Nondestructive Testing Of Metal Members Based On Electromagnetic Excitation Infrared Thermal Imaging

The pursuit of quality is aim in the century today, the quality of the products will be the future development of the theme. It is said that advanced NDT technology will be in the fierce competition in a leading position, and on the other side also reflects a country’s industrial development level. In this paper, presented a new kind of detection method based on the infrared thermal imaging of metal components of the electromagnetic excitation table nondestructive testing methods in this background. This technology is mainly use the heating technology of infrared thermal imaging and eddy current testing specimen surface defects, compared with the previous detection method, the new detection methods in efficiency, accuracy and operation has a great advantage.This paper research electromagnetic induction base on infrared thermal imaging nondestructive testing methods, using the finite element calculation and experiment analysis of two kinds of means, to detect the defects of the metal specimen. The physical process of electromagnetic-thermal applied multiple physical field finite element analysis software COMSOL to analyze. the technique of contrast was used to built mathematics calculation model, boundary conditions and initial value of the surface crack and non-defect metal specimen and gives the different depth of defect form about the induced current density field under different and the electromagnetic thermal coupling temperature field distribution form, At the same time, using the parameter that was be discussed to simulate excitation test results, determine the magnetic gap, excitation frequency and time of defects may affect incentives.set up by the excitation source, computer, the infrared thermal image, excitation coil of electromagnetic induction incentive infrared thermal imaging nondestructive testing system, testing six groups of different defects, and using the digital image processing technology to deal with the collected infrared thermal image. The experimental results show that induction incentive infrared thermal image inspection can be successfully applied in the metal material and the detection of surface crack, solved the nondestructive testing technology in the surface crack problems.