CN113263253A - Pipe butt (lap) stirring friction welding process method for continuous pipe - Google Patents

Pipe butt (lap) stirring friction welding process method for continuous pipe Download PDF

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Publication number
CN113263253A
CN113263253A CN202110622213.8A CN202110622213A CN113263253A CN 113263253 A CN113263253 A CN 113263253A CN 202110622213 A CN202110622213 A CN 202110622213A CN 113263253 A CN113263253 A CN 113263253A
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pipe
welding
continuous
wall
lap
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CN113263253B (en
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王洪铎
李霄
肖美霞
路永新
刘彦明
张骁勇
张成文
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Xian Shiyou University
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Xian Shiyou University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/24—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

A pipe butt (lap) friction stir welding process method of a continuous pipe comprises the steps of cutting a damaged part of the continuous pipe, straightening pipe ends at two sides after cutting, removing welding ribs on inner walls of the pipe ends at the two sides, and polishing the inner wall and the outer wall; secondly, turning and polishing the outer wall of the lap joint pipe, and sealing the end of the pipe by using a plastic adhesive tape; inserting the lap joint pipe into the pipe ends at two sides of the continuous pipe to perform butt (lap) welding assembly, punching an inflation hole at the closed position of the assembled butt (lap) joint, filling argon into the lap joint pipe, and performing tack sealing after the lap joint pipe is filled with the argon; then clamping the pipe of the continuous pipe to weld the (lap) friction stir welding system, wherein during welding, a stirring head is inserted from a position 180 degrees away from a tack welding position, the stirring head is inserted to reach a set pressing amount, stops for 3-5s and then rotates around the pipe body to weld and pull out at 365 degrees, and the welding is finished; the invention has low welding heat input, small residual stress and no softening phenomenon of a heat affected zone, and obtains the continuous pipe welding joint with excellent comprehensive performance.

Description

Pipe butt (lap) stirring friction welding process method for continuous pipe
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a pipe butt (lap) joint friction stir welding process method of a continuous pipe.
Background
Coiled Tubing (CT for short, also known as Coiled Tubing, Coiled Tubing or Coiled Tubing) is the fundamental and important component of Coiled Tubing operation technology, which is a jointless steel metal tube of several hundred to several kilometers in length, Coiled on large diameter (typically about 1m or more) reels. The continuous tube is made of fine-grained and ultra-fine-grained structures obtained in specific smelting and rolling processes, and has excellent comprehensive mechanical properties. In other words, the excellent comprehensive mechanical properties of the continuous tube are mainly based on the ultra-fine grain structure. In recent years, the application and function of the continuous pipe and the continuous pipe operation technology composed of the continuous pipe and the operation machine thereof in the fields of oil exploration, well drilling, well washing, oil transportation and the like are prominent along with the development of the oil industry, and the continuous pipe is known as 'universal operation equipment' due to wide application range, convenient use and the like.
In the operation and construction process, the continuous pipe coiled on the winding drum is sent into the underground after traction, straightening, bending steering and straightening again to become a carrier and a working pipe column for conveying an operation medium; after operation, the winding drum moves reversely, the continuous pipe is dragged out from the underground and is wound on the winding drum again, and therefore the continuous pipe can be used repeatedly. The method is characterized in that local damage and failure of a continuous pipe body can be inevitably generated in continuous pipe operation, the local damaged and failed pipe body is removed, and pipe-pipe butt welding of the continuous pipe is carried out on site and is the only method for solving the problem.
However, in nearly twenty years, the butt welding method for the continuous pipes at home and abroad mainly uses TIG (tungsten inert gas) welding, and because TIG welding belongs to fusion welding, the growth of crystal grains in a nugget area can be promoted in the welding process, and the heat influence is softened, so that the performance of a welding joint is greatly reduced. Therefore, a cooling means is adopted during welding to reduce the heat input of a welding seam area and control the grain growth of a nugget area and the softening of a heat affected zone. However, although this measure has a certain effect, the mechanical properties of the joint only reach 70% -80% of the parent material. The results were: in the construction process, due to the influence of heat after welding of the coiled tubing, larger residual stress and severe working conditions in the operation of the coiled tubing, the welded nuclear area or the heat affected area of the coiled tubing is broken from the repaired position in a short time, light persons damage underground equipment, and heavy persons scrap an oil well. Therefore, a welding technique with low heat input, small residual stress, simple process, low cost and excellent comprehensive performance of the joint is urgently needed.
Disclosure of Invention
In order to overcome the defects or shortcomings in the prior art, the invention aims to provide a pipe-to-pipe (lap) friction stir welding process method for a continuous pipe, which realizes pipe-to-pipe (lap) welding of the continuous pipe, and has the advantages of low heat input, small residual stress, simple process, low cost and excellent comprehensive performance of a welding joint.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a pipe-to-pipe (lap) friction stir welding process method of a continuous pipe comprises the following steps:
cutting off the damaged part of the continuous pipe, straightening two pipe ends, and after cutting off the damaged part, performing coarse straightening and fine straightening on the continuous pipe within a range of 600mm away from the two pipe ends to ensure that the straightness of the pipe body reaches 0.5-0.7 per mill, ensuring that the axes of the two pipe bodies are superposed during assembly, and butting the two pipe bodies in a stress-free state;
secondly, removing welding ribs on the inner wall of the continuous pipe, removing rust on the inner wall and the outer wall of the pipe, and flattening pipe ends, wherein the distance between the removing distance of the welding ribs on the inner wall of the continuous pipe and the two pipe ends is 40+ (0.5-1) mm, and the removing distance is up to 0.2-0.5mm from the height of the welding ribs on the peripheral wall surface; then, polishing the inner wall of the tube and making the inner wall flush with the surrounding wall; then, pipe ends are flattened, the plane perpendicular to the axis is taken as a reference for the flattened two pipe ends, the verticality is less than or equal to 0.01mm, and no gap is formed during time synchronization of welding assembly; polishing the outer wall of the continuous tube within 20mm from the tube end by using a grinding head to expose the outer wall with metallic luster;
thirdly, processing the lapping pipe, wherein the lapping pipe is identical to the continuous pipe in quality and 80-1mm in length, the outer wall of the lapping pipe is turned by a lathe to be 0.01-0.05mm smaller than the inner diameter of the continuous pipe, the wall thickness of the lapping pipe is 1.5-2.5mm, and the outer diameter precision of the lapping pipe is ensured to smoothly penetrate into the continuous pipe and be in transition fit with the inner wall of the continuous pipe; in addition, the inner walls of the two pipe ends of the lap pipe are chamfered, and the two pipe ends are sealed;
fourthly, assembling the two ends of the continuous pipe which is ready for butt joint, placing the two ends of the continuous pipe on a butt joint assembly welding device for standby, marking the middle position on the lapping pipe, firstly inserting the lapping pipe into one end of the continuous pipe, and stopping inserting when the lapping pipe is inserted to the mark position of 40mm +/-5 mm of the middle position and meets the resistance of a welding rib in the continuous pipe; then inserting the rest part of the lap joint pipe into the other end of the continuous pipe until the two pipe ends of the continuous pipe are sealed to form a lap joint, and finally clamping the continuous pipe inserted into the lap joint pipe on a butt-joint assembly welding device in a stress-free state;
fifthly, processing an inflation hole, namely drilling a straight hole on the outer wall of the butt joint (lap joint) of the continuous pipe to ensure that the hole penetrates through the pipe wall on one side of the lap joint pipe, and then reaming to ensure that the hole is conical;
sixthly, filling protective gas in the tube, performing tack welding, and filling argon with the quality purity not less than 99.9% into the tube through the gas filling hole;
seventhly, clamping the welding machine at the welding port of the continuous pipe body, enabling the stirring head to be opposite to the end-to-end (lap) joint of the continuous pipe body and form an angle of 85-89 degrees with the tangent line of the pipe body, and enabling the welding start position of the stirring head to be 180 degrees with the spot welding position;
(eighth) setting welding parameters, wherein the walking speed of the stirring head is 23.5-60mm/min, the rotating speed is 300-600rpm, the reduction is the height of a shaft shoulder convex area of the stirring head, argon is introduced during friction stir welding, and the flow rate is 5-7L/min;
ninth, starting a friction stir welding machine, inserting a stirring head from a welding starting position, walking and welding around the outer wall of the continuous pipe after reaching a set reduction and staying for 3-5s, synchronously introducing argon gas during welding, moving an argon gas introducing device along with the stirring head, pulling out the stirring head after walking and welding for at least 365 degrees, then fixing the pulled-out conical stirring pin hole by using argon arc welding, and finishing welding, thereby realizing the pipe friction stir welding (lap welding) of the continuous pipe;
(ten) after welding, taking down the friction stir welding machine, and grinding welding bead flash and burrs;
and (eleventh) inspecting after welding, detecting whether the surface and the inside of the welding seam have cracks and cavity defects, and if the defects are not detected, indicating that the welding seam is perfect.
The stirring head is divided into three parts, including a clamping part, a shaft shoulder and a stirring pin, wherein the clamping part is cylindrical; a shaft shoulder is arranged above the clamping part and is in a convex step shape, and the convex inclination angle is 12-15 degrees; the upper part of the shaft shoulder is provided with a stirring pin which is in a frustum shape.
The diameter of the clamping part is 18 mm; the diameter of the shaft shoulder is 20mm, the frustum of the stirring needle is a left-handed trapezoidal thread, the chamfer of a tooth-shaped angle is a fillet with a radius of 2mm, the inclination angle of the frustum is 46-48 degrees, the diameter of the root of the frustum is 5-8mm, the diameter of the end part is 3-5mm, the length of the frustum is 3.5-6.5mm, and the length of the frustum is equal to or less than the sum of the wall thickness of the continuous pipe and the wall thickness of the lap pipe.
The invention has the beneficial effects that: the method of the present invention is suitable for continuous pipe with pipe diameter of 25.4-70.03mm (1.0-2.75in), wall thickness of 2.18-5.08mm (0.087-0.20in), yield strength sigmasThe continuous pipe joint is a continuous steel pipe with 483-621Mpa (70-90Kpsi), the butt (lap) friction stir welding of the continuous pipe is realized, the heat input is reduced, the residual stress of the joint is reduced, the softening phenomenon of a heat affected zone disappears, and the continuous pipe joint with excellent comprehensive performance is obtained.
Drawings
Fig. 1 is a schematic view of the continuous pipe butt (lap) assembly of the present invention.
Fig. 2 is a schematic view of a stirring head of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, a tube-to-tube (lap) friction stir welding process method of a continuous tube comprises the following steps:
cutting off the damaged part of the continuous pipe, straightening two pipe ends, after cutting off the damaged part, performing rough correction and fine correction on the continuous pipe within the range of 600mm from the two pipe ends to ensure that the straightness of the pipe body reaches 0.5-0.7 thousandth, ensuring that the axes of the two pipe bodies are superposed during assembly, and butting the two pipe bodies in a stress-free state.
And (II) removing welding ribs on the inner wall of the continuous pipe, removing rust on the inner wall and the outer wall of the pipe, and flattening the pipe ends, wherein the welding ribs on the inner wall of the continuous pipe are removed by adopting a device for removing welding burrs on the inner wall of the continuous pipe with the patent number of CN204277684U, the distance between the removal distance and the two pipe ends is 40+ (0.5-1) mm, and the removal distance is 0.2-0.5mm from the height of the peripheral wall surface. Then, the inner wall of the tube was polished to be flush with the surrounding wall surface by a 120-mesh Buckbrown corundum cylindrical grinding head. And then, a 0-degree plane blade is installed by adopting an ISY-80 internal expanding beveling machine to flatten the pipe end, the plane perpendicular to the axis is taken as a reference for the flattened two pipe ends, the verticality is less than or equal to 0.01mm, and no gap is ensured during welding and time synchronization. And moreover, a cloth-based brown corundum cylindrical grinding head with the granularity of 120 meshes is adopted to polish the outer wall of the continuous tube within the range of 20mm away from the tube end, so that the outer wall is exposed with metallic luster.
Thirdly, processing the lapping pipe, wherein the lapping pipe is identical to the continuous pipe in quality and 80-1mm in length, the outer wall of the lapping pipe is turned by a lathe to be 0.01-0.05mm smaller than the inner diameter of the continuous pipe, the wall thickness of the lapping pipe is 1.5-2.5mm, and the outer diameter precision of the lapping pipe is ensured to smoothly penetrate into the continuous pipe and be in transition fit with the inner wall of the continuous pipe; in addition, the inner walls of the two pipe ends of the lap joint pipe are chamfered at an angle of 37 degrees by adopting a device for removing welding burrs on the inner wall of a continuous pipe of patent No. CN204277684U in the second patent, and the two pipe ends are sealed by using plastic adhesive tapes. The purpose of chamfering is to make the oil-water mixture and impurities smoothly flow through the lap joint pipe; the purpose of sealing the two pipe ends by the adhesive tape is to prevent the introduced protective argon from flowing away before welding, and the sealing adhesive tape can be broken through by a post-welding hydraulic pressure experiment and flows out along with the pressurized water. The lapping pipe is used as a backing material of the continuous pipe body, so that the lapping pipe is overlapped with the continuous pipe body during welding, and can effectively support the welding pressure load; and secondly, the contact area of the welded continuous tube body and the overlapped section of the lap joint tube is large, the residual stress is small, the strength is high, and the continuous tube is not easy to break from the welding position when being coiled.
And (IV) assembling the two pipe ends of the coiled tubing ready for aligning on a field coiled tubing aligning assembly welding device of patent No. CN203343687U for standby. Marking the middle position on the lapping pipe, firstly inserting the lapping pipe into one end of the continuous pipe, and stopping inserting when the mark part inserted to about 40mm of the middle position meets the resistance of the welding rib in the continuous pipe. And then inserting the rest part of the lap joint pipe into the other end of the continuous pipe until the two pipe ends of the continuous pipe are sealed to form a lap joint. And finally clamping the continuous pipe inserted into the overlap joint pipe on the butt-joint assembly welding device in an unstressed state.
(V) aerify spot facing work, utilize the electric drill, the drill bit diameter is 3mm, makes a straight hole on the coiled tubing is to (overlap) seam outer wall, makes the hole pierce through overlap joint pipe one side pipe wall, then uses 6mm drill bit reaming for the hole is conical, and the purpose in the hole of the taper of enlargement hole is to guarantee to weld when follow-up tack welding and is passed through.
And (VI) filling protective gas into the tube and tack welding, wherein argon with the quality purity not less than 99.9% is filled into the tube from the gas filling hole, and the argon filling is used for preventing the back of the welding line from being oxidized during welding. After the overlap joint pipe is filled with argon gas, the argon arc welding method is adopted to tack the blocked inflation hole quickly, so that the argon gas is sealed in the pipe by tack welding, and the phenomenon that the overlap joint pipe and the continuous pipe move to influence the welding quality during friction stir welding can be prevented.
The friction stir welding is characterized in that a stirring pin rotating at a high speed is inserted into a joint of a welding plate until a shaft shoulder is in close contact with a material to be welded, the material is softened under the action of friction heat, and the material at the joint is enabled to generate plastic flow under the stirring action of the stirring pin, so that solid connection between the materials is realized. The method effectively avoids the structural defects brought by the traditional fusion welding technology because the welding heat input is low and the weld metal is not melted, and can obviously improve the comprehensive performance of the joint due to the refinement, homogenization and densification of the microstructure in the welding process.
And (seventhly) clamping the friction stir welding machine at the welding port of the continuous pipe body, so that the stirring head is opposite to the end-to-end (lap) joint of the continuous pipe body and forms 88-89 degrees with the tangent line of the pipe body, and the starting welding position of the stirring head and the tack welding position form 180 degrees.
Referring to fig. 2, the stirring head is divided into three parts, including a clamping part, a shaft shoulder and a stirring pin, wherein the clamping part is cylindrical and has a diameter of 18 mm; the shaft shoulder is in a convex step shape, the diameter of the shaft shoulder is 20mm, and the convex inclination angle is 12-15 degrees; the stirring pin is in a frustum shape, the frustum is a left-handed trapezoidal thread, a tooth-shaped angle is a fillet with a chamfering radius of 2mm, the inclination angle of the frustum is 46-48 degrees, the diameter of the root of the frustum is 5-8mm, the diameter of the end part is 3-5mm, the length of the frustum is 3.5-6.5mm, and the length of the frustum is equal to or less than the sum of the wall thickness of the continuous pipe and the wall thickness of the lap pipe. The convex step-shaped shaft shoulder is easy to be attached to the pipe fitting and enables metal on the surface of the pipe fitting to be easy to generate plastic deformation; the left-handed trapezoidal thread of the frustum-shaped stirring pin can enhance the stirring effect of the weld metal and prevent the stirring pin from being bonded easily.
(eighth) setting welding parameters, wherein the walking speed of the stirring head is 23.5-60mm/min, the rotating speed is 300-600rpm, the reduction is about 0.1-0.2mm of the height of the shaft shoulder convex area of the stirring head, and argon is introduced during friction stir welding at the flow rate of 5-7L/min.
And (nine) welding, starting a friction stir welding machine, inserting a stirring head from a welding starting position, reaching a set reduction and staying for 3-5s, then walking and welding around the outer wall of the continuous tube, synchronously introducing argon gas during welding, moving the argon gas introducing device along with the stirring head, pulling out the stirring head after walking and welding for 365 degrees, then immediately fixing the pulled conical stirring pin hole by adopting argon arc welding, and finishing welding, thereby realizing the friction stir welding (lap welding) of the tube and the tube of the continuous tube.
(ten) after the welding is finished, taking down the friction stir welding machine, and grinding welding bead flash and burrs by using a 100-mesh angle grinding sheet;
and (eleventh) inspecting after welding, and detecting whether the surface and the inside of the welding seam have defects such as cracks, cavities and the like by adopting an appearance inspection method, a magnetic powder inspection method and a water pressure inspection method, wherein if the defects are not detected, the welding seam is perfect.
The friction stir butt (lap) welding of the continuous pipe is completed by using a pipe butt (lap) friction stir welding system consisting of a self-made friction stir welding machine and a clamping mechanism thereof. During welding, argon is used as shielding gas, and the stirring head can rotate around the pipe wall. The welding method has the advantages that metal is not melted during welding, heat input is low, residual stress is small, and the softening phenomenon of a welding heat affected zone disappears, so that a high-quality welding seam is obtained. In addition, the welding method makes the material generate plastic deformation by the automatic rotation of the stirring head, does not use filling materials, and has high automation degree, low cost and ideal welding effect.
Example one
The dimension specification and grade of the continuous tube suitable for the embodiment are 25.4mm (1.0in) of tube diameter, 2.18mm of wall thickness and QT800 grade ultra-fine grain steel continuous tube, and the tensile strength sigma isbNot less than 621MPa, and elongation of 22.0%. According to the process method, friction stir butt (lap) welding is adopted, the welding parameters are rotation speed 475rpm, walking speed 23.5mm/min, rolling reduction 0.1mm, stirring head shaft shoulder type inclination angle 12 degrees, frustum inclination angle 46 degrees, frustum root diameter 6mm, end diameter 3.5mm, frustum length 3.6mm, and the tangent of the stirring head and the continuous pipe body is 89 degrees, so that a defect-free joint is obtained, and the joint mechanical property test result is as follows:
and (3) tensile test: after the tensile test is carried out according to the ASTM-E8 standard, the joint fracture is positioned in the parent metal area, and the tensile strength and the elongation are improved and are respectively 628MPa and 25.3 percent.
Bending test: the bending test of the welded joint is carried out according to the (GB/T2653-1989) standard, the bending span is 25mm, the U-shaped cold bending is carried out at 180 degrees, and no crack is found in the welded joint after the bending.
Example two
The size specification and grade of the continuous tube suitable for the embodiment are 44.45mm (1.75in) of tube diameter, 3.18mm of wall thickness, QT900 grade ultra-fine grain steel continuous tube and tensile strength sigmabNot less than 715MPa, according to the process method of the invention, friction stir butt (lap) welding is adopted, the welding parameters are rotation speed of 600rpm, walking speed of 47.5mm/min, rolling reduction of 0.18mm, the axial shoulder convex inclination angle of the stirring head of 13 degrees, the inclination angle of the frustum of cone of 46 degrees, the diameter of the root of the cone of 6mm, the diameter of the end part of 3.5mm, the length of the cone of 4.6mm, and the tangent of the stirring head and the continuous pipe body is 88 degrees.
The welded QT 900-grade continuous pipe weld joint of the embodiment is subjected to appearance inspection, the surface forming is good, and no obvious defect exists; carrying out penetration flaw detection nondestructive inspection on the welding joint according to the GB/T5097-2005 inspection standard, wherein the result meets the standard; water pressure inspection: no penetration, and qualified welding seam quality.

Claims (3)

1. A pipe-to-pipe (lapping) friction stir welding process method of a continuous pipe is characterized by comprising the following steps:
cutting off the damaged part of the continuous pipe, straightening two pipe ends, and after cutting off the damaged part, performing coarse straightening and fine straightening on the continuous pipe within a range of 600mm away from the two pipe ends to ensure that the straightness of the pipe body reaches 0.5-0.7 per mill, ensuring that the axes of the two pipe bodies are superposed during assembly, and butting the two pipe bodies in a stress-free state;
secondly, removing welding ribs on the inner wall of the continuous pipe, removing rust on the inner wall and the outer wall of the pipe, and flattening pipe ends, wherein the distance between the removing distance of the welding ribs on the inner wall of the continuous pipe and the two pipe ends is 40+ (0.5-1) mm, and the removing distance is up to 0.2-0.5mm from the height of the welding ribs on the peripheral wall surface; then, polishing the inner wall of the tube and making the inner wall flush with the surrounding wall; then, pipe ends are flattened, the plane perpendicular to the axis is taken as a reference for the flattened two pipe ends, the verticality is less than or equal to 0.01mm, and no gap is formed during time synchronization of welding assembly; polishing the outer wall of the continuous tube within 20mm from the tube end by using a grinding head to expose the outer wall with metallic luster;
thirdly, processing the lapping pipe, wherein the lapping pipe is identical to the continuous pipe in quality and 80-1mm in length, the outer wall of the lapping pipe is turned by a lathe to be 0.01-0.05mm smaller than the inner diameter of the continuous pipe, the wall thickness of the lapping pipe is 1.5-2.5mm, and the outer diameter precision of the lapping pipe is ensured to smoothly penetrate into the continuous pipe and be in transition fit with the inner wall of the continuous pipe; in addition, the inner walls of the two pipe ends of the lap pipe are chamfered, and the two pipe ends are sealed;
fourthly, assembling the two ends of the continuous pipe which is ready for butt joint, placing the two ends of the continuous pipe on a butt joint assembly welding device for standby, marking the middle position on the lapping pipe, firstly inserting the lapping pipe into one end of the continuous pipe, and stopping inserting when the lapping pipe is inserted to the mark position of 40mm +/-5 mm of the middle position and meets the resistance of a welding rib in the continuous pipe; then inserting the rest part of the lap joint pipe into the other end of the continuous pipe until the two pipe ends of the continuous pipe are sealed to form a lap joint, and finally clamping the continuous pipe inserted into the lap joint pipe on a butt-joint assembly welding device in a stress-free state;
fifthly, processing an inflation hole, namely drilling a straight hole on the outer wall of the butt joint (lap joint) of the continuous pipe to ensure that the hole penetrates through the pipe wall on one side of the lap joint pipe, and then reaming to ensure that the hole is conical;
sixthly, filling protective gas in the tube, performing tack welding, and filling argon with the quality purity not less than 99.9% into the tube through the gas filling hole;
seventhly, clamping the welding machine at the welding port of the continuous pipe body, enabling the stirring head to be opposite to the end-to-end (lap) joint of the continuous pipe body and form an angle of 85-89 degrees with the tangent line of the pipe body, and enabling the welding start position of the stirring head to be 180 degrees with the spot welding position;
(eighth) setting welding parameters, wherein the walking speed of the stirring head is 23.5-60mm/min, the rotating speed is 300-600rpm, the reduction is the height of a shaft shoulder convex area of the stirring head, argon is introduced during friction stir welding, and the flow rate is 5-7L/min;
ninth, welding, namely starting a friction stir welding machine, inserting a stirring head from a welding starting position, reaching a set reduction and staying for 3-5s, then walking and welding around the outer wall of the continuous pipe, synchronously introducing argon gas during welding, moving an argon gas introducing device along with the stirring head, pulling out the stirring head after walking and welding for at least 365 degrees, then fixing the pulled-out conical stirring pin hole by using argon arc welding, and finishing welding, thereby realizing the friction stir welding (lap welding) of the pipe and the pipe of the continuous pipe;
(ten) after welding, taking down the friction stir welding machine, and grinding welding bead flash and burrs;
and (eleventh) inspecting after welding, detecting whether the surface and the inside of the welding seam have cracks and cavity defects, and if the defects are not detected, indicating that the welding seam is perfect.
2. The tube butt (overlap) friction stir welding process of a continuous tube according to claim 1, wherein the stirring head is divided into three parts including a clamping part, a shaft shoulder and a stirring pin, and the clamping part is cylindrical; a shaft shoulder is arranged above the clamping part and is in a convex step shape, and the convex inclination angle is 12-15 degrees; the upper part of the shaft shoulder is provided with a stirring pin which is in a frustum shape.
3. The paired (overlapping) friction stir welding process of a continuous tube according to claim 2, wherein said clamping portion has a diameter of 18 mm; the diameter of the shaft shoulder is 20mm, the frustum of the stirring needle is a left-handed trapezoidal thread, the chamfer of a tooth-shaped angle is a fillet with a radius of 2mm, the inclination angle of the frustum is 46-48 degrees, the diameter of the root of the frustum is 5-8mm, the diameter of the end part is 3-5mm, the length of the frustum is 3.5-6.5mm, and the length of the frustum is equal to or less than the sum of the wall thickness of the continuous pipe and the wall thickness of the lap pipe.
CN202110622213.8A 2021-06-03 2021-06-03 Pipe butt-joint friction stir welding process method for coiled pipe Active CN113263253B (en)

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CN114850651B (en) * 2022-06-02 2023-09-12 太仓阿尔法数字科技有限公司 In-service pipeline welding repair method and device

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