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Study on the microstructure and properties of TIG welding joint for AZ91D magnesium alloy

Meng Xian-chao

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Abstract

AZ91D magnesium alloy was welded with consubstantial welding wire by TIG welding.The microstructure feature and mechanical properties of joint have been analyzed by analysis methods such as optical microscope,XRD,tensile testing machine and Brinell hardness tester.The results show that,at 140 A welding currents and 12 L/min Ar flowed,the tensile strength of the welded joints is about 80% of the base metal,and that tensile samples always fractured at heat affected zones.The microstructure is a finely equiaxed crystal in the welded zone,consisting of α-Mg and Mg17Al12,which are finer than that of base metal.

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What this paper is about

AZ91D magnesium alloy was welded with consubstantial welding wire by TIG welding.The microstructure feature and mechanical properties of joint have been analyzed by analysis methods such as optical microscope,XRD,tensile testing machine and Brinell hardness tester.The results show that,at 140 A welding currents and 12 L/min Ar flowed,the tensile strength of the welded joints is about 80% of the base metal,and that tensile samples always fractured at heat affected zones.The microstructure is a finely equiaxed crystal in the welded zone,consisting of α-Mg and Mg17Al12,which are finer than that of base metal.

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Available abstract

AZ91D magnesium alloy was welded with consubstantial welding wire by TIG welding.The microstructure feature and mechanical properties of joint have been analyzed by analysis methods such as optical microscope,XRD,tensile testing machine and Brinell hardness tester.The results show that,at 140 A welding currents and 12 L/min Ar flowed,the tensile strength of the welded joints is about 80% of the base metal,and that tensile samples always fractured at heat affected zones.The microstructure is a finely equiaxed crystal in the welded zone,consisting of α-Mg and Mg17Al12,which are finer than that of base metal.

Key concepts: Brinell scale, Materials science, Metallurgy, Welding, Microstructure, Equiaxed crystals, Gas tungsten arc welding, Ultimate tensile strength

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