A 304 stainless steel submerged arc welding welding process
A 304 stainless steel, welding process technology, applied in welding equipment, arc welding equipment, welding/welding/cutting items, etc., can solve the problems of excessive welding residual deformation of components, large residual stress and residual deformation, and large thermal expansion coefficient. Achieve the effect of excellent welding process performance, less burning loss and beautiful appearance
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Embodiment 1
[0030] The concrete welding process of the present invention comprises the following steps:
[0031] S1. Clean the welding side. Use oxalic acid to clean both sides of the weld before welding to remove oil and rust and other contaminants;
[0032] S2, back root cleaning, before back welding, use an angle grinder to clean the back of the weld;
[0033] S3. Welding groove selection, using the joint form of plate butt and "I" type welding groove;
[0034] S4, the welding seam is paired, the amount of misalignment shall not be greater than 0.5mm when forming a team, and the welding seam gap is 1mm. The tack welding should be welded as far as possible where the gap is greater than 1mm, or it can be slightly longer (reaching or exceeding 100mm), which can not only ensure that the wrong side will not occur under the condition of large stress during welding, but also ensure that the welding will not occur when the gap is large. burn through. During team formation and tack welding, ...
Embodiment 2
[0039] The second embodiment is basically the same as the first embodiment, except that the welding current of the front welding layer is 390A, the arc voltage is 31V, the welding speed is 500mm / min, the welding current of the back welding layer is 430A, and the arc voltage is 34V, the welding speed is 500mm / min.
Embodiment 3
[0041] The third embodiment is basically the same as the first embodiment, except that the welding current of the front welding layer is 400A, the arc voltage is 32V, the welding speed is 500mm / min, the welding current of the back welding layer is 450A, and the arc voltage is 35V, the welding speed is 500mm / min.
[0042] To sum up, the welding process adopted in the present invention reduces the input of welding heat, and the determined reasonable welding sequence can further reduce the stress during the welding process and the residual stress and residual deformation after welding, and improve the welding strength. Using HO8Cr21Ni10Si stainless steel wire and F308 (HJ260) flux, submerged arc welding of 304 austenitic stainless steel has the characteristics of no increase of C and less burning loss of Si, Cr and Ni elements, excellent welding process performance, easy slag removal, welding Beautifully stitched. The appearance inspection after welding shows that the gauge seam...
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