Work

Parametric study of the laser energy absorption in high-power laser beam welding

Year: 2024

Type: article

Abstract: Laser energy absorption on the keyhole wall is decisive for the thermodynamic behavior and the resultant weld properties in the high-power laser beam welding process. However, its highly transient nature on a microsecond scale makes the quantitative analysis challenging. In this paper, the influence of the relevant welding parameters on laser energy absorption is studied statistically by utilizing multiphysical modeling, in which the three-dimensional transient keyhole dynamics and thermo-fluid flow are calculated. A dynamic mesh adaption technique and a localized level-set-based ray-tracing method are employed to improve the model accuracy further. The results show that the focus position has a remarkable effect on the time-averaged laser absorption, and in contrast, the laser energy distribution regime is only slightly influenced by the welding speed in the studied parameter range (1.5–3.0 m/min). The absorption ratio of the laser energy on the keyhole front wall decreases with increasing welding speed and increases with upward-moving focus positions. The comparison between the calculated results and the experimental measurements ensures the validity of the proposed model.

Source: Journal of Laser Applications

DOI: 10.2351/7.0001537

Authors: Xiangmeng Meng, Stephen Nugraha Putra, Marcel Bachmann, Michael Rethmeier

Institutions: Federal Institute For Materials Research and Testing, Fraunhofer Institute for Production Systems and Design Technology, Technische Universität Berlin

Language: English

Topic: Welding Techniques and Residual Stresses

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Funder: Deutsche Forschungsgemeinschaft

Awards: Entwicklung eines physikbasierten Machine Learning Frameworks zur Vorhersage der Bildung prozessbedingter Porosität und der Optimierung der Schweißparameter beim Hochleistungslaserstrahlschweißen, Multiphysikalische Simulation des Einflusses eines zusätzlichen Magnetfeldes auf die Bildung von Prozessporen beim Hochleistungslaserstrahlschweißen