球墨铸铁比普通铸铁易于产生铸造缺陷,但由于焊修工艺没有很好掌握,因而过去每遇配件发现铸造缺陷或在运用中发生裂损时,大多报废,造成很大损失.因此如何焊修球墨铸铁缺陷是一个急待解决的问题. 在球墨铸铁焊修技术上首先要解决的问题可以归纳为下列几点: ①保证焊道石墨球化良好; ②消除焊道和焊道与母材交界处的白口组织; ③消除焊道针孔. 我厂从1955年起开始进行球墨铸铁焊补试验工作,虽然在焊道的组织、性能与母材一致方面取得了一些成果,但是关于焊道针孔的消除问题,一直到1964年经过多次试验才得到解决.焊道针孔问题解决 Ductile iron casting defects than ordinary cast iron prone to, but due to the welding repair process is not well understood, so in the past found each casting found defects or cracks in use, mostly scrapped, resulting in great loss. Cast iron defects is an urgent problem to be solved in the art of ductile iron welding the first to solve the problems can be summarized as follows: ① to ensure good ball graphite ball; ② eliminate weld and weld bead and the base metal junction Of the white mouth organization; ③ elimination of weld pinhole. I plant from 1955 onwards ductile iron welding repair work, although the organization of the weld, the performance and consistent with the base metal has made some achievements, but on the weld pin The problem of eliminating holes was not solved until many times in 1964. Solder pinholes were solved