EP0156545A3 - Heat treatment with an autoregulating heater - Google Patents

Heat treatment with an autoregulating heater Download PDF

Info

Publication number
EP0156545A3
EP0156545A3 EP85301501A EP85301501A EP0156545A3 EP 0156545 A3 EP0156545 A3 EP 0156545A3 EP 85301501 A EP85301501 A EP 85301501A EP 85301501 A EP85301501 A EP 85301501A EP 0156545 A3 EP0156545 A3 EP 0156545A3
Authority
EP
European Patent Office
Prior art keywords
magnetic material
autoregulated
article
temperature
heating
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
EP85301501A
Other versions
EP0156545A2 (en
EP0156545B1 (en
Inventor
Rodney L. Derbyshire
Paul F. Busch
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.)
Metcal Inc
Original Assignee
Metcal Inc
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 Metcal Inc filed Critical Metcal Inc
Priority to AT85301501T priority Critical patent/ATE56476T1/en
Publication of EP0156545A2 publication Critical patent/EP0156545A2/en
Publication of EP0156545A3 publication Critical patent/EP0156545A3/en
Application granted granted Critical
Publication of EP0156545B1 publication Critical patent/EP0156545B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Articles (AREA)
  • General Induction Heating (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Soft Magnetic Materials (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Processing Of Meat And Fish (AREA)

Abstract

Apparatus and process for selectively heat treating at least a portion of an article in the field with autoregulated heating. The autoregulated heating is provided by a heater including at least a first magnetic material disposed along the portion of the article to be heat treated. The first magnetic material has a magnetic permeability which sharply changes at temperatures at or near the autoregulating (AR) temperature thereof. The changes in permeability result in corresponding changes in the skin depth of the first magnetic material and, hence, the heating produced therein responsive to a.c. current passing therethrough. By maintaining the a.c. current constant in amplitude and frequency, the first magnetic material and the portion of the article are regulated at substantially the AR temperature of the first magnetic material. By selecting the first magnetic material to have AR temperature substantially corresponding to the temperature at which metal anneals, tempers, hardens, softens, stress relieves or the like, heat treating at an autoregulated temperature is achieved. The autoregulated heater can be incorporated into the article or can be applied to the article thereafter, in each case permitting in field heat treating. Autoregulated heating can also be achieved by any of various multilayer structures to provide desired autoregulation effects.
EP85301501A 1984-03-06 1985-03-05 Heat treatment with an autoregulating heater Expired - Lifetime EP0156545B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85301501T ATE56476T1 (en) 1984-03-06 1985-03-05 HEAT TREATMENT PROCESS WITH SELF-REGULATORY HEATER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58671984A 1984-03-06 1984-03-06
US586719 1984-03-06

Publications (3)

Publication Number Publication Date
EP0156545A2 EP0156545A2 (en) 1985-10-02
EP0156545A3 true EP0156545A3 (en) 1987-05-13
EP0156545B1 EP0156545B1 (en) 1990-09-12

Family

ID=24346880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85301501A Expired - Lifetime EP0156545B1 (en) 1984-03-06 1985-03-05 Heat treatment with an autoregulating heater

Country Status (6)

Country Link
EP (1) EP0156545B1 (en)
JP (1) JPH0656793B2 (en)
AT (1) ATE56476T1 (en)
CA (1) CA1265419A (en)
DE (1) DE3579605D1 (en)
WO (1) WO1985004069A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4814587A (en) * 1986-06-10 1989-03-21 Metcal, Inc. High power self-regulating heater
JPH0760017B2 (en) * 1986-07-07 1995-06-28 チッソエンジニアリング株式会社 Electric fluid heater
DE102011009947A1 (en) * 2011-02-01 2012-08-02 Rwe Technology Gmbh Process for the heat treatment of welds on power plant components

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091813A (en) * 1975-03-14 1978-05-30 Robert F. Shaw Surgical instrument having self-regulated electrical proximity heating of its cutting edge and method of using the same
US4256945A (en) * 1979-08-31 1981-03-17 Iris Associates Alternating current electrically resistive heating element having intrinsic temperature control
WO1982003148A1 (en) * 1981-03-02 1982-09-16 Ass Iris Electrically resistive heating element having temperature control
WO1982003305A1 (en) * 1981-03-16 1982-09-30 Ass Iris Shielded heating element having intrinsic temperature control

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE518744A (en) * 1952-03-28
US4001054A (en) * 1974-04-10 1977-01-04 Makepeace Charles E Process for making metal pipe
US4229235A (en) * 1977-10-25 1980-10-21 Hitachi, Ltd. Heat-treating method for pipes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091813A (en) * 1975-03-14 1978-05-30 Robert F. Shaw Surgical instrument having self-regulated electrical proximity heating of its cutting edge and method of using the same
US4256945A (en) * 1979-08-31 1981-03-17 Iris Associates Alternating current electrically resistive heating element having intrinsic temperature control
WO1982003148A1 (en) * 1981-03-02 1982-09-16 Ass Iris Electrically resistive heating element having temperature control
WO1982003305A1 (en) * 1981-03-16 1982-09-30 Ass Iris Shielded heating element having intrinsic temperature control

Also Published As

Publication number Publication date
EP0156545A2 (en) 1985-10-02
CA1265419A (en) 1990-02-06
JPH0656793B2 (en) 1994-07-27
DE3579605D1 (en) 1990-10-18
WO1985004069A1 (en) 1985-09-12
JPS61501355A (en) 1986-07-03
ATE56476T1 (en) 1990-09-15
EP0156545B1 (en) 1990-09-12

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