| 摘要 |
The invention relates to a welding apparatus, that includes a welding machine (1), shielding gas unit (4) and a nozzle part (3), that is connected to the welding machine (11). The welding rod (L), that is led to the welding point from the shielding gas unit (4), is arranged to be melted while being protected by the shielding gas in connection with the nozzle part (3) by means of an arc achieved by influence of the supply unit (1b) for welding current. To improve fire safety of the welding occasion, the welding apparatus includes furthermore a coupling arrangement (X), that comprises furthermore organs (X2), that are arranged to interrupt at least supply of welding current to the nozzle part (3) and to lead shielding gas to the point exposed for fire or that is burning through the nozzle part (3) at an essentially increased volume flow rate in respect to the welding occasion. A flow arrangement (Y) belonging to the coupling arrangement (X) is arranged essentially externally in respect to the welding machine (1) at least with a view to flow techniques, by leading shielding gas during the protecting situation in question directly from the shielding gas unit (4) past the welding machine (1) to the nozzle part (3).
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