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铸铁是工业上应用非常广泛的一种金属材料,但是这种材料的焊补却比较困难。由于铸铁焊补时存在有白口及淬硬、裂纹、加工性、熔合性等问题;还对焊补区与原母材应具有颜色相同等要求。因此,在灰口铸铁的焊补方法与工艺是多样的。讨论铸铁焊补工艺的分类,能更好地揭示铸铁焊补的本质,以便于焊工掌握铸铁的焊补技术。 1. 铸铁的热焊(包括半热焊) 铸铁的热焊具有如下特点: (1)铸件焊前需预热至600～700℃(半热焊预热至400℃),不仅有效地减少了焊件的温差,而且铸件处于高温,具有一定的塑
Cast iron is a widely used industrial metal material, but the welding of this material is more difficult. Due to the existence of cast iron welding white and hardened, crack, processing, welding and other issues; also welding the original base metal with the same color and other requirements. Therefore, in gray cast iron welding repair methods and processes are diverse. Discuss the classification of cast iron welding process, to better reveal the nature of cast iron welding, so that welder mastered the welding of cast iron technology. 1. Cast iron hot welding (including semi-hot welding) Cast iron hot welding has the following characteristics: (1) Before casting to be preheated to 600 ~ 700 ℃ (semi-hot welding preheated to 400 ℃), not only effectively reduce the Weldment temperature, and casting at high temperatures, with a certain plastic