Image processing algorithms for crack detection in welded structures via pulsed eddy current thermal imaging

As the common metal structure type, welded structures are widely used in civil infrastructure, bridges, ships and engineering machinery. Fatigue cracks often originate in welds enduring intense stress concentration or in welding defects under long-term continuous alternating loading [1]. Once these cracks propagate to a critical length, the structural integrity will be challenged. As a result, welding cracks detection is significant in engineering applications.