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绪言在等离子弧焊接中,压缩电弧保持在非熔化的钨极同喷口或工件之间的惰性气体中在熔化极惰性气体保护焊(MIG)中,电弧维持在工件和熔化电极之间,电极以焊丝形式送给。用冷的保护气体保护焊丝、电弧和焊道,以防止焊缝金属氧化和吸氮。而在等离子——熔化极气体保护焊(等离子MIG焊)中,焊丝的下部,脱离开的熔滴和MIG电弧被由钨极(位于焊丝旁边)所产生的高温等离子弧所包围。等离子弧的磁效应造成对焊接电弧的压缩,从而使焊缝得到较好的保护,电弧较为
INTRODUCTION In plasma arc welding, a compression arc is maintained in an inert gas between a non-molten tungsten orifice and a workpiece. In MIG welding, the arc is maintained between the workpiece and the melting electrode. The electrode Wire form to give. Protect the welding wire, arc and weld bead with cold shielding gas to prevent weld metal oxidation and nitrogen absorption. In plasma-gas arc welding (plasma MIG welding), the lower part of the wire, the detached drop and the MIG arc are surrounded by a high-temperature plasma arc generated by the tungsten electrode (located next to the wire). The magnetic effect of the plasma arc causes a compression of the welding arc so that the weld is well protected and the arc is more