Abstract A method to improve penetration and stabilize the welding phenomenon at a high welding speed has been described through experimental and numerical investigations. Using a high power laser beam consisting of a center and a ring part, influences of shielding gas direction and flow rate, laser power density, and welding mode defined by variable intensity distribution have been clarified. The weld bead was evaluated in terms of width, height, shape and roughness. Dual-mode laser irradiation of center and ring power made it possible to stabilize the welding process. The center power helps to achieve sufficient deep penetration, while ring power ensures good temperature distribution. Good surface quality and deep penetration welding could be achieved with dual-mode welding, using low flow rate of shielding gas supplied from the backside direction.

中文翻译：

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使用可调环模光纤激光器对铝进行高表面质量焊接

摘要 通过实验和数值研究，描述了一种在高焊接速度下提高熔深和稳定焊接现象的方法。使用由中心部分和环形部分组成的高功率激光束，阐明了保护气体方向和流量、激光功率密度和由可变强度分布定义的焊接模式的影响。根据宽度、高度、形状和粗糙度对焊道进行评估。中心和环形功率的双模激光照射使焊接过程稳定成为可能。中心功率有助于实现足够的深度穿透，而环形功率确保良好的温度分布。双模焊接可实现良好的表面质量和深熔焊，