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WO1996030155A1 - Dispositif de soudage - Google Patents

Dispositif de soudage Download PDF

Info

Publication number
WO1996030155A1
WO1996030155A1 PCT/SE1996/000413 SE9600413W WO9630155A1 WO 1996030155 A1 WO1996030155 A1 WO 1996030155A1 SE 9600413 W SE9600413 W SE 9600413W WO 9630155 A1 WO9630155 A1 WO 9630155A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding device
welding
objects
electrodes
inverter
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.)
Ceased
Application number
PCT/SE1996/000413
Other languages
English (en)
Inventor
Torbjörn STÅHL
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1996030155A1 publication Critical patent/WO1996030155A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B23K11/258—Monitoring devices using digital means the measured parameter being a voltage

Definitions

  • the present invention relates to a welding device in accordance with the preamble of appended claim 1.
  • the invention is particularly suitable for welding for the purpose of joining roofing panels.
  • Conventional welding devices for roofing panels are often of the resistance welding type and comprise a welding head which in turn comprises welding electrodes.
  • the welding head is guided along the bent edge portions formed by two adjacent roofing panels.
  • the welding head is normally connected to a separate transformer which supplies current to the welding head.
  • the known welding devices are characterized in that they require a very high current, in the range of 3000-4000 A, which in turn demands a relatively large transformer and very thick electrical cables between the transformer and the welding head. This implies that the handling of the welding head will be very heavy and cumbersome, which constitutes a problem in connection with the known welding devices .
  • Fig. 1 is a block diagram showing a device according to the present invention
  • Fig. 2 is a simplified front view of a welding head according to the invention.
  • Fig. 3 is a side view of the welding head according to Fig. 2.
  • Fig. 1 shows a block diagram of the electrical components forming part of the welding device according to the present invention.
  • the device comprises a rectifier 1 which is supplied with an alternating voltage, preferably a 380 V three-phase voltage.
  • the rectified voltage is supplied to a dc-ac inverter 2, which converts the rectified voltage to an ac voltage under the control of a frequency control unit 3.
  • the frequency control unit 3 is preferably a voltage- controlled oscillator which is adapted to control the frequency of the inverter 2 so that the voltage is given a frequency of between 500 and 1000 Hz.
  • the frequency control unit 3 can be operated manually by means of an operating device 4.
  • the output voltage from the inverter 2 is supplied to a transformer 5 which transforms the voltage to a lower value.
  • two welding electrodes 6, 7 are arranged at the output of the transformer 5.
  • the transformer 5 supplies a current of approximately 3000-4000 A and a voltage of approximately 2 V to the electrodes 6, 7.
  • the frequency of the frequency control unit 3 and that of the inverter 2 can suitably be set by an operator by means of the operating device 4. Due to the control of the frequency of the inverter 2, the current supplied by the transformer 5 to the electrodes 6, 7 is also controlled. This makes it possible to adapt the welding operation for example according to the thickness of the material to be welded. Variations of the current will appear as a result of leak inductances in the magnetic circuit.
  • the transformer 5 and the two electrodes 6, 7 form a welding head 8. Since the welding head 8 has a small number of components, a light-weight apparatus which can be handled easily is obtained, and the above-mentioned drawbacks regarding the heavy and cumbersome cables can be avoided.
  • Figs. 2 and 3 show a welding head 8 during operation, i.e. during welding of two panels 9, 10.
  • Each one of the panels 9, 10 comprises a section 11, 12 which is bent upwards.
  • the panels 9, 10 are normally in the form of stainless steel in those cases where the welding device is used in order to weld together roofing panels.
  • the welding head 8 is designed with a recess in the form of a longitudinal groove 13 which serves for guiding the welding head 8 in relation to the upwardly bent sections
  • the two welding electrodes 6, 7 are generally cylindrically shaped and are manufactured from a suitable metal alloy.
  • the welding electrodes 6, 7 protrude a certain distance from the welding head itself 8 and are arranged so that they press against the upwards bent sections 11, 12 of the roofing panels 9, 10. This is carried out by means of a spring mechanism (not shown).
  • the device is also provided with a control mechanism adapted to adjust the pressure which the electrodes 6, 7 exert on the upwardly bent sections 11, 12.
  • the transformer 5 is arranged inside or on the welding head 8.
  • the rectifier 1, the inverter 2 and the frequency control unit 3 can be arranged elsewhere.
  • the above- mentioned inverted voltage from the inverter 2 is supplied via an electrical cable 14 (only shown in Fig. 3) to the transformer 5 in the welding head 8.
  • the device also comprises a handle 15, by means of which the welding head 8 can be guided manually by an operator. Consequently, the guiding of the welding head 8 can be carried out in essentially the same way as a lawnmower or a similar machine.
  • the welding head is guided along the the upwardly bent sections 11, 12, thereby forming a continuous welding seam.
  • the handle 15 is provided with a switch (not shown) for switching the welding operation on and off.
  • the handle 15 can also be provided with the above- mentioned operating device 4 for controlling the frequency of the frequency control unit 3 (see also Fig. 1).
  • cooling water or some other suitable cooling medium can be supplied to these components via a cooling pipe 16 (shown only in Fig. 3).
  • an engine can be arranged inside the welding head 8 in order to propel it in a forwards direction during operation thereof.
  • Such an engine can be adapted to propel at least one driving wheel contacting any of the upwardly bent sections 11, 12.
  • the handle 15 can be provided with a further switch by means of which the engine can be operated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Arc Welding Control (AREA)

Abstract

La présente invention concerne un dispositif de soudage destiné à assembler au moins deux objets (9, 10). Il comprend au moins deux électrodes (6, 7) à appliquer sur les objects en question (11, 12) et un transformateur (5) servant à alimenter les électrodes (6, 7) en courant. L'invention est caractérisée en ce qu'elle comprend un redresseur (1) qui est branché à un onduleur (2), ce dernier étant raccordé au transformateur (5), ainsi qu'un dispositif (3) de commande de la fréquence, qui sert à régler la fréquence de l'onduleur (2). L'invention apporte une amélioration au dispositif de soudage pour les produits en forme de tôles, en particulier les tôles de toiture.
PCT/SE1996/000413 1995-03-29 1996-03-29 Dispositif de soudage Ceased WO1996030155A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501175-5 1995-03-29
SE9501175A SE515818C2 (sv) 1995-03-29 1995-03-29 Strömtillförsel vid svetsanordning för sammanfogning av takplåtar

Publications (1)

Publication Number Publication Date
WO1996030155A1 true WO1996030155A1 (fr) 1996-10-03

Family

ID=20397775

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000413 Ceased WO1996030155A1 (fr) 1995-03-29 1996-03-29 Dispositif de soudage

Country Status (2)

Country Link
SE (1) SE515818C2 (fr)
WO (1) WO1996030155A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326591B1 (en) 1998-02-17 2001-12-04 Illinois Tool Works Inc. Method and apparatus for short arc welding

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4910375A (en) * 1986-09-18 1990-03-20 Kabushiki Kasha Toshiba Inverter-type resistance welding machine
US4973815A (en) * 1989-11-02 1990-11-27 Kabushiki Kaisha Nagoya Dengensha Resistance welder using an inverter
EP0502478A2 (fr) * 1991-03-06 1992-09-09 Elpatronic Ag Procédé pour le soudage électrique par résistance spécialement avec courant de soudage alternatif non sinusoidal et arrangement pour la mise en oeuvre du procédé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4910375A (en) * 1986-09-18 1990-03-20 Kabushiki Kasha Toshiba Inverter-type resistance welding machine
US4973815A (en) * 1989-11-02 1990-11-27 Kabushiki Kaisha Nagoya Dengensha Resistance welder using an inverter
EP0502478A2 (fr) * 1991-03-06 1992-09-09 Elpatronic Ag Procédé pour le soudage électrique par résistance spécialement avec courant de soudage alternatif non sinusoidal et arrangement pour la mise en oeuvre du procédé

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326591B1 (en) 1998-02-17 2001-12-04 Illinois Tool Works Inc. Method and apparatus for short arc welding
US6653595B2 (en) 1998-02-17 2003-11-25 Illinois Tool Works Inc. Method and apparatus for welding with output stabilizer
US6800832B2 (en) 1998-02-17 2004-10-05 Illinois Tool Works Inc. Method and apparatus for welding
US6987243B2 (en) 1998-02-17 2006-01-17 Illinois Tool Works Inc. Method and apparatus for welding
US7598474B2 (en) 1998-02-17 2009-10-06 Illinois Tool Works Inc. Method and apparatus for short arc welding

Also Published As

Publication number Publication date
SE9501175L (sv) 1996-09-30
SE515818C2 (sv) 2001-10-15
SE9501175D0 (sv) 1995-03-29

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