GB709533A - Process and apparatus for arc welding metal - Google Patents

Abstract

709,533. Uniting by fusion. UNION CARBIDE & CARBON CORPORATION. Feb. 4. 1952 [Feb. 10, 1951 ; May 29, 1951 ; Sept. 26, 1951]. No. 2851/52. Class 83 (4) In a gas-shielded arc welding process, using a fuzible electrode, particularly for aluminium, aluminium alloys, stainless steels, high temperature alloys, low alloy steels, nickel, nickel steels and carbon steels, the shielding gas contains from ¢ per cent to 10 per cent by volume of oxygen, the balance being essentially argon. Argon from a container 30 and oxygen from a container 36 are supplied through a mixer 26 to the arc 10. The electrode 12, of metal similar to the work 14, is fed by a roll 46 driven by a motor 48 which may be automatically responsive to variations in welding voltage to keep the arc length constant. In a modification, Fig. 2 (not shown), an argonoxygen mixture is supplied from a cylinder to a hard welding gun for overhead welding, the electrode being fed by motor-driven rolls at a rate controlled automatically by voltage control means which keeps the arc voltage within Œ 0.5 volts of a selected value. The shielding gas mixture preferably contains less than 9 grains of water vapour per 1000 cu ft. of gas, and either reversed or straight polarity welding is effected. Examples are given of rate of electrode feed, ratio of oxygen to argon, &c., in particular applications.