Patent ID: 6191378
Filing Date: 2001-02-20
Classification: A62C,B23K

Abstract:
Welding apparatus, that includes a welding machine (1), that has at least a supply unit (1b) for welding current and means (1d2) for adjustment of the welding current, shielding gas unit (4), that has at least means (1d1) for observing, adjusting and processing of the feed volume of the shielding gas, and a nozzle part (3), that is to be kept in hand and that is connected to the welding machine (1) by means of a flexible pipe unit (2), whereby a 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, whereby to improve fire safety of the welding occasion, such as to eliminate risk of fire or to suppress fire, the welding apparatus includes furthermore a coupling arrangement (X) to lead shielding gas, that is led from the shielding gas unit (4) belonging to the welding machine (1), during a hazardous occasion to the point, that is exposed for risk of fire or that is already burning, which coupling arrangement (X) includes organs (X2), that are arranged to interrupt the supply of welding current to the nozzle part (3) and to lead shielding gas to the point exposed for fire or that is burning, by means of the flexible pipe unit (20) through the nozzle part (3) at an increased volume flow rate in respect to the welding occasion, characterized in, that a shielding gas provisioning means (Y), belonging to the coupling arrangement (X), is arranged essentially externally in respect to the welding machine (1) to supply shielding gas during the hazardous occasion directly from the shielding gas unit (4) past the welding machine (1) to the nozzle part (3).