Welding dislocation deformation control method for small-taper-angle thin-wall cylindrical shell

Abstract

The invention provides a welding dislocation deformation control method for a small-taper-angle thin-wall cylindrical shell. According to the method, a roundness adjusting spot-welding tool is used for assembling, a locating method is improved, cylinder flanging is restrained, reasonable welding parameters and a welding sequence are selected, welding deformation is suppressed, and girth welding ofthe small-taper-angle thin-wall shell is realized. The method has the beneficial effects that effective control over welding dislocation deformation of the small-taper-angle thin-wall cylindrical shell is realized, the weld quality reaches the QJ175-93 I-level standard, and the product design index requirement is met.

Description

technical field [0001] The invention belongs to the technical category of welding and manufacturing ultra-high-strength steel pressure-bearing structural parts, and relates to a method for controlling the welding dislocation deformation of a shell. Background technique [0002] In order to meet the light-weight and high-strength design performance requirements of the solid rocket motor, the shell is made of low-alloy high-strength structural steel material as the thin-walled structural parts, and the welding method is automatic argon arc welding or vacuum electron beam welding, and the welding tool is assembled and positioned with the expansion valve inner support To ensure the quality of welding assembly, the external pressure hoop tooling prevents welding dislocation and deformation. Compared with the argon arc welding method, electron beam welding has technological advantages such as concentrated welding energy, heat-affected zone and small deformation, but requires high ...

AI Technical Summary

Problems solved by technology

[0003] The automatic argon arc welding method has lower requirements for assembly before welding, and the welding dislocation and deformation of the weld seam should not be controlled. The process is not easy to control, directly increasing the weld deformation

The use of external pressure hoops to connect positioning spot welding and fixation, tie rod tooling assembly, tungsten electrode automatic argon arc welding method welding process, process cost reduction, and the problem of welding misalignment and deformation has not been effectively controlled

A certain type of cylindrical structural part is a thin-walled cylindrical shell with a small cone angle. A certain batch of welding deformation is large, and the pass rate is less than 60%, which seriously affects and restricts the design and development cycle and manufacturing level of a certain engine. A key process bottleneck technical issue

[0004] According to relevant patents, the welding misalignment of thin-walled cylindrical parts is usually controlled by means of internal support or external pressure by means of welding tooling. Due to differences in part design structures and weld quality requirements, the tooling and control methods used cannot solve the problem of belt smallness. Welding Dislocation Deformation Problems of Tapered Thin-walled Cylindrical Shells

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