Development of Automatic Control System in Plasma-MIG Hybrid Welding

在惰性保护气体保护下，等离子焊接可以获得深熔透。在惰性保护气体的作用下，也能获得良好的力学性能。但焊接效率不高。另一方面，采用MIG焊实现了高效率的焊接。熔化极气体保护焊中的电弧变得不稳定。为提高电弧稳定性，研制了等离子-MIG复合焊接系统。设计了控制电路，实现了等离子焊与MIG焊的同步。利用该电路和高速摄像机对电弧现象进行了分析。规定了安装和焊接的条件。

The deep penetration can be obtained in plasma welding under inert shielding gas. The good mechanical property can be obtained due to the inert shielding gas, too. But efficiency of the welding is not good. On the other hand, a high efficiency of the welding was achieved by using MIG welding. The arc in MIG welding becomes unstable. In order to improve the arc stability, the hybrid welding system by using plasma and MIG welding was developed. The control circuit was made to synchronize the plasma welding with the MIG welding. Arc phenomena were analyzed by using the circuit and by taking with high speed video camera. The conditions for set up and welding were specified.