铸铁件的焊接存在许多困难。尤其是进行铸铁冷焊时,如果不因势利导,措施得法,往往容易失败。长期在生产实践中的不断探索,我总结出铸铁冷焊的“四字经”,即“短、厚、窄、小”的冷焊工艺,现介绍如下。 (1)短。铸铁冷焊时焊缝宜短不宜长,使焊缝热量不至过高,又减少热影响区与母材的温差,防止产生较大的热应力,同时应变也较小。 (2)厚。焊肉宜厚不宜薄,较厚的焊肉在 Cast iron parts of the welding there are many difficulties. Especially when carrying on the cold welding of cast iron, it is often easy to fail if it is not circumscribed to the situation and the measures are taken. Long-term continuous exploration in the production practice, I concluded that the cold-welding of cast iron “Four Character Classic”, that is, “short, thick, narrow, small” cold welding process, are presented below. (1) short. Weld cast iron welding should be short and should not be too long, so that the weld heat is not too high, but also reduce the heat-affected zone and the base metal temperature difference, to prevent greater thermal stress, while the strain is also small. (2) thick. Should not be thin welding meat thick, thick welds in