Method to evaluate Nd:YAG laser microscopic spot welding process using reflected laser power

Seo-jeong Park; Ryuichi Honma; Isamu Miyamoto

doi:10.1117/12.405760

6 November 2000 Method to evaluate Nd:YAG laser microscopic spot welding process using reflected laser power

Seo-jeong Park, Ryuichi Honma, Isamu Miyamoto

Proceedings Volume 4088, First International Symposium on Laser Precision Microfabrication; (2000) https://doi.org/10.1117/12.405760
Event: First International Symposium on Laser Precision Microfabrication (LPM2000), 2000, Omiya, Saitama, Japan

Abstract

A system consisting of 11 photodiode sensors from 0 to 90 degrees with respect to the workpiece surface has been developed to detect the angular distribution of the reflected laser intensity. Spot welding process in thin copper sheet using pulsed Nd:YAG laser was experimentally analyzed by detecting angular distribution of reflected laser beam with time resolution. Spot welding was performed with pulse duration of 1 ms on a phosphorus copper thin sheet with thickness 250 (mu) m in atmospheric condition. The change in the contour of the molten pool was investigated by time-resolved angular distribution of the reflected laser beam and penetrating time at a sampling frequency of 40 kHz. The laser beam passing through the thin sheet was also detected; the penetration time through the thin sheet was approximately 0.6 ms at an incident power density of 2.7x10⁶W/cm². The reflectance determined by integrating angular distribution of the reflected laser intensity was approximately 85% at the beginning of the pulse and then decreased with time. It is also shown that this system can be used for monitoring the quality of the lap welding of thin sheet metals.

Citation Download Citation

Seo-jeong Park, Ryuichi Honma, and Isamu Miyamoto "Method to evaluate Nd:YAG laser microscopic spot welding process using reflected laser power", Proc. SPIE 4088, First International Symposium on Laser Precision Microfabrication, (6 November 2000); https://doi.org/10.1117/12.405760

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