Effect of Laser Surface Texturing on Interfacial Microstructure and MeChanical Properties of Laser Welded-Brazed Al/Ti Joint

Caiwang TAN; Zeshui ZHANG; Haoyue LI; Danyang LIN; Bo CHEN; Xiaoguo SONG

doi:10.7512/j.issn.1001-2303.2022.06.09

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Effect of Laser Surface Texturing on Interfacial Microstructure and MeChanical Properties of Laser Welded-Brazed Al/Ti Joint
Vol. 52, Issue 6, Pages: 78-86(2022)
Received：15 March 2022，

Published：30 June 2022
DOI： 10.7512/j.issn.1001-2303.2022.06.09
稿件说明：

移动端阅览

檀财旺，张泽水，李昊岳，等.激光毛化对铝/钛激光熔钎焊界面组织及性能的影响［J］.电焊机，2022，52（6）：78-86. DOI： 10.7512/j.issn.1001-2303.2022.06.09.

TAN Caiwang, ZHANG Zeshui, LI Haoyue, et al.Effect of Laser Surface Texturing on Interfacial Microstructure and MeChanical Properties of Laser Welded-Brazed Al/Ti Joint[J].Electric Welding Machine, 2022, 52(6): 78-86. DOI： 10.7512/j.issn.1001-2303.2022.06.09.

摘要

针对铝/钛接头界面脆性化合物层导致接头性能变差的问题，采用纳秒激光器对钛合金表面进行点阵和直线处理，改变表面微观形貌，并开展6061铝合金和TC4钛合金激光熔钎焊。结果表明，随着点间距的减小，钎料铺展能力显著增强，激光表面毛化处理有效改善了焊缝表面成形，且直线处理的效果弱于点阵处理；毛化处理对于界面化合物的种类影响不大，均为脆性Ti-Al化合物，主要是改变了凹坑处化合物的生长方向和形态；点阵式处理使铝/钛激光焊接接头拉伸载荷提升5%~21%，毛化处理的凹坑很好地阻碍了裂纹的扩展，而直线式处理对铝/钛接头的性能影响不大。指出了下一步的工作重点是如何在毛化处理的前提下提高熔融钎料的润湿效果，在改善接头力学性能的同时保证异种金属的润湿。

Abstract

In order to solve the problem that the brittle compound layer at the interface of the Al/Ti joint leads to the deterioration of joint performance

a nanosecond laser was used to treat the titanium alloy surface with laser surface texturing to change the surface microstructure. Then

laser brazing of 6061 aluminum alloy and TC4 titanium alloy was carried out. The study showed that the laser surface texturing effectively improved the weld surface formation

with a significant increase in brazing spreading ability as the dot density increased

linear processing was weaker than dot matrix processing. The laser texturing had little effect on the types of interfacial compounds

which were brittle Ti Al compounds

and more importantly

it changed the direction of growth and morphology of the compound in the pits. The properties of Al / Ti laser welded joints were improved by 5%~21% after dot matrix processing. The pits of texturing treatment hindered the crack propagation

while the linear processing had little effect on the properties of Al / Ti joints. It is pointed out that the next work focus is how to improve the wetting effect of molten solder on the premise of roughening treatment

so as to improve the mechanical properties of joints and ensure the wetting of dissimilar metals at the same time.

关键词

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