A flux (55) for superalloy laser welding and additive processing (20, 50), including constituents which decompose when heated in a laser induced plasma or to a melt temperature of the superalloy (42), creating one or more gases (46) that blanket the melt to protect it from air, while producing not more than 5 wt. % of slag relative to the weight of the flux. Embodiments may further include compounds providing one or more functions of surface cleaning, scavenging of impurities in the melt, and elemental additions to the superalloy.

A method and resulting gas turbine engine component (40) having a protective layer of metallic glass (14) deposited over a superalloy substrate (12). A further layer of ceramic insulating material (42) may be deposited over the metallic glass. The metallic glass functions as a bond coat to provide thermal insulation and mechanical compliance. The metallic glass may be deposited onto the substrate by a flux mediated laser deposition process wherein powdered alloy material (18) is melted together with powdered flux material (20). The flux material can facilitate the glass forming process by adding to the solidification confusion effect and/or by providing an active cooling effect.

The invention relates to a coated electrode comprising a central metal core being surrounded at least in part by an outer coating containing rutile and at least one lithium-based compound and being free of sodium feldspar and potassium feldspar. According to the invention, the electrode comprises at least one inner coating arranged between the outer coating and the central metal core, said inner coating containing at least one sodium-based compound and/or at least one potassium based compound. Associated process for welding stainless steel.

The system and method for tungsten inert gas (TIG) welding of thick plates (e.g. 10 mm or more) using a flux comprising a mixture of nanoparticle-sized oxides in a volume of nonevaporable sodium silicate (Na.sub.2xSiO.sub.2+x or (Na.sub.2O)x.Math.SiO) solvent. The nanoparticle-sized oxides may be Titanium oxide and Silicon oxide. The solvent may be at least one of sodium metasilicate (Na.sub.2SiO.sub.3), sodium orthosilicate (Na.sub.4SiO.sub.4), or sodium pyrosilicate (Na.sub.6Si.sub.2O.sub.7). Use of the flux provides for forming a weld having a cross-section having complete penetration to up to 14 mm using a current of about 300 A.

A braze coating material with a nickel core and a coating, a preparation method thereof, and a braze coating method are provided. The braze coating material with a nickel core and a coating requires no binder and has strong adhesion ability, and includes the nickel core, a coating layer, a hardened layer, and a protective layer sequentially from inside to outside. The nickel core is metallic nickel having a surface subjected to a roughening treatment. The coating layer is a first brazing flux layer including hard particles, a first brazing flux, and a brazing filler metal powder. The hardened layer contains a second brazing flux and is covered with the protective layer mainly composed of a silicate.

A flux-cored wire may be used with an ArCO.sub.2 mixed gas, the wire having a steel sheath filled with a flux. Such flux-cored wires may include, as a total of the steel sheath and the flux, relative to a total wire mass: Fe in 92 mass % or more, total Si in a 0.50 mass % or more and 1.50 mass % 15 or less, Mn in 1.00 mass % or more and 3.00 mass % or less, total Li in 0.010 mass % or more and 0.10 mass % or less, and total Mg in 0.02 mass % or more and less than 0.50 mass %, C in 0.15 mass % or less, P in 0.030 mass % or less, S in 0.030 mass % or less, and a slag forming agent in 0.50 mass % or less.

The present invention provides a bottom ohmic silver paste for strontium titanate ring varistor including silver powder, doped SnO.sub.2 micro powder, glass powder, organic solvent and organic binder, and the mass ratio of the silver powder, the doped SnO.sub.2 micro powder, the glass powder, the organic solvent and the organic binder is 65-85:0.9-4.3:0.5-5:10-20:10-15. The present invention also provides a preparation method and use of the bottom ohmic silver paste for strontium titanate ring varistor of the present invention.