高速列车用厚板铝合金CMT焊接工艺

发布时间：2018-08-02 11:09

【摘要】：针对低热输入、高质量焊接技术的需求,研究厚板铝合金多层多道冷金属过渡技术(cold matal transter,CMT)焊接工艺和脉冲MIG焊接工艺的区别,对CMT焊接和脉冲MIG焊接进行热循环曲线测量,焊接接头拉伸、弯曲、硬度等常规力学性能试验和接头微观组织分析.结果表明,铝合金厚板焊接时相对脉冲MIG焊接方法,CMT方法焊接温度场低,焊接接头软化明显减弱,冲击韧性得到提高,厚板多层多道焊接接头组织明显改善,晶粒明显细化.试验表明CMT焊接方法可获得相对脉冲焊接更加优良的铝合金焊接接头.
[Abstract]:In view of the requirement of low heat input and high quality welding technology, the difference between (cold matal transterite welding process and pulsed MIG welding technology for thick aluminum alloy multilayer and multi-pass cold metal transfer technology is studied. The thermal cycle curves of CMT welding and pulsed MIG welding are measured. Tensile, bending, hardness and other conventional mechanical properties of welded joints and microstructure analysis. The results show that the welding temperature field of aluminum alloy thick plate is lower than that of pulse MIG welding method, the softening of welded joint is obviously weakened, the impact toughness is improved, the microstructure of thick plate multilayer multi-pass welding joint is improved obviously, and the grain size is obviously refined. The results show that CMT welding method can obtain better welding joints of aluminum alloy than pulse welding.
【作者单位】：南车青岛四方机车车辆股份有限公司技术本部;
【基金】：四方股份工艺开发资助项目(2012.539)
【分类号】：TG457.14

【共引文献】