Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

被引：13
作者：
Xuan, Yang [1 ]
Yang, Jin [1 ,2 ]
Liu, Hongbing [1 ,2 ]
Deng, Jingyu [3 ]
Wang, Yuhua [3 ]
机构：
[1] Shanghai Univ Engn Sci, Sch Mat Engn, Shanghai, Peoples R China
[2] Shanghai Collaborat Innovat Ctr Laser Adv Mfg Tec, Shanghai, Peoples R China
[3] Shanghai Aircraft Mfg Co Ltd, Commercial Aircraft Corp China, Shanghai, Peoples R China
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2020年 / 25卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Keyhole TIG welding; Invar36; alloy; middle-thick plates; microstructure; mechanical properties; single-pass welding; HYBRID WELDED-JOINT; LASER;
D O I：
10.1080/13621718.2020.1830545
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Single-pass keyhole TIG welding (K-TIG) was used to weld 10-mm-thick Invar36 alloy plates without filler metal and groove preparation. The effects of joint gap, welding current, welding speed and arc length on the weld appearance, microstructure and mechanical properties were investigated. No phase transformation occurred in the weld where only austenite (gamma-(Fe, Ni)) was formed, while the grain structure changed significantly. The maximum tensile strength of K-TIG weld was 440.7 MPa reaching 99.9% of the base metal and the maximum elongation was 31.5%. The microhardness in the weld zone was slightly lower than that of the base metal. The results suggested that K-TIG welding was a very promising method for the joining of middle-thick Invar36 alloy plates.
引用
收藏
页码：712 / 718
页数：7
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