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Current-carrying friction stir welding method based on adjustable current distribution

A technology of friction stir and welding methods, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as uneven heat distribution and poor weld performance, so as to improve the surface hardness of the weld, increase heat input, The effect of improving the quality of weld seams

Inactive Publication Date: 2018-11-27
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the welding process of the composite heat source, the current density and flow direction lead to uneven heat distribution, and the temperature of the advancing side and the retreating side are different, resulting in poor weld performance

Method used

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  • Current-carrying friction stir welding method based on adjustable current distribution
  • Current-carrying friction stir welding method based on adjustable current distribution

Examples

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Effect test

example 1

[0028] Example 1: Use this stirring head to conduct current-carrying friction stir welding of 6mm thick 2219 aluminum plate. The welding process parameters are as follows: DC power supply is used to provide current, the DC current is 20-400A, the rotation speed of the stirring needle is 500-1000rmp, and the welding speed is 60- 160mm / min. According to the actual welding objects and materials, the welding process parameters are optimized, and the influence of the auxiliary current on the welding heat input and the influence of the auxiliary current on the small welding process parameters are considered. Among them, the fracture position of the welded joint connected to the preheating forward side port of the deflector changes, and the tensile strength increases by 7%.

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Abstract

The invention discloses a current-carrying friction stir welding method based on adjustable current distribution. According to the method, a stir head serves as an electrode of a current auxiliary heat source; under on and off of an external power switch, high-density current flows through a to-be-welded base material through a stir needle, and returns to a power supply unit through a bottom conducting plate, and thus, a hybrid heat-source for friction stir welding is formed by resistance heat and friction stir mechanical heat. During welding, current distribution and flowing direction are adjusted and controlled through the conducting plate according to processing requirements, temperature difference between the advancing side and the retreating side of a weld joint is changed, requirements on weld preheating and post weld heat treatment are met, and mechanical property of the weld joint is improved. Further, plasticity of the material during welding is improved, the temperature fielddistribution of the advancing side and the retreating side of the weld joint during the welding is adjusted, crystal grains are refined, abrasion to the stir needle during the welding is reduced, andweld quality and work efficiency are both improved.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a current-carrying friction stir welding method with adjustable current distribution, which can be applied in aviation, aerospace, military industry, medical treatment, automobile, ocean engineering and other industrial fields. Background technique [0002] Friction stir welding (FSW) is a solid phase connection technology invented by the British Welding Institute in 1991 based on the principle of friction welding technology. The stirring head rotates at high speed and inserts into the weldment, which generates heat by friction with the metal to be welded. The weld metal is softened under the joint action of friction heat and mechanical force through the extrusion of the stirring head to the weld metal, and plasticity occurs with the rotation of the stirring needle. flow to achieve solid phase welding of materials. FSW has the advantages of good welding performance, low residua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
CPCB23K20/1235
Inventor 陈树君张洪玮蒋晓青余旭周媛媛
Owner BEIJING UNIV OF TECH
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