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前言球墨铸铁是一种高强度材料,它含碳量高,又含有一定量的镁,所以焊接过程中容易在熔合区产生碳化物及在热影响区形成淬硬组织。为解决球铁焊接问题,遵循了下列一些原则:①改善焊接热循环,以减缓碳和镁在焊接过程中的不良影响;②采用强石墨化型的焊接材料,通过冶金过程,促使石墨析出,减少Fe_3C的形成;③采用具有抗球化衰退能力的钇基重稀土球化剂(这种球化剂可过量加入而不引起变态白口)。基于这种理论,研制了以钇基重稀土为球化剂的高碳高硅球墨铸铁焊丝
Introduction ductile iron is a high strength material, which contains high carbon content, but also contains a certain amount of magnesium, so the welding process is easy to produce carbides in the fusion zone and the formation of hardened tissue in the heat affected zone. To solve the problem of ductile iron welding, follow the following principles: ① improve the welding thermal cycle, to slow the carbon and magnesium in the welding process of the adverse effects; ② using strong graphitized welding materials, through the metallurgical process to promote graphite precipitation, Reduce the formation of Fe_3C; ③ the ability to use anti-nodular yttrium base rare earth nodulizer (this nodulizer can be added excessively without causing abnormal white mouth). Based on this theory, a high-carbon, high-silicon, ductile cast iron wire made of yttrium-based heavy rare earth