GB662169A - Improvements in or relating to apparatus for detecting cracks in metallic structures - Google Patents

Improvements in or relating to apparatus for detecting cracks in metallic structures

Info

Publication number
GB662169A
GB662169A GB574549A GB574549A GB662169A GB 662169 A GB662169 A GB 662169A GB 574549 A GB574549 A GB 574549A GB 574549 A GB574549 A GB 574549A GB 662169 A GB662169 A GB 662169A
Authority
GB
United Kingdom
Prior art keywords
cylinder
fluid
mode
tray
supported
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.)
Expired
Application number
GB574549A
Inventor
David Arthur Evans
Ernest Charles Haywood
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.)
Minister of Supply In Her Majesty S Government
Original Assignee
Minister of Supply In Her Majesty S Government
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 Minister of Supply In Her Majesty S Government filed Critical Minister of Supply In Her Majesty S Government
Priority to GB574549A priority Critical patent/GB662169A/en
Publication of GB662169A publication Critical patent/GB662169A/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
    • G01N27/83—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

Abstract

662,169. Magnetic tests. MINISTER OF SUPPLY. Jan. 18, 1950 [March 2, 1949], No. 5745/49. Class 37. [Also in Group XXXV] Apparatus for detecting flaws in a ferromagnetic cylinder 1, Figs. 1 and 2, comprises a magnet 4, 5, 6 supported in a carriage 12, 13 which is supported by wheels 8, 9, 10, 11 set at an angle so that as the cylinder is rotated, the magnet moves longitudinally of the cylinder; the cylinder is thus magnetically scanned and variations in the local field are detected by any suitable means. In one mode, a tray 14 contains a fluid having a suspension of magnetic powder, so that the cylinder passes through the fluid and the magnetic powder collects along the line of cracks or flaws. A suitable fluid is paraffin or a solution celluloid in acetone, and a suitable powder is iron oxide. In another mode, the tray 14 is replaced by a coil of fine wire, the induced currents being measured. In a final mode, a galvanometer co-operates with an electromagnetic pick-up whose output can be recorded on a cathode-ray oscillograph.
GB574549A 1949-03-02 1949-03-02 Improvements in or relating to apparatus for detecting cracks in metallic structures Expired GB662169A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB574549A GB662169A (en) 1949-03-02 1949-03-02 Improvements in or relating to apparatus for detecting cracks in metallic structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB574549A GB662169A (en) 1949-03-02 1949-03-02 Improvements in or relating to apparatus for detecting cracks in metallic structures

Publications (1)

Publication Number Publication Date
GB662169A true GB662169A (en) 1951-12-05

Family

ID=9801852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB574549A Expired GB662169A (en) 1949-03-02 1949-03-02 Improvements in or relating to apparatus for detecting cracks in metallic structures

Country Status (1)

Country Link
GB (1) GB662169A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164057A2 (en) * 1984-06-08 1985-12-11 Mecapec S.A. Methods and devices for determining surface defects in a rod-shaped ferromagnetic object
CN109110371A (en) * 2018-07-16 2019-01-01 重庆钢铁(集团)有限责任公司 Steel tube flaw detection system discharging portion structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164057A2 (en) * 1984-06-08 1985-12-11 Mecapec S.A. Methods and devices for determining surface defects in a rod-shaped ferromagnetic object
EP0164057A3 (en) * 1984-06-08 1988-05-04 Mecapec S.A. Methods and devices for determining surface defects in a rod-shaped ferromagnetic object
CN109110371A (en) * 2018-07-16 2019-01-01 重庆钢铁(集团)有限责任公司 Steel tube flaw detection system discharging portion structure

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