WO2002034456A1 - Method and device for closing the gap in welding - Google Patents

Method and device for closing the gap in welding Download PDF

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Publication number
WO2002034456A1
WO2002034456A1 PCT/CH2001/000622 CH0100622W WO0234456A1 WO 2002034456 A1 WO2002034456 A1 WO 2002034456A1 CH 0100622 W CH0100622 W CH 0100622W WO 0234456 A1 WO0234456 A1 WO 0234456A1
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Prior art keywords
gap
powder
welding
magnetic field
closing
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PCT/CH2001/000622
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German (de)
French (fr)
Inventor
Eugen Freuler
Original Assignee
Elpatronic Ag
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.)
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Publication date
Application filed by Elpatronic Ag filed Critical Elpatronic Ag
Priority to DE10194646T priority Critical patent/DE10194646D2/en
Priority to JP2002537487A priority patent/JP2005500907A/en
Priority to AU2001291595A priority patent/AU2001291595A1/en
Publication of WO2002034456A1 publication Critical patent/WO2002034456A1/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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/18—Working by laser beam, e.g. welding, cutting or boring using absorbing layers on the workpiece, e.g. for marking or protecting purposes
    • 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
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0026—Auxiliary equipment
    • 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
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0046—Welding
    • B23K15/0053—Seam welding
    • B23K15/0073—Seam welding with interposition of particular material to facilitate connecting the parts, e.g. using a filler

Definitions

  • the invention relates to a method for
  • Lasers is a common connection method today. Instead of the laser, an energy beam such as an electron beam can be used.
  • the sheets are preferably butt-joined to one another by positioning the end faces of the sheets to be connected such that there is only a narrow gap between the sheets.
  • the gap between the sheets to be joined should not be wider than 0.05 or 0.08 mm, so that the deviations of a single sheet may not exceed half of the maximum permissible gap widths. It is obvious that correspondingly expensive tools or elaborate machining processes are necessary to maintain such tolerances.
  • Another object of the invention is to provide a device for gap closure during welding. This object is achieved with the characterizing features of claim 11. In the following, embodiments of the
  • the figure shows schematically the laser welding (or welding with the aid of an energy beam of any kind) of a sheet metal composite composed of two individual sheets 1, 2, which are welded together on the end face.
  • a sheet metal composite is referred to as tailored blank and is usually subjected to a shaping after welding to form a molded part.
  • the sheets 1, 2 are usually iron or iron-containing sheets, but aluminum sheets can also be welded to a tailored blank [1].
  • the gap 3 must not be too large in order to ensure a perfect quality of the weld 6, since the welding zone 11 of the laser beam 5 has only a limited diameter.
  • the small gap width required therefore requires, according to the prior art, a very precise and therefore complex preparation of the opposite edges of the sheets 1 and 2.
  • a filling powder 9 is now introduced into the gap 3, whereby the The gap is at least partially closed, which allows the gap width of the gap 3 existing before the filling to be selected to be larger or the processing accuracy of the edges and thus the processing effort to be reduced.
  • the filling powder is further stabilized by a magnetic field 15 in the gap.
  • the actual welding zone below the laser beam 5 is designated by 11 and the cooling bath is cooled by 7.
  • the direction of advance of the workpiece consisting of the sheets 1, 2 takes place according to the arrow Vj ⁇ .
  • the magnetic field 15 in the gap 3 is generated by a schematically illustrated electromagnet 12 which has a coil 14 which is wound around a U-shaped yoke 13.
  • the current flowing in the coil 14 causes a magnetic flux a or a magnetic flux density B in the gap 3.
  • the powder 9 is introduced into the gap by a feed device 8 and held in the gap by the magnetic field 15 or its position in the gap is stabilized ,
  • the powder which can be influenced by the magnetic field which is generally an iron powder or an iron-containing powder, is adjusted in accordance with the field lines of the magnetic field. Due to the stabilizing effect of the magnetic field 15, it is possible not only to introduce a powder directly into the welding zone 11, as is shown in the case of welding tailored blanks made of aluminum in [1], but the powder can also be in any desired position the actual welding zone penetration area 10 are introduced into the gap 3, provided that the magnetic field acts in this area.
  • the iron powder also serves as an alloy additive to influence the hardness formation of the weld seam 6.
  • the magnetic field line concentration in the gap 3 inevitably pulls the iron powder into the gap where it is larger than the grain size of the iron powder.
  • essentially spherical powder particles are used in order to effect better embedding in the gap 3 flooded in the magnetic field.
  • the powder can be introduced only in the welding zone 11 or in the welding zone 11 and the zone 10 of the gap 3 in front of it or only in the zone 10 of the gap 3 in front of the welding zone. Temperatures in the welding zone 11 are above of the Curie point so that the magnetic field does not influence the flow behavior of the liquid metal.
  • the magnetic field can also have a positive influence on the welding behavior.
  • the vector of the magnetic flux density B is to be chosen such that it is rotated at right angles to the feed direction V M , viewed clockwise. In the example shown, it is U-shaped
  • Electromagnet used can, for example, the magnet -.. Be ordered to ⁇ 13 coil on a side leg of the yoke, the magnetic circuit closes on the abutment edge of the to be welded sheets 1, 2.
  • Field can be generated in a stationary manner over time or also with a variation that varies over time, which can also be different along the gap section to be filled.
  • the filling can be improved by a fluctuating magnetic field, and subsequently the powder filled in the gap can be stabilized by a stationary magnetic field.
  • the feed of the powder 9 through the feed device 8 can e.g. through a fluid flow, in particular an inert gas. It is also possible to convey the powder by means of piezo impulses or magnetic impulses.
  • the tracking of the feed device according to the gap course and / or the filling control after filling can be e.g. by optical gap tracking means that are known before.
  • the device 12 for generating the magnetic field in the gap 3 can also be combined with fundamentally known magnetic clamping means for holding the sheets in the welding machine.
  • the electromagnet can be divided in the longitudinal direction of the gap into several separately fed individual magnets.
  • the welding or the device can be used for the laser welding of sheets that abut in a straight line (linear tailored blanks), but in particular for the welding of sheets that do not lie in a straight line (so-called non-linear tailored blanks) where other methods of gap closing cannot be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Laser Beam Processing (AREA)

Abstract

According to the inventive process for closing the gap (3) between the parts (1, 2) in advance during a welding operation, a powder (9) is introduced into the gap and kept there by a magnetic field (15).

Description

Verfahren und Einrichtung zur Spaltschliessung beim. Schweissen Process and device for gap closure at. Welding
Die Erfindung betrifft ein Verfahren zumThe invention relates to a method for
Schliessen des Spaltes zwischen zu verschweissenden Teilen, ein gemäss dem Verfahren hergestelltes tailored blank, eine Einrichtung zum Schliessen des Spaltes sowie eine Schweissvorrichtung mit einer solchen Einrichtung. Das Verschweissen von Blechen mit Hilfe einesClosing the gap between parts to be welded, a tailored blank produced according to the method, a device for closing the gap and a welding device with such a device. The welding of sheets with the help of a
Lasers ist ein heute verbreitetes Verbindungsverfahren. Anstelle des Lasers kann auch ein Energiestrahl wie z.B. ein Elektronenstrahl eingesetzt werden. Dabei werden die Bleche vorzugsweise stumpf miteinander verbunden, indem die Stirnflächen der zu verbindenden Bleche derart positioniert werden, dass nur ein enger Spalt zwischen den Blechen besteht. Um eine hohe Qualität der Schweissnaht zu erreichen, sollte der Spalt zwischen den zu verbindenden Blechen nicht breiter als 0,05 bzw. 0,08 mm sein, wo- mit die Abweichungen eines einzelnen Bleches die Hälfte dieser maximal zulässigen Spaltbreiten nicht überschreiten dürfen. Es liegt auf der Hand, dass zur Einhaltung solcher Toleranzen entsprechend kostspielige Werkzeuge oder aber aufwendige Bearbeitungsverfahren notwendig sind.Lasers is a common connection method today. Instead of the laser, an energy beam such as an electron beam can be used. The sheets are preferably butt-joined to one another by positioning the end faces of the sheets to be connected such that there is only a narrow gap between the sheets. In order to achieve a high quality of the weld seam, the gap between the sheets to be joined should not be wider than 0.05 or 0.08 mm, so that the deviations of a single sheet may not exceed half of the maximum permissible gap widths. It is obvious that correspondingly expensive tools or elaborate machining processes are necessary to maintain such tolerances.
Beim Laserschweissen von tailored blanks aus Aluminiumblechen ist vorgeschlagen worden in die Schweisszone hinein ein Füllerpulver einzubringen: [1] T. Pohl, "Laser welded aluminum tailored blanks - recent re- sults from applied research" . Aus [2] Schweissen & Schneiden, 52 (2000) Heft 3, S. 140-148, M. Kern et al . , "Beeinflussung der Schweissnahtqualität beim CC>2-Laser- strahlschweissen durch magnetofluiddynamische Effekte", ist es bekannt, die Schweissgualität durch ein Magnetfeld in der Schweisszone zu verbessern. Der vorliegenden Erfindung liegt die Aufgabe zugrunde die Spaltschliessung und damit auch die Schweissqualität zu verbessern.When laser welding tailored blanks from aluminum sheets, it has been proposed to introduce a filler powder into the welding zone: [1] T. Pohl, "Laser welded aluminum tailored blanks - recent results from applied research". From [2] Schweissen & Schneid, 52 (2000) Heft 3, S. 140-148, M. Kern et al. "Influencing the weld seam quality in CC> 2 laser beam welding by means of magnetofluid dynamic effects", it is known to improve the welding quality by means of a magnetic field in the welding zone. The object of the present invention is to improve the gap closure and thus also the welding quality.
Dies wird beim eingangs genannten Verfahren mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst . Dadurch, dass ein Magnetfeld im Spalt in Kombination mit einem Füllerpulver verwendet wird, kann eine sehr gute Spaltschliessung und Schweissqualität erzielt werden; das Füllerpulver wird dabei durch das Magnetfeld im Spalt stabilisiert.This is achieved in the method mentioned at the outset with the characterizing features of claim 1. The fact that a magnetic field in the gap is used in combination with a filler powder enables a very good gap closure and welding quality to be achieved; the filler powder is stabilized by the magnetic field in the gap.
Der Erfindung liegt ferner die Aufgabe zugrunde eine Einrichtung zur Spaltschliessung beim Schweissen zu schaffen. Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Anspruchs 11 gelöst . Im folgenden werden Ausführungsbeispiele derAnother object of the invention is to provide a device for gap closure during welding. This object is achieved with the characterizing features of claim 11. In the following, embodiments of the
Erfindung anhand der Zeichnung näher erläutert. Dabei zeigt die einzige Figur schematisch das Schweissen eines tailored blanks .Invention explained with reference to the drawing. The only figure shows schematically the welding of a tailored blank.
Die Figur zeigt schematisch das Laserschweis- sen (bzw. das Schweissen mit Hilfe eines Energiestrahls beliebiger Art) eines Blechverbundes aus zwei einzelnen Blechen 1, 2, welche stirnseitig aneinandergeschweisst werden. Ein solcher Blechverbund wird als tailored blank bezeichnet und wird in der Regel nach der Schweissung ei- ner Umformung zur Bildung eines Formteiles unterzogen. Die Bleche 1, 2 sind dabei in der Regel Eisen- oder eisenhaltige Bleche, es können indes auch Aluminiumbleche zu einem tailored blank verschweisst werden [1] . Wie bereits erwähnt, darf der Spalt 3 nicht zu gross sein, um eine einwandfreie Qualität der Schweissnaht 6 sicherzustellen, da die Schweisszone 11 des Laserstrahls 5 nur einen begrenzten Durchmesser aufweist . Die geringe geforderte Spaltbreite bedingt daher nach Stand der Technik eine sehr genaue und damit aufwendige Vorbereitung der gegenüberliegenden Kanten der Bleche 1 und 2.The figure shows schematically the laser welding (or welding with the aid of an energy beam of any kind) of a sheet metal composite composed of two individual sheets 1, 2, which are welded together on the end face. Such a sheet metal composite is referred to as tailored blank and is usually subjected to a shaping after welding to form a molded part. The sheets 1, 2 are usually iron or iron-containing sheets, but aluminum sheets can also be welded to a tailored blank [1]. As already mentioned, the gap 3 must not be too large in order to ensure a perfect quality of the weld 6, since the welding zone 11 of the laser beam 5 has only a limited diameter. The small gap width required therefore requires, according to the prior art, a very precise and therefore complex preparation of the opposite edges of the sheets 1 and 2.
Gemäss der vorliegenden Erfindung wird nun ein Füllpulver 9 in den Spalt 3 eingebracht, wodurch der Spalt mindestens teilweise geschlossen wird, was es erlaubt, die vor der Füllung bestehende Spaltbreite des Spaltes 3 grösser zu wählen bzw. die Bearbeitungsgenauigkeit der Kanten und damit den Bearbeitungsaufwand zu sen- ken . Gemäss der Erfindung wird ferner das Füllpulver durch ein Magnetfeld 15 im Spalt stabilisiert. In der Figur ist die eigentliche Schweisszone unterhalb des Laserstrahls 5 mit 11 und das sich abkühlende Schweissbad mit 7 bezeichnet. Geht man von einem feststehenden Laser 5 aus, so erfolgt die Vorschubrichtung des aus den Blechen 1, 2 bestehenden Werkstückes gemäss dem Pfeil Vj^. Das Magnetfeld 15 im Spalt 3 wird durch einen schematisch dargestellten Elektromagneten 12 erzeugt, der eine Spule 14 aufweist, die um ein U~förmiges Joch 13 gewickelt ist. Der in der Spule 14 fliessende Strom bewirkt einen magnetischen Fluss ä bzw. eine magnetische Flussdichte B im Spalt 3. Das Pulver 9 wird durch eine Zuführvorrichtung 8 in den Spalt eingebracht und durch das Magnetfeld 15 im Spalt gehalten bzw. in seiner Lage im Spalt stabilisiert. Das vom Magnetfeld beeinflussbare Pulver-, das in der Regel ein Eisenpulver oder ein Eisen enthaltendes Pulver ist, wird sich dabei gemäss den Feldlinien des magnetischen Feldes einstellen. Durch die stabilisierende Wirkung des Magnetfeldes 15 ist es möglich, ein Pulver nicht nur direkt in die Schweisszone 11 einzuführen, wie dies im Falle der Schweissung von tailored blanks aus Aluminium in [1] gezeigt ist, sondern das Pulver kann auch in einem beliebig weit vor der eigentlichen Schweisszone liegenden Eindringbereich 10 in den Spalt 3 eingebracht werden, vorausgesetzt in diesem Bereich wirkt das Magnetfeld. Auf diese Weise ist eine Pulvereinbringung nicht nur in die turbulente Schweisszone 11 möglich, sondern bereits vorbereitend entlang des Spaltes in eine noch nicht von der Schweissung beeinflussten Zone 10, was die geordnete Einbringung in gewünschter Menge des Pulvers 9 in den Spalt und damit die möglichst gute Spaltschliessung ermöglicht. Weiter ist es so möglich, geeignete De- tektoren an einem Ort vor der Schweisstelle einzusetzen, welche die richtige Füllung überwachen. Die Einbringung eines solchen, im Magnetfeld sich stabilisierenden Pulvers ist natürlich sowohl bei der Schweissung von tailo- red blanks aus Eisen- und Stahlblechen als auch bei der Schweissung von tailored blanks aus Aluminiumblechen oder anderen Materialien möglich.According to the present invention, a filling powder 9 is now introduced into the gap 3, whereby the The gap is at least partially closed, which allows the gap width of the gap 3 existing before the filling to be selected to be larger or the processing accuracy of the edges and thus the processing effort to be reduced. According to the invention, the filling powder is further stabilized by a magnetic field 15 in the gap. In the figure, the actual welding zone below the laser beam 5 is designated by 11 and the cooling bath is cooled by 7. Assuming a fixed laser 5, the direction of advance of the workpiece consisting of the sheets 1, 2 takes place according to the arrow Vj ^. The magnetic field 15 in the gap 3 is generated by a schematically illustrated electromagnet 12 which has a coil 14 which is wound around a U-shaped yoke 13. The current flowing in the coil 14 causes a magnetic flux a or a magnetic flux density B in the gap 3. The powder 9 is introduced into the gap by a feed device 8 and held in the gap by the magnetic field 15 or its position in the gap is stabilized , The powder which can be influenced by the magnetic field, which is generally an iron powder or an iron-containing powder, is adjusted in accordance with the field lines of the magnetic field. Due to the stabilizing effect of the magnetic field 15, it is possible not only to introduce a powder directly into the welding zone 11, as is shown in the case of welding tailored blanks made of aluminum in [1], but the powder can also be in any desired position the actual welding zone penetration area 10 are introduced into the gap 3, provided that the magnetic field acts in this area. In this way, it is not only possible to introduce powder into the turbulent welding zone 11, but also preparatively along the gap into a zone 10 which has not yet been influenced by the welding, which means the orderly introduction of the desired amount of powder 9 into the gap and thus the best possible Gap closure enables. It is also possible to use suitable de- tectors in a place in front of the welding point, which monitor the correct filling. The introduction of such a powder, which stabilizes in the magnetic field, is of course possible both when welding tailor-made blanks made of iron and steel sheets and when welding tailored blanks made of aluminum sheets or other materials.
Das Eisenpulver dient dabei auch als Legierungszusatz zur Beeinflussung der Härtebildung der Schweissnaht 6. Die magnetische Feldlinienkonzentration im Spalt 3 zieht das Eisenpulver zwangsläufig in den Spalt, dort wo dieser grösser ist als die Korngrösse des Eisenpulvers. Diese ist entsprechend fein zu wählen, um eine gute Füllung des Spaltes zu ermöglichen.- Bevorzug- terweise werden im wesentlichen kugelförmige Pulverteilchen verwendet, um eine bessere Einbettung im Magnetfeld durchfluteten Spalt 3 zu bewirken. Die Pulvereinbringung kann dabei, falls gewünscht, nur in der Schweisszone 11 erfolgen oder in der Schweisszone 11 und der vor dieser liegenden Zone 10 des Spaltes 3 oder nur in der vor der Schweisszone liegenden Zone 10 des Spaltes 3. In der Schweisszone 11 liegen Temperaturen oberhalb des Curie - Punktes vor, so dass das Magnetfeld das Fliessverhalten des flüssigen Metalls nicht beeinflusst. Es ist aber aus [2] bekannt, dass das Magnetfeld zusätzlich das Schweiss- verhalten positiv beeinflussen kann. Entsprechend ist der Vektor der magnetischen Flussdichte B so zu wählen, dass er im Uhrzeigersinn gesehen rechtwinklig zur Vorschubrichtung VM gedreht ist . Im gezeigten Beispiel wird ein U-förmigerThe iron powder also serves as an alloy additive to influence the hardness formation of the weld seam 6. The magnetic field line concentration in the gap 3 inevitably pulls the iron powder into the gap where it is larger than the grain size of the iron powder. This should be chosen to be correspondingly fine in order to enable the gap to be filled well. Preferably, essentially spherical powder particles are used in order to effect better embedding in the gap 3 flooded in the magnetic field. If desired, the powder can be introduced only in the welding zone 11 or in the welding zone 11 and the zone 10 of the gap 3 in front of it or only in the zone 10 of the gap 3 in front of the welding zone. Temperatures in the welding zone 11 are above of the Curie point so that the magnetic field does not influence the flow behavior of the liquid metal. However, it is known from [2] that the magnetic field can also have a positive influence on the welding behavior. Correspondingly, the vector of the magnetic flux density B is to be chosen such that it is rotated at right angles to the feed direction V M , viewed clockwise. In the example shown, it is U-shaped
Elektromagnet eingesetzt. Andere Konstruktionsaz"ten sind natürlich ohne weiteres möglich. Es kann z.B. die Magnet - spule auch auf einem seitlichen Schenkel des Jochs 13 an¬ geordnet sein. Der Magnetkreis schliesst sich über die Stosskante der zu schweissenden Bleche 1, 2. Damit ziehen sich die Bleche auch mit grosser Kraft gegenseitig an, was ebenfalls zur Spaltschliessung beiträgt. Das Magnet- feld kann zeitlich stationär erzeugt werden oder auch mit einem zeitlich schwankenden Verlauf, was auch entlang des zu füllenden Spaltabschnittes verschieden sein kann. So kann beim Eindringen des Pulvers in den Spalt die Füllung durch ein schwankendes Magnetfeld verbessert werden, und nachfolgend kann das in den Spalt gefüllte Pulver durch ein stationäres Magnetfeld stabilisiert werden.Electromagnet used. "Ten other Konstruktionsaz are of course readily possible, it can, for example, the magnet -.. Be ordered to ¬ 13 coil on a side leg of the yoke, the magnetic circuit closes on the abutment edge of the to be welded sheets 1, 2. To pull the sheets also with great force against each other, which also contributes to the gap closure. Field can be generated in a stationary manner over time or also with a variation that varies over time, which can also be different along the gap section to be filled. Thus, when the powder penetrates into the gap, the filling can be improved by a fluctuating magnetic field, and subsequently the powder filled in the gap can be stabilized by a stationary magnetic field.
Die Zuführung des Pulvers 9 durch die Zuführeinrichtung 8 kann z.B. durch einen Fluidstrom, insbeson- dere ein Inertgas erfolgen. Es ist auch möglich, das Pulver durch Piezoimpulse oder Magnetimpulse zu fördern. Die Nachführung der Zuführeinrichtung gemäss dem Spaltverlauf und/oder die Füllkontrolle nach der Füllung kann dabei z.B. durch optische Spaltverfolgungsmittel erfolgen, wel- ehe bekannt sind.The feed of the powder 9 through the feed device 8 can e.g. through a fluid flow, in particular an inert gas. It is also possible to convey the powder by means of piezo impulses or magnetic impulses. The tracking of the feed device according to the gap course and / or the filling control after filling can be e.g. by optical gap tracking means that are known before.
Die Einrichtung 12 zur Erzeugung des Magnetfeldes im Spalt 3 kann auch mit grundsätzlich bekannten magnetischen Spannmitteln zum Festhalten der Bleche in der Schweissmaschine kombiniert werden. Der Elektromagnet kann in Längsrichtung des Spaltes in mehrere, getrennt gespeiste Einzelmagnete unterteilt werden.The device 12 for generating the magnetic field in the gap 3 can also be combined with fundamentally known magnetic clamping means for holding the sheets in the welding machine. The electromagnet can be divided in the longitudinal direction of the gap into several separately fed individual magnets.
Das Verschweissen bzw. die Einrichtung kann beim Laserschweissen von geradlinig aneinanderstossenden Blechen (lineare tailored blanks) insbesondere aber beim Schweissen von nicht geradlinig aneinanderliegenden Blechen (sog. nichtlineare tailored blanks) eingesetzt werden, wo andere Verfahren zur SpaltSchliessung nicht einsetzbar sind. The welding or the device can be used for the laser welding of sheets that abut in a straight line (linear tailored blanks), but in particular for the welding of sheets that do not lie in a straight line (so-called non-linear tailored blanks) where other methods of gap closing cannot be used.

Claims

Patentansprüche claims
1. Verfahren zum Schliessen des Spaltes zwi- sehen mittels Strahlschweissen, insbesondere Laserstrahl- schweissen, zu verschweissenden Teilen, dadurch gekennzeichnet, dass in den Spalt ein Füllpulver eingebracht und dessen Lage durch ein im Spalt angelegtes Magnetfeld stabilisiert wird. 1. Method for closing the gap between parts to be welded by means of beam welding, in particular laser beam welding, characterized in that a filler powder is introduced into the gap and its position is stabilized by a magnetic field applied in the gap.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Füllpulver in der Schweisszone und/oder vor der Schweisszone in den Spalt eingebracht wird.2. The method according to claim 1, characterized in that the filling powder is introduced into the gap in the welding zone and / or in front of the welding zone.
3. Verfahren nach Anspruch 1 oder 2 , dadurch gekennzeichnet, dass ein aus Metall bestehendes oder ein Metall enthaltendes Pulver als Füllpulver eingebracht wird.3. The method according to claim 1 or 2, characterized in that a powder consisting of metal or containing a metal is introduced as a filling powder.
4. Verfahren nach einem der Ansprüche 1 bis4. The method according to any one of claims 1 to
3, dadurch gekennzeichnet, dass ein ferromagnetisches Me- tallpulver, insbesondere Eisenpulver in den Spalt eingebracht wird.3, characterized in that a ferromagnetic metal powder, in particular iron powder, is introduced into the gap.
5. Verfahren nach einem der Ansprüche 1 bis5. The method according to any one of claims 1 to
4, dadurch gekennzeichnet, dass ein Pulver mit einem überwiegenden Anteil im wesentlichen kugelförmiger Pul- verteilchen zugeführt wird.4, characterized in that a powder with a predominant proportion of substantially spherical powder particles is fed.
6. Verfahren nach einem der Ansprüche 1 bis6. The method according to any one of claims 1 to
5, dadurch gekennzeichnet, dass ein während der Pulvereinbringung und/oder Schweissung stationäres oder veränderliches Magnetfeld erzeugt wird. 5, characterized in that a stationary or variable magnetic field is generated during the powder introduction and / or welding.
7. Verfahren nach einem der Ansprüche 1 bis7. The method according to any one of claims 1 to
6, dadurch gekennzeichnet, dass der Magnetfeldvektor B im Spalt im Uhrzeigersinn um 90 Winkelgrad zum Werkstückvorschubvektor Vji gedreht ist .6, characterized in that the magnetic field vector B is rotated clockwise by 90 degrees to the workpiece feed vector Vji.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Pulver mittels eines Gasstromes eingebracht wird. 8. The method according to any one of claims 1 to 7, characterized in that the powder is introduced by means of a gas stream.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Pulverzufuhr mittels einer optischen Spaltüberwachung geführt und/oder kontrolliert wird. 9. The method according to any one of claims 1 to 8, characterized in that the powder supply is guided and / or controlled by means of an optical gap monitoring.
10. Tailored blank hergestellt nach einem10. Tailored blank made according to a
Verfahren gemäss einem der Ansprüche 1 bis 9.Method according to one of claims 1 to 9.
11. Einrichtung zum Schliessen des Spaltes zwischen den zu verschweissenden Teilen vor der Schweisszone einer Schweissvorrichtung, dadurch gekennzeichnet, dass die Einrichtung Mittel zur Erzeugung eines Magnetfeldes im Spalt sowie Zuführmittel für ein Pulver in den Spalt aufweist .11. Device for closing the gap between the parts to be welded in front of the welding zone of a welding device, characterized in that the device has means for generating a magnetic field in the gap and feed means for a powder in the gap.
12. Einrichtung nach Anspruch 11, dadurch gekennzeichnet, dass das Magnetfelderzeugungsmittel mindes- tens einen Elektromagneten umfasst.12. The device according to claim 11, characterized in that the magnetic field generating means comprises at least one electromagnet.
13. Einrichtung nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass das Zuführmittel eine Fluid- quelle sowie ein Mischelement zur Einbringung von Pulver in das Fluid aufweist. 13. Device according to claim 11 or 12, characterized in that the supply means has a fluid source and a mixing element for introducing powder into the fluid.
14. Schweissvorrichtung mit einer Einrichtung nach einem der Ansprüche 11 bis 13.14. Welding device with a device according to one of claims 11 to 13.
15. Schweissvorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass diese als Laserschweissvor- richtung für tailored blanks ausgestaltet ist. 15. Welding device according to claim 14, characterized in that it is designed as a laser welding device for tailored blanks.
PCT/CH2001/000622 2000-10-24 2001-10-18 Method and device for closing the gap in welding WO2002034456A1 (en)

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AU2001291595A AU2001291595A1 (en) 2000-10-24 2001-10-18 Method and device for closing the gap in welding

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CN107020453A (en) * 2017-06-07 2017-08-08 华中科技大学 A kind of excitation mobile platform of laser-arc magnetic field composite welding
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US10626902B2 (en) 2006-04-19 2020-04-21 Arcelormittal France Steel part
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US10480554B2 (en) 2006-04-19 2019-11-19 Arcelormittal France Steel part
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US10828729B2 (en) 2011-07-26 2020-11-10 Arcelormittal Hot-formed previously welded steel part with very high mechanical resistance and production method
US10919117B2 (en) 2011-07-26 2021-02-16 ArcelorMittal Investigación y Desarrollo, S.L. Hot-formed previously welded steel part with very high mechanical resistance and production method
US11426820B2 (en) 2011-07-26 2022-08-30 Arcelormittal Hot-formed previously welded steel part with very high mechanical resistance and production method
DE102012013582A1 (en) * 2012-03-07 2013-09-12 Johnson Controls Gmbh welding processes
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RU2701262C1 (en) * 2019-03-29 2019-09-25 Паршуков Леонид Иванович Method for electron-beam butt welding

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