Welding torch system for use in welding or cutting operations, welding torch for use in such a welding torch system and method for welding using such a welding torch system or such a welding torch

摘要

Welding torch system for use in welding or cutting operations during which fume is created. The welding torch system has a welding torch (1) comprising a contact tip holder (2) and a coaxial nozzle (11) comprising an inner shield gas conduit (5) having a shield gas outlet (6) for supplying a shield gas. The inner shield gas conduit (5) surrounds the contact tip holder (2). An outer shell (7) at least partly surrounds said inner shield gas conduit (5). The welding torch system further comprises a shield gas generator and supply unit (12) and a fume extracting assembly (13). The welding torch system is arranged for supplying shield gas through the shield gas outlet at a velocity between about 1.5 m/s and 10 m/s. By operating the fume extracting assembly to generate a flow of between 10 and 100 m³/h, preferably a flow of about 55 m³/h a reduction in the area of 90%-95% of hazardous fumes can then be realized. A welding torch (1) for use in such a system has an inner shield gas conduit (5) having an end portion with an inner surface of which the diameter decreases towards the shield gas outlet (6). In a method for welding the shield gas is supplied through the shield gas outlet at a velocity between about 1.5 m/s and 10 m/s.