高功率激光深熔焊及其在不锈钢焊管生产中应用的障碍(二)——ф630mm不锈钢连续焊管机组焊接方法研究

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

分析了CO2激光焊的熔深及稳定性实现的三个重要机理性问题:激光束能量怎样稳定地传输给焊接熔池;激光束在焊件上形成熔孔后其周围熔池金属怎样稳定地流动而形成稳定的焊缝;激光束激发的熔孔(小孔)内金属等离子羽团的影响怎样控制。分析了焊缝及热影响区狭窄对激光焊推广应用的影响,介绍了LBW+GMAW组合焊接时两者的间距对熔滴过渡稳定性的影响。列举了高功率激光深熔焊在生产应用中的几个实例并指出了激光深熔焊研究的新动向。

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.