铸铁的焊接最容易产生裂缝和形成硬度高、脆性大的白口组织,以致焊后不能进行机械加工。为了防止达些缺陷,国外常用铜镍合金和高硅铸铁焊芯等优质焊条,并且在焊接前要对铸件进行预热,这样就使得铸铁的焊接工艺大大复杂化了。我厂制造的铜芯铸铁焊条是用普 Cast iron welding most likely to produce cracks and the formation of high hardness, large white brittle tissue, so that after welding can not be machined. In order to prevent some defects, foreign high-quality welding electrodes such as copper-nickel alloy and high-silicon cast iron are commonly used, and the castings are preheated before welding, thus greatly complicating the welding process of cast iron. I plant the manufacture of copper cast iron electrode is Pu