在铸铁件修复过程中,有很多铸件要求焊后具有气密性,不漏水,不漏油。但由于铸铁含碳量较高,焊补时焊缝容易产生一氧化碳气孔,同时在熔合线附近,有时会产生少量的微裂纹,虽然不影响使用,但对铸件的气密性影响很大,使用时往往发生渗水渗油现象。我矿在1972年搞过一次气缸体气缸盖的焊补会战,会战后期 Cast iron repair process, there are many castings require welding with airtight, watertight, no oil leakage. However, due to the high carbon content of cast iron, weld seam easy to produce carbon monoxide pores, while near the weld line, and sometimes will produce a small amount of micro-cracks, although not affect the use, but the impact on the tightness of castings, the use of Water seepage occurs often when the phenomenon. I mine engaged in a cylinder block cylinder head welding repair battle in 1972, the latter part of the battle