Whenever possible, changing a continuous weld to a discontinuous weld reduces the plastic deformation of the weld and the workpiece due to heat. Or different welding directions and sequences can be used to make the local weld deformations appropriately reduce or cancel each other, so as to reduce the overall deformation. When the weld is above 1m, the segmental back-welding method, the sub-segment partial stripping method, the jump welding method and the alternate welding method can be used; for the medium length (0.5-1m) weld, the medium-symmetrical welding can be used law.
(1) Subsection back welding method. This method is suitable for welding in various spatial locations, except for vertical welding. Steel is thicker, and the arc shield can be set when the weld is long. Many people weld at the same time. The advantage is that the heat affected zone can be reduced to avoid deformation. Each length should be 0.5~1m.
(5) Central symmetry method. This method is suitable for weldments with short welds. In order to reduce the deformation, it is welded once from the center to the both ends.
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