Cui Shuwan, Yu Yunhe, Tian Fuyuan, Pang Shuwen
School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.
Materials (Basel). 2022 Aug 7;15(15):5432. doi: 10.3390/ma15155432.
In this paper, the S32101 duplex stainless steel welded joints were produced by a K-TIG welding system. The weld geometry parameters under different welding speeds were analyzed by combining the morphological characteristics of the keyhole. The microstructure and impact toughness of the base metal and weld metal zone under different welding speeds were studied. The experiment results show that the welding speed has quite an effect on the geometry profile of the weld. In addition, the characteristic parameters of the keyhole can effectively predict the geometry profile of the weld. The test results prove that the microstructure, Σ3 coincidence site lattice grain boundary, and phase boundary of ferrite and austenite have an effect on the impact property of the weld metal zone. When the proportion of the austenite, Σ3 coincidence site lattice grain boundary and random phase boundary increased, the impact property of the weld metal zone also increased.
本文采用K-TIG焊接系统制备了S32101双相不锈钢焊接接头。结合小孔的形态特征，分析了不同焊接速度下的焊缝几何参数。研究了不同焊接速度下母材和焊缝金属区的微观组织及冲击韧性。实验结果表明，焊接速度对焊缝的几何形状有较大影响。此外，小孔的特征参数能够有效预测焊缝的几何形状。试验结果证明，铁素体与奥氏体的微观组织、Σ3重合位置点阵晶界和相界对焊缝金属区的冲击性能有影响。当奥氏体、Σ3重合位置点阵晶界和随机相界的比例增加时，焊缝金属区的冲击性能也会提高。
