Design And Simulation For A New Type Of Photonic Crystal

Oil and gas pipeline has become one of the most economical and most convenient means of transportation all aver the World. In our country, it forms a huge pipeline networksystem.In order to ensure the safety of these pipelines in the day-to-day operations, not only to ensure the pipeline material quality, the security status of weld are also impoNDT could test pipe welds of the constructing and operation pipeline, in order to grasp the existence of defects in the weimore conducive to the safe operation of the pipeline.}lhe ultrascynic detection technology has become the most widely used detection of weld inspection.This article described the status of the oil and gas pipelines, de}elopznent trends and study significanec of the papers. Summary the welding process for pipelinerth weld,groove form and type of defects, hazards and preventive measures introduce the mast commonly NDT methods and their advantages. disadvantages and applicability. Study ultrasonic automatically of the oil and gas pipeline ring weld and manually detectiontechnology, the principle of the detection method, equipment, and the factors that affect the test results. Through the West-Fast second-line automatic ultrasonic test results analysis shows that, its is s;ompletely and contrast automatic and manual detection method, their advantages and disadvantages, the scope of application. Though the laboratory experiments,analyzes and summari2es the influence of the uitras}onic detection probe parameters C frequency, die size, K value) and coupling agents an the detection sensitivity, and proposed how to use the probe and coupling agent, to be able to improve the detection sensitivity, thereby increasing the accuracy of test results. Finally, though test the high-grade steel pipe girth weld ultrasonic testing,}erifiration that, the detection method is accurate,feasible.