Steel Surface Texturization Assisted Friction Stir Welding Method for Aluminum-Steel Dissimilar Material Lap Joints

A technology of dissimilar materials and auxiliary stirring, applied in the direction of welding/welding/cutting items, welding equipment, non-electric welding equipment, etc., can solve problems such as low connection strength, embrittlement of connection joints, failure of joints, etc., and achieve reliable strength and smooth seams The shape is beautiful and the effect of automation is realized

Inactive Publication Date: 2016-10-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of joint embrittlement caused by iron-aluminum intermetallic compounds, low joint strength and joint failure caused by excessive difference in thermal expansion coefficient when aluminum-steel dissimilar materials are overlapped, and provides a Steel Surface Texturization Assisted Friction Stir Welding Method for Aluminum-Steel Dissimilar Material Lap Joints

Method used

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  • Steel Surface Texturization Assisted Friction Stir Welding Method for Aluminum-Steel Dissimilar Material Lap Joints
  • Steel Surface Texturization Assisted Friction Stir Welding Method for Aluminum-Steel Dissimilar Material Lap Joints
  • Steel Surface Texturization Assisted Friction Stir Welding Method for Aluminum-Steel Dissimilar Material Lap Joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as Figure 1 ~ Figure 3 As shown, this implementation mode is realized through the following steps:

[0020] Step 1. Clean the contact surface of the aluminum plate 1 and the steel plate 2 to be welded and the surrounding 20mm range, and remove oxides on the surface of the test piece, using an electric wire brush or emery cloth, etc.

[0021] Step 2. Use an organic solvent or cleaning agent to wipe the surfaces of the mechanically treated aluminum plate 1 and steel plate 2 to remove oil and metal dust and other impurities. The organic solvent is alcohol or acetone;

[0022] Step 3. Determine the overlapping area of ​​the joint between the aluminum plate 1 and the steel plate 2, and reach a certain roughness on the part of the steel plate 2 that overlaps with the aluminum plate 1 by roughening, so that the contact surface of the steel plate is evenly distributed with small bumps structure;

[0023] Step 4. The aluminum plate 1 and the steel plate 2 are formed into...

Embodiment 2

[0025] This implementation mode is realized through the following steps:

[0026] Step 1. Clean the contact surface of the aluminum plate and the steel plate to be welded and the surrounding 30mm range, and remove the oxide on the surface of the test piece, using electric wire brush or emery cloth, etc.

[0027] Step 2. Use an organic solvent or cleaning agent to wipe the surface of the mechanically treated aluminum plate and steel plate to remove oil and metal dust and other impurities. The organic solvent is alcohol or acetone, etc.;

[0028] Step 3. Determine the overlapping area of ​​the joint between the aluminum plate and the steel plate, and reach a certain roughness on the part of the steel plate that overlaps the aluminum plate through roughening, so that the contact surface of the steel plate is evenly distributed with fine convex-concave structures;

[0029] Step 4. The aluminum plate and the steel plate are formed into a lap joint with the aluminum plate on the top...

Embodiment 3

[0031] combine figure 2 This embodiment will be described. The texturing methods in this embodiment include laser texturing, electron beam texturing, electric spark texturing and mechanical texturing. Other steps are the same as in the first embodiment.

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Abstract

The invention relates to a steel surface roughing auxiliary stirring friction welding method for aluminum and steel dissimilar material lap connection. A fine convex-concave structure is obtained on the surface of a lap connection position of a steel plate through a roughing method, heat is generated through friction and plastic deformation of a stirring head and an aluminum plate, softened aluminum alloy is combined with the convex-concave structure of the surface of the roughed steel plate, the effective combination area is increased, a brittle intermetallic compound is suppressed from being formed between aluminum and steel, and effective and high-quality lap connection is formed between the steel plate and the aluminum plate. An aluminum steel dissimilar connector with beautiful formed welding joints, a good mechanical property and reliable strength is finally obtained, the welding operation process is simple, the welding cycle is effectively shortened, and automation is achieved easily.

Description

technical field [0001] The invention relates to a friction stir welding method, in particular to a friction stir welding method assisted by surface roughening of aluminum and steel dissimilar materials. Background technique [0002] In recent years, the issue of environmental protection has attracted more and more attention from all over the world. In order to save fuel and protect the environment, the automobile industry has made continuous efforts to reduce the weight of automobiles, so it has put forward higher requirements for automobile materials. Increasing the use of aluminum alloy materials is one of the important measures. Therefore, in the production of the automobile industry, the use of "steel and aluminum" bimetallic welded structures has become the preferred solution for automobile lightweighting, which inevitably involves two materials: aluminum and steel. the connection between. Since the beginning of the 21st century, many domestic and foreign automobile ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12
CPCB23K20/122B23K20/1255B23K20/2275B23K20/24B23K2103/20
Inventor 黄永宪万龙柯熠吕世雄吕宗亮黄体方王耀彬
Owner HARBIN INST OF TECH
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