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为了提高镁合金焊接性,外加横向直流磁场下对厚度为5mm的AZ91镁合金板进行TIG焊。通过对其不同磁场电流下所得焊接试样进行抗拉强度和硬度试验,以及焊缝区金相组织分析,系统地研究了磁场电流对焊接接头力学性能和微观组织的影响。结果表明,通过外加横向磁场对熔池进行搅拌,可以使焊缝晶粒得到细化,进而使其抗拉强度和硬度等力学性能得到改善;当磁场电流Im=1.5A时,焊接接头的力学性能达到最大值,此时焊缝硬度85.27 HV,抗拉强度为325.2MPa。
In order to improve the weldability of magnesium alloys, TIG welding was performed on the AZ91 magnesium alloy plate with a thickness of 5 mm under a transverse DC magnetic field. The tensile strength and hardness of the welded samples obtained under different magnetic field currents and the metallographic structure of the weld zone were systematically studied. The effects of magnetic field current on the mechanical properties and microstructure of the welded joints were studied systematically. The results show that by adding a transverse magnetic field to the molten pool, the weld grains can be refined, and the mechanical properties such as tensile strength and hardness can be improved. When the magnetic field current Im = 1.5A, the mechanical properties of welded joints Performance reached the maximum, at this time the weld hardness 85.27 HV, tensile strength of 325.2MPa.