The system uses PLC procedure control, start-up, forward or backward soldering gun, arc starting, workpiece circumgyration, etc full welding process all can complete automatically.

系统采用PLC程序控制，启动、进退枪、引弧、工件旋转等焊接全过程均能自动完成。

There is no complete, systematic simulation available in procedure control because of discon-nection among tower control service, approach control service and area control service.

在程序管制模拟练习中，存在着塔台管制服务、进近管制服务和区域管制服务互不衔接，不能系统地模拟整个管制过程的问题。