球铁是一种高强度铸铁材料,含碳量高,又含有一定量的镁。在焊接过程中容易使熔合区产生碳化物及在热影响区形成脆硬组织。所以,焊接球铁零件是比较困难的。采用轻稀土镁球铁焊条冷气焊,可修复球铁缺陷,但存在着:1.焊接工艺复杂,焊缝易出现气孔、夹渣;2.焊补时间较长,易出现球化衰退现象。 Ductile iron is a high strength cast iron material with a high carbon content and a certain amount of magnesium. During the welding process, it is easy to produce carbides in the fusion zone and to form brittle and hard tissues in the heat-affected zone. Therefore, the welding of ductile iron parts is more difficult. The use of light rare earth magnesium ball electrode air-condition welding, repair ductile iron defects, but there are: 1. The welding process is complex, the weld prone to porosity, slag; 2. Welding longer, prone to ball-point recession phenomenon.