A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.

A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.

An apparatus for automation of weld seams machining of a wind turbine tower is provided. The apparatus includes an automated arm; a machining tool fixed to the automated arm; a compensator system fixed to the machining tool or being part of the automated arm; a joint visor that identifies and locates the weld seam; and a control unit to coordinate the movement of the machining tool with the compensator system and the joint visor. A method of performing a welded circular seam machining in a wind turbine tower with the apparatus is also provided.

Provided is a black stainless steel sheet that has excellent weldability, that can ensure good toughness and corrosion resistance, and that can maintain the blackness of the surface thereof, even after being welded. This black ferrite-based stainless steel sheet having excellent weldability includes, as a base, a stainless steel containing, in mass %, 0.020% or less of C, 1.0% or less of Si, 0.35% or less of Mn, 0.04% or less of P, 0.005% or less of S, 11-25% of Cr, 1.0% or less of Mo, 0.020% or less of N, 0.4% or less of Al, 10(C+N) to 0.3% of Ti, 0.05% or less of Nb, and 0.01% or less of 0, and has a surface in which an oxide coating is formed on the base, wherein the surface has a lightness index (L*) satisfying L*<45, chromaticity indices (a*, b*) satisfying 5a*5 and 5b*5, and a blackness (E) satisfying E=(L*2+a*2+b*2)1/245.

The invention relates to a heat-exchanger element for connection to tubes of a heat exchanger, the heat-exchanger element (1, 29, 32) consisting of a plurality of components (13, 14) welded to each other, and said components (13, 14) being interconnected by electron beam welding and being part of a heat exchanger head.

A method for manufacturing tooling includes forming a shape, forming a metallic plate over the shape, forming a structure over the metallic plate, and removing material from the metallic plate for obtaining the final tooling. The method permits material saving, as less scrap is produced and there is more flexibility in tooling design and manufacturing, and fast reactions to late design modifications.

A welding system includes a welder configured to create an assembly by forming a weld-joint, a test-device configured to produce test-data indicative of a characteristic of the weld-joint, and a controller-circuit in communication with the welder and the test-device. The controller-circuit is configured to determine whether the welder-process-data violates a quality-metric and determine a number of violating-weld-joints.

A spark absorbing system for use with a cutting torch, comprises a cap having at least one spark opening therethrough and a spark capture unit coupled to the cap and positioned to capture sparks passing through the spark opening. The spark capture unit may comprise a tube extending from the cap and may include an outlet and a flow-reduction element positioned between the cap and the outlet and/or a spark accumulator between the cap and the spark capture unit. The flow-reduction element may comprise at least one baffle, screen or mesh. The spark absorbing system may further include a spark ramp extending from the cap opposite the spark capture unit and/or a shield, which may define a cutting space between the shield and the cap.

A method of manufacturing an impeller, the method including: a step of forming a cover that is provided with a plurality of blades; a step of disposing a core on the cover such that the core is interposed between the blades; a step of disposing a hub on the blades, the hub being a plate on which grooves conforming to shapes of the blades are formed; and a step of welding the hub and the blades, wherein through-holes conforming to the shapes of the blades are provided on the core, such that the blades are fitted in the core when the core is disposed.

Embodiments of systems and methods of additive manufacturing are disclosed. In one embodiment, a computer control apparatus accesses multiple planned build patterns corresponding to multiple build layers of a three-dimensional (3D) part to be additively manufactured. A metal deposition apparatus deposits metal material to form at least a portion of a build layer of the 3D part. The metal material is deposited as a beaded weave pattern, based on a planned path of a planned build pattern, under control of the computer control apparatus. A weave width, a weave frequency, and a weave dwell of the beaded weave pattern are dynamically adjusted during deposition of the beaded weave pattern. The adjustments are under control of the computer control apparatus based on the planned build pattern, as a width of the build layer varies along a length dimension of the build layer.