Perfectionnements aux électrodes de soudure et au soudage de la fonte.

摘要

Spheroidal graphite cast iron is welded with an electrode having a mild steel core and a flux forming covering containing (in parts by weight of dry flux): .Calcium or barium carbonate.25-40 .Alkaline earth metal fluoride.15-30 .Carbon.15-30 .Silicon.3-6 .Rare earth metal and/or oxide.2-10 Up to 10 parts of strontium carbonate may also be present, the amount of alkaline earth metal carbonate being 25-50 parts by weight, any amount over 40 parts being strontium carbonate. Cerium oxide or cerium is the preferred rare earth and silicon is preferably present in the form of ferro silicon containing 25-60% silicon. Up to 6% of clay may be included. In an example a coating containing (in parts by weight): .Calcium carbonate.32 .Calcium fluoride.21 .Graphite.21 .Silicon (as ferro-50-silicon).4 .Cerium.6 .Strontium carbonate.4 .Bentonite.4 .Sodium silicate.15 .Invert sugar.2.5 .Water.5 was applied by extrusion and baked for two hours at 320 DEG C