FR2342498A1 - Magnetic flux inspection of seam welded pipes - using sensors designed to minimise disturbing effect of welded seam - Google Patents

Magnetic flux inspection of seam welded pipes - using sensors designed to minimise disturbing effect of welded seam

Info

Publication number
FR2342498A1
FR2342498A1 FR7705140A FR7705140A FR2342498A1 FR 2342498 A1 FR2342498 A1 FR 2342498A1 FR 7705140 A FR7705140 A FR 7705140A FR 7705140 A FR7705140 A FR 7705140A FR 2342498 A1 FR2342498 A1 FR 2342498A1
Authority
FR
France
Prior art keywords
seam
probes
welded
magnetic flux
inspection
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
FR7705140A
Other languages
French (fr)
Other versions
FR2342498B3 (en
Inventor
Friedrich Forster
Alfons Kalisch
Hans Luz
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.)
Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
Original Assignee
Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
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 Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG filed Critical Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
Publication of FR2342498A1 publication Critical patent/FR2342498A1/en
Application granted granted Critical
Publication of FR2342498B3 publication Critical patent/FR2342498B3/fr
Granted 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
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • 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
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9013—Arrangements for scanning
    • G01N27/902—Arrangements for scanning by moving the sensors

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

The workpiece moves longitudinally through sets of probes which travel periodically in a transverse direction, and differential signal voltages are created by the probes. The probes consist of two longitudinal rows, each contg. eight sensors aligned in the same direction as the welded seam; and the sensors in each row are connected in pairs to obtain the differential voltages. One pref. method of connection is to join alternate probes, i.e. in a row a-h, the connections are ac, bd, ce, etc. The pref. inspection appts. uses a rotating head contg. the two rows of probes which feed signals to an electronic circuits. Used for the inspection of seam welded pipe using the tray magnetic flux method. The invention reduces the disturbance due to the seam to 1/2-1/20th of that in known appts. so defects of 5% of the wall thickness are detected with certainty.
FR7705140A 1976-02-26 1977-02-22 Magnetic flux inspection of seam welded pipes - using sensors designed to minimise disturbing effect of welded seam Granted FR2342498A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762607783 DE2607783C3 (en) 1976-02-26 1976-02-26 Method and arrangement for magnetic or magnetic inductive fault testing of elongated metallic test material

Publications (2)

Publication Number Publication Date
FR2342498A1 true FR2342498A1 (en) 1977-09-23
FR2342498B3 FR2342498B3 (en) 1979-10-19

Family

ID=5970910

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7705140A Granted FR2342498A1 (en) 1976-02-26 1977-02-22 Magnetic flux inspection of seam welded pipes - using sensors designed to minimise disturbing effect of welded seam

Country Status (3)

Country Link
JP (1) JPS52119285A (en)
DE (1) DE2607783C3 (en)
FR (1) FR2342498A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2515353A1 (en) * 1981-10-27 1983-04-29 Siderurgie Fse Inst Rech METHOD OF DETECTING DEFECTS OF A METAL PRODUCT BY CURRENT FOUCAULT
EP0226073A1 (en) * 1985-11-25 1987-06-24 Bengt Hjalmar Törnblom Device for measuring and/or testing of objects

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3132808C2 (en) * 1981-08-19 1984-01-26 Nukem Gmbh, 6450 Hanau "Device for the non-destructive testing of ferromagnetic bodies"
DE102019219743A1 (en) * 2019-12-16 2021-06-17 PLR Prüftechnik Linke & Rühe GmbH Method for characterizing a weld seam

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5077081A (en) * 1971-03-04 1975-06-24
JPS5126080B2 (en) * 1971-11-17 1976-08-04

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2515353A1 (en) * 1981-10-27 1983-04-29 Siderurgie Fse Inst Rech METHOD OF DETECTING DEFECTS OF A METAL PRODUCT BY CURRENT FOUCAULT
EP0078198A1 (en) * 1981-10-27 1983-05-04 Institut De Recherches De La Siderurgie Francaise (Irsid) Method of detecting flaws in a metallic product using eddy currents
EP0226073A1 (en) * 1985-11-25 1987-06-24 Bengt Hjalmar Törnblom Device for measuring and/or testing of objects

Also Published As

Publication number Publication date
DE2607783A1 (en) 1977-10-13
JPS52119285A (en) 1977-10-06
FR2342498B3 (en) 1979-10-19
DE2607783C3 (en) 1979-12-20
DE2607783B2 (en) 1979-04-26

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