Effect of Aluminum Surface State on Laser Joining between 1050 Aluminum Sheet and Polypropylene Resin Sheet Using Insert Materials

Abstract

Laser joining for different materials between 1050 aluminum alloy sheet of 1 mm thickness and polypropylene sheet of 2 mm thickness using a newly developed insert sheet was studied. The diode laser-irradiation to the polypropylene side was carried out in air. The effects of the aluminum surface state on the joining properties were examined. The joining strength increased with the increase in aluminum surface area except for the surface with the intense ruggedness. It was found that the chemical condition of aluminum surface treated with the acid or alkaline solution strongly affected the joining strength rather than the surface roughness.