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中文摘要：
介绍一种新的铝-钢异种金属焊接方法脉冲旁路耦合电弧MIG焊（pulsed DE-GMAW）,将该方法应用于铝和镀锌钢板的焊接,得到成型良好的焊缝.采用接触式测量法测量pulsed DE-GMAW法在不同焊接参数下的热循环曲线,并与CMT进行对比分析,结果表明：CMT法通过推拉丝及短路波形控制能减小焊接过程中的热输入;而pulsed DE-GMAW法通过增加旁路电流达到分流的目的,也可以降低输入母材的热量,2种方法的热输入控制效果相当,均能较好实现铝-钢异种金属的焊接.
英文摘要：
A new method for heterogeneous metal welding of aluminum and steel （pulsed DE-GMAW） was introduced. A well-formed weld was obtained with this method to weld aluminum and galvanized steel plate. The contact-type measurement method was employed to test the thermal cycling curve of welding with pulsed DE-GMAW with different welding parameters. Then the test result was compared to that with CMT. The results showed that CMT could reduce welding heat-input by means of pushing-drawing the welding wire and controlling the short-circuit waveform. And by using the pulsed DE-GMAW, the heat- input could be reduced by adding by-pass current. Whether pulsed DE-GMAW or CMT could equally control the heat-input better to realize welding heterogeneous metal of aluminum and steel.
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