Effect of laser shock peening on aluminium alloy laser-welds

Abstract

Effects of laser shock peening (LSP) on laser-welded aluminium alloy joints filling Al + 1.0 wt-% CeO₂ were investigated. Porosity ratio, microstructure, residual stress, hardness, tensile strength and fracture morphology were evaluated. Double-side LSP decreased the porosity ratio, refined microstructure, relieved the residual compressive stresses and increased the micro-hardness and tensile strength of the welds. Interaction between porosity and residual stress was also illustrated.

Keywords:

• Laser welding
• Laser peening
• Aluminium alloys
• Stress relaxation
• Fracture

Acknowledgements

Financial support from the National Science Foundation of China (No. 51201070), China Postdoctoral Science Foundation (No. 2015M570395), Industry-University-Institute Cooperation Joint Research Project of Jiangsu Province of China (No. BY2015070-05) and Postdoctoral Science Foundation of Jiangsu Province (No. 1501028A) is acknowledged.