| abstract |
An arc welding electrode has a core containing 15-45 copper, 0-10 iron, 1-4 aluminium, 0.3-3 titanium, less than 0.12 carbon, 0-8 manganese, 0-1.5 silicon, 0-2.5 niobium, 0-5 cobalt, the balance at least 50% being nickel apart from impurities and conventional deoxidizers, e.g. 0.022 magnesium, and a flux coating containing 10-80 manganese carbonate, 0-40 alkaline earth metal carbonate, the total carbonate being 10-80, 10-35 titanium dioxide, 5-30 cryolite and a binder, and optionally manganese silicon or niobium, the electrode as a whole containing 0.5-7 manganese, 0.1-1.3 silicon and 0-4 columbium. The metals present in the coating may be manganese up to 20, silicon up to 2.4 and niobium (including incidental tantalum) up to 9. The silicon may be in the form of an alloy containing 0.5-1.5 calcium, 25-35 silicon, balance nickel and the niobium may be added as ferroniobium. The other coating constituents specified are 2-5, bentonite or other colloidal clay, alginates, gums, glycolates and sodium carboxymethyl cellulose. The coating is extruded and baked at 600 DEG F. or two hours. The coating is 25-35% of the total weight of the electrode. Weld deposits produced by such electrodes have the composition 15-45 copper, 0-40 iron, 0.5-8 manganese, 0.1-1.3 silicon, 0-1.5 titanium, 0-1.5 aluminium, 0-4 niobium, 0-0.08 carbon, balance nickel. The Specification describes specific examples of electrodes, weld deposits and workpieces. All the above quantities are percentages by weight. |