JPS57201848A - Magnetic flaw detection for pipe inside face - Google Patents

Magnetic flaw detection for pipe inside face

Info

Publication number
JPS57201848A
JPS57201848A JP8708581A JP8708581A JPS57201848A JP S57201848 A JPS57201848 A JP S57201848A JP 8708581 A JP8708581 A JP 8708581A JP 8708581 A JP8708581 A JP 8708581A JP S57201848 A JPS57201848 A JP S57201848A
Authority
JP
Japan
Prior art keywords
steel pipe
electromagnet
wide
narrow
range part
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.)
Pending
Application number
JP8708581A
Other languages
Japanese (ja)
Inventor
Shigenori Kamimura
Takeemon Nagashima
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.)
JFE Steel Corp
NOF Corp
Original Assignee
NOF Corp
Kawasaki Steel Corp
Nippon Oil and Fats 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 NOF Corp, Kawasaki Steel Corp, Nippon Oil and Fats Co Ltd filed Critical NOF Corp
Priority to JP8708581A priority Critical patent/JPS57201848A/en
Publication of JPS57201848A publication Critical patent/JPS57201848A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
    • G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE:To detect accurately defects in the axial direction of a wide-range part of a steel pipe having a proper magnetic field, by arranging a rectangular electromagnet in the steel pipe eccentrically toward one side. CONSTITUTION:An electromagnet 6 is arranged in a steel pipe 1 so that a magnetic pole 6a is parallel with the axial direction of the steel pipe 1 and the electromagnet 6 is deflected to one side from a center axis 11 not to be brought into contact with the inside face of the steel pipe 1. By this arrangement, the inside of the steel pipe 1 is divided to a narrow arc part in one side of the electromagnet 6, namely, a narrow-range part A and a wide arc part in the other side, namely, a wide-range part B. When an AC current is supplied to a coil 7 of the electromagnet 6 to make the narrow-range part A saturated magnetically by a magnetic flux 12 and a proper magnetic field is given to the wide- range part B by a magnetic flux 13, the magnetic powder pattern of a defective part 5 is formed accurately because the fluorescent magnetic powder scattered from a nozzle 10 is scattered in the proper magnetic field.
JP8708581A 1981-06-06 1981-06-06 Magnetic flaw detection for pipe inside face Pending JPS57201848A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8708581A JPS57201848A (en) 1981-06-06 1981-06-06 Magnetic flaw detection for pipe inside face

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8708581A JPS57201848A (en) 1981-06-06 1981-06-06 Magnetic flaw detection for pipe inside face

Publications (1)

Publication Number Publication Date
JPS57201848A true JPS57201848A (en) 1982-12-10

Family

ID=13905102

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8708581A Pending JPS57201848A (en) 1981-06-06 1981-06-06 Magnetic flaw detection for pipe inside face

Country Status (1)

Country Link
JP (1) JPS57201848A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003270210A (en) * 2002-03-15 2003-09-25 Osaka Gas Co Ltd Piping inspection method and magnetic flux leakage detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003270210A (en) * 2002-03-15 2003-09-25 Osaka Gas Co Ltd Piping inspection method and magnetic flux leakage detector

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