Finite Element simulation and Experimental verification of Infrared Thermal Wave Non-destructive Inspection for the Defects in Welded Joint

Finite element analysis software is used in this simulation ,we design some defects which have different type dimension, and depth in weld with the preprocessor of the soft, heat flux is imposed on one surface where was welded,surface temperature distribution of tested object is computed,cloud maps of surface temperature distribution are obtained by general postprocessor , more creditable message about defect is obtained qualitatively and quantitatively according to thermal character and surface temperature rise.The emphasis is placed on the relationship between the type, dimension and position of defect and the surface temperature rise. In experiment, using the infrared thermal wave nondestructive detection system for steel with weld involve with defects, the high resolution thermal images and temperature change curves about defect in weld were given. The results is that defects in the weld with type, dimension and position can be extracted. The last, the simulated results compare with the experiment results, the conclusion is that two results is validated on each other providing foundation for the establishment of exact and reliable testing standard.