In-process monitoring of industrial applications using laser ultrasound


Industrial processes usually rely on post-process non-destructive testing inspections. Ideally, these inspections would be better placed during the processes. Additive manufacturing (AM) is ideal to apply such an approach due to its unique layer-by-layer or bead-by-bead build method. An optimal place to verify the part quality is after a layer or bead, with the potential advantage of reducing or eliminating the need to inspect after the full build or after machining. Additionally, other industrial processes, such as laser welding, could also benefit from such an approach. Laser ultrasonic testing is a non-contact inspection technique with potential for in-process monitoring of such processes which are at elevated temperatures. This paper explores the capability of this technique for AM and welding industrial applications.