New Tubing Threads NDT System Design And The Simulation Analysis

In modern industrial production, the oil is an important energy source. In oil production and distribution process, the pipeline play an important role. To ensure the normal operation of the pipeline, which is to ensure the security of oil production. This is one of the threaded portion of the tubing to detect the most important step.In this dissertation, under realistic production model most commonly used tubing, combining the actual production environment, for the most common injury conditions, to magnetic flux leakage method, list a set of test programs. First, through analysis and comparison of sets of DC magnetization, AC magnetic and magnetized permanent magnetic and other means, obtained the best test program is magnetic core within the DC excitation. On this basis, determine the internal structure and core magnetization. In this excitation above the Hall element to detect the probe, the location for the most common injury identified around the roots of the most effective detection method for signal detection. Secondly, through the actually data analysis the workpiece to determine the mechanical structure of the detection system, the size of the shape and size. After determining the mechanical structure design of hardware and signal conversion circuit amplifier. The hardware circuit for the Hall element is designed as a test probe. Hardware circuit can effectively amplify the detected signal, and clearly pointed out that the size and location of damage, easy to use, the effect is obviously.Finally, the finite element method of the calculation process and computational principles, through the use of ANSOFT engineering software to achieve the exciter magnetic field strength of the simulation. Calculated results show that the detection scheme is theoretically feasible and reasonable. The simulation results of the nondestructive testing system has some reference value and practical significance.