WO2006114248A1 - Method and device for resistance spot welding - Google Patents

Method and device for resistance spot welding Download PDF

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Publication number
WO2006114248A1
WO2006114248A1 PCT/EP2006/003723 EP2006003723W WO2006114248A1 WO 2006114248 A1 WO2006114248 A1 WO 2006114248A1 EP 2006003723 W EP2006003723 W EP 2006003723W WO 2006114248 A1 WO2006114248 A1 WO 2006114248A1
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WO
WIPO (PCT)
Prior art keywords
welding
current
power
performance
resistance spot
Prior art date
Application number
PCT/EP2006/003723
Other languages
German (de)
French (fr)
Inventor
Gerhard Lechler
Original Assignee
PROMESS Gesellschaft für Montage- und Prüfsysteme mbH
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 PROMESS Gesellschaft für Montage- und Prüfsysteme mbH filed Critical PROMESS Gesellschaft für Montage- und Prüfsysteme mbH
Publication of WO2006114248A1 publication Critical patent/WO2006114248A1/en

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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

Definitions

  • the invention relates to a method for resistance spot welding in which a product-specific time sequence of a welding process is specified by means of a control device.
  • the invention has for its object to develop a welding process that offers high process reliability without much effort.
  • This object is achieved in a surprisingly simple manner according to the invention that the specification of the timing of the welding process in the form of a power-time diagram is carried out and that the actual welding power by a power and Voltage measurement is continuously compared with the welding nominal power and adjusted by changing the current to the latter.
  • the method according to the invention has the advantage that it can largely eliminate negative influences on the welding result as a result of irregular resistance profiles with the aid of an easily achievable power control.
  • the invention also provides a device which is suitable for carrying out the method and the structure of which is explained below with reference to the attached block diagram.
  • 1 is a welding current generator whose outputs are connected via lines 2 and 3 to the welding electrodes 4 and 5.
  • a control device 6 is used, to which two measured values, namely the actual value of the welding current I , are continuously supplied by the welding current generator 1 and the actual value of the welding voltage U is delivered.
  • the two usually analog measured values are digitized in a multiplier 7 and multiplied together.
  • the result of the multiplication is the instantaneous electrical welding power Pis t delivered to the welding electrodes 4, 5.
  • the value of the welding actual power P determined is is tor a Kompera- supplied 8, the welding actual power P with a desired value P as the welding power n compares, which comes from a store 9, in the time diagram deposited a Performance that has been created through experiments that have been carried out under optimal conditions and have produced satisfactory results.
  • the deviation of the actually supplied actual welding power from the required welding target power can then be determined in a computing module 10, which causes the welding power generator 1 to adjust the welding actual power to the welding target power by changing the welding current. It is understood that all power control modules must respond to changes very quickly, ie in fractions of a millisecond, in order to reconcile the power changes with the process changes. A microprocessor control comes into consideration for power control.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Generation Of Surge Voltage And Current (AREA)

Abstract

The invention relates to a method and a device for resistance spot welding. The aim of the invention is to increase process reliability, i.e. especially to obtain regular weld joints. The inventive method is characterized by setting the temporal progression of the welding process in the form of a performance/time diagram and continuously comparing the welding performance with the desired welding performance by current and voltage measurements and adapting the actual performance to the desired performance by modifying the current.

Description

Verfahren und Vorrichtung zum WiderstandspunktschweißenMethod and apparatus for resistance spot welding
Technisches GebietTechnical area
Die Erfindung betrifft ein Verfahren zum Widerstandpunktschweißen, bei dem mit Hilfe eines Regelgerätes ein produktspezifischer zeitlicher Ablauf eines Schweiß- Vorganges vorgegeben wird.The invention relates to a method for resistance spot welding in which a product-specific time sequence of a welding process is specified by means of a control device.
Stand der TechnikState of the art
Bekannt und allgemein üblich ist ein Verfahren der vorstehenden Art, bei dem die Vorgabe in Form eines Strom-Zeit-Diagrammes erfolgt. Mit diesem Verfahren würden in der Praxis befriedigende Ergebnisse erzielt, wenn die Widerstände in der Schweißzone sich bei jedem Schweißvorgang zumindest in ähnlicher Weise verändern würden. Dies ist indes regelmäßig nicht der Fall, d.h. die Prozesssicherheit des Schweißvorganges lässt zu wünschen übrig. Um die Prozessunsicherheit abzufangen, behilft man sich in der Praxis damit, dass man zum Verbinden der jeweiligen Bauteile mehr Schweißpunkte vorsieht, als dies aus Gründen der Verbin- dungsfestigkeit an sich erforderlich ist. Andererseits hat es nicht an Bemühungen gefehlt, die Prozesssicherheit von Punktschweißverfahren durch das Erfassung einer Vielzahl sich mehr oder weniger verändernder mechanischer und elektrischer Parameter zu erhöhen. So wird beispielsweise in der DE 37 11 771 A1 vorgeschlagen, den Prozessverlauf durch mehrere Stellgrößen in Form des Stromfließwinkels, der Elektrodenkraft und der Schweißzeit zu regeln. Der mit der Erfassung und Verarbeitung mehrerer Stellgrößen erforderliche Aufwand ist allerdings vergleichsweise groß.Known and common practice is a method of the above type, in which the specification takes place in the form of a current-time diagram. With this method, satisfactory results would be achieved in practice if the resistances in the weld zone changed at least in a similar manner with each welding operation. However, this is not regularly the case, i. the process reliability of the welding process leaves something to be desired. In order to counteract the process insecurity, in practice it is made use of the fact that more welding points are provided for connecting the respective components than is necessary for reasons of connection strength per se. On the other hand, there has been no lack of efforts to increase the process reliability of spot welding processes by detecting a variety of more or less changing mechanical and electrical parameters. For example, it is proposed in DE 37 11 771 A1 to regulate the course of the process by means of a plurality of manipulated variables in the form of the current flow angle, the electrode force and the welding time. However, the effort required to acquire and process a plurality of manipulated variables is comparatively high.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, ein Schweißverfahren zu entwickeln, das ohne großen Aufwand eine hohe Prozesssicherheit bietet. Diese Aufgabe wird auf überraschend einfache Art und Weise erfindungsgemäß dadurch gelöst, dass die Vorgabe des zeitlichen Ablaufes des Schweißvorganges in Form eines Leistungs- Zeit-Diagrammes erfolgt und dass die Schweiß-Istleistung durch eine Strom- und Spannungsmessung laufend mit der Schweiß-Sollleistung verglichen und durch eine Veränderung des Stromes an letztere angepasst wird.The invention has for its object to develop a welding process that offers high process reliability without much effort. This object is achieved in a surprisingly simple manner according to the invention that the specification of the timing of the welding process in the form of a power-time diagram is carried out and that the actual welding power by a power and Voltage measurement is continuously compared with the welding nominal power and adjusted by changing the current to the latter.
Das erfindungsgemäße Verfahren bietet den Vorteil, dass sich bei ihm mit Hilfe einer einfach realisierbaren Leistungsregelung negative Einflüsse auf das Schweiß- ergebnis infolge unregelmäßiger Widerstandsverläufe weitgehend eliminieren lassen.The method according to the invention has the advantage that it can largely eliminate negative influences on the welding result as a result of irregular resistance profiles with the aid of an easily achievable power control.
Gegenstand der Erfindung ist auch eine Vorrichtung, die sich zur Durchführung des Verfahrens eignet und deren Aufbau anhand des beigefügten Blockschaubildes nachstehend erläutert wird.The invention also provides a device which is suitable for carrying out the method and the structure of which is explained below with reference to the attached block diagram.
Wege zur Ausführung der ErfindungWays to carry out the invention
In der einzigen Figur ist 1 ein Schweißstromgenerator, dessen Ausgänge über Leitungen 2 und 3 mit den Schweißelektroden 4 und 5 verbunden sind. Zur Steuerung des auch als Inverter bezeichneten Schweißstromgenerators 1 dient ein Regelgerät 6, an das vom Schweißstromgenerator 1 laufend zwei Messwerte, nämlich der Ist- wert des Schweißstromes list und der Istwert der Schweißspannung Uist geliefert werden. Die beiden üblicherweise analogen Messwerte werden in einem Multiplikator 7 digitalisiert und miteinander multipliziert. Das Ergebnis der Multiplikation ist die augenblickliche an die Schweißelektroden 4, 5 abgegebene elektrische Schweiß- Istleistung Pist. Der ermittelte Wert der Schweiß-Istleistung Pist wird einem Kompera- tor 8 zugeführt, der die Schweiß-Istleistung Pist mit einem Sollwert Pson der Schweißleistung vergleicht, welcher aus einem Speicher 9 stammt, in dem ein Leistungs- Zeit-Diagramm hinterlegt ist, das im Rahmen von Versuchen erstellt wurde, die unter optimalen Bedingungen erfolgten und zu einwandfreien Ergebnissen geführt haben.In the single figure, 1 is a welding current generator whose outputs are connected via lines 2 and 3 to the welding electrodes 4 and 5. For controlling the welding current generator 1, which is also referred to as an inverter, a control device 6 is used, to which two measured values, namely the actual value of the welding current I , are continuously supplied by the welding current generator 1 and the actual value of the welding voltage U is delivered. The two usually analog measured values are digitized in a multiplier 7 and multiplied together. The result of the multiplication is the instantaneous electrical welding power Pis t delivered to the welding electrodes 4, 5. The value of the welding actual power P determined is is tor a Kompera- supplied 8, the welding actual power P with a desired value P as the welding power n compares, which comes from a store 9, in the time diagram deposited a Performance that has been created through experiments that have been carried out under optimal conditions and have produced satisfactory results.
Die Abweichung der tatsächlich zugeführten Schweiß-Istleistung von der geforderten Schweiß-Sollleistung lässt sich anschließend in einem Rechenmodul 10 ermitteln, der den Schweißstromgenerator 1 veranlasst, durch Veränderungen des Schweißstromes die Schweiß-Istleistung an die Schweiß-Sollleistung anzupassen. Es versteht sich, dass alle Bausteine der Leistungssteuerung sehr schnell, d. h. in Bruchteilen einer Millisekunde auf Veränderungen reagieren müssen, um die Leistungsveränderungen mit den Prozessveränderungen in Einklang zu bringen. Auch eine Mikroprozessorsteuerung kommt zur Leistungsregelung in Betracht. The deviation of the actually supplied actual welding power from the required welding target power can then be determined in a computing module 10, which causes the welding power generator 1 to adjust the welding actual power to the welding target power by changing the welding current. It is understood that all power control modules must respond to changes very quickly, ie in fractions of a millisecond, in order to reconcile the power changes with the process changes. A microprocessor control comes into consideration for power control.

Claims

Ansprüche claims
1. Verfahren zum Widerstandpunktschweißen, bei dem mit Hilfe eines Regelgerätes ein produktspezifischer zeitlicher Ablauf eines Schweißvorganges vorgegeben wird, dadurch gekennzeichnet, dass die Vorgabe des zeitlichen Ablaufes des Schweißvorganges in Form eines Leistungs-Zeit-Diagrammes erfolgt und dass die Schweiß-Istleistung durch eine Strom- und Spannungsmessung laufend mit der Schweiß-Sollleistung verglichen und durch eine Veränderung des Stromes an letztere angepasst wird.1. A method for resistance spot welding, in which by means of a control device, a product-specific timing of a welding process is specified, characterized in that the specification of the timing of the welding process takes place in the form of a power-time diagram and that the actual welding power by a current - And voltage measurement continuously compared with the welding nominal power and adjusted by a change in the current to the latter.
2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, dass das Regelgerät (6) einen Multiplikator (7) zur laufenden2. Apparatus for carrying out the method according to claim 1, characterized in that the control device (6) has a multiplier (7) for the current
Multiplikation gemessener Istwerte des Schweißstromes und der Schweißspannung aufweist, dass dem Multiplikator (7) ein mit einem zur Speicherung eines vorgegebenen Leistungs-Zeit-Diagrammes dienender Speicher (9) verbundener Kompera- tor (8) nachgeschaltet ist und dass sich an den Komperator (8) ein Rechenmodul (10) anschließt, durch den zur Anpassung der Istleistung an die Sollleistung der vom Schweißstromgenerator (1) zu liefernde Strom veränderbar ist. Multiplication of measured actual values of the welding current and the welding voltage has the fact that the multiplier (7) is followed by a comparator (8) connected to a memory (9) serving to store a given power-time diagram, and that the comparator (8 ) is followed by a computing module (10), by the current to be supplied to the target power of the welding power generator (1) to be supplied to change the current.
PCT/EP2006/003723 2005-04-26 2006-04-22 Method and device for resistance spot welding WO2006114248A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510019640 DE102005019640A1 (en) 2005-04-26 2005-04-26 Method and apparatus for resistance spot welding
DE102005019640.3 2005-04-26

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WO2006114248A1 true WO2006114248A1 (en) 2006-11-02

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WO (1) WO2006114248A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1073612A (en) * 1965-05-17 1967-06-28 Donald Francis O Brien Power regulator
JPH09323173A (en) * 1996-06-04 1997-12-16 Nippon Avionics Co Ltd Welding electric source device and controlling method thereof
EP0913224A2 (en) * 1997-10-29 1999-05-06 Miyachi Technos Corporation Resistance-welding power supply apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262962C3 (en) * 1972-12-22 1978-08-10 Messer Griesheim Gmbh, 6000 Frankfurt Method and device for determining the total effective resistance during resistance welding with alternating currents
DE3027315A1 (en) * 1980-07-18 1982-02-11 Rossell Electronique S.A., Lausanne Electric welding generator output control - by amplitude or pulse width modulation trough comparing output with setting
DE3710727A1 (en) * 1987-03-31 1988-10-13 Matuschek Ulrich METHOD AND DEVICE FOR CONTROLLING RESISTANCE OR ARC WELDING PROCESSES
DE3711771A1 (en) * 1987-04-08 1988-10-27 Sts Systemtechnik Und Software Method and arrangement for process control in spot welding
DE19814249A1 (en) * 1998-03-31 1999-10-07 Matuschek Mestechnik Gmbh Resistance welding device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1073612A (en) * 1965-05-17 1967-06-28 Donald Francis O Brien Power regulator
JPH09323173A (en) * 1996-06-04 1997-12-16 Nippon Avionics Co Ltd Welding electric source device and controlling method thereof
EP0913224A2 (en) * 1997-10-29 1999-05-06 Miyachi Technos Corporation Resistance-welding power supply apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 04 31 March 1998 (1998-03-31) *

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Publication number Publication date
DE102005019640A1 (en) 2006-11-09

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