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在机械制造业中,鑄铁应用得非常广泛,这是因为鑄铁具有良好的鑄造性能和切削性能,而且是一种非常便宜的金屬。鑄铁的广泛应用,給焊接工作者提出了一个重要課题——解决鑄铁的焊补問题。研究如何利用焊接方法来修复鑄铁件在鑄造时及使用过程中出現的各种缺陷,使废品复活,具有重大的經济意义。解决鑄铁焊补是一个很复杂的任务,这是由于鑄铁焊补时会發生下列困难:(1)鑄铁的脆性很大,焊接时由于不均勻的受热,会造成很大的内应力,容易出現裂縫;(2)焊接时冷却速度很快,在热影响区容易出
In the machinery manufacturing industry, cast iron is widely used because cast iron has good casting and cutting properties and is a very cheap metal. The extensive use of cast iron has given welding workers an important topic - to solve the problem of welding cast iron. It is of great economic significance to study how to use the welding method to repair various defects that occur during casting and during use of the cast iron, so as to revitalize the scrap. Solve cast iron welding is a very complex task, which is due to the cast iron welding repair will occur following difficulties: (1) a very brittle cast iron, welding due to uneven heating, will cause a lot of internal stress , Prone to cracks; (2) welding cooling rate is very fast, easily out of the heat-affected zone