Abstract: A process and a system for creating internal stress in a metallic workpiece by laser shock peening is provided. In the process, a first laser pulse is applied to a treatment site of the workpiece covered by a surface layer. A second laser pulse follows the first laser pulse in time, and is applied to the treatment site of the workpiece. A covering layer, such as flowing water, is provided over the treatment site during the application of the laser pulses.

Abstract: A forming tool for widening an opening includes an expanding device with several expansion elements. The expansion elements are each provided with a curved forming surface extending between two peripheral end edges. The expansion elements are moveable between a first position corresponding to a contracted state where the expansion elements in connection with one another by way of separating surfaces, and a second position corresponding to a widened state where the expansion elements are displaced in radial direction from a center of the expanding device such that the separating surfaces are spaced apart from one another. In the first position the peripheral end edges are spaced further apart from the center than a central region of the forming surfaces so that the fatigue strength of mounting bores can be increased, openings in thick-walled components can expanded more reliably, and/or the formation of cracks is avoided.

Abstract: A method and device for surface peening, particularly ultrasonic shot peening, of a component in the region of a passage opening is disclosed. A vibration device impinging the blasting material is disposed on one side and a counter-element is disposed on an opposite side relative to a component region having the passage opening. The counter-element is disposed at a distance relative to the corresponding side of the component region.

Abstract: A method and device for surface peening, particularly ultrasonic shot peening, of a component in the region of a passage opening is disclosed. A vibration device impinging the blasting material is disposed on one side and a counter-element is disposed on an opposite side relative to a component region having the passage opening. The counter-element is disposed at a distance relative to the corresponding side of the component region.

Abstract: A process and a system for creating internal stress in a metallic workpiece by laser shock peening is provided. In the process, a first laser pulse is applied to a treatment site of the workpiece covered by a surface layer. A second laser pulse follows the first laser pulse in time, and is applied to the treatment site of the workpiece. A covering layer, such as flowing water, is provided over the treatment site during the application of the laser pulses.