用低碳钢焊条(结422或结423)水浸冷焊修理东方红—75、54发动机壳体、缸盖、后桥壳体等,效果较好。这种焊接方法的特点是:设备简单,焊条供应充足,容易掌握,施焊条件好,劳动强度低,焊接质量较好。铸铁焊补时,经常遇到产生裂纹和白口组织等缺陷,而用这种方法大大降低了产生裂纹的可能性,焊后可进行机械加工。因此,在农村人民公社生产队的机修站,只要有交流电焊机就可进行铸 Low carbon steel electrode (junction 422 or junction 423) cold water welding repair Dongfanghong -75,54 engine shell, cylinder head, rear axle housing, the better. This welding method is characterized by: simple equipment, adequate supply of electrodes, easy to grasp, good welding conditions, low labor intensity, welding quality is better. Cast iron welding often encountered defects such as cracks and whiteheads, and in this way greatly reduce the possibility of cracks, after welding can be machined. Therefore, in the rural people’s commune production team’s mechanic station, as long as the AC welder can be cast