Microstructure characterization and mechanical properties of laser-welded copper and aluminum lap joint

Abstract

Laser roll welding of dissimilar metal joint of zinc coated steel to aluminum alloy J. Laser Appl. 22, 1 (2010); 10.2351/1.3367741 Determination of true stress-strain curve for the weldment of aluminum laser-welded blanks J. Laser Appl. 17, 159 (2005); 10.2351/1.1961652 Surface and microstructural characterization of laser beam welds in an aluminum alloyThe microstructure in the intermediate layer of a laser-welded Cu-Al lap joint was examined metallographically. Tensile shear test was performed, and fracture surface analysis was also performed using scanning electron microscopy with energy dispersive spectroscopy. Results showed that there were several different zones with diverse characteristics of morphology and composition in the intermediate layer of the weld joint. Banded and cellular structures were observed in the hypereutectic zone; a lamellar structure was found in the eutectic zone which was the narrowest zone with the finest microstructure; a dendritic structure was obtained in the hypoeutectic zone with the coarsest microstructure and widest zone. The joint faulted in the dendritic hypoeutectic zone, under a combination of brittle and shear mode in the fracture surface. The maximum shear load of the Cu-Al joint decreased with increasing primary dendrite arm spacing and the growth of secondary dendrite in the hypoeutectic zone, which was induced by increasing laser power. V C 2014 Laser Institute of America. [http://dx.

Application of Laser Welding in Electric Vehicle Battery Manufacturing: A Review

“…Xue et al [52] observed the microstructure of the intermediate layer in laser welded copper aluminum lap joints. Tensile shear tests were conducted, and the fracture Xue et al [52] observed the microstructure of the intermediate layer in laser welded copper aluminum lap joints. Tensile shear tests were conducted, and the fracture morphology was analyzed using SEM and EDS.…”

Metallographic Studies of Dissimilar Al-Cu Laser-Welded Joints Using Various Etchants

“…In fact, while joining Al and Cu, the chemical composition of the joint passes through the entire phase diagram, and depending on the intermixture and cooling rate, this pass is a few microns or less thick. The properties of the varying IMC are not similar, some of them were found to be harder and with higher resistivity [5], and others are more crack sensitive [6].…”

“…Each layer consists of varying IMC and base material, and the author stated that joint properties can be linked to their relative layer. In [6], five layers were identified using an SEM, too. The authors prepared optical micrographs, etched with Keller's reagent.…”