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从焊接效率、焊缝质量和力学性能等方面，比较了双丝和单丝MIG焊接机器人对铝型材焊接的适用性。对于焊接4V坡VI型材，双丝比单丝焊接的焊丝熔化效率提高近1倍，而焊接热输入量降低了约18％，保护气体用量节约33％，焊缝抗拉强度提高约10～15MPa，非常适合轨道车辆中的长直焊缝的焊接。另一方面，双丝自动焊接机器人对操作者和设备本身要求更高，目前在轨道车辆行业普及程度并不高。因此，双丝取代单丝焊接仍需要一个长期的过程。

Application of Welding Robot in Aluminum Alloy Welding of Railway Vehicles

Compared double-wire with single-wire MIG welding robot from aspects of welding efficiency, weld quality and weld mechanical property. As far as welding of 4V profile was concerned, the efficiency of double-wire wel-ding was 100% more than that of single-wire, welding input reduced for 180%, amount of shielding gas saved for 33 %, and strength was improved by 10～15 MPa. Therefor, double-wire welding is suitable for long and straight welding in railway field. On the other hand, double-wire welding robot required higher level for operator and equipment, so it is not employed universally, and it takes a long process for double-wire welding to replace single-wire welding.