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Ultrasonic vibration assisted tungsten inert gas welding of dissimilar metals 316L and L415
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-07-13 , DOI: 10.1007/s12613-019-1960-0
Hong-xia Lan , Xiu-fang Gong , Sen-feng Zhang , Liang Wang , Bin Wang , Li-ping Nie

Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316L 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 316L 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% to 31.54%, 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.



中文翻译:

超声振动辅助的316L和L415不同金属的钨极惰性气体保护焊

超声振动辅助钨极惰性气体保护焊被用于连接316L不锈钢和低合金高强度钢L415。系统地研究了超声振动对316L和L415异种金属焊接接头的组织和力学性能的影响。L415和焊缝金属的两个热影响区的组织都得到了细化,传统的钨极惰性气体保护(TIG)焊缝中的δ铁素体团簇通过超声振动改变为分散分布。超声振动促进了元素的均匀分布并降低了焊缝中的微观偏析趋势。通过超声波振动,接头的平均抗拉强度和伸长率分别从613 MPa提高到650 MPa,从16.15%提高到31.54%。

更新日期:2020-07-13
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