Nickel-base welding electrode

Abstract

A nickel-base welding electrode is provided comprising a nickel core and a metallic powder-laden flux coating bonded thereto, the total composition of the electrode comprising about 40% to 50% by weight of the nickel core and about 60% to 50% by weight of the coating. The coating contains as fluxes about 18% to 30% titanium dioxide, about 8% to 16% calcium fluoride, about 1% to 3% iron carbonate, about 1.5% to 4% calcium carbonate, about 2% to 6% calcium-magnesium carbonate, and contains as the powdered metals about 20% to 30% chromium, about 3% to 8% manganese, about 1% to 4% molybdenum, about 1% to 5% niobium, about 8% to 18% iron, 0% to about 6% nickel, up to 1% graphite, and as extrusion aids about 1% to 4% clay and about 1% to 5% organic extrusion aid material. The flux in the coating is mixed with a bonding agent at a ratio of dry flux to bonding agent of about 5:1 to 10:1, the composition of the bonding agent being about 2% to 10% potassium carbonate, about 40% to 70% potassium silicate, about 1% to 6% potassium hydroxide, about 20% to 35% sodium silicate and 0 to about 15% water. The composition relationship of the metal powder in the flux to the nickel core is such as to provide a weld deposit, taking into account metal losses due to oxidation, containing less than about 0.25% C, about 10% to 20% chromium, about 5% to 12% iron, about 0.5% to 2.5% niobium, up to about 1% silicon, about 2% to 5% manganese, up to about 5% molybdenum and the balance essentially nickel.