Study And Development On The Integrated Ultrasound And Eddy Current Automatic Inspection System Of Seamless Steel Pipe

Non-destructive testing technology is playing an extremely important role in the seamless steel tube production quality control testing. With the development of the modern industrial technology, the requirements of nondestructive testing system is also improved, high efficiency, accuracy and reliability inspection system is the key issues for the NDT inspection system in recent years. Among them, Ultrasonic testing, Eddy current testing, Magnetic particle testing has successively used in the inspection of pipe. In this thesis, combined with the actual requirements and specific overall scheme in the ultrasound and eddy current integration automatic detection system of Seamless steel pipe, and had researched on this system, the related theory of ultrasonic, eddy current and the key technology of machinery, software design were described.In chapter 1. the engineering background and the important significance of the research work were discussed. The ultrasound and eddy current testing technology, the status of research on the inspection system and the future development trend were introduced. The main content and the arrangement of the chapter in this thesis were given in the next.In chapter 2, selective focuses on the relevant principles of ultrasonic eddy current testing. The classification of ultrasonic flaw detection, the wave transform and the choice of probe specifications were introduced. Simultaneously, the electromagnetic induction, skin effect and some related technical parameters of the eddy current testing technology were described-the eddy current probe model specification was determined by Basing on the eddy current probe types and system development to consider.In chapter 3, give a simple introduction for the routine methods of pipe flaw location, quantitative defect. Lead to an ultrasonic and eddy current location quantitative method of seamless steel tube detection system for this chapter. and given a defect image pattern recognition analysis method, used of crack, gas hole, and three kinds of defects to point out defects classification tree analysis method. Lay the foundation for system design work next part.In chapter 4. combined with above a few chapters of the theory and key technical guidance, the overall detection system scheme was introduced, simultaneously, the chapter made a detailed description for the system of machinery-probe holder, long men frame, transmission structure. software system-master control program, ultrasound, eddy current portion design. At the end, the test data processing of visualization and three-dimensional imaging were discussed.In chapter 5, the system which was developed had been tested. Refer to the national testing standard indicators for experiment item by item. Confirm the reliability and validity of the system, and could invest in the future of seamless steel tube detection production application, at the same time it gave a seamless steel pipe ultrasonic eddy current testing system reliability verification method.In chapter 6. the thesis work contents and innovation points were reviewed and summarized. and some tentative ideas and prospected for the possible research in future is presented.