Abstract
The purpose of this work is to understand keyhole formation observedduring pulse Nd:YAG laser welding. An analysis of the evolution of the keyholegeometry during a laser pulse was carried out by radiography x-ray flash, fortantalum and a titanium alloy target. From the images obtained by x-rayradiography, we determined the evolution of the geometry of the keyhole (depthand width) during the laser pulse. The keyhole appears after a delay, andincreases linearly. We compare the measured creation delay with a valueobtained by an analytical thermal model. We present a calculation of theenergy deposit law by Fresnel absorption; the aim is to calculate the raytrajectory in the keyhole to deduce the local absorption. The absorptionincreases strongly during the formation of the keyhole, and tends towards alimit value. Further, we compare the mean absorption during a pulsewith a measurement using a differential microcalorimeter.
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