| 摘要 |
A welding torch (10) for gas tungsten arc (tungsten inert gas) welding includes a housing (12) and an electrode holder (50, 52) which is mounted on the housing so as to project therefrom, and which is adapted to hold an electrode (54) such that the electrode projects from an end of the holder remote from the housing. A shroud (14) is mounted on, or forms part of, the housing (12) and extends around but is spaced from the electrode holder (50, 52). Electrically conductive means (46, 48) extends within the housing (12) for electrically connecting the electrode holder (50, 52) to one terminal of an electric power source. The torch (10) is adapted for connection to a source of an inert gas for generating a flow of gas through the shroud (14), around the electrode holder (50, 52). Also the torch (10) has inlet port means (30; 94a) and outlet port means (32; 95a) by which it is adapted for connection to a source of coolant fluid for circulation of the coolant through a passage (28) defined within the housing (12) and extending along substantially the full extent of the conductive means (46, 48), and through a passage (93) defined within the shroud (14).
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