全面系统地介绍了脉冲熔化极气体保护焊的各种控制方式，并明确地把它们分为两类：参数控制和熔滴过渡精确控制。
This article introduces all kind of control method of pulse melting pole in gas protection welding, and divided them into two kind: parameter control and melt dripping transition accurate control.
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;
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.
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