Due to its advantages,such as good formability,excellent corrosion resistance and low cost,low-alloyed Mg alloys have become one of the important trends in the development of wrought Mg alloys.Welding has become a key method for the widespread application of these materials.However,low-alloyed Mg alloys face the challenges in welding,such as coarse grain structure in the fusion zone and insufficient strengthening phases,leading to mismatched welding strength.This paper,based on relevant theories of Mg alloy welding metallurgy,summarized the methods for controlling the microstructure of low-alloyed magnesium alloy welds,and systematically discussed the evolution process and mechanism of weld microstructure.Finally,in response to the application demands of these alloys in welding,the development trends in this field were prospected.
关键词
低合金化镁合金/熔化焊接/焊缝组织/晶粒细化/工艺调控
Key words
low-alloyed Mg alloy/fusion welding/weld microstructure/grain refinement/process control
维普
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