Tech Briefs Magazine - March 2023 - BET-10

Thermal Management
Changing the beam shape to concentrate
energy input on the sides of the melt
pool maintains channel width in the trailing
edge, ensuring channel stays open
and reducing the flow velocity of the melt
behind the keyhole, which decreases the
risk of humping. Combining this with the
introduction of a different period into the
process interrupts the periodicity of the
humping, avoiding the defect altogether.
Switching the beam shapes in sequence
every few microseconds eliminates humping
and enables welding at higher speeds
without defects (Figure 8).
For large-scale part production, SLTL
(Sahajanand Laser Technology Limited), a
leading manufacturer of laser welding machines
in India has incorporated DBL technology
in a 3D cutting and welding machine
based on CBC. The project, funded by
the Israeli Innovation Authority and the
Global Innovation & Technology Alliance,
has resulted in defect-free production of
full-scale cooling plates.
References
1. Behzad Fotovvati, Steven F. Wayne, Gladius Lewis,
and Ebrahim Asadi, " A Review on Melt-Pool
Characteristics in Laser Welding of Metals, "
Advances in Materials Science and Engineering
(2018), https://doi.org/10.1155/2018/4920718.
2. Eric Punzel, Florian Hugger, Robert Dörringer,
Thorm Lembit Dinkelbah, and Andreas Bürger,
" Comparison of Different System Technologies for
Continuous-Wave Laser Beam Welding of Copper, "
Procedia CIRP 94 (2020):587-91, https://doi.
org/10.1016/j.procir.2020.09.081.
Figure 7: Simulation software from the Institute for Production Engineering and Photonic
Technologies at the Vienna University of Technology helped in the development of laser welding
processes for several cooling plate configurations. (Image: Civan Lasers)
3. Goppold C., et al., (2017, May). Dynamic Beam
Shaping Improves Laser Cutting of Thick Steel
Plates. Photonics Media. Retrieved January 13,
2023, from https://www.photonics.com/Articles/
Dynamic_Beam_Shaping_Improves_Laser_Cutting_
of/a62070.
4. Leavitt DD. Dynamic beam shaping. Med Dosim.
1990 Jun;15(2):47-50. doi:10.1016/09583947(90)90033-e.
PMID: 2118358.
5. Shekel. " Laser beam shaping increases welding speed
of thin foils, " www.laserfocusworld.com. Retrieved
January 14, 2023, from https://www.laserfocusworld.
com/laser-processing/article/14234022/laser-beamshaping-increases-welding-speed-of-thin-foils.
This
article was written by Ami Shapira,
Marketing Manager, Civan Lasers. For more
information visit, www.civanlasers.com. 
Solution
Result
Figure 8: To overcome the interface cracks, a new beam shape was designed and to eliminate humping a sequence of beam shapes was used
to break the periodicity of the hump-effect mechanism. (Image: Civan Lasers)
10
Battery & Electrification Technology, March 2023

https://www.photonics.com/Articles/Dynamic_Beam_Shaping_Improves_Laser_Cutting_of/a62070 http://www.laserfocusworld.com https://www.laserfocusworld.com/laser-processing/article/14234022/laser-beamshaping-increases-welding-speed-of-thin-foils http://www.civanlasers.com https://doi.org/10.1155/2018/4920718 https://doi.org/10.1016/j.procir.2020.09.081

Tech Briefs Magazine - March 2023

Table of Contents for the Digital Edition of Tech Briefs Magazine - March 2023