Laser marking for traceability on metal surfaces has become a significant new requirement for producers. The technology was introduced to the aluminum sector a few years ago. Other non-ferrous metal producers are now demanding it. As with aluminum, through careful control of surface roughness, high contrast identifiers can be etched onto the surface of other non-ferrous metals. High rms absorbing regions, or low rms reflective regions can be created, resulting in dark or bright marks respectively. Zinc, lead, magnesium, titanium, nickel, brass, tin and copper were all successfully marked. We created high contrast marks for barcodes, 2D codes and serial numbers. These marks can be used to ensure permanent traceability of metal products. In the case of each metal, marking speed and contrast levels were studied, and optimal marking parameters determined. An interesting comparison resulted.
Abstract submitted by Alex Fraser, Ph.D. CTO at Laserax