Control method for electron beam welding splash of part with narrow lock bottom structure

Abstract

The invention discloses a control method for electron beam welding splash of a part with a narrow lock bottom surface. The control method is characterized in that a welding method with low frequency, small-amplitude triangular wave swing and a low-line energy input welding mode is adopted; high-temperature-resistant rubberized fabric is pasted at a position with a distance of 5mm from a welding seam; formation of the welding splash and a secondary welding seam abated part body is effectively controlled while effective depth of penetration of the welding seam is guaranteed; cleaning before welding is carried out; in an assembly process, the part is prevented from contacting the welding seam, and a gap between the part and the welding seam is not greater than 0.10mm; part welding is carried out as follows: when the pressure value of a vacuum chamber is vacuumized to be 6.7*10<-4> mbar, the part is aligned by adopting a dot drawing method, 8-spot symmetrical positioned welding is carried out on the part, and the part is welded by adopting parameters for qualified welding on a test piece. The control method has the advantages that technical support is provided for the narrow lock bottom design of the part with the special structure, and technical level of electronic beam welding application is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for controlling spatter in electron beam welding of structural parts with narrow bottom locks. Background technique [0002] In the process of electron beam welding, in order to facilitate the assembly of parts, reduce the difficulty of welding tool design, save costs and improve the welding quality of complex parts, welding structures with bottom locks are widely used. As an integral part of some aircraft engine parts with special structures, the bottom lock will form a closed cavity after welding or cannot be machined. In this case, the problem of welding spatter and secondary weld ablation will seriously affect the welding quality and the safety of the engine. At present, in order to effectively control the generation of welding spatter and secondary weld ablation, the welding spatter and secondary weld ablation are usually used bottom lock structure, [0003] In o...

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the weight of the parts, the engine uses the side of the part base as the bottom of the lock, and the length of the bottom of the lock is only 0.5mm. After welding, a semi-closed space is formed. The subsequent cleaning and processing are difficult and prone to omissions. The drop will affect the use of the engine. Although such a design can effectively reduce the weight of the parts, the special design structure makes it difficult for the electron beam welding process

[0004] Parts are limited by the narrow bottom lock structure, large or small welding energy will cause serious welding spatter problems, and along the thin-walled weld, the residual energy of welding often causes secondary weld ablation on the base part , which seriously affects the service life of parts

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