Abstract：The arc-ultrasonic was excited by modulating the TIG arc through high frequency and the homemade solder was filled in the weld as filler composite. The effect of arc-ultrasonic on pores, microstructures and mechanical properties of MGH956 alloy joints produced by arc-ultrasonic in-situ alloying TIG welding with different excitation current was investigated. The results show that when the excitation current is 10A, pores grow up obviously while the number of pores is reduced, moreover, the grains are coarse. When the excitation current increases to 20A, the number of pores sharply decreases, the grains are fine and uniform, and the particle reinforced phases are uniformly distributed in the weld. When the excitation current increases to 30A, the number of pores further decreases while the grains are coarsen. The tensile results indicate that the maximum tensile strength of the weld joint is achieved at an excitation current of 20A, which is 626MPa and reaches 87% of the base metal. The toughness of joints is improved obviously and the fracture surface changes from completely brittle fracture to ductile-brittle mixed fracture.
雷玉成, 龚晨诚, 罗雅, 肖波, 朱强. 激励电流对MGH956合金原位合金化TIG焊接头性能的影响[J]. 材料工程, 2015, 43(2): 7-13.
LEI Yu-cheng, GONG Chen-cheng, LUO Ya, XIAO Bo, ZHU Qiang. Effect of Excitation Current on Tensile Properties of Joint of MGH956 Alloy by In-situ Alloying TIG Welding. Journal of Materials Engineering, 2015, 43(2): 7-13.
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