METHOD FOR JOINING SPHEROIDAL GRAPHITE CAST IRON MATERIAL AND STAINLESS STEEL MATERIAL

摘要

PURPOSE:To improve productivity and to reduce costs by welding the above cast iron material and stainless steel material by a welding wire which contains specific weight% of C, Si, Mn, Ni, Cr, etc., and consists of the balance Fe, then heating and holding the materials for a specific period of time to and at a specific temp., and air cooling the materials. CONSTITUTION:The spheroidal graphite cast iron material having a ferrite base and the ferritic stainless steel material are welded. These materials are then subjected to gas shielded arc welding by the welding wire of the austenite base consisting, by weight%, of =0.15% C, =1.00% Si, =3.5% Mn, =0.03% P and S, 50 to 80% Ni, 11 to 32% Cr, and the balance Fe. After both materials are welded, the materials are heated and held for =10 minutes to and at 650 to 1000 deg.C and are then air cooled. The heat treating time is reduced in this way and the breaking strength of the weld zone is increased.