Combination type stirring friction welding tool

Abstract

The invention provides a combination-typed mixing friction welding tool. The invention is characterized in that the tool consists of a shaft shoulder and a mixing needle; the shaft shoulder and the mixing needle with different structure design and different material can be exchanged with each other, and a whole welding tool can be formed after assembly. The combination design of the invention can provide greater flexibility for the preparation of the mixing friction welding tool, and provides the possibility for the replacement of the damageable part of the mixing needle. The mixing friction welding tool design of the invention can be applied to the working condition, in which the mixing needles are easy to be broken and abraded.

Description

Technical field: [0001] The invention relates to the welding technology of metal materials, and in particular provides a design of a combined friction stir welding tool. Background technique: [0002] Friction stir welding is a new solid-state welding process invented in 1991 at the British Welding Institute, and its working principle is very simple. A specially designed non-consumable welding tool (consisting of a stirring needle and a shaft shoulder) rotates at high speed to insert the stirring needle between the plates to be joined. When the shaft shoulder contacts the surface of the workpiece, the stirring needle simultaneously moves laterally along the joint. The severe friction between the welding tool and the workpiece leads to a significant increase in the temperature of the welding zone, resulting in plasticization of the material. The role of the stirring pin is to stir the material in the weld area to make it produce plastic rheology and mixing, and the role of t...

AI Technical Summary

Problems solved by technology

When the stirring pin is broken or severely worn, the entire welding tool is scrapped

Second, the integral welding tool can only be made of the same material. When welding materials with high melting point and high hardness, the most demanding stirring needle needs to use high-performance materials with higher cost. Shaft shoulders with less critical forces can only be used with the same material

Third, studies have shown that the geometry of the pin and shoulder has a significant impact on the microstructure and performance of the horn, however for monolithic tool designs, one tool can only provide one tool structure variation

Therefore, no matter from the perspective of raw material and processing costs or from the perspective of research convenience, it is not advisable to adopt an integral design for welding tools

Images