以ZM6镁合金薄壁铸件为研究对象,通过OM、SEM观察和显微硬度以及拉伸性能测试等分析测试手段,研究焊接电流对焊接接头质量的影响规律。研究发现:随着焊接电流的增大,焊缝区的晶粒尺寸减小,显微硬度增大;而焊接接头的抗拉强度随电流的增加呈先缓慢增加后减小的变化趋势;随焊接电流的增大,焊接裂纹的敏感性也随之增加。 ZM6 magnesium alloy thin-walled castings as the research object, by OM, SEM observation and microhardness and tensile properties of test methods such as analysis and analysis of the welding current welding quality of the law. The results show that with the increase of welding current, the grain size of the weld zone decreases and the microhardness increases. The tensile strength of the welded joint increases slowly and then decreases with the increase of the current. Welding current increases, the sensitivity of welding cracks also increases.