GB2008259A - Detection of Surface Defects in Elongate Metallic Members - Google Patents

Detection of Surface Defects in Elongate Metallic Members

Info

Publication number
GB2008259A
GB2008259A GB7845652A GB7845652A GB2008259A GB 2008259 A GB2008259 A GB 2008259A GB 7845652 A GB7845652 A GB 7845652A GB 7845652 A GB7845652 A GB 7845652A GB 2008259 A GB2008259 A GB 2008259A
Authority
GB
United Kingdom
Prior art keywords
probe
billet
changes
detection
surface defects
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
GB7845652A
Other versions
GB2008259B (en
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.)
British Steel Corp
Original Assignee
British Steel Corp
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 British Steel Corp filed Critical British Steel Corp
Priority to GB7845652A priority Critical patent/GB2008259B/en
Publication of GB2008259A publication Critical patent/GB2008259A/en
Application granted granted Critical
Publication of GB2008259B publication Critical patent/GB2008259B/en
Expired 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
    • G01N27/9053—Compensating for probe to workpiece spacing

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

Inspection equipment for detecting defects in the surface of steel billets or other elongate members 2 Fig. 1 includes a high- frequency energised eddy-current surface scanning probe 1 which transmits signals having a frequency representative of the surface condition and an amplitude chiefly dependent upon the probe surface spacing, to a dual-channel receiver 4-13. The signals from both channels 5, 6 of the receiver are combined 13 to provide outputs representative of the surface condition compensated for changes in sensitivity resulting from changes in the probe spacing during scanning. Probes 31 Fig. 5, 44 Fig. 6 may be positioned above the plane surfaces and/or the corners of the billet, the latter being positively located through rollers 48 which bear against the two sides of the billet 2 which flank the edge under inspection. <IMAGE>
GB7845652A 1977-11-22 1978-11-22 Detection of surface defects in elongate metallic members Expired GB2008259B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7845652A GB2008259B (en) 1977-11-22 1978-11-22 Detection of surface defects in elongate metallic members

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4859777 1977-11-22
GB7845652A GB2008259B (en) 1977-11-22 1978-11-22 Detection of surface defects in elongate metallic members

Publications (2)

Publication Number Publication Date
GB2008259A true GB2008259A (en) 1979-05-31
GB2008259B GB2008259B (en) 1982-02-24

Family

ID=26266292

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7845652A Expired GB2008259B (en) 1977-11-22 1978-11-22 Detection of surface defects in elongate metallic members

Country Status (1)

Country Link
GB (1) GB2008259B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033618A2 (en) * 1980-01-29 1981-08-12 British Steel Corporation Apparatus for billet surface inspection
EP0033802A2 (en) * 1979-12-07 1981-08-19 Thorburn Technics (International) Limited Eddy current inspection apparatus and probe
EP0034414A2 (en) * 1980-02-14 1981-08-26 British Steel Corporation Surface inspection equipment
GB2137362A (en) * 1983-04-01 1984-10-03 Gen Electric Bracket for an eddy current probe
US4534405A (en) * 1982-02-11 1985-08-13 Voest-Alpine Aktiengesellschaft Method and an arrangement for inspecting the surface of steel stock having a temperature above the Curie point

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033802A2 (en) * 1979-12-07 1981-08-19 Thorburn Technics (International) Limited Eddy current inspection apparatus and probe
EP0033802A3 (en) * 1979-12-07 1981-09-09 Thorburn Technics (International) Limited Eddy current inspection apparatus and probe
EP0033618A2 (en) * 1980-01-29 1981-08-12 British Steel Corporation Apparatus for billet surface inspection
EP0033618A3 (en) * 1980-01-29 1982-01-13 British Steel Corporation Apparatus for billet surface inspection
EP0034414A2 (en) * 1980-02-14 1981-08-26 British Steel Corporation Surface inspection equipment
EP0034414A3 (en) * 1980-02-14 1981-12-30 British Steel Corporation Surface inspection equipment
US4534405A (en) * 1982-02-11 1985-08-13 Voest-Alpine Aktiengesellschaft Method and an arrangement for inspecting the surface of steel stock having a temperature above the Curie point
GB2137362A (en) * 1983-04-01 1984-10-03 Gen Electric Bracket for an eddy current probe
GB2176298A (en) * 1983-04-01 1986-12-17 Gen Electric Bracket for an eddy current probe

Also Published As

Publication number Publication date
GB2008259B (en) 1982-02-24

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19981121