For fillet welding of the steel where fire resistance is superior it is low hydrogen covered electrode

摘要

PURPOSE:To provide the coated electrode having an excellent high-temp. characteristic and welding workability at 600 deg.C by coating a steel core wire with a coating material consisting of a specific compsn. CONSTITUTION:The compsn. of the coating material is composed, by weight, of 5 to 30% SiO2, 15 to 35% TiO2, 5 to 30% MgCO3, 0.5 to 8% MgO, 10 to 45% iron powder, 1 to 10% Mn, 0.1 to 0.4% water of crystallization released by heating to =400 deg.C, 0.05 to 3% Ni, 0.02 to 0.1 % Nb, 0.5 to 4% Mo, 0.5 to 2.0% (0.5Mo+10Nb), and the balance slag forming agent, arc stabilizer, and binder. The steel core wire is coated with this coating material, by which the low hydrogen type coated electrode for fillet welding of steel having excellent refractoriness is obtd. This electrode has the excellent high-temp. characteristic and the good welding workability and allows the drastic reduction of the cost required for refractory application to a weld zone.