Study on A-TIG welding of Q245R/321 dissimilar steel

2019 2nd International Conference of Green Buildings and Environmental Management

生态环境科学

Zhang, Rijun^1 ; Wu, Qiyou^2 ; Wang, Lin^1 ; Zeng, Chao^3 ; Wang, Xiangjiang^3

China Nuclear Industry Maintenance CO LTD, Shanghai City

201103, China^1

School of Mechanical Engineering, University of South China, Hengyang City, Hunan Provice

421001, China^2

College of Innovation and Entrepreneurship, University of South China, Hengyang City, Hunan Provice

421001, China^3

关键词: Bending mechanics;    Carbon elements;    Dissimilar steel;    Macroscopic and microscopic;    Research results;    Strength and toughness;    Weld microstructures;    Weld penetrations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/310/4/042011/pdf
DOI  :  10.1088/1755-1315/310/4/042011

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper mainly studies the welding of stainless steel 321 and carbon steel Q245R dissimilar steel. Welding tests of stainless steel 321 and carbon steel Q245R are carried out by A-TIG welding method. The effect of active agent on weld penetration, weld formation and inner hole slag inclusion is studied. The mechanical properties of welded joints is measured by tensile and bending mechanics tests, and the macroscopic and microscopic structures are observed. Furthermore, these tests and research results are compared with conventional TIG welding. The results show that the welding of dissimilar steel with A-TIG welding method is well formed, and there are no pores, cracks and slag inclusion in the weld. The weld microstructure of the two welding methods is mainly austenite and ferrite. In the Q245R side heat affected zone (HAZ), the migration of carbon elements is obvious, but the A-TIG welding joint is superior to the conventional TIG welding in strength and toughness.