Influence of Shielding Gas on Microstructure and Property of Laser Welded Joint of Microalloyed C-Mn Steel

被引：0
|
作者：
Zeng P. [1 ]
Wang X. [1 ]
Zhang S. [1 ]
Zhang M. [2 ]
Chen C. [2 ]
机构：
[1] Shagang School of Iron and Steel, Soochow University, Suzhou, 215021, Jiangsu
[2] School of Mechanical and Electric Engineering, Soochow University, Suzhou, 215021, Jiangsu
来源：
Wang, Xiaonan (wxn@suda.edu.cn) | 1600年 / Science Press卷 / 44期
关键词：
Acicular ferrite; Laser technology; Laser welding; Mechanical property; Shielding gas;
D O I：
10.3788/CJL201744.0402004
中图分类号：
学科分类号：
摘要：
The influence of different shielding gases on microstructure and property of laser welded joint is studied by the weld test of microalloyed C-Mn steel. The results show that, under the same condition of laser weld heat input, full-penetration weld seams can be obtained by three different shielding gases of N2, Ar and air, but the sags in the weld zone shielded by N2 are the most obvious. The microstructures of the weld zone are mainly lath martensite. In the weld seam formed in the air, there are a few acicular ferrites, the number of inclusions is more than that shielded by N2 and Ar, and the ratio of large scale inclusion is relatively high. In all three cases, the mean microhardness and tensile strength of the welded joint are higher than that of the base metal, while the mean microhardness of the weld seam in the air is smaller than that when shielded by N2 or Ar. © 2017, Chinese Lasers Press. All right reserved.
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