A plasma ejection unit (21) of an arc welding device includes a plasma torch (26), a copper plate (27), a container (28), and a gas supplying unit (29). Plasma gas inside the container (28) is pressurized by argon gas supplied from the gas supplying unit (29), and ejected from first to eighth ejection ports. The plasma gas ejected from the first to eighth ejection ports is concentrated in a concentration area (CA) between vehicle body plates (16-17) to form through holes (40) in the vehicle body plates (16-17), and is separated. The air pressures, in eight areas, of the plasma gas reaching a vehicle body plate (18) are approximately one-eighth of the air pressure of the plasma gas in the concentration area (CA). Accordingly, while the through holes (40) are formed in the vehicle body plates (16-17), no through hole is formed in the vehicle body plate (18).

A fume extractor has an extractor housing (110, 210) defining an outlet (106, 206). A hose (120, 220) is coupled to the extractor housing that defines a first inlet (102, 202). A diffusion plate (130, 230) is coupled to the extractor housing that defines a plurality of openings (132, 232) cumulatively defining a second inlet (104, 204). A fan (280, 530) is disposed in the extractor housing, where the fan configured to connect each of the first inlet and the second inlet to the outlet. A first supporting surface (160) is opposite the diffusion plate relative to the extractor housing and a second supporting surface (170) at least 80° to the diffusion plate, where the first supporting surface and the second supporting surface are configured to selectively rest on a planar surface. The fume extractor defines a hose channel (140) configured to selectively receive the hose.

A welding gun for welding a welding stud to a substrate in a welding direction is provided, comprising a holding device for holding the welding stud during a welding operation, wherein the welding stud has a contact surface which is intended to contact the substrate before and/or during the welding operation, further comprising a stud lifting device for conveying the holding device against the welding direction to an immersing start position, further comprising a stud immersing device for conveying the holding device from the immersing start position in the welding direction, further comprising a bearing element having a bearing surface for supporting the welding gun on the substrate, and further comprising a device for automatically adapting the immersing start position relative to the bearing surface in the welding direction.

A smoke and dust treatment apparatus for welding, said apparatus comprising a polishing and dust extraction module and a smoke and dust purification module. The polishing and dust extraction module comprises a double-layer dust extraction cover (3), a protective cover (2), an industrial brush (4), a first air guide portion, a second air guide portion (24) and a drive motor (22), the drive motor (22) driving the industrial brush (4) to rotate at high speed to perform polishing. During welding and polishing, a mechanical arm (6) drives the double-layer dust extraction cover (3), and a suction hole (20) of the double-layer dust extraction cover (3) and a suction guide hole (19) on the industrial brush (4) simultaneously take in toxic gas and debris such as iron filings.

A three-dimensional (3D) metal object manufacturing apparatus is configured to increase the oxidation of ejected melted metal drops for the formation of metal support structures during manufacture of a metal object with the apparatus. The oxidation can be increased by either increasing a distance between the ejector head and a platform supporting the metal object or by providing an air flow transverse to the direction of movement of the melted metal drops, or both.

An extractor system includes a negative pressure gas stream source, a negative pressure conduit, a positive pressure gas stream source, a plurality of positive pressure gas stream manifolds, and an operator interface. The negative pressure conduit is conveys the negative pressure gas stream from a work area. A first end of the negative pressure conduit is coupled to the negative pressure gas stream source, such that the negative pressure gas stream flows from the work area through a second end of the negative pressure conduit and toward the first end of the negative pressure conduit. The positive pressure gas stream manifolds are disposed about the negative pressure conduit at the second end of the negative pressure conduit, and fluidly coupled to the positive pressure gas stream source. The positive pressure gas stream is directed through the plurality of positive pressure gas stream manifolds. The operator interface allows a user to control the positive pressure gas stream through each of the plurality of positive pressure gas stream manifolds.

A sensor device includes a sensor to detect a light beam to measure states of work pieces or a distance to the work pieces, a case body housing the sensor, and a protective cover including a protective plate that transmits the detection light beam. The protective cover includes a gas flow channel that passes a gas to be blown to the protective plate, the gas flow channel having formed therein an outlet port that passes the detection light beam and discharges the gas having flowed through the gas flow channel. The gas flow channel includes an accumulator between the protective cover and the case body adapted to have accumulated therein the gas flowing through the gas flow channel, and the accumulator includes vent holes through which the gas is allowed to flow out toward the outlet port.

A welding torch for arc welding in a shielding gas atmosphere, includes: a contact tip for feeding a welding wire; a suction nozzle surrounding the welding wire, and sucking a gas from a space between the suction nozzle and the welding wire; and a shielding gas supply nozzle provided on the outer periphery of the suction nozzle, and supplying the shielding gas toward a welded portion from a space between the shielding gas supply nozzle and the suction nozzle. The welding torch satisfies “7≤Ltk≤17 and 0≤Lts≤18”, where Lts [mm] is a distance between the tip of the contact tip and the tip of the shielding gas supply nozzle, and Ltk [mm] is a distance between the tip of the contact tip and the tip of the suction nozzle.

An extractor system includes a negative pressure gas stream source, a negative pressure conduit, a positive pressure gas stream source, a plurality of positive pressure gas stream manifolds, and an operator interface. The negative pressure conduit is conveys the negative pressure gas stream from a work area. A first end of the negative pressure conduit is coupled to the negative pressure gas stream source, such that the negative pressure gas stream flows from the work area through a second end of the negative pressure conduit and toward the first end of the negative pressure conduit. The positive pressure gas stream manifolds are disposed about the negative pressure conduit at the second end of the negative pressure conduit, and fluidly coupled to the positive pressure gas stream source. The positive pressure gas stream is directed through the plurality of positive pressure gas stream manifolds. The operator interface allows a user to control the positive pressure gas stream through each of the plurality of positive pressure gas stream manifolds.

The invention relates to a method for the dynamic feeding of shielding gas, comprising feeding a shielding gas to a component in a welding operation, sending the temperature of a region of the component; and setting a composition of the shielding gas according to the sensed temperature.