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Beam oscillations for modification of fatique properties of laser welds
 Šebestová, Hana ; Jambor, Michal ; Mrňa, Libor
The application of suitable beam oscillating parameters reduces root notches of laser welds. Beam oscillation welds reach better fatigue properties compared to conventional laser weld, even though the notches are not reduced. The welds made with linear oscillation have the highest number of cycles to fracture in the high-cycle region. However, the root notches are not eliminated in these welds because of high values of current heat input on weld peripheries. The experienced thermal cycles must be also considered. They can induce microstructural transformations and change the distribution and magnitude of residual stresses, which are the additional factors influencing the fatigue lifetime of a weld joint.
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