High Power Laser Deep-penetration Welding and Its Troubles During the Production of Stainless Welded Pipe—A Kind of Welding Method for ф630mm Stainless Steel Continuous Welded Pipe Unit

This article analyzed penetration of CO2 laser welding,and its three important mechanisms to realize its stability.These three mechanisms are as follows:how to stably transfer laser beam power to welding pool.After fused hole formed in weld part,how the welding pool metal around fused hole stably flow to form stable weld.How to control metal plasma plummes in fused hole caused by laser beam.It analyzed the effect of narrow weld and HAZ on extending laser welding,introduced the effect of gap between LBW and GMAW on droplet transfer stability,while adopting LBW+GMAW combined welding.Finally,it listed several examples of high power laser deep-penetration welding used in production,and pointed out the research trend of laser deep-penetration welding.