We combine a frequency converted nanosecond laser pulse (prepulse) with a millisecond IR laser pulse improving reliability in copper spot welding significantly: The coefficient of variance of the spot weld diameter is decreased to 2% and the weld probability is increased to 100% in a wide parameter range. Additionally, when using the prepulse, the required IR pulse power can be reduced by more than 30% while the energy contribution of the prepulse (mJ-range) is negligible compared to the energy of the welding pulse (J-range). The prepulsing is carried out with a prototype of a small and robust laser module.
Enhancing process stability in infrared laser micro welding of copper using frequency converted short prepulses
Anas Moalem, Philipp von Witzendorff, Maik Frede, Rainer Kling; March 23–25, 2010. "Enhancing process stability in infrared laser micro welding of copper using frequency converted short prepulses." Proceedings of the Pacific International Conference on Applications of Lasers and Optics. PICALO 2010: 4th Pacific International Conference on Laser Materials Processing, Micro, Nano and Ultrafast Fabrication. Wuhan, People’s Republic of China. (pp. pp. 839-843). ASME. https://doi.org/10.2351/1.5062124
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