A solid wire for electroslag welding, including Fe and, by mass % based on a total mass of the wire: C: more than 0% and 0.03% or less; Si: more than 0% and 0.10% or less; Mn: more than 0% and 0.25% or less; Ni: 10.5%-14.0%; S: more than 0% and 0.010% or less; Al: more than 0% and 0.250% or less; REM: 0.002%-0.080%; and O: more than 0% and 0.0090% or less.

Novel High-Entropy Alloy (HEA) compositions are particularly suited to welding applications. The mixtures contain at least the elements nickel, manganese, cobalt, chromium, vanadium, molybdenum, and iron. The % weight of the constituents varies in accordance with the detailed description contained herein, with tolerances in the range of ±4% for major alloying elements and ±1% for minor alloying elements. The mixture may also contain a small amount of Aluminum, Titanium, and Boron with a tolerance in the range of +/−1% or, more preferably, +/−0.5% In accordance with the invention, the compositions above may be integrated into HEA welding products using cored wire and welding electrode manufacturing techniques, preferably starting with vacuum melted rolled alloys. One manufacturing process uses the compositions as an alloyed strip formed around the appropriate ground/crushed alloys to make commercially viable fabricated welding products.

A method for welding coated steel sheets, particularly steel sheets that are coated with an aluminum-silicon metallic coating layer, is provided. A configuration of two laser beams is provided, wherein the laser beams act on a weld pool that is to be formed, at least one laser beam rotates around a rotation axis so that the laser beams execute a movement relative to each other, and the laser beams are guided along a welding axis. In order to achieve a mixing of the weld pool, a defined stirring effect and a defined welding speed in relation to each other are adhered to, wherein a mathematically defined condition applies to the stirring effect.

A sputtering target-backing plate assembly obtained by bonding a sputtering target and a backing plate using a brazing material, wherein a braze bonding layer which bonds the sputtering target and the backing plate contains a material having thermal conductivity that is higher than that of the brazing material in an amount of 5 vol % or more and 50 vol % or less, and a thickness of the braze bonding layer is 100 μm or more and 700 μm or less. An object is to prevent the seepage of the brazing material while maintaining the thickness of the braze bonding layer.

A MIG welding method for carbon steels using an Ar shielding gas. The method includes short-circuiting a welding wire and a base material. The average short-circuiting frequency in welding is 20 Hz to 300 Hz and the maximum short-circuiting period is 1.5 s or less.

Disclosed herein are compositions, methods, and systems for resistance spot welding or brazing an aluminum member to a steel member using a chromium layer disposed between the aluminum member and the steel member.

An additively manufactured object formed by depositing weld bead layers, each of the weld bead layers being obtained by melting and solidifying a filler metal made of a mild steel, the additively manufactured object includes a plurality of the weld bead layers having a ferrite phase with an average grain diameter of 11 μm or less in a part except for a surface oxide film.

A method for making a bonded metal piece, including (a) obtaining a first piece of stock metal comprising a first surface and a second piece of the stock metal comprising a second surface; (b) smoothing the first surface so as to form a first contact surface and smoothing the second surface so as to form a second contact surface; (c) cleaning the first contact surface and the second contact surface; (d) loading the first piece and the second piece into a furnace; and (e) bonding the first piece to the second piece so as to form a bonded metal piece comprising the first contact surface diffusion bonded to the second contact surface. The bonding includes (i) heating the first piece and the second piece to a temperature below a superplastic forming temperature of the stock metal; and (ii) applying a pressure comprising pressing the first contact surface and the second contact surface together while the first piece and the second piece are at the temperature. In one or more examples, the bonded metal piece is machined (without forging or working into shape) into an aircraft part.

Provided is a solder composition including a flux, a solder alloy, and a silicone oil. The solder composition can have a kinematic viscosity at 25° C. of 5000 mm.sup.2/s or more and 200,000 mm.sup.2/s or less. The silicone oil can be at least one member selected from the group consisting of dimethyl silicone oil, methylphenyl silicone oil, methylhydrogen silicone oil, reactive silicone oil, and non-reactive silicone oil.

A preferable aspect of the present invention provides a hot-rolled steel sheet with excellent low-temperature toughness, a steel pipe using the same, and a manufacturing method therefor, wherein the hot-rolled steel sheet contains, by weight, 0.35-0.65% C, 0.01-0.4% Si, 13-26% Mn, 0.01-0.3% Ti, 0.01% or less B, 4% or less Al, 1-6% Cr, 0.05% or less P, 0.02% or less S, 0.01% or less N, 0.01-2% Cu, 0.001-0.015% Nb, and the balance Fe and other unavoidable impurities, the alloy elements satisfying the following relational formulas—[Relational formula 1] 70<[10*(C/12)+(Mn/55)+(Al/27)]*100<95 and [Relational formula 2] 4<100*(Cr/52+100*(Nb/93))<9; wherein a microstructure comprises, by area fraction, 97% or more (including 100%) of austenite and 3% or less (including 0%) of a carbide, the crystal grain size of the austenite being 18-30 μm or less; and wherein the size of the carbide is 0.5 μm or less.