Eddy current testing method for parameters of metal pipe fittings in the state of probe eccentricity

Abstract

The invention discloses a method and a device for testing the parameters of a metal pipe fitting with electric eddy under the eccentric state of a probe; and the device mainly comprises a signal generator, a power amplifier, an electric eddy probe, a signal conditioning circuit, an acquisition card and a computer data processing system. The device outputs sine wave with the signal generator, and the sine wave is amplified by the power amplifier and drives the electric eddy probe. A signal output by the electric eddy probe enters the computer data processing system after being conditioned by the signal conditioning circuit and acquired by the acquisition card. The computer data processing system preprocesses the acquired signal and sets an initial parameter value to be tested; the simulation result of a probe impedance theory model is compared with an experimental result; an estimated metal pipe fitting parameter is optimized again and again according to the deviation of the simulation result and the experimental result, until the deviation meets relevant requirements; and a final estimated parameter value is output and displayed as a test result. According to the method and the device, no coupler or precise centering device is needed, and a plurality of parameters of the metal pipe fitting can be precisely measured on line under the eccentric state of the probe.

Description

technical field [0001] The invention relates to an eddy current detection method for parameters of metal pipe fittings, in particular to an eddy current detection method and device for parameters of metal pipe fittings in an eccentric state of a probe. It belongs to the technical field of nondestructive testing. Background technique [0002] Metal pipe fittings are widely used in mining equipment, petrochemical, electric power and other industries. For example: steel pipes are the safest and most economical means of transport for liquid and gaseous media in the energy and chemical industries. By the end of 2010, the seamless steel pipes produced in my country accounted for about 60% of the global total. 100% non-destructive testing must be carried out to ensure product quality; the heat exchange tube in the steam generator is the key element of heat exchange, because the tube diameter is small, the tube wall is thin, and it works in a harsh environment, it is the most likely...

AI Technical Summary

Problems solved by technology

This method has high measurement accuracy, but it has very high requirements for the accuracy of the rotating mechanism, and it takes a long time to measure multiple times. The effect of measurement is greatly affected, and the laser measurement method cannot realize the simultaneous measurement of multiple quality parameters of pipe fittings

2. Pneumatic measurement method: This technology is newly developed abroad and introduced into the domestic market in recent years. This measurement method has high precision, safe measurement, and meets the requirements of modern production technology. However, the current market price of this equipment is high, and the system repair cost is expensive. , poor promotion

In practice, due to the limitation of the working environment, it is impossible to use the shaft aligner, or improper operation of the personnel, the situation that the probe and the pipeline are not coaxial often occurs, which ultimately affects the accuracy and reliability of the detection results, and it is impossible to realize simultaneous measurement of multiple quality parameters of the pipeline

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