Laser pressure welding of dissimilar aluminium and copper: microstructure and mechanical property

In this work, laser pressure welding of dissimilar aluminium and copper was conducted at a high welding speed of 15 m min(-1). One-micron intermetallic compounds (IMCs) layer with heterogeneous dual-phases (copper and gamma-Al4Cu9 phases) laminates in the joint interface were observed by transmission electron microscopy. The results showed that the combination of two joining mechanisms led to improved mechanical property, namely the mechanical interlocking due to the curved interface and the metallurgical bonding by the presence of the thin IMCs layer with heterogeneous laminates. The tensile shear force and the shear strength of the joint reached 2055 N and 111.94 MPa, respectively. The present study provides a more efficient method to join dissimilar aluminium and copper.

Automated summary

In this study, laser pressure welding was used to create one-micron intermetallic compounds (IMCs) layer with heterogeneous dual-phases laminates at the joint interface between dissimilar aluminium and copper. The combination of mechanical interlocking and metallurgical bonding led to improved mechanical properties of the joint, with a tensile shear force of 2055 N and shear strength of 111.94 MPa achieved. This work provides a more efficient method for joining dissimilar aluminium and copper.