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How to deal with the distortion of steel structure welders?
Flame correction is a common method to correct the stress and deformation of welded I-beams in steel structures.

Heat the twisted I-beam with oxyacetylene (or oxypropane, etc.). ) gas welding torch, make wrench according to the size of I-beam, and observe it in the dark while heating to dark red for thermal correction.

If I-beams are severely deformed, they can only be scrapped.