作　　者： ; ; ; ; (谢幸儿）;

机构地区： 湖南工业大学冶金工程学院

出　　处： 《湖南工业大学学报》 2013年第3期79-83,共5页

摘　　要： 通过拉伸、弯曲、硬度试验,金相及透射电子显微分析等方法,对铝镁合金板材熔化极惰性气体保护焊(MIG)焊接接头的力学性能和显微组织进行了研究。结果表明:采用铝镁锆合金焊丝焊接铝镁合金板材时,焊接效果良好,且焊接接头具有较好的力学性能,焊接强度系数达85%;显微硬度值在84～104之间,其中焊缝中心硬度最低。通过添加微量Zr细化焊缝晶粒及其Al3Zr粒子的析出,能显著改善焊接接头的力学性能和抗热裂性。 Microstructure and mechanic properties of Al-Mg alloy sheet joint were investigated by tensile, bending and hardness tests as well as metallographic and transmission electron microscope analysis. The results show that the joint of Al-Mg alloy sheet welded with Al-Mg-Zr wire by MIG has good welding quality, and the welding joint has good mechanical properties with the welding strength coefficient of 85%. The hardness value of welded joint is within 84-104, of which the lowest is in weld center. Minor Zr can improve significantly the mechanical property and resistance thermal crack of welded joint, because of the fine grain strengthening and precipitation strengthening by Al3Zr.

关 键 词： 铝镁合金 熔化极惰性气体保护焊 焊接接头 微观组织

领　　域： [金属学及工艺]