Combination type stirring friction welding tool

A welding tool and friction stir technology, applied in the field of combined friction stir welding tool design, can solve the problems of undesired integral design, scrapped welding tools and high cost

Inactive Publication Date: 2008-07-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Combination type stirring friction welding tool

Examples

Experimental program
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Effect test

Embodiment 1

[0023] High-speed steel is used as the tool material, and the shaft shoulder and stirring pin part of the welding tool are respectively processed by turning, milling, drilling and other machining processes, and are heat-treated to a HRC hardness of ~60 for fine grinding and forming. The shaft shoulder and the stirring needle are combined through a precise sliding assembly, and the assembly tolerance is 0.01mm. The precise positioning and fastening of the stirring needle is realized through the design of the boss inside the shaft shoulder and the fastening screw. Such a combined welding tool can be widely used for welding aluminum, magnesium, copper alloys and composite materials thereof. When the stirring needle is broken or severely worn, take out the damaged stirring needle and replace it with a new stirring needle to restore the use function of the welding tool.

Embodiment 2

[0027] High-speed steel and high-temperature alloy are used as raw materials, and high-speed steel shoulders and high-temperature alloy stirring pins are processed by machining processes such as turning, milling, and drilling. Carry out fine grinding and shaping. The assembly of the shaft shoulder and the stirring needle is realized by threads, and the positioning and fastening of the stirring needle are realized by screws. Such combined welding tools are mainly used for welding copper alloys and other high melting point metal materials. When the high-temperature alloy stirring needle is broken or severely worn, take out the damaged stirring needle and replace it with a new stirring needle to restore the use function of the welding tool.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 马宗义冯艾寒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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