阐述了混合气体在熔化极气体保护焊中的应用现状，分析了保护气体成分的不同配比对熔化极气体保护焊的焊接工艺性能、焊接质量的影响。
This paper illustrates the applications of mixed gases in GMAW and analyzes the different proportion of shielding gas impacts on the welding technics performance and quality in GMAW.
通过试验在特征谱线下，采集了大量熔化极气体保护焊五种熔滴过渡的光谱信号波形。
A lot of spectrum of the metal transfer mode of metal gas are welding have been acquired in characteristic spectrum by testing.
采用熔化极惰性气体保护堆焊方式，在阀体密封面上均匀地熔敷镍基合金的耐磨焊层，从而达到改善阀体密封面的表面质量，显著延长阀体寿命的目的。
Using the MIG surfacing method, Ni-alloy was deposited evenly on the sealing face of valve to enhance the performance and prolong the life of the valve.
主要介绍了目前等离子—熔化极气体保护焊在采用不同的电极连接形式下，不同的电弧形态和熔滴过渡方式，以及电弧成分组成和温度分布；
This paper mainly introduces the different arc shapes, metal transfer modes, compositions of arc and temperature distribution in plasma-GMAW with different electrode connection forms at present;
主要介绍了目前等离子—熔化极气体保护焊在采用不同的电极连接形式下，不同的电弧形态和熔滴过渡方式，以及电弧成分组成和温度分布；
This paper mainly introduces the different arc shapes, metal transfer modes, compositions of arc and temperature distribution in plasma-GMAW with different electrode connection forms at present;
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