316奥氏体不锈钢高频感应焊接技术及缺陷形成机理

doi:10.11896/cldb.21020063

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Abstract The high-frequency induction welding technology was used to conduct the welding test on 316 austenitic stainless steel with a wall thickness of 0.3 mm. The influence of welding process on the macro morphology of weld, microstructure and mechanical properties of joint was studied, and the formation mechanism of welding defects was discussed. The results show that when the opening angle is small, the burr is formed by ellipsoid hump defect, and the hump defect decreases with the increase of opening angle. When the welding points are gathered with water stains, welding spatter is prone to occur. When the heat input is 16.5 kJ/m and the welding speed is 80 m/min, the opening angle is 6°, and with the edge of the steel strip dry and clean, the defect-free continuous burr morphology can be obtained. The microstructure of the weld is austenite and δ-ferrite. The average hardness of the weld zone reaches 289HV, and the average tensile strength of the joint is about 920 MPa, which is higher than that of the base metal (760 MPa). The high strength of the weld can be attributed to the extrusion of brittle impurities from the weld by the pressure of the extrusion roller, which improves the bonding ability between grains, and the good formation of the weld, with a result that the grain structure in the weld area is fine, and a large number of δ-ferrites precipitate at the austenite grain boundary hindering the dislocation movement. A flow model of molten metal is proposed to analyze the formation mechanism of hump defects, that is, the opening angle is small during welding, and the equilibrium state inside the molten metal is destroyed with the aggregation of molten metal in a short time to form humps. When the opening angle increases to a suitable one, the welding remains stable and eventually forms a continuous burr.

Key words： stainless austenitic steel high frequency induction welding microstructure welding defect formation mechanism

Published: 10 October 2022 Online: 2022-10-12

CLC number:

TG456.9

Fund:National Natural Science Foundation of China (51771071)

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	Articles by authors
	WANG Chao
	CHEN Qi
	XIAO Shuguang
	DONG Shijie
	XIE Zhixiong
	LUO Ping
	XIE Jianying

Cite this article:

WANG Chao,CHEN Qi,XIAO Shuguang, et al. High Frequency Induction Welding Technology and Defect Formation Mechanism of 316 Austenitic Stainless Steel[J]. Materials Reports, 2022, 36(19): 21020063-5.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21020063 OR http://www.mater-rep.com/EN/Y2022/V36/I19/21020063

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