我厂生产汽车底盘部分铸件近二百多个品种,球墨铸铁件占94％,1984年产量近四万吨。由于球墨铸铁具有良好的铸造性能和机械性能等优点,在工业上获得了日益广泛的应用。但是,铸造生产过程中不可避免地会出现渣孔、缩孔、砂眼和缺肉等缺陷,约有50～60％可以修复。若采用焊补的方法修复,设备简单,操作方便,经济效益高。为了保证焊补质量,减少铸件废品,提高铸件成品率,长期以来我们一直采用价格昂贵的镍基焊条修复铸件。由于材质上的差异,使焊后铸件常出现焊缝硬度高,而引起加工时打刀,致使许多铸件不论其缺陷大小和部位,一律不允许焊补而报废,造成极大的浪费。 I plant part of the production of automotive chassis casting nearly 200 varieties, ductile iron pieces accounted for 94% 1984 production nearly 40,000 tons. Due to the advantages of ductile cast iron, such as good castability and mechanical properties, ductile iron has gained an increasingly wide range of applications in industry. However, defects such as slag holes, shrinkage holes, blisters and missing meat are inevitable in the casting process, and about 50 to 60% can be repaired. If using welding repair method, the device is simple, easy to operate, high economic efficiency. In order to ensure welding quality, reduce casting waste, improve casting yield, for a long time we have been using expensive nickel-based welding rod repair castings. Due to material differences, so that the weld often appears after the high hardness of the weld, which led to the processing of the knife, resulting in many castings, regardless of the size and location of defects, will not allow welding and scrapped, resulting in great waste.