一、当前铸铁焊补上的两个大难题 第一、“变质”铸铁件的焊接。 1.什么叫“变质”铸铁,这个概念切不同能铸造上的“变质”概念相混。在焊接技术上,铸铁的,“变质”是指:“有些铸铁,如长期在高温,水蒸汽下工作的炉篦、锅等,因铸件中的碳(石墨)已被烧损、铸件具多孔性,变得松脆,故这类铸件实际上是无法焊补的”这是朱(?) First, the current cast iron welding up two big problems first, “metamorphic” cast iron welding. 1. What is “metamorphic” cast iron, the concept of different cut can be cast on the “metamorphic” concept mixed. In welding technology, cast iron, “metamorphic” means: “Some cast iron, such as long-term high temperature, water vapor under the work of grate, pot, etc., because the casting of carbon (graphite) has been burned, casting porous Sex, become crisp, so this type of casting is actually not welding repair ”This is Zhu (?)