A method is provided for fabricating a coolant channel closeout jacket on a structure having coolant channels formed in an outer surface thereof. A line of tangency relative to the outer surface is defined for each point on the outer surface. Linear rows of a metal feedstock are directed towards and deposited on the outer surface of the structure as a beam of weld energy is directed to the metal feedstock so-deposited. A first angle between the metal feedstock so-directed and the line of tangency is maintained in a range of 20-90°. The beam is directed towards a portion of the linear rows such that less than 30% of the cross-sectional area of the beam impinges on a currently-deposited one of the linear rows. A second angle between the beam and the line of tangency is maintained in a range of 5-65°.

There is described a modular welding device having a welding torch assembly defining a welding axis and having a welding torch rotatable about the welding axis. The welding device further includes a drive assembly releasably attachable to the welding torch assembly and operable to linearly translate the welding torch assembly along an axis of translation. When the drive assembly is attached to the welding torch assembly in a first orientation relative to the welding torch assembly, the drive assembly is detachable from the welding torch assembly and re-attachable to the welding torch assembly so as to be disposed in a second orientation relative to the welding torch assembly.

A mobile hardbanding system that uses PTA welding to perform hardbanding on drill string sections at the well site. The inventive system allows alternate use of PTA and MIG welding. Both a PTA torch and a MIG torch are provided. Changing from one type of welding to the other is simplified by including separate electrical, gas, and cooling conduits for each torch. The torch not in use is parked in the welding compartment near the weld box. The powder hopper for the PTA welding assembly may be mounted on a swivel arm so that it can be moved out of the way when the MIG torch is in use.

A method for hard surface deposition on aluminum metal parts of a turbine engine using MIG welding equipment which includes a pulsed current generator and pulsed filler metal wire feed, wherein the deposition is achieved using a filler metal wire whose composition is of the same nature as the composition of the aluminum alloy of the part to undergo hard surface deposition, with the pulsed metal wire feed and speed of deposition on the metal part of the turbine engine being adapted to carry out deposition without hot fissuring.

A sprocket wheel, which is an example of the machine component, includes a base made of a first metal, and an overlay disposed in contact with the base to cover at least a part of a surface of the base. The overlay includes a matrix made of a second metal, and hard particles dispersed in the matrix. The surface of the overlay is a forged surface. The hard particles located in an overlay surface region within an average particle diameter of the hard particles from the surface of the overlay are arranged side by side while being embedded in the overlay.

An apparatus and related method for cooling a hard metal applied in a molten or semi-molten state to the surface of a metal substrate employ a chill block chilled by a cryogenic coolant conducted through a coolant passage in the chill block with at least one ejector port in communication with the coolant passage arranged to eject cryogenic coolant from the chill block onto the hand metal for further cooling the hard metal. An alloy steel substrate preheated to 300 to 600 degrees Fahrenheit has a hard metal applied thereto by an arc welding process.

A solid-bowl centrifuge screw with a screw hub with a first welding layer applied to a base, and at least a second welding layer applied to the first welding layers. Thus, the screw hub is produced by a shaping build-up welding method.

A solid-bowl centrifuge screw with a screw flight is provided. The screw flight has at least a first welding layer on a base body of the solid-bowl centrifuge and at least a second welding layer on the first welding layer. Thus, plural welding layers are disposed successively on one another and are applied by shaping build-up welding.

In a metal laminating and modeling method, a three-dimensional modeled object 10 having a main surface 12 and an outer circumferential surface 13 is modeled by sequentially laminating a plurality of metal layers 11m. The metal laminating and modeling method has a metal layer formation step of forming the metal layers 11m by forming a plurality of weld beads 100 so as to be arranged in a horizontal direction on a table 2, and a first end portion weld bead formation step of inclining the table 2 such that a target surface 2f faces in a first inclination direction and forming first end portion weld beads 100a so as to overlap, among a plurality of center weld beads 100c, the center weld beads 100c located at an uppermost end in a vertical direction Dv.

An excess metal amount setting method includes: a thermal shrinkage prediction step of predicting a thermal shrinkage amount in the deposited body after manufacturing; a thermal shrinkage modifying step of obtaining a thermal deformation modifying profile by expanding a target profile according to the thermal shrinkage amount; a release strain prediction step of predicting an elastic deformation amount due to release strain of the deposited body after machining; an elastic deformation modifying step of obtaining an elastic deformation modifying profile by deforming the thermal deformation modifying profile according to the elastic deformation amount in a direction opposite to a deformation direction due to the release strain; and an excess metal amount setting step of adjusting an outer edge shape of the deposited body so that an excess metal amount from the elastic deformation modifying profile to an outer edge of the deposited body falls within a predetermined reference range.