| 摘要: |
| Magnesium (Mg) alloys have broad application prospects in the fields of aerospace， national defense， and military industries， owing to their advantages of high specific strength and stiffness， good damping properties， and excellent castabilities. However， defects such as oxidation inclusions， shrinkage cavities and porosities， and hot cracks are readily generated in Mg alloy components， which seriously reduce the performance stability of the products. Related repair welding technologies for Mg alloys can greatly reduce the rejection rate and production cost， and exhibit significant value in scientific research and engineering application. In this review， the weldability of Mg alloys is introduced firstly according to their physical and chemical properties. Then， various repair welding technologies and pre-weld treatments applicable to Mg alloys are systematically summarized， and the effects of welding parameters as well as heat treatments on the microstructure and performance of the repaired joints are clarified. Finally， the existing problems and development trends of repair welding technologies for Mg alloys are summarized based on the actual engineering application requirements. |
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1.National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite， Shanghai Jiao Tong University， Shanghai 200030， China;2.Shanghai Aerospace Precision Machinery Institute， Shanghai 201600， China
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