US2945161A - Circuit arrangement for the control of welding voltage - Google Patents

Circuit arrangement for the control of welding voltage Download PDF

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Publication number
US2945161A
US2945161A US733877A US73387758A US2945161A US 2945161 A US2945161 A US 2945161A US 733877 A US733877 A US 733877A US 73387758 A US73387758 A US 73387758A US 2945161 A US2945161 A US 2945161A
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US
United States
Prior art keywords
tube
resistor
anode
circuit arrangement
capacitor
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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
US733877A
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English (en)
Inventor
Jacobs Henri Joseph Anto Marie
Weijdeven Leonardus Fransis De
Roosendaal Lambertus Wilhelmus
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US2945161A publication Critical patent/US2945161A/en
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    • 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
    • B23K11/248—Electric supplies using discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
    • 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

Definitions

  • the present invention relates to a circuit arrangement for producing square-wave control-voltages. More particularly, the invention relates to an arrangement for controlling resistance welding apparatus (for example, with the aid of two controllable, gas or vapor-filled, inversely parallel-connected discharge tubes).
  • the discharge tubes are included in a trigger circuit, so that when one tube ignites, the other tube extinguishes and conversely.
  • the ignition pulses are constantly supplied to one tube and are operative at the other tube only for a desired period.
  • the square-wave control-voltages are derived from at least one of the anode-cathode circuits of these tubes; impedances being included in said anodecathode circuits. 7
  • the time during which each of the two tubes is ignited is determined by the discharge time of two charged capacitors, which serve as a negative voltage source for the control-circuits of the tubes.
  • Each capacitor is connected to the anode of one of the tubes and, via the ignition pulse source, to the control-electrode of the other tube.
  • a materially simpler arrangement is obtained in accordance with the invention by connecting the junction of each of the capacitors with the said source via a resistor to the negative terminal of the supply voltage source of the trigger circuit.
  • the synchronous switching-on may be obtained by supplying the ignition pulses, which are operative only for a desired period of time, via a switch, which is constituted by a high-vacuum diode.
  • the anode of the diode is connected to the control-electrode of the said other tube and the cathode is connected via a resistor to the said negative terminal.
  • the cathode is also connected to the cathode of a controllable, gas or vapor filled, directvoltage-fed auxiliary discharge tube.
  • the auxiliary discharge tube is included, with another auxiliary tube, in
  • a second trigger circuit The use of a high-vacuum tube has the advantage that it passes current at the comparatively low voltages of the ignition pulses.
  • FIG. 1 two controllable, gas or vapor filled 2,945,161 Patented July 12., 1950 discharge tubes 1 and 2 are included in known manner in a trigger circuit.
  • a capacitor 3 is provided between the anodes which are connected to the positive terminal of the direct-voltage source 6 via resistors 4 and 5.
  • a common cathode-resistor is designated by 7.
  • Each of the anodes is connected via acapacitor 8 and 9, respectively, and via the secondary windings 10 and 11 on a common core 12 of a saturated transformer to produce the ignition pulses, to the grid of the other tube.
  • the primary winding of the transformer is omitted for the sake of simplicity.
  • the capacitors 8 and 9 are connected, moreover, via the variable resistors 13 and 14 to the negative terminal of the source 6.
  • a switch 15 which may be'replaced by a controllable discharge tube.
  • the switch 15 If the switch 15 is closed, the ignition pulses are inoperative at the winding 11 and the tube 2 isextinguished, whereas the tube 1 is conductive due to the ignition pulses across the winding 10.
  • the capacitor 8 is charged rapidly to the full value of the direct-voltage source 6 via the resistor 5,'the winding 10, the grid-cathode of the tube 1 and the resistor 7, the lower coating of the capacitor, connected'to the grid, being negative.
  • a voltage is operative at the output terminals 16 and 17 which is equal to the voltagedrop across the anode resistor 4, indicated in Fig. 3 by the line 18. This voltage may serve, for example, as
  • the capacitor 8 will discharge via the comparatively high resistor 13, the resistor 7 and the ignited tube 2, at a comparatively slow ratein accordance with the line 22 of Fig. 2 during a period of time 23, which varies with the adjusted value of the resistor 13. At the end of this period of time the tube 1 ignites again, since the ignition pulse 20 (shown as the last pulse) intersects the ignition characteristic 21. v
  • the period of time is designated by 24, during which the tube 1 is ignited and the tube 2 is extinguished, so that the welding time is equal to the period of time 23 and the intermittent time equal to 24.
  • the welding time and the intermittent time may be adjusted by means of the resistors 13 and 14. If desired, a control-voltage may be derived from the resistor5, the period of time of this voltage being equal to 23.
  • the switch 15 may be replaced (see Fig. 4) by the series-connection of a highf vacuum diode 25 and a resistor 26.
  • the cathode of the tube 25 is connected to means for controlling the conductive condition of said tube, such as the cathode of a controllable, gas or vapor filled, direct-voltage-fed auxiliary discharge tube 27.
  • the tube 27 is shown diagrammatically and designated by 28. If the tube 27 is not conductive, the ignition pulses at the winding 11 will be conducted away via the diode 25, so that the tube 2 is extinguished. If the tube 27 becomes conductive, the voltage :drop across the resistor ,261'becomes 'so large and hence the cathode of the. tube 25 positive-to such an extent-that the-diode 25 is extinguished and tube 2 is ignited.
  • the last-mentioned trigger circuit is, in many cases, advantageous with respect to further controhmanipulations, for example, the electrode pressure prior to and after a welding -cycle,the preheatin-gand postheating-time and so on.
  • a circuit arrangement comprisingfirst and second gas dischargetubes each having an anode, a cathode and a control grid, said cathodes being connected together, means for supplying a direct voltage having a positive polarity terminal and a negative polarity terminal, a first resistor connecting the anode of said first tube to said positive terminal, a second resistor connecting the anode of said second tube to said positive terminal, a third resistor connecting the common cathode connec tion to said negative terminal, means for deriving an output voltage across said first resistor, first ignition pulse supplying means, a first capacitor connected in series circuit'arrangement with said first pulse means between the control electrode of said first tube and the anode of said second tube, said first pulse source being interposed between said first capacitor and said control grid, at first variable resistor connected between a point in said series circuit arrangement interposed between said firstcapacitor arid said first pulse means and said negative terminal, second ignition pulsesupplying means, a second capacitor connected in series circuit arrangement with said second pulse means
  • Aycircuit arrangement comprising first and second gas'dischargetubes each having an anode, a'cathode and a control grid, said cathodes being connected together,
  • first resistor connectingthe'anode of said first tube to said a second resistor .connecting the third resistor connectingthe common cathode connec- 'tionto said negative terminal, means for-deriving an "output voltage across said first resistor, first ignition pulse supplying means, a first capacitor connected in series circuit arrangement with said first pulse means between the control electrode of said first tube and the anode of said second tube, said first pulse source being interposed between saidfirst capacitor and said control grid, a first variable resistor connected between a point in said series "circuit arrangement interposed between said first capacitor and said first pulse means andsaid negative terminal, second ignition pulse supplying means, a second.
  • a circuit arrangement comprising first and second discharge tubes each having an anode, a Cathode and a control grid, said cathodes being connected together, means for supplying a direct voltage having a positive polarity terminaland. a negative polarity terminal, a first resistor connecting the anode of said first tube to said positive terminal, a second resistor connecting the anode of said second tube to said positive terminal, a third resistor connecting the common cathode connection to said negative terminal, means for deriving an output voltage across said first resistor, first ignition pulse supplying means, a first capacitor connected in series circuit arrangement with said first pulse means between the control electrode of said first tube and the anode of said second tube, said first pulse source being interposed between said first capacitor and said control grid, at first variable resistor connected between a point in said series circuit arrangement interposed between said first capacitor and said first pulse means and said negative terminal, second ignition pulse supplying means, a second capacitor connected in series circuit arrangement with said second pulse means between the control electrode of said :second tube and the an
  • a circuit arrangement comprising first and second gas discharge tubes each having an anode, a cathode and a control grid, said cathodes beingconnected together, means for supplying a direct voltage having arpositive polarity terminal and a negative polarity terminal, a first resistor connecting the anode of said first tube to said positive terminal, a second resistor connecting the anode of said second tube to said positive terminal, a third resistor connecting the common cathode connection to said negative terminal, means for deriving an output voltage across said first resistor, first ignition pulse supplying means, a first capacitor connected in series circuit arrangement with said first pulse means between the con- .trol electrode of said first tube and the anode of said tube and the anode of said first tube, said second pulse source being interposed between said second capacitor and said control grid, a second variable resistor connected between a point in said last-mentioned series circuit arrangement interposed between said second capacitor and said second pulse means and said negative terminal, means for interrupting the supply of ignition pulses to said second tube where

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Generation Of Surge Voltage And Current (AREA)
US733877A 1957-06-03 1958-05-08 Circuit arrangement for the control of welding voltage Expired - Lifetime US2945161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL217795 1957-06-03

Publications (1)

Publication Number Publication Date
US2945161A true US2945161A (en) 1960-07-12

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US733877A Expired - Lifetime US2945161A (en) 1957-06-03 1958-05-08 Circuit arrangement for the control of welding voltage

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US (1) US2945161A (en, 2012)
BE (1) BE568243A (en, 2012)
CH (1) CH363678A (en, 2012)
FR (1) FR1203062A (en, 2012)
GB (1) GB825600A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295329B (de) * 1963-10-15 1969-05-14 Kurz Heinrich Zeitschalter fuer Widerstandsschweissmaschinen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464528A (en) * 1946-06-20 1949-03-15 Rava Alexander Apparatus for welding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464528A (en) * 1946-06-20 1949-03-15 Rava Alexander Apparatus for welding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295329B (de) * 1963-10-15 1969-05-14 Kurz Heinrich Zeitschalter fuer Widerstandsschweissmaschinen

Also Published As

Publication number Publication date
CH363678A (de) 1962-08-15
GB825600A (en) 1959-12-16
FR1203062A (fr) 1960-01-15
BE568243A (en, 2012)

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