@article{oai:repo.qst.go.jp:00079622,
 author = {Sano, Tomokazu and Eimura, Takayuki and Hirose, Akio and Kawahito, Yosuke and Katayama , Seiji and Arakawa, Kazuto and Masaki, Kiyotaka and Shiro, Ayumi and Shobu , Takahisa and Sano, Yuji and Ayumi, Shiro and Takahisa, Shobu},
 issue = {11},
 journal = {Metals},
 month = {Nov},
 note = {The purpose of the present study was to verify the effectiveness of dry laser peening (DryLP), which is the peening technique without a sacrificial overlay under atmospheric conditions using femtosecond laser pulses on the mechanical properties such as hardness, residual stress, and fatigue performance of laser-welded 2024 aluminum alloy containing welding defects such as undercuts and blowholes. After DryLP treatment of the laser-welded 2024 aluminum alloy, the softened weld metal recovered to the original hardness of base metal, while residual tensile stress in the weld metal and heat-affected zone changed to compressive stresses. As a result, DryLP treatment improved the fatigue performances of welded specimens with and without the weld reinforcement almost equally. The fatigue life almost doubled at a stress amplitude of 180 MPa and increased by a factor of more than 50 at 120 MPa. DryLP was found to be more effective for improving the fatigue performance of laser-welded aluminum specimens with welding defects at lower stress amplitudes, as stress concentration at the defects did not significantly influence the fatigue performance.},
 title = {Improving Fatigue Performance of Laser-Welded 2024-T3 Aluminum Alloy Using Dry Laser Peening},
 volume = {9},
 year = {2019}
}