純銅のレーザーマイクロスポット溶接におけるインプロセスモニタリング適応制御

概要

論文の詳細を見る
A new procedure of in-process monitoring and adaptive control is developed for micro-spot welding of 0.1-mm-thick copper sheets with combined beams of an AO Q-switched second harmonic YAG laser and a pulsed fundamental YAG laser. The objective of this method is to consistently produce fully penetrated welds stably. The pulse width of the fundamental YAG laser is controlled at 0.15-ms intervals during laser irradiation according to the neural network judgment of reflected beam and heat radiation from each processing area. This is accomplished by using a database of these values corresponding to the diameters of spot-weld fusion zones on the back surface. Through investigation of 200 samples, incomplete melting was detected in 7 samples under the laser irradiation conditions used conventionally. On the other hand, fully penetrated spot welds were stably produced in 200 samples subjected to the proposed in-process monitoring and adaptive control.
The Laser Society of Japanの論文