Influence of intensity distributions on the process dynamics during laser deep penetration welding of pure nickel with a flexible ring mode laser source

被引：0
|
作者：
Möbus, Marcel [1 ]
Pordzik, Ronald [1 ]
Seefeld, Thomas [1 ,2 ]
机构：
[1] BIAS—Bremer Institut für angewandte Strahltechnik GmbH, Klagenfurter Straße 5, Bremen,28359, Germany
[2] MAPEX Center for Materials and Processes, Universität Bremen, Bibliothekstraße 1, Bremen,28359, Germany
来源：
Journal of Laser Applications | 2024年 / 36卷 / 04期
关键词：
Current research results demonstrate the potential of spatter reduction in laser deep penetration welding by using adapted laser beam intensity distributions between a ring and a core intensity. The spatter-reducing effect; resulting from the additional ring intensity; is often attributed to an enlarged keyhole opening. However; it remains a matter of debate how exactly an additional ring intensity influences the process. This study; therefore; investigates the effect of an increasing ring intensity on process dynamics and the spatter formation regime. Laser beam welding experiments were carried out on 2.4068 nickel hidden T-joints at different welding speeds of up to 16 m/min; as well as different intensity distributions; while maintaining a constant weld depth. The tests were evaluated by using two high-speed cameras from different angles to analyze spatter and their formation mechanisms as well as the keyhole opening. Metallographic analyses and x-ray images were used to determine influences on the seam shape and porosity. It was shown that a change in intensity distribution has a significant influence on the melt flow; the resulting amount of spatter; and the porosity; which is comparable across the investigated welding speeds. While a core-based power distribution leads to spatter formation on the rear of the keyhole opening; it was shown that a ring-based power distribution leads to spatter formation on both sides of the keyhole. With an optimal power distribution; spatter formation could be largely prevented. Based on these findings; the single wave regime; a stabilized regime; and a lateral spatter regime were identified. © 2024 Author(s);
D O I：
10.2351/7.0001529
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