The constricting nozzle of the present invention includes (i) a cylindrical nozzle body disposed around the forward end of the tungsten electrode rod concentrically with the tungsten electrode rod and defines an annular high-speed gas passage between the nozzle body and the outer peripheral surface of the forward end of the tungsten electrode rod, (ii) a plurality of positioning projections that are protrudently formed on the inner peripheral surface of the nozzle body with predetermined intervals in the circumferential direction and that are arranged along the longitudinal direction of the nozzle body to hold the tungsten electrode rod in the center position of the nozzle body, and (iii) a plurality of gas-flow regulating grooves formed between the positioning projections and that extend in parallel in the longitudinal direction of the nozzle body and regulate the shielding gas (G) flowing through the high-speed gas passage.

A method of metal inert-gas welding is proposed, a method in which a welding filler (1) is fed to a welding torch (10) and a welding current of a welding current source (30) is applied via a welding current connection (5), whereby an arc (7) is formed and, in a welding region, material of the welding filler (1) is transferred to a workpiece (20) consisting at least in the welding region of an alloyed high-grade steel. By means of the welding torch (10), an inert gas that includes a content of 0.5 to 3.0 percent by volume of at least one oxidizing component and a content of 0.1 to below 0.5 percent by volume of hydrogen is fed to the welding region. A method of reducing the content of nickel oxides and chromium (VI) compounds in welding fumes of such a welding method, a corresponding inert gas and the use of a gas mixture as an inert gas are likewise the subject of the present invention.

A method for producing a welded joint between a high-strength aluminum alloy with a copper proportion as a first metal and a second metal, in which the welded joint is produced by CMT welding.

A welding torch includes a non-consumable electrode extending along an axial direction, a first member disposed outwardly of the non-consumable electrode, an inner nozzle disposed outwardly of the non-consumable electrode, an engaging member disposed outwardly of engaging with the first member and the inner nozzle, an outer nozzle disposed outwardly of the inner nozzle, and an electrode extrusion member disposed outwardly of the non-consumable electrode and inwardly of the inner nozzle. The electrode extrusion member is concentrically disposed outwardly of the non-consumable electrode, and the inner nozzle is concentrically disposed outwardly of the electrode extrusion member. A first gas flow path for flowing a first inert gas is provided between the non-consumable electrode and the inner nozzle. A second gas flow path for flowing a second inert gas is provided between the inner nozzle and the outer nozzle.

Systems and apparatus are disclosed relating to improved fluid supply systems. In some examples, the improved fluid supply systems use an electrically controllable proportional valve and a surge prevention process to prevent a surge of pressurized fluid at the end of a welding-type operation. In particular, the surge prevention process may coordinate closure of the proportional valve and an on/off solenoid valve so that pressure in the fluid flow path can equalize to an ambient pressure after a welding operation (and/or a post flow operation) has ended. This coordination ensures that there is no pressure buildup and/or associated surge of fluid when the on/off solenoid valve is next opened (e.g., at the start of the next welding operation).

A TIG welding device (10) includes a welding robot (11), robot control device (12), welding torch (13), welding control device (14), gas feeder (15), and a height detection device (16). The welding torch (13) is set at a reference position, and the height detection device (16) detects the respective heights of two tip parts (4e). The robot control device (12) drives the welding robot (11) such that a torch electrode (13c) of the welding torch (13) abuts on central part of the higher tip part (4e). When the torch electrode (13c) is moved toward the reference position while power is supplied to the torch electrode (13c), and inert gas flows in the periphery of the torch electrode (13c), arc (AC) is generated in a gap between the tip parts (4e) and the torch electrode (13c). The overall two tip parts (4e) are melted and welded by this arc (AC).

The present invention provides a welding apparatus and a welding method for ultra-narrow welding gap, relating to the technical field of welding with an ultra-narrow welding gap. The welding apparatus for ultra-narrow welding gap comprises: a blowing mechanism, a conductive nozzle and an industrial water-cooling unit. The industrial water-cooling unit is connected to the blowing mechanism. A medium flow of the industrial water-cooling unit flows through the inside of the blowing mechanism. The industrial water-cooling unit is configured to reduce a temperature of the shielding gas outputted by the blowing mechanism and a temperature of the conductive nozzle.

A irradiation welding apparatus including an irradiation welding generator having at least one irradiation welding head configured to apply an irradiation treatment to end contact surfaces of a first profile and a second profile to join the first profile and the second profile, where the at least one irradiation welding head forms a planar cross-sectional shape in an x-y directional plane relative to the irradiation welding generator.

A system, a non-transitory computer readable medium for executing instructions, and a method for fabricating a subsea connector, including selecting a substrate on which to form the subsea connector, positioning the substrate on a welding positioner base, and applying a first weld bead using a first multiple axis robot, applying a second weld bead using a second multiple axis robot, forming a plurality of weld bead layers comprising the first weld bead and the second weld bead, and forming a subsea connector formed from the plurality of weld bead layers.

An automatic activator coating device for wire and arc additive manufacture includes a base, a mechanical arm is arranged on the upper side of the base, a clamping mechanism is arranged at the lower end of the mechanical arm, a container bottle is clamped on the clamping mechanism, one end of the container bottle is communicated with a sprayer, one end of the sprayer is communicated with an atomizing nozzle, the container bottle is communicated with the gas bottle, and a gas pressure regulating valve is arranged on the gas bottle; and a piston partition is arranged in the sprayer, the container bottle is communicated with an activator converging cavity in one end of the sprayer, a piston rod and a resetting mechanism are arranged in a mounting cavity in the other end of the sprayer, an open hole is formed in the inner surface of the sprayer.