パルスYAGレーザの溶接に関する研究(第1報) : 反射光による加工現象の観察と溶接のモニタリング

概要

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Laser light reflection in pulsed YAG laser weld-ing and a monitoring method of laser welding are investigated, Pulsed YAG. laser welding involves several processes such as surface melting, beam-hole forming, beam-hole vanishing, and solidifica-tion. During a pulse, the reflectivity changes with each process. The reflectivity of a cold rolled plate is about 40% of the polished surface. The molten surface reflectivity is about 80% of the polished one, In the cold rolled plate, reflection of laser light increases with the surface melting. Laser light comes to be absorbed efficientiy when the beam-hole is formed. By observing the change of the reflected light intensity, it is possible to detect a timing when the beam-hole is formed. By using the time from laser irradiation to the beam-hole forming, power density of irradiated laser beam can be estimated. In the lap joint, when the beam-hole has penetrated an upper plate, transient in-crease of the reflected light is observed, A gap mal-function in the lap joint can be detected by the excessive increase,
公益社団法人精密工学会の論文
1984-12-05