scholarly journals On the search for the origin of the bulge effect in high power laser beam welding

2019 ◽  
Vol 31 (2) ◽  
pp. 022413 ◽  
Author(s):  
Antoni Artinov ◽  
Nasim Bakir ◽  
Marcel Bachmann ◽  
Andrey Gumenyuk ◽  
Suck-Joo Na ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Laser Beam Welding ◽  
High Power Laser ◽  
Power Laser

scholarly journals High Power Laser Beam Welding of Thick-walled Ferromagnetic Steels with Electromagnetic Weld Pool Support

2016 ◽  
Vol 83 ◽  
pp. 362-372 ◽  
Author(s):  
André Fritzsche ◽  
Vjaceslav Avilov ◽  
Andrey Gumenyuk ◽  
Kai Hilgenberg ◽  
Michael Rethmeier
Keyword(s):  
Laser Beam ◽  
Weld Pool ◽  
High Power ◽  
Laser Beam Welding ◽  
High Power Laser ◽  
Power Laser ◽  
Ferromagnetic Steels

scholarly journals The bulging effect and its relevance in high power laser beam welding

2021 ◽  
Vol 1135 (1) ◽  
pp. 012003
Author(s):  
Antoni Artinov ◽  
Xiangmeng Meng ◽  
Nasim Bakir ◽  
Ömer Üstündağ ◽  
Marcel Bachmann ◽  
...  
Keyword(s):  
Laser Beam ◽  
Penetration Depth ◽  
Weld Pool ◽  
High Power ◽  
High Speed ◽  
Laser Beam Welding ◽  
Hot Cracking ◽  
Alloying Elements ◽  
High Power Laser ◽  
Power Laser

Abstract The present work deals with the recently confirmed widening of the weld pool interface, known as a bulging effect, and its relevance in high power laser beam welding. A combined experimental and numerical approach is utilized to study the influence of the bulge on the hot cracking formation and the transport of alloying elements in the molten pool. A technique using a quartz glass, a direct-diode laser illumination, a high-speed camera, and an infrared camera is applied to visualize the weld pool geometry in the longitudinal section. The study examines the relevance of the bulging effect on both, partial and complete penetration, as well as for different sheet thicknesses ranging from 8 mm to 25 mm. The numerical analysis shows that the formation of a bulge region is highly dependent on the penetration depth and occurs more frequently during partial penetration above 6 mm and complete penetration above 8 mm penetration depth, respectively. The location of the bulge correlates strongly with the cracking location. The obtained experimental and numerical results reveal that the bulging effect increases the hot cracking susceptibility and limits the transfer of alloying elements from the top of the weld pool to the weld root.

scholarly journals Weld pool shape observation in high power laser beam welding

Procedia CIRP ◽  
2018 ◽  
Vol 74 ◽  
pp. 683-686 ◽  
Author(s):  
Antoni Artinov ◽  
Nasim Bakir ◽  
Marcel Bachmann ◽  
Andrey Gumenyuk ◽  
Michael Rethmeier
Keyword(s):  
Laser Beam ◽  
Weld Pool ◽  
High Power ◽  
Laser Beam Welding ◽  
High Power Laser ◽  
Power Laser ◽  
Pool Shape ◽  
Weld Pool Shape

Avoidance of end crater imperfections at high-power laser beam welding of closed circumferential welds

2019 ◽  
Vol 64 (2) ◽  
pp. 407-417 ◽  
Author(s):  
Sergej Gook ◽  
Ömer Üstündağ ◽  
Andrey Gumenyuk ◽  
Michael Rethmeier
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Laser Beam Welding ◽  
High Power Laser ◽  
Power Laser ◽  
Circumferential Welds

scholarly journals Numerical Analysis of the Partial Penetration High Power Laser Beam Welding of Thick Sheets at High Process Speeds

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1319
Author(s):  
Antoni Artinov ◽  
Xiangmeng Meng ◽  
Marcel Bachmann ◽  
Michael Rethmeier
Keyword(s):  
Numerical Analysis ◽  
Laser Beam ◽  
Ray Tracing ◽  
Penetration Depth ◽  
High Power ◽  
Laser Beam Welding ◽  
High Power Laser ◽  
Power Laser ◽  
Trapping Effect ◽  
Process Speed

The present work is devoted to the numerical analysis of the high-power laser beam welding of thick sheets at different welding speeds. A three-dimensional transient multi-physics numerical model is developed, allowing for the prediction of the keyhole geometry and the final penetration depth. Two ray tracing algorithms are implemented and compared, namely a standard ray tracing approach and an approach using a virtual mesh refinement for a more accurate calculation of the reflection point. Both algorithms are found to provide sufficient accuracy for the prediction of the keyhole depth during laser beam welding with process speeds of up to 1.5mmin−1. However, with the standard algorithm, the penetration depth is underestimated by the model for a process speed of 2.5mmin−1 due to a trapping effect of the laser energy in the top region. In contrast, the virtually refined ray tracing approach results in high accuracy results for process speeds of both 1.5mmin−1 and 2.5mmin−1. A detailed study on the trapping effect is provided, accompanied by a benchmark including a predefined keyhole geometry with typical characteristics for the high-power laser beam welding of thick plates at high process speed, such as deep keyhole, inclined front keyhole wall, and a hump.

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