In this paper

the welding technology

mechanics and chemistry of the new steel type SQ460 FRW with 28 mm thickness were studied on the basis of welding test

and the welding slope was improved. The differences between pure CO

2

and hybrid gas under the protection of butt flat welding were compared. The process evaluation of flat welding

vertical welding

horizontal welding

vertical welding and cross welding of gas welding joints was carried out. Welding methods

such as simultaneous welding of double-sided double-arc single melting pool

high-speed pulse compression arc technology

and double-sided K-shaped slope 35° +4 mm gap

have been applied in the cross joints. Weld non-destructive testing

mechanical performance testing

macroscopic metallography

different temperature impact test

microscopic metallographic tissue observation and other test content are all qualified

can be used to guide the practical use of subsequent new steel species.