Abstract: Welding torch system for use in welding or cutting operations during which fume is created. The welding torch system has a welding torch comprising a contact tip holder and a coaxial nozzle comprising an inner shield gas conduit having a shield gas outlet for supplying a shield gas. The inner shield gas conduit surrounds the contact tip holder. An outer shell at least partly surrounds said inner shield gas conduit. The welding torch system further comprises a shield gas generator and supply unit for supplying shield gas through the shield gas outlet and a fume extracting assembly for extracting fume and ambient air. The welding torch system is arranged for—during operation—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.

Abstract: A multi-cyclone dust separating apparatus comprises a housing with an air inflow port, an air outflow port separate from the air inflow port and an air flow channel extending in an air flow direction from the air inflow port to the air outflow port. The apparatus further comprises a plurality of cyclones arranged in a matrix arrangement and in the air flow channel. Each cyclone comprises a cylindrical portion defining an inside vortex space. The cylindrical portion has a top end and a lower end. A conical portion contiguous to the lower end has a dust opening at its bottom. An air inlet is arranged tangentially with regard to the cylindrical portion and opens in the inside vortex space. The air inlet has an effective air passage surface area. An air outlet tube having an air outlet passage is arranged at the top end of the cylindrical portion and extends into the inside vortex space.

Abstract: Welding torch system for use in welding or cutting operations during which fume is created. The welding torch system has a welding torch comprising a contact tip holder and a coaxial nozzle comprising an inner shield gas conduit having a shield gas outlet for supplying a shield gas. The inner shield gas conduit surrounds the contact tip holder. An outer shell at least partly surrounds said inner shield gas conduit. The welding torch system further comprises a shield gas generator and supply unit for supplying shield gas through the shield gas outlet and a fume extracting assembly for extracting fume and ambient air. The welding torch system is arranged for—during operation—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.

Abstract: The present invention relates to a device for performing welding operations, comprising: a core member in which can be guided a welding wire connectable to a voltage source; an extraction member arranged on the outside of the core member for extracting substances inconvenient to the welder; a gas supply member arranged on the outside of the extraction member for supplying gas. The invention also relates to an assembly for welding a weldment, comprising: a device as claimed in any of the claims 1-9, welding wire supply means for supplying welding wire; gas supply means for supplying gas via the gas supply member; a voltage source for applying electrical voltage between the welding wire and the weldment; pumping means for exhausting substances inconvenient to the welder via the extraction member.