球墨鑄铁的可焊性比灰口鑄铁差,但焊接处的机械性能要求却較高,用其他焊条来焊接球墨鑄铁件,效果都不好。为了解决这个問題和填补国产焊条的空白,我厂近年来試制成功一种镍铁合金焊条(牌号:上焊75),是目前焊补灰口鑄铁和球墨鑄铁件最优质的焊接材料。这种材料用鎳53～60％、铁40～47％的合金作为焊芯,有良好的耐裂性能和切削性能。 Ductile iron weldability worse than gray cast iron, but the mechanical properties of the weld is higher, with other welding electrodes to the ductile iron, the effect is not good. In order to solve this problem and fill the gap of domestic welding rod, our factory has succeeded in producing a kind of nickel-iron alloy electrode (grade 75) on trial production in recent years. It is the best welding material for welding gray cast iron and ductile iron. This material with nickel 53 ~ 60%, 40 ~ 47% iron alloy as the core, good resistance to cracking and cutting performance.