Product Code: ICAL05_2305

In-Process Monitoring and Adaptive Control for Lap Welds of Aluminum Alloy Sheets
Authors:
Yousuke Kawahito, JWRI, Osaka University; Ibaraki Osaka Japan
Seiji Katayama, JWRI, Osaka University; Ibaraki Osaka Japan
Presented at ICALEO 2005

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 stably 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 in detecting melting and though-hole formation in the upper sheet during laser irradiation. Laser pulse duration and peak power were controlled at every 0.15 ms interval 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 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 leading 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.

Product Thumbnail

$28.00

Members: $28.00

Note: When applicable, multiple quantity discounts are applied once the items are added to your cart.