Study On Ultrasonic Detection Technique For Erosion Damage Of High Pressure Right Angle Bend

The high-pressure manifold is often under the action of high pressure,corrosive fluid corrosion and huge tensile stress during operation,so it is easy to be affected by erosion defects.It is an important means to ensure the safe operation of high-pressure manifold to carry out regular nondestructive testing on the erosion of the manifold.On the basis of a brief introduction to the damage of erosion defects,the generation process of erosion defects and the main factors affecting their generation are discussed in detail.Moreover,by referring to relevant materials,the preventive measures of erosion defects in high-pressure manifold are specifically explained.The experimental subjects are: Erosion simulation was carried out for the high pressure rectangular elbow to be tested,and the specific position of the maximum erosion wear area was analyzed.By referring to a large number of relevant data and analyzing many failure samples in the field,it was concluded that the erosion pits of the rectangular elbow to be tested belonged to parabolic pits.These work for the manual grinding of the following erosion damage defects to do a good reference.Expounds the principle of ultrasonic detection,through the consult of ultrasonic detection method of concrete research at home and abroad,summarizes the advantages and disadvantages of ultrasonic detection method,influence factors and when there is defect ultrasonic propagation in high pressure elbow bend pipe,etc.,the path and the theory of energy for the follow-up to the experimental results of prediction.Adopt function generator,digital oscilloscope and PZT sensor composed of a set of high bending pipe erosion damage detection platform,will be imported into the ultrasonic signal by PZT sensor for measuring high pressure in the right-angle bend,bend under test in sensors,set up four directions on the receiving end receives the ultrasonic signal on the four directions,analysis different paths of changes of the received signal energy to treat progressive measure right-angle bend with grinding to simulate the actual working condition of the process of gradually serious erosion degree,in the process of collecting the multi-group waveform signal,and the received signal is Fourier transform processing,Get waveform in time domain and the energy value,analysis for the bend from nondestructive status to erosion perforation in the process of the change of each group of data,through the analysis found,and the erosion defects as well as the excitation signal on the same horizontal plane linear sensor signal time domain amplitude decreased significantly,the energy is smaller,the other three directions of time-domain sheet value has not obvious increase,the three directions of energy also increases,and the time domain sheet value can reflect the relationship between the size of the four directions on the specific energy of how many relations,it is concluded that the time domain graph exists corresponding relation between the size of the amplitude and energy,And also found defects in the direction of the loss of energy value and added value of the rest of the energy on the three directions nearly equal,the sum of the energy of the four directions decreases as the defect level basically remain unchanged,by ultrasonic propagation characteristics explains the existence erosion wear and tear on the direction of the wave energy why decreases,and speculated that reduce energy may be in front of the the rest of the three directions of PZT sensor is received.The concrete application of this method in engineering practice is summarized.It has practical significance to prevent the erosion failure of high pressure elbow and prolong the service life of high pressure elbow.