Monitoring and Adaptive Control of Laser Spot Welding(Physics, Processes, Instruments & Measurements, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)

概要

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Recently the use of lead solder has been one of the important problems from the environmental viewpoint. Laser micro spot welding is thought to have a great potential as one process to replace the mounting of electronic components with lead solder. However, copper, one of the conductive materials for electronic products, has such a high thermal conductivity and such a high reflectivity that it is extremely difficult to produce stable high quality welds with a YAG laser beam of 1,064nm in wavelength. Nevertheless, the constant production of sound welds is always required In this research, therefore, we developed an adaptive control system in micro welding of 0.2mm thick copper sheet with a fundamental YAG laser combined with an AO Q-switched second harmonic YAG laser. Then, the number of the second harmonic YAG laser pulses was controlled at 1ms interval, according to a neural network judgment on the basis of the data of a reflected beam of the fundamental YAG laser and vibration of the specimen relating to the melting behavior.
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