Katayama, Seiji

Kawahito, Yousuke

A new procedure of in-process monitoring and adaptive control has been developed for laser micro-spot lap welding of A3003 aluminum alloy sheets. The objective is to produce sound partial- and full-penetration welds without through-holes. In partial-penetration welds, the reflected laser beam and the radiated heat from the welding area were effective as in-process monitoring signals for detecting melting and though-hole formation in the upper sheet during laser irradiation. Laser pulse duration and peak power were controlled at every 150 µs intervals during spot welding on the basis of the heat radiation signal detecting the though-hole. In the full-penetration welds, the laser power was controlled so as to keep the value of the reflected light signal higher than the minimum and to restrict the variation of the heat radiation signal within one-third levels of the maximum increase and decrease, to prevent the formation of a through-hole. Consequently, the laser pulse peak power was properly controlled on the basis of the reflected light power and the heat radiation variation and this led to the production of sound welds at all times. The above results proved the effectiveness of in-process monitoring and the availability of adaptive control

Osaka University Knowledge Archive

Adaptive Control and Repair for Lap Welds of Aluminum Alloy Sheets Based upon In-Process Monitoring

https://ir.library.osaka-u.ac.jp/repo/ouka/all/3660/jwri34_02_007.pdf

Adaptive Control and Repair for Lap Welds of Aluminum Alloy Sheets Based upon In-Process Monitoring

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