| 摘要 |
A plasma welding method has successive steps including pre-heating of members (15, 16) to be welded, tack welding of the for the members (15, 16) for tentatively fixing these members (15, 16), keyhole welding for completely welding the members (15,16) to each other, and finish padding. These steps are automatically conducted by a single plasma welding apparatus operative in accordance with a programmed sequence including data concerning the optimum conditions of operation in each step in relation to the conditions such as sizes and materials of the members (15,16) to be welded. The apparatus has a welding torch (7), a welding head on which the welding torch (7) is mounted for rotation, a controller (5) adapted for storing the optimum welding conditions for successive steps of the welding process in relation to the conditions of the members (15,16) to be welded, a power supply system (1) for transmitting welding current and welding speed signal to the welding head (6) in accordance with a command provided by the controller (1), and a gas supply system (11,14a,18) for supplying a plasma gas at a rate determined in accordance with a command from the controller (5).
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