Mechanism of Improving Toughness of Self-shielded Flux-cored Wire

Self shielded flux cored wire is a welding consumable,which has been developed rapidly in the world,but slowly in China.The key studies on SSFCE are focused on operative performance of the wire and the toughness of the deposited metal.In the paper,the composition,microstructure and properties of the deposited metal are investigated deeply through the addition of trace elements in the alloy system with higher Al content and controlling characteristic parameters of inclusion to obtain the microstructure with more acicular ferrite.The impact toughness of the deposited metal can reach 97 J at 0℃.The results are useful for improving the toughness of the deposited metal with higher Al content.