SU868538A1 - Method of non-destructive testing of magnetisable materials - Google Patents
Method of non-destructive testing of magnetisable materials Download PDFInfo
- Publication number
- SU868538A1 SU868538A1 SU772490687A SU2490687A SU868538A1 SU 868538 A1 SU868538 A1 SU 868538A1 SU 772490687 A SU772490687 A SU 772490687A SU 2490687 A SU2490687 A SU 2490687A SU 868538 A1 SU868538 A1 SU 868538A1
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- USSR - Soviet Union
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- magnetized
- destructive testing
- ultrasonic vibrations
- materials
- defects
- Prior art date
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
(54) СПОСОБ НЕРАЗРУШАЮЩЕГО КОНТРОЛЯ НАМАГНИЧИВАЮЩИХСЯ Изобретение относитс к неразруша щему контролю и может быть использовано дл вы влени дефектов в издели х из магнитных материалов. Известны способы магнитной дефектоскопии , заключающиес в намагничивании объекта контрол и регистрации потоков рассе ни от дефектов с помощью преобразователей посто нного магнитного пол в электрический сигнал 1, Недостаток способа состоит в низкой надежности контрол , обусловленной его малой чувствительностью к подповерхностным дефектам. Наиболее близким к предлагаемому по технической сущности вл етс способ неразрушающего контрол намаг ничитвакнцихс материалов, заключающийс в том, что материал йамагничи .вают, с помощью ультразвуковых колебаний преобразуют статическое магнит ное поле в переменное и по последнему суд т о иаличии дефектов Czj.(54) METHOD OF NON-DESTRUCTIVE MONITORING OF MAGNETICALLY The invention relates to non-destructive testing and can be used to detect defects in articles made of magnetic materials. Methods are known for magnetic flaw detection, which consists in magnetizing an object of control and recording streams of scattering from defects using converters of a constant magnetic field into an electrical signal 1. The disadvantage of this method is the low reliability of control due to its low sensitivity to subsurface defects. The closest to the proposed technical essence is a method of non-destructive control of magnetizing materials, consisting in the fact that the material is magnetized, by means of ultrasonic vibrations they convert the static magnetic field into an alternating one and the last occurrence of defects Czj.
МАТЕРИАЛОВ Однако и этот способ не обеспечивает необходимой надежности контрол , так как предполагает наличие акустического контакта излучател ультразвука с контролируемым изделием. Цель изобретени - повышение надежности контрол . Поставленна цель достигаетс тем, что на поверхности контролируемого материала помещают намагничивающийс слой из материала с высокой магнито стрикционной константой и магнитной проницаемостью и в нем возбуждают ультразвуковые колебани . Кроме того, намаг ичивакщийс слой дополнительно намагничивают, по крайней мере в зоне приемника, до величины , соответствующей максимуму коэффициента магнитоупругой св зи, и периодически размагничивают его. На чертеже представлено устройство л реализации предлагаемого способа. Устройство состоит из намагничивающей cиcтe al н агничивакщегос MATERIALS However, this method does not provide the necessary reliability of control, as it implies the presence of acoustic contact of the ultrasound emitter with the controlled product. The purpose of the invention is to increase the reliability of the control. The goal is achieved by placing a magnetizable layer of a material with a high magnetostriction constant and magnetic permeability on the surface of the material under test, and ultrasonic vibrations are excited in it. In addition, the magnetizing layer is additionally magnetized, at least in the receiver zone, to a value corresponding to the maximum of the magnetoelastic coupling coefficient, and periodically demagnetize it. The drawing shows the device l implementation of the proposed method. The device consists of a magnetizing system of al n antifungal
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772490687A SU868538A1 (en) | 1977-06-01 | 1977-06-01 | Method of non-destructive testing of magnetisable materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772490687A SU868538A1 (en) | 1977-06-01 | 1977-06-01 | Method of non-destructive testing of magnetisable materials |
Publications (1)
Publication Number | Publication Date |
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SU868538A1 true SU868538A1 (en) | 1981-09-30 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU772490687A SU868538A1 (en) | 1977-06-01 | 1977-06-01 | Method of non-destructive testing of magnetisable materials |
Country Status (1)
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SU (1) | SU868538A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520120A1 (en) * | 1982-01-15 | 1983-07-22 | Inst Razrabotke Nerazrushaj | MAGNETO-ACOUSTIC TRANSDUCER FOR ULTRA-SOUND DEFECTOSCOPE |
DE4116208A1 (en) * | 1991-05-17 | 1992-11-19 | Karlheinz Dr Ing Schiebold | Non-destructive testing of material at structural parts of cast iron@ - using ultrasonic speed and magnetic coercivity field strength measurement with condition that speed is determined during magnetisation of workpiece |
-
1977
- 1977-06-01 SU SU772490687A patent/SU868538A1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2520120A1 (en) * | 1982-01-15 | 1983-07-22 | Inst Razrabotke Nerazrushaj | MAGNETO-ACOUSTIC TRANSDUCER FOR ULTRA-SOUND DEFECTOSCOPE |
DE4116208A1 (en) * | 1991-05-17 | 1992-11-19 | Karlheinz Dr Ing Schiebold | Non-destructive testing of material at structural parts of cast iron@ - using ultrasonic speed and magnetic coercivity field strength measurement with condition that speed is determined during magnetisation of workpiece |
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