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(1) reasonable welding sequence shall be adopted to control deformation according to the following requirements:
1) for groove welding of butt joint, T-joint and cross joint, when the workpiece is allowed or easy to turn over, double-sided groove symmetrical sequence welding shall be adopted; for members with symmetrical section, sequence welding symmetrical to the neutral axis of the member shall be adopted;
2) for the welding of double-sided asymmetric groove, the sequence of welding the part of weld on the deep groove side first, then the shallow groove side, and finally the weld on the deep groove side should be adopted;
3) for long welds, it is better to use the method of sectional back welding or the method of multi person symmetrical welding at the same time;
4) skip welding method should be adopted to avoid local heating concentration of workpiece.
(2) when the joint form, weld arrangement and welding sequence are determined, the welding method with relatively high energy density, such as GMAW or FCAW, should be used, and the smaller heat input should be used.
(3) anti deformation method should be used to control angular deformation.
(4) the general members can be fixed by tack welding while limiting the deformation; for large and thick plate members, the rigid fixation method should be used to increase the rigidity of structural welding.
(5) for large-scale structure, the construction method of sub assembly welding, respectively correcting deformation and then general assembly welding or connection should be adopted.
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