US3708601A - Electrode joint having undercut electrode sockets - Google Patents

Electrode joint having undercut electrode sockets Download PDF

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Publication number
US3708601A
US3708601A US00164773A US3708601DA US3708601A US 3708601 A US3708601 A US 3708601A US 00164773 A US00164773 A US 00164773A US 3708601D A US3708601D A US 3708601DA US 3708601 A US3708601 A US 3708601A
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United States
Prior art keywords
electrode
nipple
socket
length
threaded
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 - Lifetime
Application number
US00164773A
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English (en)
Inventor
P Kozak
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.)
Graftech Technology LLC
Original Assignee
Union Carbide Corp
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Publication date
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Assigned to MORGAN GUARANTY TRUST COMPANY OF NEW YORK, AND MORGAN BANK ( DELAWARE ) AS COLLATERAL ( AGENTS ) SEE RECORD FOR THE REMAINING ASSIGNEES. reassignment MORGAN GUARANTY TRUST COMPANY OF NEW YORK, AND MORGAN BANK ( DELAWARE ) AS COLLATERAL ( AGENTS ) SEE RECORD FOR THE REMAINING ASSIGNEES. MORTGAGE (SEE DOCUMENT FOR DETAILS). Assignors: STP CORPORATION, A CORP. OF DE.,, UNION CARBIDE AGRICULTURAL PRODUCTS CO., INC., A CORP. OF PA.,, UNION CARBIDE CORPORATION, A CORP.,, UNION CARBIDE EUROPE S.A., A SWISS CORP.
Assigned to UNION CARBIDE CORPORATION, reassignment UNION CARBIDE CORPORATION, RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MORGAN BANK (DELAWARE) AS COLLATERAL AGENT
Assigned to UCAR CARBON TECHNOLOGY CORPORATIONA CORP. OF DE reassignment UCAR CARBON TECHNOLOGY CORPORATIONA CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNION CARBIDE CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/14—Arrangements or methods for connecting successive electrode sections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • ABSTRACT An electrode joint comprising two end-face electrode sections having female threaded sockets designed for mating with a male threaded nipple so that when joined by the nipple, all the threads at the base of the Assignee: Union Carbide Corporation, New
  • This invention relates to ele,ctricfurnace electrode columns composed of two or more electrode sections joined at their end-faces by male threaded nipples wherein the female threads at the base of each electrode section socket are all engaged with threads on the mating nipple.
  • the present invention provides a means whereby the .stress concentration at the unengaged threads at the base of an electrode socket is eliminated by the elimination of suchth'reads, and the stress concentration at the last-engaged threaded area in the base is reduced thereby increasing the strength of the electrode joint.
  • the invention relates to electrode sections and specifically to electrode sections having at least one threaded socket wherein the threads in the base of such socket are undercut sufficiently so that when two electrode sections are joined by threaded nipple means, there will be no unengaged electrode threads in the base of the sockets of the electrode joint.
  • FIG. 1 A conventional type electrode joint (Prior Art).
  • FIG. la An enlarged view of the threaded area in the base of the electrode section in FIG. 1.
  • FIG. 2 An electrode joint employing an undercut electrode socket according to this invention.
  • FIG. 2a An enlarged view'of the threaded area in the base of the electrode section of FIG. 2.
  • FIG. 2B An enlarged view of the threaded area in the electrode section of FIG. 2.
  • FIG. 3 A simulated arrangement of a threaded section of an electrode column.
  • a conventional type electrode joint shown in FIG. 1 comprises an upper electrode section 1 and a lower electrode section 2 joined at their end-faces 3 by male threaded nipple 4.
  • An enlarged view of the threaded area at the base of the socket is shown in FIG. la wherein the last thread 5 on nipple 4 is engaged with thread 6 on electrode section 1.
  • the unengaged or inactive thread or threads 7 at the base of the electrode socket and the last engaged or active thread thereat are usually high stress areas due to the thermal and/or mechanical stress build-up concentrated thereat.
  • the former stress is attributed mainly to the difference in the coefficients of thermal expansion between the threaded nipple 4 andthe electrode section 1 when they are exposed to the high temperature environment of an operating electric furnace.
  • the mechanical stress is due mainly to the mechanical shock andvibrations associated with lowering of a consumable electrode. into an electric furnace.
  • the combination of these stresses are sometimes sufficient to actually fracture the electrode near the base of the socket area either at the last active thread vicinity or at the inactive thread vicinity.
  • the undercut socket joint arrangement of this invention shown in FIG. 2, comprises an upper electrode section 1, and a lower electrode section 2' joined at their end-faces 3 by male threaded nipple 4'.
  • the threaded area at the base of the socket is shown magnified in FIG. 2a wherein thread 5' on nipple 4' is engaged with the last thread 6 on electrode section 1'.
  • the unengaged threads at the base of the electrode socket shown in FIG. 2a are removed thereby increasing notch angle A defined as the angle formed by the loaded flank of the last electrode thread at the base of the socket and the wall of the electrode socket.
  • a simulated threaded plate section 1 using modified acme threads similar to those used in actual electrode joints, was prepared as shown in FIG. 3.
  • the threaded simulated sample measuring 14 inches by 7 inches by one-fourth inch thick was made of graphite commercially available as type AGX graphite.
  • Photoelectric stress analysis utilizes the relationship between the state of stress in a material and the way the material transmits polarized light. Briefly, experimentation consists of observing an optical pattern for fringes which can be related to stress via the wave theory of light and the theory of elasticity. Further discussion on photoelasticity testing can be found in A Treatise on Photoelasticity by E. G. Coker and L. N. Fillon, Cambridge University Press, London, 1931, and Experimental Stress Analysis and Motion Measurement" by R. C. Dove and P. H. Adams, Charles and Morrill Books, lnc., Columbus, 1964.
  • a Model 232 digital readout compensator was used with a Model 031 polariscope (both manufactured by Photolastic, Inc.) so as to assure the accuracy of measurement of the fringe order in the particular stress area of the test sample.
  • the digital readout was capable of measuring fringes to an accuracy of one fifty-third of one fringe and the unit of measurement employed was expressed as a fringe unit.
  • a reading of l fringe was divided into 53' segments so as to correlate with the degree of accuracy of the digital readout so that a 1 fringe unit would equal a reading of 53 over an accuracy of53, i.e., 1 fringe unit 53 reading/53 accuracy.
  • An electrode joint comprising a first electrode section with a female threaded socket at its end-face, a second section with a female threaded socket at its endface, and a male threaded nipple means joining said end-faces of said first and second electrode sections, the improvement which comprises having the base of each electrode socket in said electrode sections undercut at least a minimum length according to the following fonnula:
  • An electrode section having at least one female threaded socket for mating with a threaded nipple, the improvement which comprises the undercutting of its base of the socket at least a minimum length in accordance with the following formula:

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)
US00164773A 1971-07-21 1971-07-21 Electrode joint having undercut electrode sockets Expired - Lifetime US3708601A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16477371A 1971-07-21 1971-07-21

Publications (1)

Publication Number Publication Date
US3708601A true US3708601A (en) 1973-01-02

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ID=22596027

Family Applications (1)

Application Number Title Priority Date Filing Date
US00164773A Expired - Lifetime US3708601A (en) 1971-07-21 1971-07-21 Electrode joint having undercut electrode sockets

Country Status (10)

Country Link
US (1) US3708601A (enrdf_load_stackoverflow)
JP (2) JPS5323541B1 (enrdf_load_stackoverflow)
CA (1) CA947801A (enrdf_load_stackoverflow)
DE (1) DE2234411B2 (enrdf_load_stackoverflow)
ES (2) ES405004A1 (enrdf_load_stackoverflow)
FR (1) FR2146885A5 (enrdf_load_stackoverflow)
GB (1) GB1388746A (enrdf_load_stackoverflow)
IT (1) IT961498B (enrdf_load_stackoverflow)
SE (2) SE390475B (enrdf_load_stackoverflow)
ZA (1) ZA725004B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161619A (en) * 1977-11-11 1979-07-17 Republic Steel Corporation Electrode socket design
US20050094701A1 (en) * 2003-10-31 2005-05-05 John Montminy Threaded connection for carbon and/or graphite electrode columns

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2555688C2 (de) * 1975-12-11 1984-09-06 Sigri Elektrographit Gmbh, 8901 Meitingen Verbindung von Kohlenstoff- und Graphitelektroden
JPS57157861U (enrdf_load_stackoverflow) * 1981-03-31 1982-10-04
JPS59229142A (ja) * 1984-05-18 1984-12-22 松下冷機株式会社 冷房装置
DE3506908A1 (de) * 1985-02-27 1986-08-28 Sigri GmbH, 8901 Meitingen Elektrodenverbindung
JPS62125264A (ja) * 1985-11-26 1987-06-06 株式会社デンソー 冷凍サイクル装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2836806A (en) * 1955-06-02 1958-05-27 Union Carbide Corp Conductive pad for electrode joint

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2836806A (en) * 1955-06-02 1958-05-27 Union Carbide Corp Conductive pad for electrode joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161619A (en) * 1977-11-11 1979-07-17 Republic Steel Corporation Electrode socket design
US20050094701A1 (en) * 2003-10-31 2005-05-05 John Montminy Threaded connection for carbon and/or graphite electrode columns
US6952438B2 (en) * 2003-10-31 2005-10-04 Sgl Carbon Ag Threaded connection for carbon and/or graphite electrode columns

Also Published As

Publication number Publication date
ZA725004B (en) 1973-04-25
DE2234411B2 (de) 1976-05-06
SE7511271L (sv) 1975-10-08
JPS53114543A (en) 1978-10-06
SE390475B (sv) 1976-12-20
FR2146885A5 (enrdf_load_stackoverflow) 1973-03-02
SE400876B (sv) 1978-04-10
DE2234411A1 (de) 1973-02-01
JPS5323541B1 (enrdf_load_stackoverflow) 1978-07-15
IT961498B (it) 1973-12-10
ES434799A1 (es) 1976-12-16
CA947801A (en) 1974-05-21
GB1388746A (en) 1975-03-26
JPS5510960B2 (enrdf_load_stackoverflow) 1980-03-21
ES405004A1 (es) 1976-01-16

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AS Assignment

Owner name: MORGAN GUARANTY TRUST COMPANY OF NEW YORK, AND MOR

Free format text: MORTGAGE;ASSIGNORS:UNION CARBIDE CORPORATION, A CORP.,;STP CORPORATION, A CORP. OF DE.,;UNION CARBIDE AGRICULTURAL PRODUCTS CO., INC., A CORP. OF PA.,;AND OTHERS;REEL/FRAME:004547/0001

Effective date: 19860106

AS Assignment

Owner name: UNION CARBIDE CORPORATION,

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:MORGAN BANK (DELAWARE) AS COLLATERAL AGENT;REEL/FRAME:004665/0131

Effective date: 19860925

AS Assignment

Owner name: UCAR CARBON TECHNOLOGY CORPORATIONA CORP. OF DE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNION CARBIDE CORPORATION;REEL/FRAME:005199/0627

Effective date: 19891220