球墨铸铁件(以下简称球铁件)在铸造和使用过程中总是不可避免地要出现各种缺陷。由于球铁是一种脆性材料含碳量高,又含有一定量的镁,在焊接过程中容易促使熔合区产生白口组织及在热影响区形成淬硬组织。为此,我们采取改善气焊热循环的工艺措施;采用强石墨化型的焊接材料来焊修球铁废件。在强石墨 Nodular cast iron (hereinafter referred to as ductile iron pieces) in the casting and use of the process is always inevitable to be a variety of defects. As ductile iron is a brittle material with high carbon content, but also contains a certain amount of magnesium, the welding process is easy to promote the fusion zone to produce white tissue and the formation of hardened tissue in the heat-affected zone. To this end, we have taken measures to improve the thermal cycle of gas welding; the use of strong graphitized welding materials to weld the ball iron waste. In strong graphite