Reference block and flaw detection method for ultrasonic flaw detection of thick-wall high-pressure seamless steel pipe

Abstract

The invention provides a reference block and flaw detection method for ultrasonic flaw detection of a thick-wall high-pressure seamless steel pipe. The reference block comprises a test reference blockand an instrument calibration block; and the test reference block is of a pipe fitting structure and comprises an outer wall V-shaped groove and an inner wall V-shaped groove, and the instrument calibration block is of a platy structure and comprises three through holes. The ultrasonic flaw detection method comprises the steps that an ultrasonic flaw detector is calibrated; the ultrasonic flaw detector is adjusted by taking the test reference block as a criterion; a flaw of the seamless steel pipe is detected; the ultrasonic flaw detector is calibrated again; and the angle position of the flaw on the seamless steel pipe is detected. According to the reference block and the flaw detection method, flaw detection on the interior and the pipe walls of the seamless steel pipe can be more conveniently and more reliably completed, potential quality hazards in the seamless steel pipe are discovered, product quality accidents of a diesel engine are avoided, and the advantages of shortening theoperation time, improving the working efficiency and reducing the operation cost are achieved.

Description

technical field [0001] The invention relates to the quality detection of defects in seamless steel pipes, in particular to a comparison test block and a flaw detection method for ultrasonic flaw detection of thick-walled high-pressure seamless steel pipes, and belongs to the technical field of nondestructive testing. Background technique [0002] There are many hydraulic oil pipes on the marine diesel engine for the delivery of fuel and lubricating oil, many of which are high-pressure oil pipes, such as the main pipe on the booster pump used to output fuel to the fuel distribution block of each cylinder head, the oil pipe is formed by cold drawing The seamless steel pipe is made of carbon steel, the wall thickness is greater than or equal to 9mm, and the maximum working pressure of the pipe is 800bar. With the operation of the main engine in the working state, the oil pipe continues to bear the pulse load of high-pressure fuel oil. Affected by the fatigue effect of the pulse...

AI Technical Summary

Problems solved by technology

With the operation of the main engine in the working state, the oil pipe continues to bear the pulse load of high-pressure fuel oil. Affected by the fatigue effect of the pulse load, the micro cracks on the inner wall of the oil pipe are easy to expand into penetrating cracks, thus threatening the safety of diesel engines and ships.

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