1. metallilise materjali põhimassi (üle 50 %) moodustav metall; 2. keevitatav või joodetav metall või sulam; ka peale keevitamist mittesulanud metall, 1. the metal present in the largest proportion in an alloy; 2. the metal to be welded, cut, brazed, soldered; 3. after welding, that part of the metal that was not melted