铸铁是一种可焊性很差的材料,焊接时焊接接头容易出现白口组织和裂缝等。焊补铸铁一般采用热焊、低温热焊和冷焊等方法。热焊一般可以保证焊补质量,但工件需加热至600～700℃或400℃左右,工件变形大、劳动条件差、生产率很低。采用手工电弧冷焊时,熔合区白口层一般比较厚,难以 Cast iron is a poor weldability of materials, welding joints prone to white tissue and cracks and so on. Welding cast iron generally use hot welding, low temperature welding and cold welding and other methods. Hot welding can generally ensure welding quality, but the workpiece to be heated to 600 ~ 700 ℃ or 400 ℃, the workpiece deformation, poor working conditions, low productivity. Cold arc welding by hand, the fusion zone white stratum generally thicker and harder