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由于球墨鑄鉄的各种特性,造成焊修困难。一方面因为球墨鑄鈇的凝固收縮比灰鑄铁大得多,使熔焊金屬产生很大的收縮应力而破裂;另一方面由于母体和焊条中都含有鎂,在熔焊时发生大量氧化鎂渣,而使兩种金屬熔液熔合困难。尤其是焊条金属含鎂和含硅量不容易控制,焊后的熔焊金屬往往因鎂损失太多而造成灰口,或因鎂量过多(或硅损太多)而造成白口,滿足不了球墨鑄铁所需要的机械性能,即不符合对球墨鑄鉄焊修的
Due to the various characteristics of ductile cast iron, resulting in difficult welding repair. On the one hand, because the solidification shrinkage of ductile castings is much larger than that of gray cast iron, the weld metal is greatly contracted and ruptured. On the other hand, due to the inclusion of magnesium in the matrix and welding rod, a large amount of magnesium oxide Slag, leaving two metal melt fusion difficult. In particular, the electrode metal containing magnesium and silicon is not easy to control the welding of the weld metal is often caused by excessive loss of magnesium caused by gray mouth, or because too much magnesium (or silicon loss too much) caused by white mouth, meet Can not ductile iron required mechanical properties, that does not meet the ductile cast 鉄 welding repair