Control of Defects in Mg Alloy Arc Additive Repair Layer by Friction Stir Treatment

doi:10.3901/JME.2022.04.055

Abstract

Abstract: Magnesium alloy arc additive has fast thermal conductivity and irregular crystallization in the process of cold metal transition welding (CMT) arc additive, and easily forms obvious holes at weld seam joints and rough surfaces of the formed parts. The research on defect control of repair layer is of great significance to the development and practical application of magnesium alloy additive manufacturing repair. The research results show that CMT rapid additive remanufacturing of magnesium alloy has realized lap joint of multi-passes, reproduces the magnesium alloy with fine grain (～10.5 μm) and the average microhardness is up to 0.89 GPa with high mechanical properties. After friction stir treatment, not only the surface quality is improved, but also the holes at the interface between weld pass laps and substrates are eliminated, and the grain is further refined (～9.7 μm), thus reducing the risk of fracture during service. The feasibility is emphatically verified the composite manufacturing of magnesium alloy arc cladding and friction stir processing, and a new idea for high-performance magnesium alloy additive manufacturing method is provided.

Key words: magnesium alloy, cold metal transfer, friction stir treatment, microstructure, microhardness

CLC Number:

TG156

LI Jianwei, HE Zhi, LONG Jianzhou, YIN Fengliang, GAO Hongyue, ZHAO Yue, GUO Xiaolin, WANG Zhimin, LIU Yuping, ZHANG Tiejun, GUO Bin. Control of Defects in Mg Alloy Arc Additive Repair Layer by Friction Stir Treatment[J]. Journal of Mechanical Engineering, 2022, 58(4): 55-61.

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