Abstract
Coatings deposited by laser cladding are characterized by high hardness and extended wear, chemical or thermal resistance. However, inappropriate process parameters or material incompatibility can result in generation of stress that cause coating crack. Since it is a critical fault, such coatings are tested with NDT methods such as PT or MT. This paper presents the outcome of crack detection in metallic coatings with laser spot thermography. The research was conducted with various imaging systems and two laser sources with different wavelengths. The influence of imaging and excitation systems parameters on the inspection sensitivity and robustness to disturbances that arise from inhomogeneous surface were presented.
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