An assembly including a ceramic body. The assembly comprises a tungsten coupling attached to the ceramic body with a first joint that forms a first helium tight seal between the ceramic body and the tungsten coupling and where the first helium tight seal maintains its integrity at a temperature over 400 C. The assembly includes a metal body attached to the tungsten coupling with a second joint that forms a second helium tight seal between the metal body and the tungsten coupling and where the second helium tight seal maintains its integrity at a temperature over 400 C. A method. A mixture. A coupling.

A flux-cored wire for gas-shielded arc welding, including, in terms of mass % relative to a total mass of the wire, in the total of the steel outer sheath and the flux, C: 0.03 to 0.08%, Si: 0.1 to 0.6%, Mn: 1.5 to 2.8%, Cu: 0.01 to 0.5%, Ni: 0.35 to 0.98%, Ti: 0.05 to 0.25%, and B: 0.002 to 0.015%, Al: 0.05% or less, and including, in the flux, TiO.sub.2 conversion value: 3 to 8%, Al.sub.2O.sub.3 conversion value: 0.1 to 0.6%, SiO.sub.2 conversion value: 0.2 to 1.0%, ZrO.sub.2 conversion value: 0.20 to 0.65%, Mg: 0.2 to 0.8%, F conversion value: 0.05 to 0.25%, Na conversion value: 0.02 to 0.10%, and K conversion value: 0.05 to 0.20%.

A flux-cored wire for gas-shielded arc welding in which a steel sheath is filled with flux and the flux-cored wire contains Fe, C, Mn, Cr, Ni, Mo, Nb, V, P, and S within controlled amounts, and further contains, with respect to the total mass of the wire, TiO.sub.2: 3.0 mass % or more and 9.0 mass % or less, a SiO.sub.2 conversion value of metal Si and a Si compound: 0.5 mass % or more and 1.5 mass % or less, Co: 0.10 mass % or more and 1.50 mass % or less, N: 0.015 mass % or more and 0.060 mass % or less, Li: 0.11 mass % or less, Mg: 0.85 mass % or less, and a total amount of K and Na: 0.3 mass % or less.

An ultra high-strength flux-cored arc welded joint having excellent impact toughness comprises: 0.01 wt % to 0.06 wt % of carbon (C), 0.1 wt % to 0.5 wt % of silicon (Si), 1.5 wt % to 3.0 wt % of manganese (Mn), 2.5 wt % to 3.5 wt % of nickel (Ni), 0.5 wt % to 1.0 wt % of molybdenum (Mo), 0.4 wt % to 1.0 wt % of copper (Cu), 0.4 wt % to 1.0 wt % of chromium (Cr), 0.01 wt % to 0.1 wt % of titanium (Ti), 0.003 wt % to 0.007 wt % of boron (B), 0.001 wt % to 0.006 wt % of nitrogen (N), 0.02 wt % (excluding 0) or less of phosphorus (P), 0.01 wt % (excluding 0) or less of sulfur (S), 0.03 wt % to 0.07 wt % of oxygen (O), and remaining iron (Fe) as well as unavoidable impurities.

The invention described herein pertains generally to boric acid free flux composition wherein in some embodiments, a phthalocyanine pigment is used to effect a color change at activation temperature.

The present invention concerns a process for the manufacture of flux compositions, flux compositions obtainable by the process according to the invention, aluminum or aluminum alloy parts at least partially coated with the flux composition manufactured by the process, and a brazing process and brazed metal object obtainable by said process.

One or more techniques and/or systems are disclosed for an agglomerated welding flux that can comprise, as expressed in % by weight of flux: 25 to 35% MgO, 20 to 28% CaF.sub.2, 15 to 22% Al.sub.2O.sub.3, 12 to 17% SiO.sub.2, and 0,2 to 0,4% carbon (% by weight). The carbon can be introduced using at least one metallic compound contained in the flux. Further disclosed is a process for submerged-arc welding of at least one workpiece made of austenitic stainless steel, using the described flux. Additionally disclosed is a welded joint that can comprise 17 to 20% Cr, 5 to 8,5% Mn, and 14 to 18% Ni, which can be obtained using the described process.

A metal-cored wire for submerged arc welding having a composition including, in mass %: C: 0.20 to 0.80%, Si: 0.15 to 0.90%, Mn: 17.0 to 28.0%, P: 0.030% or less, S: 0.030% or less, Ni: 0.01 to 10.00%, Cr: 0.4 to 4.0%, Mo: 3.50 to 10.00%, B: 0.0010% or less, N: 0.200% or less, and the balance being Fe and incidental impurities.

The present invention provides the following: a covered flux which has a low chromium content and which can improve the fatigue strength of a weld in additional welding; and a covered electrode. The covered flux used for a covered electrode has a composition that contains, relative to the total mass of the covered flux, 35-55 mass % of a metal carbonate (in terms of CO2), 10-30 mass % of a metal fluoride (in terms of F), and 8.5-20 mass % of Mn and/or 7.5-20 mass % of Ni. In addition, the covered electrode is obtained by coating an iron-based core wire with this covered flux.

A flux fluid is disclosed for use in manufacturing a heat exchanger (4) by brazing and joining an aluminum tube (3) and an aluminum fin (2). The flux fluid (101) contains a fluoride-based flux, colloidal silica, and a dispersion medium. The mass ratio of the colloidal silica with respect to the fluoride-based flux is 1/200 to 1/15.