Nondestructive Testing Technology Research Of Pipeline Defect Based On Laser Ultrasonic

Pipelines as an important means of transporting of liquid and gas, once that been damaged which will bring significant influence for national economy and ecological environment as well. The Piping prevention is an important safeguard, and prevention is to defect detection and evaluation in advance.There are many types of the detection techniques of the pipes, ultrasonic testing as the most widely used nondestructive testing method was favored by many researchers.Using the ultrasonic wave propagation in a medium encountered defects and the feature of different sound wave, this paper puts forward an ultrasonic testing research of pipeline defect and.On the basis of many experts and scholars of Ultrasonic Guided Wave theory, and combined with the latest NDT technology development, This article focusing on pipeline defect nondestructive testing has carried on the theoretical analysis and experimental tests verify. First of all, for domestic and international status and achievements in the field, the paper detailed introduces the basic concept and principle of ultrasonic wave and achievements in the field of summary; Secondly, writer had built an effective experimental platform, utilizing the LUVI detector for detecting pipeline and trial. Then an effective experiment platform had been set up, focusing on the method of laser ultrasound in the detection as an incentive, piezoelectric sensor for acceptance of a particular mode of ultrasonic guided wave. Then with artificial pit corrosion, crack and with natural crack defects of the laser ultrasonic visualization pipe samples are measured, the complex shape of T tube and a jacket with a tiny flaw, clear visualization of reliable measuring results are obtained, thus the result can be the recognition of defects and defect basic shapes. Finally, it tests the general pipe, adjust the incoming laser parameters, a series of factors affect the detection results. Through lots of experiments, we get reliable theory basis, through the research of pipeline defect echo characteristics, comparing the echo characteristics of the experimental results, we achieve defect identification and positioning of the pipes.