The effect of wobbling on the welding characteristics in Al/Cu fiber laser welded joints

The IR laser welding of aluminum and copper materials for lithium-ion batteries has limitations due to inadequate joint strength caused by their high thermal conductivity and reflectivity. To overcome these problems, this study has applied beam oscillation to increase the joint area of welded joints. A 1000 series aluminum alloy and oxygen-free copper sheets with a thickness of 0.5 mm were welded through 2.5 kW fiber laser welding. The effect of the welding parameters of amplitudes (0, 0.2, 0.4, 0.6 mm) on weldability and electrical characteristics of welded joints has been investigated. The results confirmed that as the amplitude increases, the bead width at the interface increases, and penetration depth decreases. In addition, the tensile-shear load increased with higher amplitudes, and the maximum tensile-shear load was 1.1 kN at a travel speed of 400 mm/s with an amplitude of 0.6 mm. The minimum electrical resistance obtained was 82 & mu;& omega; at an amplitude of 0.6 mm, which was approximately 25% lower compared to the amplitude of 0 mm due to the reduction of intermetallic compounds.

Automated summary

By adjusting the amplitude, the joint area and strength of aluminum and copper materials in lithium-ion batteries can be increased through IR laser welding.