由于铸铁的含碳量和含硅量比较高(分别为2～4.5％和0.5～3％),在焊接的特殊冶金过程中,有加热速度快、高温停留时间短和冷却速度快等弱点,影响焊接的效能。这在铸铁电弧冷补焊时,尤为突出。因此,在焊补铸铁件时,只有采用妥善措施(如:预热、小规范焊接、焊后立即锤击焊肉,以及焊后保温、缓冷等工艺措施),才能获得良好的焊接接头;否则,在近焊缝处会产生白口组织、裂纹等缺陷,导致焊补失败。氧乙炔火焰金属粉末喷焊工艺,近年来在我国工业部门,特别是在机械零件的修复、维护上已获得较为广泛的应用。这种喷焊工艺,与其它焊接工艺相比,具有设备简单、操作方便、运用灵活、维修容易、节约 Due to the high carbon content and silicon content of cast iron (2 ~ 4.5% and 0.5 ~ 3% respectively), in the special metallurgy process of welding, there are weaknesses such as fast heating, short residence time at high temperature and fast cooling, Affect the welding performance. This cast iron arc cold welding, especially prominent. Therefore, when welding cast iron, good welding joints can be obtained only by proper measures (such as preheating, small-scale welding, hammering of welding meat immediately after welding, and post-weld heat preservation and slow cooling process measures) Otherwise, near the weld will have white tissue, cracks and other defects, leading to welding failure. Oxyacetylene flame metal powder spray welding process, in recent years in China’s industrial sector, especially in the repair of mechanical parts, maintenance has been more widely used. This spray welding process, compared with other welding processes, with equipment is simple, easy to operate, flexible use, easy maintenance, saving