Métal d'apport pour la préparation de revêtements d'électrodes de soudage filées

摘要

A welding electrode has an unalloyed or low alloyed iron core and an extruded coating containing iron powder, the iron powder having a bulk factor before and after vibration of at most 26.5 and 24 c.c. respectively per 100 gm. and consisting to at least 90% of granular matter having a smooth and rounded surface. The grain size distribution is about 30% larger than 0.2 mm. 25% of 0.1-0.2 mm. and the balance less than 0.1 mm. At least 50% of the powder should have a spherical grain shape. The powder contains 0.5-5% chemically bound oxygen. Specified coating compositions are:- .(a).iron.65-85 parts ..ferromanganese.5-10 parts ..rutile.5-15 parts ..petalite.0-3 parts ..kaolin.0-2 parts ..potassium alginate.0.2-2-parts ..potassium water. ..glass (dry).3-6 parts and .(b).iron.65-85 parts ..ferromanganese.2-5 parts ..marble.5-10 parts ..fluorspar.2-6 parts ..quartz.0-5 parts ..bentonite.0-3 parts ..sodium alginate.0.2-2 parts ..potassium water. ..glass (dry).2-4 parts