GB1321838A - Resistance welding control - Google Patents

Resistance welding control

Info

Publication number
GB1321838A
GB1321838A GB1321838DA GB1321838A GB 1321838 A GB1321838 A GB 1321838A GB 1321838D A GB1321838D A GB 1321838DA GB 1321838 A GB1321838 A GB 1321838A
Authority
GB
United Kingdom
Prior art keywords
weld
resistance
time
rate
change
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
Inventor
D J Pasquire
P E Burton
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.)
Pressed Steel Fisher Ltd
Original Assignee
Pressed Steel Fisher Ltd
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 Pressed Steel Fisher Ltd filed Critical Pressed Steel Fisher Ltd
Publication of GB1321838A publication Critical patent/GB1321838A/en
Expired 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
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/25—Monitoring devices
    • B23K11/252—Monitoring devices using digital means
    • B23K11/256—Monitoring devices using digital means the measured parameter being the inter-electrode electrical resistance
    • 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
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/241—Electric supplies
    • B23K11/246—Electric supplies for flash welding

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)
  • Relay Circuits (AREA)

Abstract

1321838 Resistance welding PRESSED STEEL FISHER Ltd 15 July 1970 [16 July 1969 12 Nov 1969] 35817/69 and 55347/69 Heading H2H A method of resistance welding comprises monitoring the rate of change of weld resistance or a function thereof and allowing welding current to flow for an additional time after the rate of change of weld resistance has reached a predetermined value, the additional time being calculated as a function of the time for the rate of change of weld resistance to reach the predetermined value. A weld cycle is initiated by actuating a controller 21 so that electrodes 12 are moved into contact with a workpiece, the controller also closing a weld current switch 20 and starting a timer 17. Generators 13 and 14 provide signals proportional to the voltage across the workpiece and the weld current respectively, these signals being fed to a resistance signal generator 15 which is connected to a slope detector 16 for detecting when the rate of change of the weld resistance has reached the predetermined value e.g. when the resistance has a maximum value. The time Tp at this instance is registered by a timer 17 which passes a signal to a calculator 18 to enable the calculator to compute a time Tt = Tp.A + B where A and B are constants, A lying in the range 0À2 to 3À5 and B lying in the range -100 to + 100 milliseconds. The calculator 18 preselects the value of B in accordance with the gauge, condition and material of the workpiece. When the time Tt has expired a controller 19 opens the switch 20 to terminate the weld.
GB1321838D 1969-07-16 1969-07-16 Resistance welding control Expired GB1321838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3581769 1969-07-16

Publications (1)

Publication Number Publication Date
GB1321838A true GB1321838A (en) 1973-07-04

Family

ID=10381851

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1321838D Expired GB1321838A (en) 1969-07-16 1969-07-16 Resistance welding control

Country Status (2)

Country Link
JP (1) JPS5310013B1 (en)
GB (1) GB1321838A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329561A (en) * 1975-12-11 1982-05-11 Friedrich Eichhorn Method of ensuring the maintenance of constant quality of spot welds

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5840524U (en) * 1981-09-12 1983-03-17 富士重工業株式会社 exhaust turbine supercharger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329561A (en) * 1975-12-11 1982-05-11 Friedrich Eichhorn Method of ensuring the maintenance of constant quality of spot welds

Also Published As

Publication number Publication date
JPS5310013B1 (en) 1978-04-11

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee