A Method for Eliminating False Reports of Flaw Detection by Ultrasonic Flaw Detection Unit of Steel Pipe

Abstract

The present invention discloses a method for eliminating steel pipe ultrasonic flaw detection unit flaw detection misinformation. The method comprises that (1) the incidence angle of a flaw detection probe is adjusted to a suitable value, wherein the suitable value is corresponding to the highest value of the reflected wave of sample pipe artificial injury; (2) the suitable value is checked, the suitable value is fixed as the incidence angle of the flaw detection probe and a step (3) is performed if the checking result is qualified, and if the checking result is not qualified, the process returns to the step (1); and (3) a steel pipe is subjected to flaw detection by using the flaw detection probe having the fixed incidence angle. According to the present invention, with the method, when the mechanical concentricity of the flaw detection unit is subjected to fluctuation, the minimization of the circumferential sensitivity difference fluctuation of the flaw equipment can be ensured, and the fluctuation range of the circumferential sensitivity difference of the flaw equipment is reduced, such that the flaw detection unit misinformation during the flaw detection process is effectively eliminated, the repeated flaw detection of the pipe is avoided, the work efficient of the flaw detection unit is improved, and the normal operation of the subsequent process is ensured.

Description

technical field [0001] The invention relates to a flaw detection method, in particular to a steel pipe flaw detection method. Background technique [0002] At present, steel pipe manufacturers at home and abroad will configure some non-destructive testing equipment for quality inspection on the steel pipe production line. At present, the best configuration of the domestic seamless steel pipe factory on the steel pipe flaw detection inspection line usually uses a multi-functional flaw detection unit (ultrasonic flaw detection + eddy current flaw detection) to detect the pipe body of the steel pipe, and uses a pipe end magnetic particle flaw detection unit to detect the blind area at the pipe end part. The problem existing in the existing flaw detection inspection line is: the difference between the total flaw detection amount and the actual feeding amount is relatively large. Take a steel pipe production enterprise with two steel pipe ultrasonic flaw detection inspection li...

AI Technical Summary

Problems solved by technology

The problem existing in the existing flaw detection inspection line is that there is a large difference between the total flaw detection amount and the actual feeding amount

For example, in the prior art, the flaw detection mode in which the probe rotates and the steel pipe is conveyed in a straight line is usually adopted; when the circumferential sensitivity difference of the rotating steel pipe ultrasonic flaw detection equipment exceeds the specified value, it usually relies on adjusting the concentricity of the flaw detection unit to reduce the size of the equipment. However, this method usually cannot completely eliminate the poor circumferential sensitivity of the equipment. The reason is that the mechanical precision (concentricity) of the equipment cannot be adjusted to zero error, and during the flaw detection process, the bending of the steel pipe head and tail will also cause The circumferential sensitivity difference in the flaw detection process fluctuates, causing head and tail false alarms in the flaw detection process

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