Carbon steel cored solder wire for gas-shielded arc welding

Abstract

The present invention relates to a carbon steel flux-cored welding wire for gas shielded are welding. Its flux composition contains (by wt%) TiO2 4-6.5, Si 0.3-0.8, Mn 1.5-3.1, SiO2 0.1-0.8, ZrO2 0.1-0.5, Fe 2-7, Al+Mg 0.5-1.2, alkali metal oxide (fluoride) (reduced K,Na,Li) content 0.1-0.35, F (conversion value) 0.05-0.2 and oxide or fluoride of alkali earth metal 0.005-0.2.

Description

Technical field [0001] The invention relates to a welding material for metal welding, in particular to a carbon steel flux-cored welding wire used for carbon dioxide gas shielded welding. Background technique [0002] Carbon dioxide gas-shielded flux-cored welding is compatible with the advantages of welding rods and carbon dioxide gas-shielded solid wire welding. It has high production efficiency, good welding process performance, and adjustable weld composition and operability. Therefore, this welding method has been widely used in the processing and manufacturing of steel structures such as ships and bridges. Because of this, the functional requirements for flux-cored welding wire are getting higher and higher, requiring that the flux-cored welding wire can not only adapt to faster welding speed, but also have good arc stability and welding operation performance; (not only for flat welding All-position welding such as vertical welding, automatic and semi-automatic weldin...

AI Technical Summary

Problems solved by technology

However, the low-temperature impact toughness of the weld in this technical scheme is unstable, and the comprehensive performance of -20°C low-temperature impact toughness and all-position welding needs to be improved.