Steel tube ultrasonic inspection method capable of simultaneously realizing three functions in one channel

Abstract

The invention relates to a steel tube ultrasonic inspection method capable of simultaneously realizing three functions in one channel, adopting a three-functional probe consisting of a wedge, a piezo ceramic sheet 1, a piezo ceramic sheet 2 and an adjustable resistance; the piezo ceramic sheet 2 is added on the basis of the common angle probe, the function of the piezo ceramic sheet 1 is the samewith the piezo ceramic sheet in the common probe; the piezo ceramic sheet 2 and the wedge form a direct probe with a delaying lump, the piezo ceramic sheet 2 transmits longitudinal waves to steel tubewalls and receives reversed echoes from the inner wall and the outer wall of a steel tube; when the coupling is poor, the reversed echoes Bi of the inner wall of the steel tube is lost or greatly reduced to be lower than the height of a gate, and a monitoring gate W1 sounds an alarm signal; if the wall thickness exceeds the limit, the Bi is moved outside the gate, the W1 also sounds an alarm signal. The invention can automatically monitor the water coupling condition without increasing channels, simultaneously realize the function of monitoring the wall thickness of the steel tube and achievethe purpose that three functions of inspection, coupling monitoring and wall thickness monitoring can be realized by using one channel only.

Description

technical field

[0001] The invention relates to the field of ultrasonic flaw detection of steel pipes, and in particular provides a method for ultrasonic flaw detection of steel pipes in which one channel simultaneously realizes three functions. Background technique

[0002] Steel pipe is an important structural material, mainly used for the transportation of liquid materials, such as high temperature and high pressure water pipes in power plants, various process pipelines in chemical and petrochemical plants, boiler tubes and heat exchanger tubes, oil wells in the petroleum industry Tubes and casings, etc. In the steel pipe production process, due to various contingencies are inevitable, there are defects on the steel pipe wall, such as: longitudinal cracks, transverse cracks, folding, delamination and other defects. In the process of steel pipe use, the conditions are generally harsh. For example, the high-temperature and high-pressure water pipes used in power plants are...

Examples

Embodiment 1

[0020] This embodiment provides a steel pipe ultrasonic flaw detection method with one channel simultaneously realizing three functions. Ceramic sheet 1 2, piezoelectric ceramic sheet 2 3, variable resistor 4;

[0021] The basic structure is based on the general angle probe, adding a piezoelectric ceramic piece 2 3, the function of the piezoelectric ceramic piece 2 is the same as that of the piezoelectric ceramic piece in the ordinary angle probe, and it emits longitudinal waves to the wedge 1 , enters the tube wall after refraction, and has been converted into a transverse wave at this time. If a defect is encountered when the transverse wave propagates forward, it will return to the original path after being reflected by the defect and return to the piezoelectric ceramic piece 1 2, forming a damage echo; piezoelectric ceramic piece 2 3 and the wedge form a straight probe with a delay block, and the piezoelectric ceramic sheet 2 3 emits longitudinal waves to the steel pipe wa...

technical field

[0001] The invention relates to the field of ultrasonic flaw detection of steel pipes, and in particular provides a method for ultrasonic flaw detection of steel pipes in which one channel simultaneously realizes three functions. Background technique

[0002] Steel pipe is an important structural material, mainly used for the transportation of liquid materials, such as high temperature and high pressure water pipes in power plants, various process pipelines in chemical and petrochemical plants, boiler tubes and heat exchanger tubes, oil wells in the petroleum industry Tubes and casings, etc. In the steel pipe production process, due to various contingencies are inevitable, there are defects on the steel pipe wall, such as: longitudinal cracks, transverse cracks, folding, delamination and other defects. In the process of steel pipe use, the conditions are generally harsh. For example, the high-temperature and high-pressure water pipes used in power plants are...

Examples

Embodiment 1

[0020] This embodiment provides a steel pipe ultrasonic flaw detection method with one channel simultaneously realizing three functions. Ceramic sheet 1 2, piezoelectric ceramic sheet 2 3, variable resistor 4;

[0021] The basic structure is based on the general angle probe, adding a piezoelectric ceramic piece 2 3, the function of the piezoelectric ceramic piece 2 is the same as that of the piezoelectric ceramic piece in the ordinary angle probe, and it emits longitudinal waves to the wedge 1 , enters the tube wall after refraction, and has been converted into a transverse wave at this time. If a defect is encountered when the transverse wave propagates forward, it will return to the original path after being reflected by the defect and return to the piezoelectric ceramic piece 1 2, forming a damage echo; piezoelectric ceramic piece 2 3 and the wedge form a straight probe with a delay block, and the piezoelectric ceramic sheet 2 3 emits longitudinal waves to the steel pipe wa...

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