Friction stir welding lap joint tool

Abstract

The invention belongs to the technical field of friction stir welding, and provides a friction stir welding lap joint tool. The friction stir welding lap joint tool is used for lap joint between an upper plate and a lower plate. The friction stir welding lap joint tool comprises a tool body, a clamping handle and a working part. The clamping handle and the tool body are integrated. The clamping handle is connected to one end of the tool body and is fixedly connected with a tool handle of a welding equipment. The working part is integrally connected to the other end of the tool body. The working part comprises a large stirring needle and a small stirring needle. The large stirring needle and the small stirring needle break groove face metal plates, and lap joint is achieved after plastic metal liquidity of the lower plate is improved. The friction stir welding lap joint tool has the advantages that the groove face parent metal is broken by the large stirring needle and the small stirring needle at the same time, and under the simultaneous rotation action of a large shaft shoulder and a small shaft shoulder, the plastic metal of the upper parent metal and the plastic metal of the lower parent metal are driven to flow respectively; and compared with a common friction stir welding tool, according to the friction stir welding lap joint tool, the plastic metal liquidity of the lowerplate can be greatly improved by utilizing the small shaft shoulder, the internal pressure intensity distribution of a weld joint is improved, and then cold lap joint defects and HOOK defects can be avoided.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding and relates to a friction stir welding lap tool. Background technique [0002] In the friction stir welding process of aluminum alloy lap joints, due to insufficient weld metal flow and poor heat transfer between the upper plate and the lower plate, the existing friction stir welding lap tools are prone to HOOK defects and cold during processing. Therefore, it is necessary to improve the existing friction stir welding lap tools. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a friction stir welding lap tool that improves the plastic metal fluidity of the lower plate and eliminates HOOK defects and cold lap defects. [0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a friction stir welding lapping tool, which is used to lap the upper plate and the lower pl...

AI Technical Summary

Problems solved by technology

[0002] In the friction stir welding process of aluminum alloy lap joints, due to insufficient weld metal flow and poor heat transfer between the upper plate and the lower plate, the existing friction stir welding lap tools are prone to HOOK defects and cold during processing. lap defects, so it is necessary to improve the existing friction stir welding lap tools

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