Friction stirring welding method of weld joint in step structure

Abstract

The invention belongs to the field of metal welding and particularly relates to a friction stirring welding method of a weld joint in a step structure. The friction stirring welding method of the weld joint in the step structure provided by the invention comprises the following steps: reserving process allowance at the step structure; during welding, firstly welding a thick layer in the step structure and welding a thick weld joint; then milling the process allowance, wherein the thick layer is aligned to a thin layer in the step structure; and then welding a thin weld joint from the milled weld joint. According to the method provided by the invention, a process test block is cancelled, the auxiliary materials are reduced, and the time of repairing and matching the process test block is shortened, and meanwhile, the risk of splashing when the process test block is milled is eliminated, and the stability of the welding quality of the weld joint is ensured and the percent of pass of the part and the production efficiency are improved at the same time. Secondarily, the welding step is optimized, the universality of a tool is realized, and the manufacturing cost of the tool is lowered. Compared with the existing welding technology, the method provided by the invention has remarkable technical progress and has relatively huge practical application value.

Description

technical field [0001] The invention belongs to the field of metal welding, and particularly relates to a friction stir welding method for a step structure weld seam. Background technique [0002] When performing friction stir welding of step structure welds in the prior art, a process test piece is added at the step to make the connection between the two thicknesses equal, and the process test piece is in the same state as the part, and the junction between the process test piece and the thick weld is repaired. , First weld the thin weld, then press the repaired two process test pieces to the thin weld, weld the thick weld, and finally remove the process test piece and process allowance. This method firstly causes the gasket to be difficult to be compressed during the welding process due to the limitation of the shape of the parts to be welded, which is easy to cause displacement, which will cause welding defects in light, and the parts will be scrapped and the welding qual...

AI Technical Summary

Problems solved by technology

In this method, firstly, the spacer is not easy to be compressed due to the limitation of the shape of the parts to be welded during the welding process, and it is easy to cause displacement, which may cause welding defects in the slightest, and lead to the scrapping of the parts in severe cases, and the welding quality is unstable; secondly, the process test piece after grinding It needs a good fit with the steps, so the grinding requirements for the gasket are very high. This process takes a long time and the production efficiency is low

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