Mechanism of Changes in the Surface Tension of Stainless Steel Arc-Assisted Activating TIG Welding Molten Pool
LIU Zigang1,2, FAN Ding2,*, HUANG Yong2, LIU Yunhua1,3, ZHOU Xiaojing1,3, ZHU Tingting1,3
1 Noblelift Intelligent Equipment Co., Ltd.,Huzhou 313100,Zhejiang, China 2 School of Materials Science and Engineering,Lanzhou University of Technology, Lanzhou 730050, China 3 Engineering Research Center of Intelligent Logistics Equipment of Zhejiang Province,Huzhou 313100,Zhejiang, China
Abstract: For stainless steel arc assisted activating tungsten inert gas welding, this paper used a drop method to test the surface tension of molten pool. In order to keep the high temperature state of molten pool, this paper adopted a quenching device to cooling molten pool rapid, and then cut off quenching surface layer metal and then remelt it. The mechanism of active element to affect the surface tension and temperature coefficient of molten pool was analyzed. The results show that the surface tension temperature coefficient of the molten pool is negative when no O2 is introduced into the auxiliary arc, while with the amount of O2 introduced into the auxiliary arc 1.0 L/min or 1.5 L/min, the surface tension temperature coefficient of the molten pool is positive, and when the amount of O2 introduced reaches 2.0 L/min, the surface tension temperature coefficient of the molten pool becomes negative again. After measuring and analyzing the distribution of oxygen element in the quench bath, it can be concluded that the concentration of oxygen element on the surface of the weld pool leads to the decrease of the surface tension and the change of the surface tension temperature coefficient of motten pool.
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2022, Vol. 36 
