Holding other license such as mechanical work, welding, pressure vessel, etc is preferred.
持有别的证书如机械、电焊、压力容器证书是优先的。
To remove internal stress such as those produced by drawing, bending, or welding.
去除内应力，如用冲压、完全或焊接成型的工件。
One whole welding process can be finished just as you trodding the foot switch.
只要踩一下脚踏开关就可完成一次焊接全过程。
One whole welding process can be finished just as you trodding the foot switch.
只要踩一下脚踏开关就可完成一次焊接全过程。
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