Abstract
In order to improve corrosion resistance in Friction Stir Spot Welding (FSSW) dissimilar materials joint, inserting a resin film between metallic material sheets was proposed. In the present study, A1100 and Zn plated steel was welded by FSSW with inserting a PET film. In case of A1100 / Zn plated steel FSSW joint welded without PET film, tensile shear strength of 26.6 MPa was obtained. Moreover, according to immersion test inside salt water for 1100 / Zn plated steel FSSW joint welded without PET film, corrosion significantly occurred. FSSW was carried out for welding between A1100 and Zn plated steel inserted PET film with different thickness. Zn was detected above and below the PET film in the joint inserted a thick PET film. In case of a joint welded with thinner PET film, damage of the film induced during FSSW process was observed. In a joint welded with a PET film with the middle thickness, flowing of molten Zn to above and to below the PET film and damage in the film were not found. According to observation of delaminated joint, it was found that the PET film was bonded to A 1100 and to Zn plated steel by FSSW. Improving of corrosion resistance could be expected in A1100 / Zn plated steel FSSW joint by inserting a PET film with appropriate thickness.
