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球墨铸铁的焊接主要用于铸件缺陷的修复。高含碳量要求采取特殊措施,以降低焊接应力与接头的淬硬程度。非铁素体球墨铸铁一般在焊前要预热,而珠光体则要求退火。焊球墨铸铁使用镍与铜基合金,也用成分与被焊件相同的球铁棒。在CO_2与Ar气体保护中焊接,采用纯镍,蒙乃尔及含55％Ni的FeNi合金,以及S-SnBz和S-AlBz青铜。为避免裂缝,焊前预热到200～260℃,并选用热输入量
Ductile iron welding is mainly used for casting defects repair. High carbon content requires special measures to reduce weld stress and the hardenability of the joint. Non ferritic ductile iron is generally preheated before welding, while pearlite requires annealing. Nodular graphite cast iron uses nickel and copper-based alloys, but also with the same composition and the pieces to be welded ductile iron. In CO 2 and Ar gas protection welding, the use of pure nickel, Monel and 55% Ni FeNi alloy, and S-SnBz and S-AlBz bronze. To avoid cracks, preheat to 200 ~ 260 ℃ before welding, and select the heat input