Product Code: ICA11_1306

The Effect of Adhesive Properties on Laser Spot Weld Bonding
Authors:
Wang Tao, Harbin Institute of Technology; Harbin Peoples Republic of China
Yanbin Chen, Harbin Institute of Technology; Harbin Peoples Republic of China
Yinan Ma, Harbin Institute of Technology; Harbin Peoples Republic of China
Mingmao Wang, Haerbin Institute of Technology; Harbin Peoples Republic of China
Liqun Li, Harbin Institute of Technology; Harbin Peoples Republic of China
Presented at ICALEO 2011

Laser weld spot bonding (LSWB) is a new joining process that combines laser welding with a layer of structural adhesive in a single joint, which has been put forward as low heat input, high robot performed, and insuring first time quality. The aim of this research is at the effect of adhesive properties on LSWB process, microstructure and mechanical properties. We found the viscosity of adhesive is the key factor during the welding process, due to good viscosity can reduce the impact of adhesive gas on the melting metal by providing a way to exhaust the adhesive gas. Carbon from the adhesive decomposing diffused into the welding joint, changing the microstructure of LSWB fusion zone from ferrite to pearlite, martensite and bainite. In tensile shear test, the result showed the fracture load of LSWB joint mainly depended on the mechanical properties of adhesive. The presence of adhesive will reduce the force distribution at welding joint and increase the bending angle. We found different fracture modes with different adhesives. The fracture mode of weld joint with better performance of adhesive is button-pullout mode, and the fracture mode will be interfacial fracture when the joint with worse performance adhesive.