Effect of Indentation Depth on Tensile Shear Strength in Ultrasonic Welding of A1050 Aluminum Alloys and C1100 Oxygen-free Copper Alloys

Ultrasonic welding technology is a joining method that utilizes localized frictional heat. Since the heat does not spread outside the joint, it is a method that can efficiently join two materials while minimizing thermal damage to the surrounding materials, making it an advantageous joining process for dissimilar materials. In this study, the effect of indentation on the ultrasonic welding characteristics of A1050 aluminum alloys and C1100 oxygen-free copper alloys was investigated. The changes in welding energy, tensile shear strength, and indentation depth were observed as the welding time increased while the applied clamping pressure and amplitude were fixed. The experimental results showed that the indentation and tensile shear strength of the ultrasonic weld were proportional within a certain range, but if the indentation depth becomes excessive, local damage to the material occurs, which actually reduces the joining strength.