| 摘要 |
<p>1451921 Welding by fusion CENTRE DE RECHERCHES DE PONT A MOUSSON 3 Aug 1973 [3 Aug 1972] 34922/73 Heading B3R [Also in Division C7] In a process for heterogeneous fusion welding of parts of non-alloyed, lamellar nodular or spheroidal graphite cast iron, using a filler of an Fe-Ni or Fe-Ni-Co alloy, the weld deposit comprises the balance, apart from impurities and traces of deoxidizing agents (e.g. the residue from addition to the filler material of up to 5% of Al, Si, Ti, Zr or rare earth metals) being Fe. 30% of the nickel content may be replaced by Co. Exemplary filler material are: (a) an electrode comprising a core of ferro-nickel containing 50-60% Ni coated with a composition comprising 30-50% Ba or Ca carbonate, 10-15% CaF 2 , 0-5% iron oxide, 25-35% Fe powder, 5-15% C, small amounts of alkali metal silicate binder and 0-5% deoxidizing agent; (b) an electrode comprises a mild steel core coated with a composition comprising 25-40% Ba or Ca carbonate, 5-15% CaF 2 , 0-5% iron oxide, 40-60% Ni powder (30% of which may be replaced by Co), 10-30% C, small amounts of alkali metal silicate binder and 0-5% deoxidizing agent; and (c) a wound mild steel ribbon (60-65% of the filler) containing 35-40% powdered Ni, 0À15-3% graphite powder and 0-5% deoxidizing agent. The last example must be welded under a solid flux or a neutral protecting gas.</p> |
