enveloped welding electrode of the rutile type with steel core wire

摘要

An arc-welding electrode consists of a core wire of mild steel or low alloy steel coated with a composition having a low hydrogen content and containing, by weight, .Titania.30-60% .Limestone.10-40% .Fluorspar.0-10% and Ferro-alloys totalling not less than 5% and chosen from .Ferro-manganese.0-15% .Ferro-silicon.0-15% .Ferro-aluminium.0-10% and .Ferro-titanium.0-10% the electrode having been baked at a temperature of at least 300 DEG C. If iron powder is incorporated, the coating may be composed of .Titania.30-50% .Limestone.20-40% .Fluorspar.0-10% .Iron powder.20-50% and Ferro-alloys totalling not less than 5% and chosen from .Ferro-manganese.0-10% .Ferro-silicon.0-15% and .Ferro-aluminium.0-10% A composition given by way of example also contains ferro-chromium and ferro-molybdenum and is coated on to a mild steel core wire for welding a low alloy steel containing Cr 1% and Mo 0.5%. The compositions may be compounded with alkali silicates and extruded as pastes on to the core wires.