JPS6426144A - Flaw detecting method for ferromagnetic material pipe - Google Patents

Flaw detecting method for ferromagnetic material pipe

Info

Publication number
JPS6426144A
JPS6426144A JP62183084A JP18308487A JPS6426144A JP S6426144 A JPS6426144 A JP S6426144A JP 62183084 A JP62183084 A JP 62183084A JP 18308487 A JP18308487 A JP 18308487A JP S6426144 A JPS6426144 A JP S6426144A
Authority
JP
Japan
Prior art keywords
eddy current
flaw detection
flaw
defect
current flaw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62183084A
Other languages
Japanese (ja)
Other versions
JP2595251B2 (en
Inventor
Yasuharu Hosohara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Gas Co Ltd
Original Assignee
Tokyo Gas Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokyo Gas Co Ltd filed Critical Tokyo Gas Co Ltd
Priority to JP62183084A priority Critical patent/JP2595251B2/en
Publication of JPS6426144A publication Critical patent/JPS6426144A/en
Application granted granted Critical
Publication of JP2595251B2 publication Critical patent/JP2595251B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE:To detect a defect of a pipe together with its kind by executing an eddy current flaw detection by two high and low frequencies, and using OR of a result of the respective flaw detections, as a flaw detecting output. CONSTITUTION:Signals of two high and low frequencies are supplied from a device body 5 to a coil 5 for eddy current flaw detection provided on the periphery of a base body 1, and at every respective frequencies, an eddy current flaw detection is executed by eddy current flaw detecting means 6u, 6e. Also, to a DC magnetizing coil 7, a DC current is supplied from a DC current supply means 8, and a ferromagnetic material pipe 2 is brought to a magnetic saturation. Subsequently, a cable moving device is operated, and an eddy current flaw detection is executed by operating the DC current supply means 8 and an eddy current flaw detecting means 6, while moving the base body 1 through a cable. The frequency by which an S/N of a detecting output of a defect becomes maximum against a flaw detection frequency is different by decreased thickness and a through-hole, namely, the kind of the defect, therefore, OR of a result of flaw detection of every two high and low frequencies corresponding to each of the kind of the detect becomes a flow detecting output.
JP62183084A 1987-07-22 1987-07-22 Flaw detection method for ferromagnetic piping Expired - Fee Related JP2595251B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62183084A JP2595251B2 (en) 1987-07-22 1987-07-22 Flaw detection method for ferromagnetic piping

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62183084A JP2595251B2 (en) 1987-07-22 1987-07-22 Flaw detection method for ferromagnetic piping

Publications (2)

Publication Number Publication Date
JPS6426144A true JPS6426144A (en) 1989-01-27
JP2595251B2 JP2595251B2 (en) 1997-04-02

Family

ID=16129482

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62183084A Expired - Fee Related JP2595251B2 (en) 1987-07-22 1987-07-22 Flaw detection method for ferromagnetic piping

Country Status (1)

Country Link
JP (1) JP2595251B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101066681B1 (en) * 2005-10-31 2011-09-21 수미도모 메탈 인더스트리즈, 리미티드 Method for measuring s/n ratio in eddy current scratch on inner surface of tube
CN113970593A (en) * 2021-09-16 2022-01-25 南京晨光集团有限责任公司 Inside and outside wear combined type vortex automatic check out test set

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5138713B2 (en) * 2010-02-22 2013-02-06 日立Ｇｅニュークリア・エナジー株式会社 Eddy current inspection device and eddy current inspection method
KR101679520B1 (en) 2015-12-02 2016-11-24 한국가스공사 The defect's the width of a pipe measurement system using multi channel RFECT and measurement method using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61182848U (en) * 1985-05-02 1986-11-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61182848U (en) * 1985-05-02 1986-11-14

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101066681B1 (en) * 2005-10-31 2011-09-21 수미도모 메탈 인더스트리즈, 리미티드 Method for measuring s/n ratio in eddy current scratch on inner surface of tube
CN113970593A (en) * 2021-09-16 2022-01-25 南京晨光集团有限责任公司 Inside and outside wear combined type vortex automatic check out test set

Also Published As

Publication number Publication date
JP2595251B2 (en) 1997-04-02

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees