由于铸铁件的可焊性差,焊接时易产生白口和裂缝。目前,在实际生产中,对铸件的补焊比较成熟的有热焊法和镍基焊条的冷焊法,但焊接工艺复杂,焊条昂贵。为此,我们对常用的农业机械中非承受拉应力体积较大的零部件,如柴油机体、水泵壳体、水管等铸件,采用了低碳钢焊条进行水冷法补焊,已应用推广达六年之久,合格率达80％以上。这种新工艺具有操作简单,成本低,节 Due to the poor weldability of cast iron, welding and easy to produce white mouth and cracks. At present, in actual production, the welding of the castings is relatively mature with the hot welding method and the cold welding method of the nickel-based welding rod, but the welding process is complicated and the welding rod is expensive. To this end, we commonly used agricultural machinery in the non-tensile stress larger components, such as diesel engine, pump housing, water pipes and other castings, the use of low carbon steel electrode for water-cooled welding repair, has been applied to promote the six Years, the pass rate of 80% or more. This new process has simple operation, low cost, section