SU1254373A1 - Method of tuning ultrasonic flaw detector - Google Patents

Abstract

The invention relates to non-destructive testing of products using ultrasound and can be used to control particularly thin-walled pipes having, in particular, a small internal diameter. The purpose of the invention is to simplify the setup of an ultrasonic flaw detector when inspecting thin-walled pipes with a small internal diameter. When setting up an ultrasonic flaw detector with a standard sample with a normalized and non-normalized reflector m1, the non-normalized reflector uses structural inhomogeneities of the material of the test sample, the value of the echo signals from which is equal to the size of the defect. c & S to ate. 1Y from 00

Description

one

The invention relates to the in-line inspection of products using ultrasound and can be used to control especially thin-walled pipes having, in particular, a small internal diameter.

The purpose of the invention is to supervise the development of an ultrasonic flaw detector while monitoring thin-walled pipes with a small internal diameter.

The setting method of the ultrasonic flaw detector is as follows.

In the area of the piezoelectric transducer connected to the ultrasonic flaw detector, a torsional sample from a material with an unacceptable grain mark and with a normalized reflector made in it is placed .. Excite the normal symmetric waves S in the sample and scan the test sample until the de- peakoscopy of maximum amplitude. of the echo signal from the normalized reflector. In this case, the maximum signal can be obtained at angles of input of ultrasonic vibrations into the sample equal to 19-21 °. It is at these input angles in the specimen that the excitation is; a normal, symmetric wave d is given. Then, the sensitivity of the ultrasonic flaw detector to external defects was determined by the maximum amplitude of the echo signal obtained from the normal reflector. After that, without changing the sensitivity of the flaw detector, the normalized reflector is removed from the external Hbrii control zone, the normal antisymmetric waves q are excited in the test sample and the sample is scanned by changing the angle of entry of the ultrasound x oscillations, in the range of 30-45 to obtain the maximum value echo signals from structural inhomogeneities (grains)

sample material. Then, the flaw detector is configured on the received 1GYM. When the sensitivity to external defects is set, it automatically provides the necessary sensitivity, to internal

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defects of the controlled product.

At the same time, the material of the test sample must have an unacceptable grade of grain, i.e. The magnitude of structural inhomogeneities (grains) of sample material 7 should be such that the magnitude of the echo signals from them is equal to the magnitude of the echo signal from an unacceptable internal defect. With

10 settings use echoes, reflected from the grains of the sample material, trapped in the raster of the beam of ultrasonic vibrations, and, as a rule, use the maximum reflection

15 from several grains of material of the test sample.

Thus, this method, compared with the known ones, greatly simplifies the process of setting up a defect of 20 s, a cop, due to the elimination of the laborious and expensive process of manufacturing test samples with defects on the inner surface of pipes and, therefore, facilitates the control

25 tubes of small dia. Meter, turn on capillary tubes.

-F o rmu l invention

0 The method of tuning the ultrasonic flaw detector according to a test sample with normalized and non-normalized reflectors, consisting in that excitement of the sim in the sample. metric norms, S waves,

scan the sample until the maximum amplitude of the echo signal from the normalized reflector is obtained; then, no sensitivity changes, excite the antisymmetric normal waves a, scan the sample until the maximum amplitude of the echo signal from the unnormalized reflector is received, the setting of the flaw detector for the aphid This is the case so that, in order to simplify the adjustment, as a non-normalized reflector, structural inhomogeneities of the material of the test sample are used, the magnitude of the echo signal in which the value is equal to one of the signal from the unacceptable defect.

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Claims (1)

Claim 30 A method of tuning an ultrasonic flaw detector according to a test sample with normalized and non-normalized reflectors, which means that symmetric normal waves S _{o are} excited in the sample, scan the sample to obtain the maximum amplitude of the echo signal from the normalized reflector, then, without changing the sensitivity, excite antisymmetric normal waves a, scan the sample to obtain the maximum amplitude of the echo signal from the unnormalized reflector and, according to the obtained parameters, set up defect detectors Opa, characterized in that, in order to simplify the adjustment, structural irregularities of the material of the test sample are used as an unnormalized reflector, the magnitude of the echo from which is equal to the magnitude of the echo from an unacceptable defect. ВНИИПИ Order 4713/47 Circulation 778 Subscription Custom polygon. ave, city of Uzhhorod, st. Design> T, ~~ 4