FR2251389A1 - Resistance welding steel grids for concrete reinforcement - using short second heating cycle to ensure ductile welds - Google Patents

Resistance welding steel grids for concrete reinforcement - using short second heating cycle to ensure ductile welds

Info

Publication number
FR2251389A1
FR2251389A1 FR7437244A FR7437244A FR2251389A1 FR 2251389 A1 FR2251389 A1 FR 2251389A1 FR 7437244 A FR7437244 A FR 7437244A FR 7437244 A FR7437244 A FR 7437244A FR 2251389 A1 FR2251389 A1 FR 2251389A1
Authority
FR
France
Prior art keywords
welding
heating cycle
resistance welding
short
welding steel
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
FR7437244A
Other languages
French (fr)
Other versions
FR2251389B1 (en
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Publication of FR2251389A1 publication Critical patent/FR2251389A1/en
Application granted granted Critical
Publication of FR2251389B1 publication Critical patent/FR2251389B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • B23K11/008—Manufacturing of metallic grids or mats by spot welding
    • B23K11/0086—Grids or mats used in concrete structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
    • B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
    • 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
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints

Abstract

Metal grids are mfd. from longitudinal and transverse bars, esp. in naturally hard steels. Immediately after resistance welding and while the bars are still under press., a further heating cycle is applied which is sufficient to retard the cooling speed below the critical quenching speed. The extra heat is pref. applied by passing a low current across the weld for a pre-determined time using the welding electrodes, or auxiliary electrodes on the bar with the larger cross-section. The welding and heating phases can be partly superimposed on each other and can be electronically controlled to a pre-arranged programme. The process avoids brittleness or cracks in the region of the weld, due to the presence of a high carbon content of the alloying elements, combined with rapid cooling after welding.
FR7437244A 1973-11-15 1974-11-12 Resistance welding steel grids for concrete reinforcement - using short second heating cycle to ensure ductile welds Granted FR2251389A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU68814A LU68814A1 (en) 1973-11-15 1973-11-15

Publications (2)

Publication Number Publication Date
FR2251389A1 true FR2251389A1 (en) 1975-06-13
FR2251389B1 FR2251389B1 (en) 1976-10-22

Family

ID=19727507

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7437244A Granted FR2251389A1 (en) 1973-11-15 1974-11-12 Resistance welding steel grids for concrete reinforcement - using short second heating cycle to ensure ductile welds

Country Status (7)

Country Link
BE (1) BE822080A (en)
DE (1) DE2452992A1 (en)
DK (1) DK592174A (en)
FR (1) FR2251389A1 (en)
LU (1) LU68814A1 (en)
NL (1) NL7414410A (en)
SE (1) SE7414138L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527951A1 (en) * 1982-05-27 1983-12-09 Neturen Co Ltd METHOD AND APPARATUS FOR FORMING REINFORCED CONCRETE PITCH PILES
EP0113813A2 (en) * 1982-12-21 1984-07-25 Kurt Held Metallic endless pressing band with a structural surface

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302951A1 (en) * 1987-08-10 1989-02-15 John Donald Collier Process for making wire mesh screens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527951A1 (en) * 1982-05-27 1983-12-09 Neturen Co Ltd METHOD AND APPARATUS FOR FORMING REINFORCED CONCRETE PITCH PILES
EP0113813A2 (en) * 1982-12-21 1984-07-25 Kurt Held Metallic endless pressing band with a structural surface
EP0113813A3 (en) * 1982-12-21 1985-09-11 Kurt Held Metallic endless pressing band with a structural surface

Also Published As

Publication number Publication date
BE822080A (en) 1975-03-03
DE2452992A1 (en) 1975-05-28
DK592174A (en) 1975-07-14
LU68814A1 (en) 1975-03-06
FR2251389B1 (en) 1976-10-22
NL7414410A (en) 1975-05-20
SE7414138L (en) 1975-05-16

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Legal Events

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CD Change of name or company name
ST Notification of lapse