Process Parameters Optimization of Friction Stir Spot Welding of Titanium and Aluminum Based on Response Surface Methodology

Chichao ZHANG; Chongjing YAN; Yan SONG; Zikang SHEN

doi:10.7512/j.issn.1001-2303.2022.02.02

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Process Parameters Optimization of Friction Stir Spot Welding of Titanium and Aluminum Based on Response Surface Methodology
Vol. 52, Issue 2, Pages: 8-16(2022)
Received：26 August 2021，

Revised：2021-11-04，

Published：20 February 2022
DOI： 10.7512/j.issn.1001-2303.2022.02.02
稿件说明：

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张翅超，闫崇京，宋　燕，等.基于响应面法的钛铝异种金属搅拌摩擦点焊工艺参数优化［J］.电焊机，2022，52（2）：8-16. DOI： 10.7512/j.issn.1001-2303.2022.02.02.

ZHANG Chichao, YAN Chongjing, SONG Yan, et al.Process Parameters Optimization of Friction Stir Spot Welding ofTitanium and Aluminum Based on Response Surface Methodology[J].Electric Welding Machine, 2022, 52(2): 8-16. DOI： 10.7512/j.issn.1001-2303.2022.02.02.

摘要

为同时满足减轻质量和降低成本的需求，钛/铝复合结构具有很好的应用前景，但由于钛合金与铝合金之间的物化性能差异巨大，采用传统焊接方式很难形成可靠的连接，而搅拌摩擦点焊技术在连接异种金属方面优势明显，目前针对钛/铝合金的搅拌摩擦点焊研究较少。因此采用回填式搅拌摩擦点焊对2 mm厚的TC4钛合金和6061铝合金进行点焊试验，基于响应面法建立了焊接工艺参数与拉剪断裂载荷的二阶响应模型，结合微观组织和显微硬度进行分析，研究了工艺参数对接头拉剪断裂载荷的影响并通过工艺参数优化预测了点焊接头的拉剪断裂载荷。结果表明，所建立的模型较为准确，预测值与实验值的平均误差约为2.41%，得到的最佳焊接工艺参数为焊具转速1 052.9 r/min，下压量2.19 mm，焊接时间3.01 s。

Abstract

To meet the requirements of weight and cost reduction at the same time

the titanium/aluminum composite structure has a good application prospect

but because of the great physical and chemical performance difference between titanium alloy and aluminum alloy

adopts the traditional welding method is difficult to form a reliable connection

and friction stir spot welding technology has great advantage in connecting dissimilar metals

current research on titanium/aluminium alloy friction stir spot welding is very little. Spot welding experiments were carried out on 2 mm thick TC4 titanium alloy and 6061 aluminum alloy by refill friction stir spot welding. Based on the response surface method

the second-order response model of welding process parameters and tensile-shear fracture load was established

and the effect of process parameters on the joint was studied. The influence of process parameters on the tensile-shear fracture load of joints was studied

and the tensile-shear fracture load of spot joints was predicted through optimization of process parameters. The experimental results show that the response model is very accurate

and the average error between the predicted value and the experimental value is about 2.41%. The best welding process parameters obtained are the welding tool speed 1 052.9 r/min

the plunge depth 2.19 mm

and the welding time 3.01s .

关键词

Keywords

references

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