介绍了铸铁焊接时产生气孔的各种原因,阐述了焊接区气孔发生的机理及其对策。指出了球铁虽然含碳量较高,但焊接时一般不发生气孔;而片状石墨铸铁焊接时产生气孔的主要原因是氧化物与C反应生成CO气体的缘故。 This paper introduces the various causes of porosity in cast iron welding, and expounds the mechanism of stomatal formation in welding zone and its countermeasures. It is pointed out that although the ductile iron has a high carbon content, the pores are not usually formed during the welding. The main reason for the porosity of the flaky graphite cast iron during welding is that the oxide reacts with C to form CO gas.