A Correction Process for Butt Welding Bending Deformation of Stainless Steel Small-diameter Thin-walled Pipes
A technology for bending and deforming thin-walled pipes, applied in welding equipment, welding accessories, welding connection methods, etc., can solve the problems of pipe surface scratches, reduced corrosion resistance of pipeline butt girth welds, and large amount of bending deformation. Achieve the effects of avoiding the decline of corrosion resistance, good operation guidance, and overcoming damaged pipelines
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Embodiment 1
[0033] like Figures 1 to 5 Shown is an embodiment of a correction process for butt welding bending deformation of a stainless steel small-diameter thin-walled pipe of the present invention, including the following process steps:
[0034] Step 10. Determination of the curved inner concave part: find out the curved inner concave part at the butt girth weld on the thin-walled pipe, and determine the amount of bending deformation;
[0035] Step 20, filling the back protection gas: filling a sufficient amount of argon gas inside the thin-walled tube to form the back protection of the weld;
[0036] Step 30, argon arc welding without wire filling heating: adopt argon arc welding, and use the arc generated by argon arc welding to heat along a circle of the butt girth weld without filling argon arc welding wire;
[0037] Step 40, water spray cooling: perform partial water spray cooling on the butt girth weld in the area around the curved inner recess on the thin-walled pipe;
[003...
Embodiment 2
[0051] like Figures 1 to 5 As shown, the stainless steel heating coil of 18600 chemical ship is used for the test. The test tubes are φ68x3x250mmx2, welded according to the pipe WPS, and then the simulated on-site calibration test is carried out. Through non-destructive flaw detection test, mechanical test and corrosion test, it is checked whether the performance is satisfied.
[0052] specific plan:
[0053] a) Preparation before welding: Prepare the S316L pipe for testing according to the drawing of the heating coil and the welding process.
[0054] b) Butt fitting: ensure that the pipes are butted in a straight line.
[0055] c) Butt welding: short-arc welding is adopted, and the interlayer temperature should not be lower than the preheating temperature and cannot exceed 100°C (the layer temperature should be measured for each weld seam). The temperature is also measured on the back of the weld, and the temperature is measured on the back of each weld, and the final temp...
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