Steel weld metal compositions can include from 9.00 to 12.00 wt % chromium, from 0.02 to 0.06 wt % carbon, from 0.3 to 0.7 wt % manganese, from 0.1 to 0.3 wt % silicon, from 0.5 to 1.2 wt % nickel, from 0.1 to 0.5 wt % molybdenum, from 1.0 to 1.5 wt % cobalt, from 0.03 to 0.08 wt % niobium, from 0.2 to 0.8 wt % tungsten, from 0.3 to 0.8 wt % copper, from 0.005 to 0.010 wt % boron, and from 0.005 to 0.025 wt % nitrogen; wherein the balance of the steel weld metal composition is iron and unavoidable impurities. Methods of depositing the steel weld metal compositions on a workpiece by an electric arc welding process are also described without the use of a post weld heat treatment. Consumable electric arc welding electrodes producing high chromium creep resistant steel weld metal compositions are also described.

The present disclosure is directed to systems and methods for pretreating a wire that is used in a welding operation to reduce the amount of hydrogen introduced into a weld. Using embodiments of the systems and methods disclosed herein, one passes a wire through a pre-treatment chamber in which a wire is treated to release hydrogen and/or other contaminants, and provides a gas flow through the pre-treatment chamber so that the contaminants that are released from the wire are taken up by the gas. The gas exiting the pre-treatment chamber may be isolated from the shielding gas utilized during a welding operation. For instance, the pretreatment gas may be directed away from the distal end of the welding torch, thereby preventing released contaminants from being transported into a weld.

A welding torch includes an inner tube of a helically wound wire to define a passage for a welding wire, a conduit in which the inner tube is inserted, the conduit having a curved portion, a torch body including a tip portion and a nozzle, a torch holder having a gas supplying member that supplies a shield gas into a space between the inner tube and the conduit, a feed unit provided upstream of the torch holder to feed the welding wire forward to or backward from the inner tube, and a sealing mechanism for preventing a reverse flow of the shield gas to the feed unit. A gap is defined between the adjacent wires of the inner tube allowing the shield gas to flow therethrough, and permitting wear debris generated by abrasion of the welding wire sliding in the inner tube to be ejected out from the nozzle.

A MIG welding torch adapter that attaches to and/or replaces a welding torch's nozzle and enables welding in confined spaces includes: (1) a wire guide, (2) a turning nozzle that is concentric with and encloses said wire guide, (4) a collar that detachably slip-fits onto a MIG welding torch's contact tip, (5) an attachment tube that attaches to the nozzle, (6) an entry guide wire adapter that directs the free end of the torch's electrode wire move into the wire guide, (7) an exit guide wire adapter that guides the electrode wire as it exits this adapter, and (8) entry and exit spacers that enable the torch's shielding gases to flow through this adapter.

An end assembly for use with a welding device having a chamber between the diffuser sleeve and the insert which allows for cooling the insert and for controlling the flow of gas through the end assembly. Some of the components of the end assembly such as the contact tip, insert and gooseneck are constructed of a conductive material which are securely held together in contact by a diffuser sleeve constructed of a dissimilar material. The end assembly provides better conductivity of the current through the end assembly for use of less energy during welding.

Method and device for marking a workpiece surface (2A) of a metal workpiece (2), in which a welding torch (3) comprising a welding wire electrode (4) is guided along the workpiece surface (2A) to be marked and meanwhile a wire end (4A) of the welding wire electrode (4) is moved towards and away from the work-piece surface (2A) to be marked, wherein an electric voltage (U) present at the welding wire electrode (4) and/or an electric current (I) flowing through the welding wire electrode (4) bring about electric sparks, which bring about material removal and/or material alteration at the workpiece surface (2A) of the metal workpiece (2) to mark the workpiece surface (2A).

A method of operating a welding torch using a rotating coupler assembly that operates between 0 and 800 amps. The rotating coupler assembly allows for 360 degrees of rotation while keeping rotational friction at a minimum. The breakaway torque for the rotating coupler assembly is insignificant and the rotating coupler assembly can be rotated with little effort by hand. While the rotating coupler assembly minimizes rotational friction the design allow for rotating coupler assembly to continue to operate after 1-5 mm of wear on the contact surfaces. An embodiment of the rotating coupler assembly can be quickly disconnected from the unicable.

In various embodiments, three-dimensional layered metallic parts are substantially free of gaps between successive layers, are substantially free of cracks, and have densities no less than 97% of the theoretical density of the metallic material.

In various embodiments, wire composed at least partially of arc-melted refractory metal material is utilized to fabricate three-dimensional parts by additive manufacturing.

A device for welding pipe branches and extensions from inside the main pipe. The device includes a frame, a frame cylinder, an elongated electrode shaft having a longitudinal central axis, a rotator disc through which the electrode shaft is able to slide axially, an end of shaft electrode holder, an electrode fastened to the holder, a welding jig with: a fastening element; a rotating element, which combines the rotational axis of the welding jig with the central axis of the electrode shaft; a main pipe support bracket; and an adapter piece which guides the shielding gas channel, into the main pipe and into the pipe branch or extension to be welded. The rotator disc is equipped with a locking device to immovably lock the electrode shaft in relation to the rotator disc.