SINUSOIDAL SURFACE TEXTURING USING A NANOSECOND PULSED MOPA FIBER LASER

摘要

Sinusoidal surface texturing and roughnessrnmodification generated on aluminum 6111 andrnstainless steel alloy substrates using a diode-pumpedrnpulsed fiber laser are investigated as a pre-processingrnstep for improved adhesive bonding. Differentrnprocessing parameters are modified in order to assessrntheir effect on the resulting surface topology using anrnaverage power of up to 10 W, pulse width 50 to 200rnns, beam diameter spot size 19 μm, and pulse energyrnup to 0.5 mJ. The sinusoidal profiles of differentrngeometry are obtained. The controlled texturedrnsurfaces of thin sheets will be used to study the effectrnof the topology of the contact surfaces in an adhesivernjoint. Previous experimental results have shown thatrnlonger pulse widths at lower peak powers increase therndepth of penetration creating a favorable topology forrnthe constrained area.