1.球墨铸铁割除部分(吹去渣滓的地方),应清除坚硬表皮,开坡口是有效办法之一,以便渣滓能顺利被气流吹去(予热面可清理杂质,不必开坡口)。2.尽量采用能率大的氧—乙炔焰进行予热,火焰性质应稍取氧化焰,以使予热面之表皮能够强烈氧化,热量能有效的传递。3.从割除部分的边缘开始予热,等边缘形成熔潭放出火花时,再喷出高压纯氧射 1. Ductile iron cutting part (blow away the garbage), should be removed hard skin, beveling is one of the effective ways, so that the dregs can be blown away by the air (to the hot surface can be cleaned of impurities, do not have to groove). 2. Try to use a large rate of oxygen - acetylene flame to preheat the flame nature of the flame should be slightly, so that the surface of the skin can be intense oxidation, heat can effectively pass. 3. From the cut-off part of the edge of the beginning to heat, such as the formation of pools melt sparks, and then emit high-pressure pure oxygen