GB1296257A - - Google Patents

Info

Publication number
GB1296257A
GB1296257A GB1296257DA GB1296257A GB 1296257 A GB1296257 A GB 1296257A GB 1296257D A GB1296257D A GB 1296257DA GB 1296257 A GB1296257 A GB 1296257A
Authority
GB
United Kingdom
Prior art keywords
crawler
signal
coils
electromagnet
pipe
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
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 filed Critical
Publication of GB1296257A publication Critical patent/GB1296257A/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
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/18—Investigating the presence of flaws defects or foreign matter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Toxicology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • X-Ray Techniques (AREA)

Abstract

1296257 Inductive signalling PICKERANDREX X-RAY AS 30 Sept 1970 [1 Oct 1969] 46445/70 Heading H4U An apparatus for controlling equipment mounted on a motor-driven crawler displaceable inside a pipe R comprises an electromagnet EM which is placed on the outside of the pipe in a predetermined position relative to a welded seam W and energized with alternating current from a source G. A detector is mounted on the crawler and comprises three iron-cored coils Sa, Sb, Sc, which via amplifiers and limiters Fa, Fb, Fc, and rectifiers Ea, Eb, Ec, apply two-state signals to a logic circuit LE which are coded in accordance with the positions of the coils relative to the electromagnet EM. In operation, when the crawler reaches the desired position as shown, coils Sa, Sc will produce an output and Sb no output and this signal 101 via lead g will stop the motor M. Then the switch A is opened and closed a predetermined number of times, producing the signal 000 at each closure, whereby the logic circuit LE supplies a signal d and brings X-ray equipment RU into use for a predetermined time to test the quality of the weld. The magnet EM is then moved in the required direction of movement and the crawler is set in motion again. Outputs e, f control the return and forward runs respectively. To increase the accuracy of the stopping position, the centre channel is arranged to have a smaller time constant in the smoothing circuit Eb than in the smoothing circuits Ea, Ec of the other channels.
GB1296257D 1969-10-01 1970-09-30 Expired GB1296257A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK522769 1969-10-01

Publications (1)

Publication Number Publication Date
GB1296257A true GB1296257A (en) 1972-11-15

Family

ID=8140610

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1296257D Expired GB1296257A (en) 1969-10-01 1970-09-30

Country Status (2)

Country Link
US (1) US3702934A (en)
GB (1) GB1296257A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663123A1 (en) * 1990-06-08 1991-12-13 Ca Atomic Energy Ltd FOURCAULT CURRENT PROBE COMPRISING BRACELETS OF GALETTE COILS FOR DETECTING INTERNAL DEFECTS IN FERROMAGNETIC TUBES.
FR2668830A1 (en) * 1990-11-07 1992-05-07 Anglo Amer Corp South Africa ELECTROMAGNETIC CONTROL OF A METAL CABLE.
GB2355622A (en) * 1999-07-22 2001-04-25 Jme Ltd Signalling through steel walls

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752537B2 (en) * 1973-02-17 1982-11-08
DE2612993C3 (en) * 1976-03-26 1979-07-12 Zumbach Electronic Ag, Orpund (Schweiz) Device for testing the wall thickness of a pipe
IT1213979B (en) * 1987-08-04 1990-01-05 Franco Fratta DEVICE FOR THE AUTOMATIC CONTROL AND POSITIONING OF TROLLEYS FOR THE RADIOGRAPHY OF PIPE WELDING
GB9100589D0 (en) * 1991-01-11 1991-02-27 Technical Software Consultants A.c.field measurement testing system
US5698854A (en) * 1996-05-20 1997-12-16 Omega International Technology, Inc. Method and apparatus for inspecting pipes
CN103901097A (en) * 2014-04-05 2014-07-02 国家电网公司 Method for detecting incomplete root penetration of ferromagnetic thin wall pipe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3492477A (en) * 1966-02-28 1970-01-27 Tore Arnesen Method and apparatus for examining hollow bodies

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663123A1 (en) * 1990-06-08 1991-12-13 Ca Atomic Energy Ltd FOURCAULT CURRENT PROBE COMPRISING BRACELETS OF GALETTE COILS FOR DETECTING INTERNAL DEFECTS IN FERROMAGNETIC TUBES.
FR2668830A1 (en) * 1990-11-07 1992-05-07 Anglo Amer Corp South Africa ELECTROMAGNETIC CONTROL OF A METAL CABLE.
GB2355622A (en) * 1999-07-22 2001-04-25 Jme Ltd Signalling through steel walls

Also Published As

Publication number Publication date
US3702934A (en) 1972-11-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents