Friction Spot Welding Tool and Method for Material Continuous Inheritance Filling

Abstract

The invention relates to a material continuous filling friction spot welding tool and method. The friction spot welding tool comprises a pressing sleeve, a hollow backfilling inner sleeve and a central shaft which are sequentially nested from outside to inside; the central shaft comprises a body and a welding part, and the welding part It is fixed to one end of the body; the body is a cylinder, and the outer diameter of the body matches the inner diameter of the hollow backfill inner collar; the area of ​​the cross section of the welding part is smaller than the area of ​​the cross section of the body, and the outer side wall of the welding part is the same as the A cavity capable of accommodating a continuous succession filling material is formed between the inner side walls of the hollow backfill inner collar. The material of the invention continuously inherits and fills the friction spot welding tool and method, and solves the weak connection of the vertical interface of the welding point in the ring pressing method of the traditional backfilling friction spot welding technology, the large pressing resistance of the central axis pressing method, and the welding Problems such as poor consistency of mechanical properties and insufficient reliability of solder joints caused by poor point backfill formation.

Description

technical field [0001] The invention relates to lap spot welding technology, in particular to a material continuous inheritance filling friction spot welding tool and method. Background technique [0002] In aerospace, automobile, rail transit and other fields, aluminum alloy structures are more and more widely used due to lightweight requirements, and aluminum alloy point connection structures, as an important light-weight and high-strength structure, have attracted widespread attention. Conventional joining methods for such structures include welding, mechanical joining, and the like. Welding is an ideal connection method for such structures due to its higher connection strength, better corrosion resistance, simple process and structural weight reduction performance. However, in the traditional resistance spot welding method, due to the existence of an oxide film on the surface of aluminum alloy and the characteristics of high thermal conductivity and high electrical cond...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a material continuous inheritance filling friction spot welding tool and method to solve the problems of poor mechanical performance consistency and insufficient reliability of the solder joints caused by the weak connection of the vertical interface of the solder joints in the traditional backfill friction spot welding technology

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