Effect of rare-earth on microstrcture and performance of Fe powder covered electrode welded joint

A new type of high efficiency Fe powder covered electrode contented rare-earth was researched. By analysis of fracture surface and metallic impurity in weld metal and impact charpy test in low temperature, it was confirmed that proper rare-earth can fined the crystalline grain and purified the weld metal. The covered electrode can be used to weld the important structure and has good technological properties.