Transverse and longitudinal wave nondestructive detection method of corrugated tube internal surface and external surface longitudinal cracks

Abstract

The invention discloses a transverse and longitudinal wave nondestructive detection method of corrugated tube internal surface and external surface longitudinal cracks. According to the method, a surface wave probe is placed at the preset position on the outer wall of a corrugated tube to be detected; a main control machine sends a command to an ultrasonic transmitting and receiving card; the ultrasonic transmitting and receiving card generates a target high voltage pulse to excite the surface wave probe to emit ultrasonic waves to the outer wall of the corrugated tube to be detected; the surface wave probe receives the reflected ultrasonic waves; a data acquisition card acquires the ultrasonic wave data received by the surface wave probe and sends to the main control machine; the main control machine transmits the data to a wave form display module; and the wave form display module draws the wave form of the received reflected ultrasonic waves according to the data. According to the present invention, with the method, the corrugated tube cracks generated during the production, the cracks generated during the assembly due to the excessive tight assembly, and the cracks generated in the case of the long term load due to the excessive stress can be detected so as to screen and replace the generated crack failure member and eliminate the potential failure.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a transverse and longitudinal wave nondestructive testing method for longitudinal cracks on the inner and outer surfaces of a threaded pipe. Background technique [0002] The outer surface of the threaded pipe is a smooth cylindrical surface, and the inner surface is an internal thread. Cooperating with the external threads of other parts has the functions of connection, sealing and anticorrosion. Threaded tubes are widely used in mechanical parts, such as T / R components of active phased array radars, dry evaporators of central air conditioners, etc. There are nearly a thousand T / R components distributed on the antenna array of the active phased array radar. According to the needs, the T / R components have power amplifier components with different transmission powers; among them, the maximum heat consumption of a single T / R component is 30W . Due to t...

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Problems solved by technology

This method has a long detection period and low detection efficiency, and is not suitable for batch detection; in addition, the radiation has a harmful effect on personnel, and there are certain safety hazards; after the ferromagnetic component is magnetized, if the component has surface or near-surface defects, it will cause the component to generate magnetism. Leakage, magnetic particle inspection is a detection method to find defects by detecting magnetic leakage; this method can only detect surface and near-surface defects of ferromagnetic materials, which has certain limitations. At the same time, magnetic suspension liquid may cause environmental pollution, which is not conducive to on-site Detection; eddy current detection is based on the principle of electromagnetic induction. The form of eddy current flow generated in an ideal component is certain. If there is a crack in the component, it will inevitably distort the flow of eddy current and affect the secondary magnetic field. Through comparison, try to If these eddy current distortions are detected, it can be judged whether the component has crack damage. This is the principle of eddy current testing, but the detection efficiency of eddy current testing is low, it is not suitable for batch testing, and it can only detect surface and near-surface defects; Based on the principle of capillary action, through the action of penetrant and imaging agent, the morphology and distribution of cracks can be displayed under a certain light source

However, it is only suitable for the detection of open cracks, and has no detection effect on cracks in threaded pipes, and it is also easy to cause environmental pollution; ultrasonic testing is to inject high-frequency sound beams into the material to be tested, and reflect through the interface of different media to analyze the reflected sound beam signal. The presence and location of crack damage can be determined

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