A flux-cored wire may be used with an Ar—CO.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.

A method of removing contaminants from a surface of a gas turbine engine component protected by a diffusion coating that comprises an additive layer on the surface of the component and a diffusion zone in the surface of the component. The method includes subjecting the surface containing contaminants to laser beam pulses to remove contaminants from the component such that contaminants on the surface of the component are removed without damaging or removing the diffusion zone of the diffusion coating. Methods for controlled removal of at least a portion of a thickness of a diffusion coating from a coated superalloy component are also provided.

A flux for submerged arc welding is a sintered flux and is for use in high speed welding. In the flux, the following relationships of contents in mass percent are satisfied: CaF.sub.2: 10.0% to 20.0%, MgO: 8.0% to 15.0%, a sum of Na.sub.2O and K.sub.2O: 2.1% to 3.5%, MnO: 1.5% to 5.0%, FeO: 0.5% to 5.0%, SiO.sub.2: 10.0% to 20.0%, Al.sub.2O.sub.3: 13.0% to 28.0%, and TiO.sub.2: 13.0% to 28.0%. In addition, the following relationships are further satisfied: 65≤(MgO+SiO.sub.2+Al.sub.2O.sub.3+TiO.sub.2)≤75, and 0.5≤(Al.sub.2O.sub.3/TiO.sub.2)≤2.0.

A method for the manufacture of a welded joint including the following successive steps: I. The provision of at least two metallic substrates wherein at least one metallic substrate is a steel substrate, and II. The welding of the at least two metallic substrates with a welding head while, simultaneously, applying on the at least two metallic substrates, ahead of the welding head, a welding flux including a titanate and a nanoparticulate oxide selected from the group consisting of TiO.sub.2, SiO.sub.2, ZrO.sub.2, Y.sub.2O.sub.3, Al.sub.2O.sub.3, MoO.sub.3, CrO.sub.3, CeO.sub.2, La.sub.2O.sub.3 and mixtures thereof.

The present disclosure relates to tubular welding electrodes that have a metallic sheath surrounding a granular core, wherein the metallic sheath comprises a metal matrix composite (MMC) that includes a ceramic material and aluminum or an aluminum alloy. The ceramic material may be in the form of microparticles or nanoparticles. The present disclosure also relates to method for making such tubular welding electrodes.

A self-shielded flux-cored welding wire with a special protective slag coating formed in situ and a manufacture method thereof. The self-shielded flux-cored welding wire includes a low-carbon steel belt and a flux core powder, the flux core powder is filled in the low-carbon steel belt, the flux core powder includes the following ingredients in percentage by mass: 60-80% glass powder, 2-8% zirconium oxide powder, 0.05-0.85% graphene powder, 2-8% potassium carbonate sodium powder, 1-3% potassium titanate powder, 2-5% rutile powder, 1-5% corundum powder, 1-3% sodium fluorosilicate powder, and the balance of iron powder, and a weight of the flux core powder accounts for 13-25% of a total weight of the welding wire.

An austenitic-ferritic stainless steel welding material, comprising in weight %: C: <0.02 Si: <0.45 Mn: 1.60-2.05 P: <0.03 S: <0.03 Cr: 18.5-25 Ni: 8.5-10.5 Mo: <0.75 10 Co: <0.2 Cu: <0.75 N: 0.12-0.3 the balance being Fe and incidental impurities.

Flowable brazing compositions and methods of brazing metal articles together using the same are provided herein. In an embodiment, a flowable brazing composition includes a non-polymeric carrier medium and flux-coated particles. The carrier medium includes at least one polar organic solvent and is liquid at ambient temperature. The flux-coated particles include a braze material core and a flux coating disposed on the core. The braze material core includes different material from the flux coating. The flowable brazing composition has less than or equal to about 1.5 weight % of polymeric binder components, based upon a total weight of the flowable brazing composition.

A process for brazing of aluminium magnesium alloys is described applying a flux which comprises KAlF.sub.4 or CsAlF.sub.4 or both as major constituent. The flux further comprises at least one alkaline or alkaline earth metal compound selected from the group consisting of KAlF.sub.4, CsAlF.sub.4, Li.sub.3AlF.sub.6, CaF.sub.2, CaCO.sub.3, MgF.sub.2, MgCO.sub.3, SrF.sub.2, SrCO.sub.3, BaF.sub.2, and BaCO.sub.3. Preferably the flux comprises or consists of KAlF.sub.4, CsAlF.sub.4, and Li.sub.3AlF.sub.6 and optionally contains also BaF.sub.2.

A flux-cored wire for gas-shielded arc welding has a steel outer sheath filled with a flux. The flux-cored wire includes specific amounts, relative to a total mass of the wire, of TiO.sub.2, at least one of Si, an Si oxide and an Si compound, C, Mn, Mo, Ni, at least one of metal Mg and an Mg alloy, an F compound, a K compound, an Na compound, B and a B compound, and Fe, respectively. A total content of each of Ti and a Ti alloy, metal Al and an Al alloy, and V is restricted to the specific range, respectively. A content of Ti is also restricted to the specific range relative to the total mass of the steel outer sheath.