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Indexed by:期刊论文

Date of Publication:2011-04-01

Journal:MATERIALS RESEARCH INNOVATIONS

Included Journals:Scopus、SCIE、EI

Volume:15

Issue:2

Page Number:145-149

ISSN No.:1432-8917

Key Words:Hybrid welding; Shear strength; Mg; Mg(17)Al(12); Mg(2)Ni

Abstract:Microstructures of a laser-tungsten inert gas (TIG) hybrid welding joint of dissimilar Mg alloy and steel with and without Ni interlayer are studied comparatively by SEM. The results show that there are a lot of precipitates of Mg(17)Al(12) with mesh structures in the molten pool of Mg to steel dissimilar joints of laser-TIG hybrid welding without Ni interlayer, leading to the reduction in the mechanical properties of the welded joints. However, the addition of the Ni interlayer improves the microstructures of Mg to steel joints by laser-TIG hybrid welding. The precipitates in the molten pool are mainly composed of Mg(2)Ni and Mg(17)Al(12) in the form of dispersive particles with the size of <5 mu m. The shear strength of Mg to steel joints by laser-TIG hybrid welding with Ni interlayer is higher than that without Ni interlayer.