During the repair of welded two-stage or multi-stage compressor or turbine drums, which after welding are machined in the weld area down to a height A, a first material coating with a height B extending on both sides from the root face is applied to the machined weld area, and a second and lesser material coating is applied by laser welding to the area of plasma pockets formed on the intact rotor disk, with the sum of the heights A and B corresponding to an original height C in the weld area prior to its final machining. Then the defective rotor disk is detached in the root face and through the middle of the first material coating, and after that a new rotor disk already validated in the new construction with the root face validated in the new construction is welded on using appropriate welding parameters, and the weld area is machined, in line with the parameters already used for the new construction, down to the original height A. It is thus possible to provide repaired compressor or turbine drums matching the original component at low expense.

At a plurality of welding positions in an overlap portion of a plurality of members including a high-tensile steel sheet whose carbon content is 0.07 weight % or more, first beads (31 to 36) in a closed loop shape or a closed loop-like shape and second beads (41 to 46) in a closed loop shape or a closed loop-like shape on inner sides of the first bead (31 to 36) are formed by remote laser welding for joining. At this time, there are a procedure for successively forming the plural first beads (31 to 36) and a procedure for successively forming the plural second beads (41 to 46) for the plural formed first beads (31 to 36), and in both of the cases, the beads are each formed at a position except the closest welding position among the plural welding positions. Consequently, it is possible to enhance strength of a weld zone and to suppress welding deformation.

A method of manufacturing a semiconductor device includes forming a barrier metal film on a surface of at least one of a first electrode of a wiring board and a second electrode of a semiconductor element, providing a connection terminal between the first and second electrodes, the connection terminal being made of solder containing tin, bismuth and zinc, and bonding the connection terminal to the barrier metal film by heating the connection terminal and maintaining the temperature of the connection terminal at a constant temperature not lower than a melting point of the solder for a certain period of time.

Embodiments of an alloy that can be resistant to cracking. In some embodiments, the alloy can be advantageous for use as a hardfacing alloys, in both a diluted and undiluted state. Certain microstructural, thermodynamic, and performance criteria can be met by embodiments of the alloys that may make them advantageous for hardfacing.

A method of joining a first metal and a second metal is described. The first metal comprises Pb in an amount of at least 50 wt. % by weight of the first metal. The method comprises fusing the first metal and the second metal using non-consumable electrode arc welding.

An abrasive sheath for application to a component surface is disclosed. The abrasive sheath may comprise a metallic layer and an abrasive layer plated on a surface of the metallic layer. The abrasive layer may include a metal matrix and abrasive particles protruding from the matrix. An exposed surface of the metallic layer of the abrasive sheath may be joinable to the component surface by a heat treatment.

A turbine rotor for a supercharger includes a TiAl turbine wheel and a carbon steel shaft joined to each other via an Ni brazing filler metal at a brazed part distanced from a back face of the turbine wheel so that a turbine wheel outer diameter ratio calculated by a distance from the back face of the turbine wheel to the brazed part/an outer diameter of the turbine wheel is within a range of from 7 to 10%.

A tool includes a cemented carbide part and a maraging steel part, wherein the two parts are joined by brazing. The cemented carbide part has a hard phase embedded in a metallic binder phase matrix. The maraging steel part has a hardness of between 350 and 600 HV1 with a standard deviation between 0 and 20 HV1. A method of making such tool is also provided.

A composite material includes: an iron-based alloy layer; an intermediate layer provided on the iron-based alloy layer; and a tungsten-containing layer provided on the intermediate layer, wherein the intermediate layer is composed of pure nickel or is an alloy that contains at least one selected from a group consisting of copper, cobalt, and iron at more than 0 mass % and less than or equal to 71 mass % in total, and that contains nickel at more than or equal to 29 mass % and less than 100 mass %.

Provided is a connection element comprising a tubular first part with a first ring-shaped connection face for connection with a highly heat resistant steel pipe and a tubular second part with a second ring-shaped connection face for connection with a first ferritic steel pipe; wherein the first part is of a corrosion resistant steel material and wherein the second part is of a ferritic steel material; wherein the first and second parts are in one-piece and formed such that a passage between the first and second ring-shaped connection faces is formed; and wherein the first and second parts are produced by an additive manufacturing process. Further provided are a pipe arrangement and a heat exchanger.