One-side welding and double-side forming method for T-shaped joint of closed supporting structure

Abstract

Provided is a one-side welding and double-side forming method for a T-shaped connector of a closed supporting structure; a welding groove of the closed supporting structure is processed, the closed supporting structure and a bottom plate are assembled, and a gap is formed between the welding groove of the closed supporting structure and the bottom plate; and a closed annular welding area between the closed supporting structure and the bottom plate is welded by adopting a welding mode of combining symmetrical welding and leapfrogging welding and a welding method of manual electric arc welding. The groove form and size of the closed supporting structure are reasonably designed, the truncated edge thickness heat dissipation condition of an adopted V-shaped groove form is superior to that of a U-shaped groove, weld penetration can be effectively prevented, the assembly clearance is controlled, the welding process is optimized, the assembly precision requirement and misalignment sensitivity can be reduced, one-side welding and double-side forming of the T-shaped joint are effectively achieved, the back of a root is ensured to be fully fused, and meanwhile, the defects of root penetration or undercut and the like are avoided.

Description

technical field [0001] The invention relates to a method for one-side welding and double-side forming of a T-shaped joint of a closed support structure. Background technique [0002] In the field of pressure vessels, for example, there are some T-joints in the support structure of nuclear power main equipment. Due to structural closure and other reasons, the T-joints cannot be cleaned after welding, so it is necessary to realize single-sided welding and double-sided molding. In order to achieve single-sided welding and double-sided forming at the root of the weld and ensure the penetration quality of the root of the weld, the assembly accuracy must be controlled, such as the amount of misalignment and the assembly gap. Some T-joint bevel forms in existing supporting structures are as follows: figure 1 As shown, the welding method including the groove of the upper plate and the groove of the bottom plate is argon tungsten arc welding, but the requirements for assembly accura...

AI Technical Summary

Problems solved by technology

Some T-joint bevel forms in existing supporting structures are as follows: figure 1 As shown, the welding method including the groove of the upper plate and the groove of the bottom plate is argon tungsten arc welding, but the requirements for assembly accuracy are relatively high, especially the misalignment between the groove of the upper plate and the groove of the bottom plate needs to be controlled Within 2mm, and as figure 2 Some of the supporting structures shown (such as supporting rings) are formed by coiled plates, and there are some deviations in their ellipticity, and the amount of misalignment cannot be accurately controlled during assembly. cannot be guaranteed

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