DE102007036416A1 - Auxiliary joining element made of steel for connecting an aluminum plate with a steel part by resistance welding, comprises a shaft guidable through the aluminum plate and weldable at its free end with the steel-part, and a head - Google Patents

Auxiliary joining element made of steel for connecting an aluminum plate with a steel part by resistance welding, comprises a shaft guidable through the aluminum plate and weldable at its free end with the steel-part, and a head Download PDF

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Publication number
DE102007036416A1
DE102007036416A1 DE102007036416A DE102007036416A DE102007036416A1 DE 102007036416 A1 DE102007036416 A1 DE 102007036416A1 DE 102007036416 A DE102007036416 A DE 102007036416A DE 102007036416 A DE102007036416 A DE 102007036416A DE 102007036416 A1 DE102007036416 A1 DE 102007036416A1
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Germany
Prior art keywords
steel
shaft
aluminum plate
auxiliary joining
aluminum sheet
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Withdrawn
Application number
DE102007036416A
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German (de)
Inventor
Virginio Dipl.-Ing. Buonaccorso (FH)
Herwig Laue
Sven Dipl.-Ing. Dickes
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Mercedes Benz Group AG
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Daimler AG
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Priority to DE102007036416A priority Critical patent/DE102007036416A1/en
Publication of DE102007036416A1 publication Critical patent/DE102007036416A1/en
Withdrawn legal-status Critical Current

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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
    • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
    • B23K11/20—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded of different metals
    • 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
    • B23K11/36—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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • B23K2103/20—Ferrous alloys and aluminium or alloys thereof

Abstract

The auxiliary joining element (4) made of steel for connecting an aluminum plate (2) with a steel part (3) by resistance welding, comprises a shaft (6) guidable through the aluminum plate and weldable at its free end with the steel part, and a head (8) radially outstanding the shaft. The head lies at a side turned away from the steel part at the plate in a mounted state. A welding electrode is applied at the head. The shaft has a point, in which it is penetratable or extrudable through the plate. The point is formed at the free end of the shaft. The shaft is arranged as the point.

Description

Die vorliegende Erfindung betrifft ein Hilfsfügeteil aus Stahl zum Verbinden eines Aluminiumblechs mit einem Stahlteil durch Widerstandsschweißen, mit den Merkmalen des Oberbegriffs des Anspruchs 1.The The present invention relates to an auxiliary joining part made of steel for joining an aluminum sheet to a steel part by resistance welding, with the features of the preamble of claim 1.

Aus der DE 42 37 361 C2 ist ein Hilfsfügeteil dieser Art bekannt. Es umfasst einen Schaft, der durch das Aluminiumblech hindurchführbar ist und an seinem freien Ende mit dem Stahlteil verschweißbar ist, sowie einen den Schaft radial überragenden Kopf, der im montierten Zustand an einer vom Stahlteil abgewandten Seite am Aluminiumblech anliegt und an dem eine Schweißelektrode anlegbar ist. Beim bekannten Hilfsfügeteil ist am Schaft außerdem eine als Schneidkante ausgestaltete Außenkante vorgesehen, die beim Montieren als Stanzwerkzeug zum Stanzen einer Durchführungsöffnung im Aluminiumblechteil verwendet wird. Ferner trägt der Schaft an seinem freien Ende eine Schweißwarze oder einen Schweißbuckel, der beim Durchführen des Schafts durch die Durchführungsöffnung mit dem Stahlteil in Kontakt kommt und das Widerstandsschweißen, bei dem es sich insbesondere um ein Widerstandsbuckelschweißen handelt, ermöglicht. Beim bekannten Hilfsfügeteil entsteht somit bei der Montage Abfall, nämlich das beim Stanzen der Durchführungsöffnung freigeschnittene Aluminiumblechteil. Dieses muss separat entsorgt werden.From the DE 42 37 361 C2 An auxiliary joining part of this kind is known. It comprises a shank which can be passed through the aluminum sheet and can be welded at its free end to the steel part, and a head projecting radially beyond the shank, which abuts the aluminum sheet on a side facing away from the steel part in the mounted state and on which a welding electrode can be placed , In the known Hilfsfügeteil a designed as a cutting edge outer edge is also provided on the shaft, which is used when mounting as a punching tool for punching a passage opening in the aluminum sheet metal part. Further, the shaft carries at its free end a welding lug or a welding hump, which comes into contact with the steel part during the passage of the shaft through the passage opening and the resistance welding, which is in particular a resistance hump welding possible. In the known auxiliary joining part thus arises during assembly waste, namely the cut when punching the lead-through aluminum sheet part. This must be disposed of separately.

Hier setzt die vorliegende Erfindung an. Die Erfindung beschäftigt sich mit dem Problem, für ein Hilfsfügeteil der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere dadurch ausgezeichnet, dass der damit durchführbare Fügeprozess vereinfacht ist.Here uses the present invention. The invention employs with the problem for an auxiliary joining part of the initially mentioned type an improved embodiment particular distinguished by the fact that the thus feasible joining process is simplified.

Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This Problem is inventively by the subject of the independent claim. advantageous Embodiments are the subject of the dependent Claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, das Hilfsfügeteil nach Art eines Nagels zu gestalten, so dass der Schaft durch das Aluminiumblech durchschlagbar oder durchdrückbar ist. Hierzu ist der Schaft mit einer Spitze ausgestattet, die ein Durchdrücken bzw. Durchschlagen des Aluminiumblechs ermöglicht. Beim Durchdrücken bzw. Durchschlagen wird das Material des Aluminiumblechs verdrängt, ohne dass dabei Abfall entsteht. Dementsprechend muss beim Montieren des Hilfsfügeteils kein Abfall entsorgt werden, was den Fügeprozess vereinfacht.The Invention is based on the general idea, the auxiliary joining part to shape in the manner of a nail, so that the shaft through the Aluminum sheet is durchschlagbar or durchdrückbar. This is the shaft is equipped with a tip that pushes through or permeation of the aluminum sheet allows. At the Pressing or strike through the material of the aluminum sheet displaced, without causing waste. Accordingly does not need to dispose of waste when mounting the auxiliary joining part which simplifies the joining process.

Die Spitze zum Durchschlagen bzw. Durchdrücken des Aluminiumblechs kann an einem freien Ende des Schafts ausgebildet sein. Alternativ kann der gesamte Schaft als Spitze ausgestaltet sein. Die unterschiedlichen Varianten können auf unterschiedliche Blechstärken des Aluminiumblechs abgestimmt sein. Bei relativ dünnen Aluminiumblechen kann auf einen zylindrischen Schaftabschnitt verzichtet werden. Bei dickeren Aluminiumblechen kann ein zylindrischer Schaft erforderlich sein, um das Aluminiumblech vollständig durchdringen zu können.The Tip for penetrating or pushing through the aluminum sheet may be formed at a free end of the shaft. alternative the entire shaft can be designed as a tip. The different ones Variants can work on different sheet thicknesses be matched to the aluminum sheet. At relatively thin Aluminum sheets can be dispensed with a cylindrical shaft portion become. For thicker aluminum sheets can be a cylindrical shaft be required to completely penetrate the aluminum sheet to be able to.

Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the invention will become apparent from the Subclaims, from the drawings and from the associated Description of the figures with reference to the drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It it is understood that the above and the following yet to be explained features not only in each case specified combination, but also in other combinations or can be used in isolation, without the scope of the present To leave invention.

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen.preferred Embodiments of the invention are in the drawings and will become more apparent in the following description explained, wherein the same reference numerals to the same or similar or functionally identical components relate.

Es zeigen, jeweils schematisch,It show, in each case schematically,

1 eine stark vereinfachte, prinzipielle Schnittansicht durch eine mit Hilfe eines Hilfsfügeteils hergestellte Verbindung, 1 a greatly simplified, schematic sectional view through a compound produced by means of an auxiliary joining part,

2 bis 4 Seitenansichten des Hilfsfügeteils bei unterschiedlichen Ausführungsformen. 2 to 4 Side views of the auxiliary joining part in different embodiments.

Entsprechend 1 lässt sich eine Verbindung 1 zwischen einem Aluminiumblech 2 und einem Stahlteil 3 mit Hilfe eines Hilfsfügeteils 4 realisieren. Hierzu durchsetzt das Hilfsfügeteil 4 das Aluminiumblech 2 und ist mit dem Stahlteil 3 verschweißt. Eine entsprechende Schweißzone ist in 1 mit 5 bezeichnet. Die Verbindung 1 realisiert somit eine stoffschlüssige Verbindung zwischen dem Hilfsfügeteil 4 und dem Stahlteil 3 durch eine direkte Verschweißung des Hilfsfügteils 4 mit dem Stahlteil 3. Im Unterschied dazu wird das Aluminiumblech 2 durch Formschluss und ggf. durch Kraftschluss über das Hilfsfügeteil 4 am Stahlteil 3 fixiert.Corresponding 1 lets connect 1 between an aluminum sheet 2 and a steel part 3 with the help of an auxiliary joining part 4 realize. For this purpose, the auxiliary joining part passes through 4 the aluminum sheet 2 and is with the steel part 3 welded. A corresponding welding zone is in 1 With 5 designated. The connection 1 thus realizes a material connection between the auxiliary joining part 4 and the steel part 3 by a direct welding of the auxiliary joining part 4 with the steel part 3 , In contrast, the aluminum sheet 2 by positive locking and possibly by adhesion via the auxiliary joining part 4 on the steel part 3 fixed.

Entsprechend den 1 bis 4 umfasst das Hilfsfügeteil 4 zu diesem Zweck einen Schaft 6, der bezüglich einer Längsmittelachse 7 des Hilfsfügteils 4 axial verläuft und der im montierten Zustand gemäß 1 durch das Aluminiumblech 2 hindurchgeführt ist und der an seinem freien Ende, also an dem dem Stahlblech 3 zugewandten Ende mit dem Stahlblech 3 verschweißt ist. Desweiteren weist das Hilfsfügeteil 4 einen Kopf 8 auf, von dem der Schaft 6 ausgeht. Der Kopf 8 überragt den Schaft 6 in radialer Richtung und kann dadurch im montierten Zustand am Aluminiumblech 2 axial zur Anlage kommen, und zwar an einer vom Stahlteil 3 abgewandten Seite 9 des Aluminiumblechs 2. Der Kopf 8 ist so ausgestaltet, dass daran eine Schweißelektrode anlegbar ist.According to the 1 to 4 includes the auxiliary joining part 4 a shaft for this purpose 6 which is relative to a longitudinal central axis 7 of the auxiliary joining part 4 axially and in the assembled state according to 1 through the aluminum sheet 2 passed through and at its free end, that is on the steel sheet 3 facing end with the steel sheet 3 is welded. Furthermore, the auxiliary joining part 4 a head 8th on, from which the shaft 6 emanates. The head 8th dominates the shaft 6 in the radial direction and can thereby in the assembled state on the aluminum sheet 2 come axially to the plant, and at one of the steel part 3 opposite side 9 of the aluminum sheet 2 , The head 8th is designed so that a welding electrode can be applied thereto.

Entsprechend den 2 bis 4 weist der Schaft 6 des erfindungsgemäßen Hilfsfügeteils 4 eine Spitze 10 auf. Die Spitze 10 ist dabei so dimensioniert, insbesondere hinsichtlich eines Spitzenwinkels 11, dass der Schaft 6 durch das Aluminiumblech 2 hindurchdrückbar bzw. hindurchschlagbar ist, ohne dass das Aluminiumblech 2 zuvor mit einer Öffnung versehen werden muss. Beim Durchdrücken bzw. Durchschlagen des Schafts 6 durch das Aluminiumblech 2 entsteht eine in 1 erkennbare Durchgangsöffnung 12 im Aluminiumblech 2, ohne dass dabei Abfall gebildet wird. Die Spitze 10 verdrängt das Material des Aluminiumblechs 2 radial und ermöglicht dadurch die Durchführung des Schafts 6 durch das Aluminiumblech 2.According to the 2 to 4 has the shaft 6 the auxiliary joining part according to the invention 4 a peak 10 on. The summit 10 is dimensioned so, in particular with regard to a point angle 11 that the shaft 6 through the aluminum sheet 2 can be pushed or punched through, without the aluminum sheet 2 previously must be provided with an opening. When pushing through or piercing the shaft 6 through the aluminum sheet 2 arises an in 1 recognizable passage opening 12 in aluminum sheet 2 without waste being formed. The summit 10 displaces the material of the aluminum sheet 2 radially and thereby allows the implementation of the shaft 6 through the aluminum sheet 2 ,

Das beim Erzeugen der Durchgangsöffnung 12 verdrängte Aluminium kann gemäß 1 an einem Rand 13 der Durchgangsöffnung 12 einen axial abstehenden Wulst oder Kragen ausbilden, der sich ringförmig erstreckt. In vorteilhafter Weise kann der Kopf 8 die Ausbildung dieses Wulstes 14 berücksichtigen. Dementsprechend besitzt der Kopf 8 bei den hier gezeigten Ausführungsformen radial außen einen axial in Richtung zum Stahlteil 3 hin abstehenden Ringkragen 15, der ringförmig geschlossen umläuft oder in der Umfangsrichtung durch mehrere umfangsmäßig verteilt angeordnete Segmente gebildet sein kann. Dieser Ringkragen 15 übergreift radial den Wulst 14 und hintergreift diesen in axialer Richtung, so dass der Wulst 14 in dem in 14 gezeigten Montagezustand formschlüssig in einen radial zwischen dem Ringkragen 15 und dem Schaft 6 ausgebildeten Ringraum 16 eingreift. Hierdurch kann die formschlüssige bzw. kraftschlüssige Fixierung des Aluminiumblechs 2 an Stahlteil 3 über das Hilfsfügeteil 4 verbessert werden.This when creating the passage opening 12 displaced aluminum can according to 1 on one edge 13 the passage opening 12 form an axially protruding bead or collar which extends annularly. In an advantageous way, the head 8th the training of this bead 14 consider. Accordingly, the head owns 8th in the embodiments shown here radially outward axially toward the steel part 3 protruding ring collar 15 which rotates in a closed ring shape or may be formed in the circumferential direction by a plurality of circumferentially distributed segments arranged. This ring collar 15 radially overlaps the bead 14 and engages behind it in the axial direction, leaving the bead 14 in the 14 shown assembly state positively in a radially between the annular collar 15 and the shaft 6 trained annulus 16 intervenes. As a result, the positive or non-positive fixing of the aluminum sheet 2 on steel part 3 over the auxiliary joining part 4 be improved.

Am Ringkragen 15 können gemäß den 2 und 4 umfangsmäßig verteilt angeordnete Spitzen 17 bzw. eine ringförmig umlaufende Spitze 17 ausgebildet sein. Die jeweilige Spitze 17 kann beim Anbringen des Hilfsfügeteils 4 zusätzlich in das Material des Aluminiumblechs 2 eindringen, um so den Formschluss zu verbessern.On the ring collar 15 can according to the 2 and 4 circumferentially distributed arranged tips 17 or an annular peripheral tip 17 be educated. The respective tip 17 can when attaching the auxiliary joining part 4 additionally in the material of the aluminum sheet 2 penetrate, so as to improve the positive connection.

Gemäß 2 kann der ganze Schaft 6 als Spitze 10 ausgestaltet sein. Eine derartige Ausführungsform ist dann von Vorteil, wenn ein vergleichsweise spitzer Spitzenwinkel 11 erforderlich ist, um das jeweilige Aluminiumblech 2 durchdringen bzw. durchschlagen zu können. Ferner kann eine derartige Ausführungsform bei vergleichsweise kleinen Blechstärken des Aluminiumblechs 2 vorteilhaft sein.According to 2 can the whole shaft 6 as a tip 10 be designed. Such an embodiment is advantageous when a comparatively acute point angle 11 is required to the respective aluminum sheet 2 penetrate or penetrate. Furthermore, such an embodiment with comparatively small plate thicknesses of the aluminum sheet 2 be beneficial.

Bei den Ausführungsformen der 3 und 4 ist die Spitze 10 an einem axial freien Ende des Schafts 6 ausgebildet. Die Spitze 10 geht somit in einen zylindrischen Abschnitt des Schafts 6 über. Eine derartige Ausführungsform kann bei größeren Blechstärken des Aluminiumblechs 2 hilfreich sein.In the embodiments of the 3 and 4 is the top 10 at an axially free end of the shaft 6 educated. The summit 10 thus goes into a cylindrical portion of the shaft 6 above. Such an embodiment can with larger sheet thicknesses of the aluminum sheet 2 to be helpful.

Die Spitze 10 ist bei den Ausführungsformen der 2 bis 4 kegelförmig ausgestaltet. Bei 2 geht die kegelförmige Spitze 10 unmittelbar in den Kopf 8 über, wodurch sie gleichzeitig den Schaft 6 bildet. Im Unterschied dazu geht die kegelförmige Spitze 10 bei den Ausführungsformen der 3 und 4 in den zylindrischen Schaft 6 über.The summit 10 is in the embodiments of 2 to 4 cone-shaped. at 2 go the conical tip 10 directly in the head 8th over, making them the shaft at the same time 6 forms. In contrast, the conical tip goes 10 in the embodiments of the 3 and 4 in the cylindrical shaft 6 above.

Bei den 2 und 4 ist die Spitze 10 so geformt, dass die Mantellinie der Kegelgeometrie geradlinig verläuft. Im Unterschied dazu verläuft die Mantellinie bei der Ausführungsform gemäß 3 konkav gekrümmt, was für bestimmte Konfigurationen vorteilhaft sein kann.Both 2 and 4 is the top 10 shaped so that the generatrix of the cone geometry is rectilinear. In contrast, the generatrix proceeds in the embodiment according to 3 concavely curved, which may be advantageous for certain configurations.

Das Hilfsfügeteil 4 ist mit Kopf 8, Schaft 6 und Spitze 10 aus einem Stück hergestellt, wodurch es vergleichsweise preiswert realisierbar ist.The auxiliary joining part 4 is with a head 8th , Shank 6 and top 10 made of one piece, which makes it comparatively inexpensive feasible.

Bemerkenswert ist außerdem, dass die Spitze 10 für das Widerstandsschweißen als Schweißwarze oder Schweißbuckel verwendbar ist. Das Widerstandsschweißen, bei dem es sich bevorzugt um ein Widerstandsbuckelschweißen handelt, kann insbesondere auch als Kondensatorentladungsschweißen ausgeführt sein.It is also noteworthy that the top 10 suitable for resistance welding as a welding lug or weld hump. The resistance welding, which is preferably a resistance hump welding, can in particular also be designed as capacitor discharge welding.

Nach dem Widerstandsschweißen ist die Spitze 10, zumindest ihr freies Ende, aufgeschmolzen und mit dem Stahlteil 3 zur Ausbildung der Schweißzone 5 verschmolzen bzw. stoffschlüssig verbunden.After resistance welding is the top 10 , at least her free end, melted and with the steel part 3 for the formation of the welding zone 5 fused or materially connected.

ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • - DE 4237361 C2 [0002] - DE 4237361 C2 [0002]

Claims (3)

Hilfsfügeteil aus Stahl zum Verbinden eines Aluminiumblechs (2) mit einem Stahlteil (3) durch Widerstandsschweißen, – mit einem Schaft (6), der durch das Aluminiumblech (2) hindurchführbar ist und an seinem freien Ende mit dem Stahlteil (3) verschweißbar ist, – mit einem den Schaft (6) radial überragenden Kopf (8), der im montierten Zustand an einer vom Stahlteil (3) abgewandten Seite (9) am Aluminiumblech (2) anliegt und an dem eine Schweißelektrode anlegbar ist, dadurch gekennzeichnet, dass der Schaft (6) eine Spitze (10) aufweist, mit welcher er durch das Aluminiumblech (2) durchschlagbar oder durchdrückbar ist.Auxiliary joining part made of steel for joining an aluminum sheet ( 2 ) with a steel part ( 3 ) by resistance welding, - with a shank ( 6 ) passing through the aluminum sheet ( 2 ) is guided through and at its free end with the steel part ( 3 ) is weldable, - with a the shaft ( 6 ) radially projecting head ( 8th ), which in the mounted state at one of the steel part ( 3 ) facing away ( 9 ) on the aluminum sheet ( 2 ) is applied and on which a welding electrode can be applied, characterized in that the shaft ( 6 ) a peak ( 10 ), with which he through the aluminum sheet ( 2 ) is durchschlagbar or durchdrückbar. Hilfsfügteil nach Anspruch 1, dadurch gekennzeichnet, dass die Spitze (10) am freien Ende des Schafts (6) ausgebildet ist.An auxiliary joining part according to claim 1, characterized in that the tip ( 10 ) at the free end of the shaft ( 6 ) is trained. Hilfsfügeteil nach Anspruch 1, dadurch gekennzeichnet, dass der Schaft (6) als Spitze (10) ausgestaltet ist.Auxiliary joining part according to claim 1, characterized in that the shaft ( 6 ) as a tip ( 10 ) is configured.
DE102007036416A 2007-08-02 2007-08-02 Auxiliary joining element made of steel for connecting an aluminum plate with a steel part by resistance welding, comprises a shaft guidable through the aluminum plate and weldable at its free end with the steel-part, and a head Withdrawn DE102007036416A1 (en)

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DE102007036416A DE102007036416A1 (en) 2007-08-02 2007-08-02 Auxiliary joining element made of steel for connecting an aluminum plate with a steel part by resistance welding, comprises a shaft guidable through the aluminum plate and weldable at its free end with the steel-part, and a head

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DE102007036416A DE102007036416A1 (en) 2007-08-02 2007-08-02 Auxiliary joining element made of steel for connecting an aluminum plate with a steel part by resistance welding, comprises a shaft guidable through the aluminum plate and weldable at its free end with the steel-part, and a head

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