SINUSOIDAL SURFACE TEXTURING USING A NANOSECOND PULSED MOPA FIBER LASER

摘要

Sinusoidal surface texturing and roughness modification generated on aluminum 6111 and stainless steel alloy substrates using a diode-pumped pulsed fiber laser are investigated as a pre-processing step for improved adhesive bonding. Different processing parameters are modified in order to assess their effect on the resulting surface topology using an average power of up to 10 W, pulse width 50 to 200 ns, beam diameter spot size 19μm, and pulse energy up to 0.5 mJ. The sinusoidal profiles of different geometry are obtained. The controlled textured surfaces of thin sheets will be used to study the effect of the topology of the contact surfaces in an adhesive joint. Previous experimental results have shown that longer pulse widths at lower peak powers increase the depth of penetration creating a favorable topology for the constrained area.