Ultrasonic vibration assisted tungsten inert gas welding of dissimilar metals 316L and L415
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第7期
论文作者：Hong-xia Lan Xiu-fang Gong Sen-feng Zhang Liang Wang Bin Wang Li-ping Nie
文章页码：943 - 953
摘 要：Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316 L and low alloy high strength steel L415. The effect of ultrasonic vibration on the microstructure and mechanical properties of a dissimilar metal welded joint of 316 L and L415 was systematically investigated. The microstructures of both heat affected zones of L415 and weld metal were substantially refined, and the clusters of δ ferrite in traditional tungsten inert gas（TIG） weld were changed to a dispersive distribution via the ultrasonic vibration. The ultrasonic vibration promoted the uniform distribution of elements and decreased the micro-segregation tendency in the weld. With the application of ultrasonic vibration, the average tensile strength and elongation of the joint was improved from 613 to 650 MPa and from 16.15% to31.54%, respectively. The content of Σ3 grain boundaries around the fusion line zone is higher and the distribution is more uniform in the ultrasonic vibration assisted welded joint compared with the traditional one, indicating an excellent weld metal crack resistance.
Hong-xia Lan1，Xiu-fang Gong2，Sen-feng Zhang3，Liang Wang4，Bin Wang1，Li-ping Nie2
1. School of New Energy and Materials, Southwest Petroleum University2. State Key Laboratory of Long-life High Temperature Materials, Dong Fang Turbine Co., Ltd.3. China National Erzhong Group Deyang Wanhang Die Forging Co., Ltd.4. School of Engineering, Southwest Petroleum University
摘 要：Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316 L and low alloy high strength steel L415. The effect of ultrasonic vibration on the microstructure and mechanical properties of a dissimilar metal welded joint of 316 L and L415 was systematically investigated. The microstructures of both heat affected zones of L415 and weld metal were substantially refined, and the clusters of δ ferrite in traditional tungsten inert gas（TIG） weld were changed to a dispersive distribution via the ultrasonic vibration. The ultrasonic vibration promoted the uniform distribution of elements and decreased the micro-segregation tendency in the weld. With the application of ultrasonic vibration, the average tensile strength and elongation of the joint was improved from 613 to 650 MPa and from 16.15% to31.54%, respectively. The content of Σ3 grain boundaries around the fusion line zone is higher and the distribution is more uniform in the ultrasonic vibration assisted welded joint compared with the traditional one, indicating an excellent weld metal crack resistance.
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