FR2426903A1 - Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects - Google Patents

Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects

Info

Publication number
FR2426903A1
FR2426903A1 FR7815588A FR7815588A FR2426903A1 FR 2426903 A1 FR2426903 A1 FR 2426903A1 FR 7815588 A FR7815588 A FR 7815588A FR 7815588 A FR7815588 A FR 7815588A FR 2426903 A1 FR2426903 A1 FR 2426903A1
Authority
FR
France
Prior art keywords
prods
defects
soln
substance
coated
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
FR7815588A
Other languages
French (fr)
Other versions
FR2426903B1 (en
Inventor
E F Gavrilin
A N Belokur
A L Daiker
V V Basov
A E Konash
N F Moskvin
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.)
INST METALLURG
Original Assignee
INST METALLURG
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 INST METALLURG filed Critical INST METALLURG
Priority to FR7815588A priority Critical patent/FR2426903A1/en
Publication of FR2426903A1 publication Critical patent/FR2426903A1/en
Application granted granted Critical
Publication of FR2426903B1 publication Critical patent/FR2426903B1/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
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The surface of the rolled prod. is coated with a substance (A) forming a background for a second substance (B) which changes colour when heated. High frequency heating is then used so that defects on or near the surface of the prod. cause a thermochemical change in substance (B) altering its colour so the defects are clearly visible. When substance (B) is used as a soln., drying is pref. used for coating (B) at a temp. below that causing its colour to change. Substances (A,B) may alternatively be combined in an aq. colloidal suspension, contg. 30-160 g/l KOH in soln. and 5-20 g/l soluble potato starch. Used for inspection of ingots and slabs which still have a scaled surface due to hot rolling, or for examining profiles, e.g. rails or girders. The invention can be used without prior surface treatment of the rolled prods.
FR7815588A 1978-05-25 1978-05-25 Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects Granted FR2426903A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7815588A FR2426903A1 (en) 1978-05-25 1978-05-25 Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7815588A FR2426903A1 (en) 1978-05-25 1978-05-25 Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects

Publications (2)

Publication Number Publication Date
FR2426903A1 true FR2426903A1 (en) 1979-12-21
FR2426903B1 FR2426903B1 (en) 1981-05-08

Family

ID=9208690

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7815588A Granted FR2426903A1 (en) 1978-05-25 1978-05-25 Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects

Country Status (1)

Country Link
FR (1) FR2426903A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE907946C (en) * 1950-08-25 1954-04-01 Aral Ag B V Method for testing tubular metal workpieces for defects, especially for longitudinal cracks
US3871212A (en) * 1973-05-04 1975-03-18 Goodyear Tire & Rubber System and method for monitoring quality characteristics of a moving web

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE907946C (en) * 1950-08-25 1954-04-01 Aral Ag B V Method for testing tubular metal workpieces for defects, especially for longitudinal cracks
US3871212A (en) * 1973-05-04 1975-03-18 Goodyear Tire & Rubber System and method for monitoring quality characteristics of a moving web

Also Published As

Publication number Publication date
FR2426903B1 (en) 1981-05-08

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