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to harden. The undercut depth of welding seam of other materials shall be greater than 0.5mm, the length of continuous undercut shall not be greater than 100mm, and the total length of undercut on both sides of the weld shall not be greater than 10% of the total length of the weld.
(3) The surface of the welding seam shall not be lower than the surface of the pipeline. The residual height of the welding seam is not more than 3mm (the maximum width of the welding joint group to the rear groove).
(4) The wrong edge of the welded joint should not be greater than 10% of the wall thickness and not greater than 2mm.
2. Surface non-destructive testing
The selection principle of the surface non-destructive testing method for straight seam steel pipes: for ferromagnetic material steel pipes, magnetic particle testing should be used; for non-ferromagnetic material steel pipes, penetration testing should be selected.
For welded joints that have a tendency to delay cracks, the surface non-destructive inspection should be performed after the welding is cooled for a certain period of time; for welded joints that have a tendency to reheat cracks, the surface non-destructive inspection should be performed once after welding and after heat treatment.
The application of surface non-destructive testing is carried out in accordance with the requirements of the standard. The detection objects and applications are generally as follows:
(1) The quality inspection of the outer surface of the pipe material.
(2) Detection of surface defects of important butt welds.
(3) Detection of surface defects of important fillet welds.
(4) Detection of surface defects of welding sockets of important socket welding and bridging three-way branch pipes.
(5) Detection of surface defects after pipe bending.
(6) Bevel detection of welded joints with larger material quenching tendency.
(7) Detection of non-austenitic stainless steel pipe grooves whose design temperature is lower than or equal to minus 29 degrees Celsius.
(8) Welding seam of double-side weldment specified rooting inspection after rooting
(9) When oxyacetylene flame is used to cut welding fixtures on alloy pipes that have a tendency to harden, the defects of the repaired parts are detected.
3. Ray detection and ultrasonic detection
The main objects of radiographic testing and ultrasonic testing are butt joints of straight seam steel pipes and butt joints of butt welded pipe fittings.
The selection of non-destructive testing methods shall be in accordance with the design documents. For the detection of welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, the ray detection method should be selected.
For welds with a tendency to delay cracks, the radiographic and ultrasonic tests should be performed after the weld has cooled for a certain period of time.
When the main pipe in the jacket has a girth weld, the weld shall be 100% radiographically inspected, and the concealed operation may be carried out after passing the pressure test.
The welded joints covered by the reinforcing ring or the support pad on the pipeline shall be 100% radiographically inspected, and shall be covered after passing the test.
For the welds required for intermediate inspection of welding, non-destructive testing should be carried out after the appearance inspection is qualified, radiographic and ultrasonic testing should be carried out after the surface non-destructive testing, and the welds that have been inspected can continue to be welded after they are qualified.
horizontal flue pipe--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Welded joint surface
2020年9月24日 日常1. Basic requirements for the appearance of ERW straight seam steel pipe welds
Before the non-destructive testing of straight seam steel pipes(ERW pipe), the appearance inspection of welds should meet the requirements. The general requirements for the appearance of straight seam steel pipe welds and the surface quality of welded joints are as follows:
The appearance of welding should be well formed, and the width should be 2mm over the edge of the groove on each side. The height of the welding feet of Φ80mm Flue W8-90 fillet welds should meet the design requirements, and the shape should transition gently.
Welded joint surface:
(1) Cracks, unmelted, air holes, slag inclusions and splashes are not allowed.
(2) There should be no undercut on the weld surface of pipes with a design temperature lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to harden. The undercut depth of welding seam of other materials shall be greater than 0.5mm, the length of continuous undercut shall not be greater than 100mm, and the total length of undercut on both sides of the weld shall not be greater than 10% of the total length of the weld.
(3) The surface of the welding seam shall not be lower than the surface of the pipeline. The residual height of the welding seam is not more than 3mm (the maximum width of the welding joint group to the rear groove).
(4) The wrong edge of the welded joint should not be greater than 10% of the wall thickness and not greater than 2mm.
2. Surface non-destructive testing
The selection principle of the surface non-destructive testing method for straight seam steel pipes: for ferromagnetic material steel pipes, magnetic particle testing should be used; for non-ferromagnetic material steel pipes, penetration testing should be selected.
For welded joints that have a tendency to delay cracks, the surface non-destructive inspection should be performed after the welding is cooled for a certain period of time; for welded joints that have a tendency to reheat cracks, the surface non-destructive inspection should be performed once after welding and after heat treatment.
The application of surface non-destructive testing is carried out in accordance with the requirements of the standard. The detection objects and applications are generally as follows:
(1) The quality inspection of the outer surface of the pipe material.
(2) Detection of surface defects of important butt welds.
(3) Detection of surface defects of important fillet welds.
(4) Detection of surface defects of welding sockets of important socket welding and bridging three-way branch pipes.
(5) Detection of surface defects after pipe bending.
(6) Bevel detection of welded joints with larger material quenching tendency.
(7) Detection of non-austenitic stainless steel pipe grooves whose design temperature is lower than or equal to minus 29 degrees Celsius.
(8) Welding seam of double-side weldment specified rooting inspection after rooting
(9) When oxyacetylene flame is used to cut welding fixtures on alloy pipes that have a tendency to harden, the defects of the repaired parts are detected.
3. Ray detection and ultrasonic detection
The main objects of radiographic testing and ultrasonic testing are butt joints of straight seam steel pipes and butt joints of butt welded pipe fittings.
The selection of non-destructive testing methods shall be in accordance with the design documents. For the detection of welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, the ray detection method should be selected.
For welds with a tendency to delay cracks, the radiographic and ultrasonic tests should be performed after the weld has cooled for a certain period of time.
When the main pipe in the jacket has a girth weld, the weld shall be 100% radiographically inspected, and the concealed operation may be carried out after passing the pressure test.
The welded joints covered by the reinforcing ring or the support pad on the pipeline shall be 100% radiographically inspected, and shall be covered after passing the test.
For the welds required for intermediate inspection of welding, non-destructive testing should be carried out after the appearance inspection is qualified, radiographic and ultrasonic testing should be carried out after the surface non-destructive testing, and the welds that have been inspected can continue to be welded after they are qualified.
horizontal flue pipe--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Before the non-destructive testing of straight seam steel pipes(ERW pipe), the appearance inspection of welds should meet the requirements. The general requirements for the appearance of straight seam steel pipe welds and the surface quality of welded joints are as follows:
The appearance of welding should be well formed, and the width should be 2mm over the edge of the groove on each side. The height of the welding feet of Φ80mm Flue W8-90 fillet welds should meet the design requirements, and the shape should transition gently.
Welded joint surface:
(1) Cracks, unmelted, air holes, slag inclusions and splashes are not allowed.
(2) There should be no undercut on the weld surface of pipes with a design temperature lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to harden. The undercut depth of welding seam of other materials shall be greater than 0.5mm, the length of continuous undercut shall not be greater than 100mm, and the total length of undercut on both sides of the weld shall not be greater than 10% of the total length of the weld.
(3) The surface of the welding seam shall not be lower than the surface of the pipeline. The residual height of the welding seam is not more than 3mm (the maximum width of the welding joint group to the rear groove).
(4) The wrong edge of the welded joint should not be greater than 10% of the wall thickness and not greater than 2mm.
2. Surface non-destructive testing
The selection principle of the surface non-destructive testing method for straight seam steel pipes: for ferromagnetic material steel pipes, magnetic particle testing should be used; for non-ferromagnetic material steel pipes, penetration testing should be selected.
For welded joints that have a tendency to delay cracks, the surface non-destructive inspection should be performed after the welding is cooled for a certain period of time; for welded joints that have a tendency to reheat cracks, the surface non-destructive inspection should be performed once after welding and after heat treatment.
The application of surface non-destructive testing is carried out in accordance with the requirements of the standard. The detection objects and applications are generally as follows:
(1) The quality inspection of the outer surface of the pipe material.
(2) Detection of surface defects of important butt welds.
(3) Detection of surface defects of important fillet welds.
(4) Detection of surface defects of welding sockets of important socket welding and bridging three-way branch pipes.
(5) Detection of surface defects after pipe bending.
(6) Bevel detection of welded joints with larger material quenching tendency.
(7) Detection of non-austenitic stainless steel pipe grooves whose design temperature is lower than or equal to minus 29 degrees Celsius.
(8) Welding seam of double-side weldment specified rooting inspection after rooting
(9) When oxyacetylene flame is used to cut welding fixtures on alloy pipes that have a tendency to harden, the defects of the repaired parts are detected.
3. Ray detection and ultrasonic detection
The main objects of radiographic testing and ultrasonic testing are butt joints of straight seam steel pipes and butt joints of butt welded pipe fittings.
The selection of non-destructive testing methods shall be in accordance with the design documents. For the detection of welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, the ray detection method should be selected.
For welds with a tendency to delay cracks, the radiographic and ultrasonic tests should be performed after the weld has cooled for a certain period of time.
When the main pipe in the jacket has a girth weld, the weld shall be 100% radiographically inspected, and the concealed operation may be carried out after passing the pressure test.
The welded joints covered by the reinforcing ring or the support pad on the pipeline shall be 100% radiographically inspected, and shall be covered after passing the test.
For the welds required for intermediate inspection of welding, non-destructive testing should be carried out after the appearance inspection is qualified, radiographic and ultrasonic testing should be carried out after the surface non-destructive testing, and the welds that have been inspected can continue to be welded after they are qualified.
horizontal flue pipe--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Welded joint surface
2020年9月24日 日常1. Basic requirements for the appearance of ERW straight seam steel pipe welds
Before the non-destructive testing of straight seam steel pipes(ERW pipe), the appearance inspection of welds should meet the requirements. The general requirements for the appearance of straight seam steel pipe welds and the surface quality of welded joints are as follows:
The appearance of welding should be well formed, and the width should be 2mm over the edge of the groove on each side. The height of the welding feet of Φ80mm Flue W8-90 fillet welds should meet the design requirements, and the shape should transition gently.
Welded joint surface:
(1) Cracks, unmelted, air holes, slag inclusions and splashes are not allowed.
(2) There should be no undercut on the weld surface of pipes with a design temperature lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to harden. The undercut depth of welding seam of other materials shall be greater than 0.5mm, the length of continuous undercut shall not be greater than 100mm, and the total length of undercut on both sides of the weld shall not be greater than 10% of the total length of the weld.
(3) The surface of the welding seam shall not be lower than the surface of the pipeline. The residual height of the welding seam is not more than 3mm (the maximum width of the welding joint group to the rear groove).
(4) The wrong edge of the welded joint should not be greater than 10% of the wall thickness and not greater than 2mm.
2. Surface non-destructive testing
The selection principle of the surface non-destructive testing method for straight seam steel pipes: for ferromagnetic material steel pipes, magnetic particle testing should be used; for non-ferromagnetic material steel pipes, penetration testing should be selected.
For welded joints that have a tendency to delay cracks, the surface non-destructive inspection should be performed after the welding is cooled for a certain period of time; for welded joints that have a tendency to reheat cracks, the surface non-destructive inspection should be performed once after welding and after heat treatment.
The application of surface non-destructive testing is carried out in accordance with the requirements of the standard. The detection objects and applications are generally as follows:
(1) The quality inspection of the outer surface of the pipe material.
(2) Detection of surface defects of important butt welds.
(3) Detection of surface defects of important fillet welds.
(4) Detection of surface defects of welding sockets of important socket welding and bridging three-way branch pipes.
(5) Detection of surface defects after pipe bending.
(6) Bevel detection of welded joints with larger material quenching tendency.
(7) Detection of non-austenitic stainless steel pipe grooves whose design temperature is lower than or equal to minus 29 degrees Celsius.
(8) Welding seam of double-side weldment specified rooting inspection after rooting
(9) When oxyacetylene flame is used to cut welding fixtures on alloy pipes that have a tendency to harden, the defects of the repaired parts are detected.
3. Ray detection and ultrasonic detection
The main objects of radiographic testing and ultrasonic testing are butt joints of straight seam steel pipes and butt joints of butt welded pipe fittings.
The selection of non-destructive testing methods shall be in accordance with the design documents. For the detection of welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, the ray detection method should be selected.
For welds with a tendency to delay cracks, the radiographic and ultrasonic tests should be performed after the weld has cooled for a certain period of time.
When the main pipe in the jacket has a girth weld, the weld shall be 100% radiographically inspected, and the concealed operation may be carried out after passing the pressure test.
The welded joints covered by the reinforcing ring or the support pad on the pipeline shall be 100% radiographically inspected, and shall be covered after passing the test.
For the welds required for intermediate inspection of welding, non-destructive testing should be carried out after the appearance inspection is qualified, radiographic and ultrasonic testing should be carried out after the surface non-destructive testing, and the welds that have been inspected can continue to be welded after they are qualified.
horizontal flue pipe--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
Before the non-destructive testing of straight seam steel pipes(ERW pipe), the appearance inspection of welds should meet the requirements. The general requirements for the appearance of straight seam steel pipe welds and the surface quality of welded joints are as follows:
The appearance of welding should be well formed, and the width should be 2mm over the edge of the groove on each side. The height of the welding feet of Φ80mm Flue W8-90 fillet welds should meet the design requirements, and the shape should transition gently.
Welded joint surface:
(1) Cracks, unmelted, air holes, slag inclusions and splashes are not allowed.
(2) There should be no undercut on the weld surface of pipes with a design temperature lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to harden. The undercut depth of welding seam of other materials shall be greater than 0.5mm, the length of continuous undercut shall not be greater than 100mm, and the total length of undercut on both sides of the weld shall not be greater than 10% of the total length of the weld.
(3) The surface of the welding seam shall not be lower than the surface of the pipeline. The residual height of the welding seam is not more than 3mm (the maximum width of the welding joint group to the rear groove).
(4) The wrong edge of the welded joint should not be greater than 10% of the wall thickness and not greater than 2mm.
2. Surface non-destructive testing
The selection principle of the surface non-destructive testing method for straight seam steel pipes: for ferromagnetic material steel pipes, magnetic particle testing should be used; for non-ferromagnetic material steel pipes, penetration testing should be selected.
For welded joints that have a tendency to delay cracks, the surface non-destructive inspection should be performed after the welding is cooled for a certain period of time; for welded joints that have a tendency to reheat cracks, the surface non-destructive inspection should be performed once after welding and after heat treatment.
The application of surface non-destructive testing is carried out in accordance with the requirements of the standard. The detection objects and applications are generally as follows:
(1) The quality inspection of the outer surface of the pipe material.
(2) Detection of surface defects of important butt welds.
(3) Detection of surface defects of important fillet welds.
(4) Detection of surface defects of welding sockets of important socket welding and bridging three-way branch pipes.
(5) Detection of surface defects after pipe bending.
(6) Bevel detection of welded joints with larger material quenching tendency.
(7) Detection of non-austenitic stainless steel pipe grooves whose design temperature is lower than or equal to minus 29 degrees Celsius.
(8) Welding seam of double-side weldment specified rooting inspection after rooting
(9) When oxyacetylene flame is used to cut welding fixtures on alloy pipes that have a tendency to harden, the defects of the repaired parts are detected.
3. Ray detection and ultrasonic detection
The main objects of radiographic testing and ultrasonic testing are butt joints of straight seam steel pipes and butt joints of butt welded pipe fittings.
The selection of non-destructive testing methods shall be in accordance with the design documents. For the detection of welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, the ray detection method should be selected.
For welds with a tendency to delay cracks, the radiographic and ultrasonic tests should be performed after the weld has cooled for a certain period of time.
When the main pipe in the jacket has a girth weld, the weld shall be 100% radiographically inspected, and the concealed operation may be carried out after passing the pressure test.
The welded joints covered by the reinforcing ring or the support pad on the pipeline shall be 100% radiographically inspected, and shall be covered after passing the test.
For the welds required for intermediate inspection of welding, non-destructive testing should be carried out after the appearance inspection is qualified, radiographic and ultrasonic testing should be carried out after the surface non-destructive testing, and the welds that have been inspected can continue to be welded after they are qualified.
horizontal flue pipe--https://www.chinaflue.com/product/%CF%8660100mm-standard-flue-kit/
