| 摘要 |
Welding apparatus comprising a power and gas transmission cable having coupling means including normally closed valve means for controlling passage of gas from said cable, a first welding torch including a gas passage and having first torch coupling means adapted for connection to said cable coupling means, said torch coupling means including means for opening said valve means with said first torch and cable coupling means connected, and a second welding torch having second torch coupling means adapted for connection to said cable coupling means, said second torch coupling means adapted to maintain said valve means closed with said second torch and cable coupling means connected.
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