Abstract:
A method of producing a chassis component. The method including the steps of coating an outside of a structural component, coating an outside of a joint cartridge which has been preassembled as a joint, and permanently and securely connecting the structural component to the joint cartridge using a material bonding or joining process.

Description:
[0001]    This application is a National Stage completion of PCT/EP2011/066703 filed Sep. 27, 2011, which claims priority from German patent application serial no. 10 2010 043 040.4 filed Oct. 28, 2010. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The invention relates to a method for producing a chassis component. 
       BACKGROUND OF THE INVENTION 
       [0003]    A chassis component generally has a structural component and one or more joints securely connected thereto. Such a chassis component forms, for example, a two-point link, a three-point link or a flange joint, wherein in general, the joint is integrated into the structural component by means of force fitting, screwing or riveting. It is also possible to integrate the joint into an integral structural component housing. Such a chassis component has the following disadvantages: large construction space needs, costly, large fluctuations in the joint characteristic values, heavy weight, large number of individual parts, corrosion-prone regions (e.g. at the turning edge of the joint), large inventory of semi-finished products and greater logistics expenditure. 
         [0004]    A wheel suspension arm for a motor vehicle, known from the document DE 603 04 709 T2, comprises a body formed from stamped sheet metal, which is connected by means of a ball joint to a wheel carrier and by means of two bearings to the vehicle chassis. The ball joint comprises a lower fitting which is inserted into a housing formed by the body and rests against the side edge of the housing via a side projection, and a cover, which is placed on the lower fitting, and which is securely connected to the surface of the body using laser welding. 
         [0005]    With this wheel suspension arm, tolerances can add up in an unfavorable manner, when the lower fitting and the cover are installed at the body. Furthermore, the body, the lower fitting, and possibly the cover must be cleaned after assembly before a protective coating can be applied to these parts. It is also quite expensive to provide the body and the lower fitting, and possibly the cover, with different coatings. 
       SUMMARY OF THE INVENTION 
       [0006]    Based on this prior art, the problem addressed by the invention is to be able to integrate the joint into the structural component in a simple manner and with greater accuracy in the case of a chassis component of the initially named type. Furthermore, it should be easy to implement different coatings of the joint and structural component. 
         [0007]    With the method for producing a chassis component according to the invention, a structural component, which is precoated on the outside thereof, is securely permanently connected by a material bonding joining process to a joint cartridge which is precoated on the outside thereof and is preassembled to a joint. 
         [0008]    Because the joint cartridge already preassembled to a joint is connected to the structural component, the assembly of individual parts of the joint at the structural component is omitted. As a result, a reduction of tolerances in comparison to the integration of DE 603 04 709 T2, can be attained with the integration of the joint into the structural component. Furthermore, because the joint cartridge is connected to the structural component using a material bonding joining process, the connecting procedure of the joint cartridge and the structural component is also performed with very low tolerances. As a result, higher accuracy can be attained than for example using force fitting, screwing or welding of the joint into, or onto, the structural component. Finally, the joint cartridge and the structural component are already precoated so that a different coating of the joint cartridge and the structural component is easily possibly because the joint cartridge and the structural component can be precoated independently of each other. Additionally, the handling of the components to be connected together is simplified because an installer can touch and handle the joint cartridge and the structural component without hesitation, without having to subsequently clean these components, which would otherwise be necessary before a coating process due to impurities that can be attributed to handling. 
         [0009]    The precoated structural component is permanently securely connected to the precoated joint cartridge particularly by a material bonded connection, which is formed by the material bonding joining process. 
         [0010]    The material bonding joining process preferably is or comprises a thermal method for the material bonded joining of materials, for instance soldering or welding, such that the material bonding joining process can also be designated as a thermal, material bonding joining process. Such a joining process is generally associated with a diffusion process so that a connection produced by this method regularly has higher strength than a purely adhesive connection such as an adhesive bonded connection. The joining process is preferably a low energy joining process or a joining process with low total energy input. Thus, it can be guaranteed that one or more heat-sensitive components disposed in the joint cartridge, such as a bearing shell composed of plastic, are not damaged by the introduction of heat associated with the joining process. The material bonding joining process particularly is or comprises beam welding, preferably laser welding. As a result, the connection of the structural component to the joint cartridge can be particularly low tolerance. 
         [0011]    The joint cartridge is preassembled to the joint. For this purpose, a joint inner part is introduced into the joint cartridge and supported movably therein, before the structural component is connected to the joint cartridge. Thus, the joint can be manufactured with a higher accuracy, independently of the structural component. The joint inner part preferably extends out of the joint cartridge. 
         [0012]    The joint cartridge and the structural component are precoated. For this purpose, the joint cartridge and the structural component are each provided with a coating before the structural component is connected to the joint cartridge. Preferably, these are different coatings. The joint cartridge and the structural component are advantageously coated independently of one another. The joint cartridge and structural component are advantageously precoated using different coating methods. The coatings serve particularly for protecting the joint cartridge and the structural component from environmental influences, for instance from contamination and moisture. The coatings advantageously form protective coatings. The joint cartridge is preferably precoated, that is, provided with the coating thereof before the joint cartridge is preassembled to the joint. 
         [0013]    The structural component is preferably dip coated, particularly precoated using cathodic dip coating. For example, the structural component is precoated with a lacquer, which comprises an organic material, for example. The joint cartridge is preferably precoated using galvanic coating. The joint cartridge is coated, for example, with a zinc-iron coating. 
         [0014]    The precoated structural component and the precoated joint cartridge are preferably pretreated for the material bonding joining process. In particular, the precoated structural component and the joint cartridge that is precoated and preassembled to the joint are pretreated for the material bonding joining process. Before performing the material bonding joining process, the precoating of the joint cartridge, particularly the joint cartridge preassembled to the joint, is preferably removed, at least in regions, so that a decoated region is created at the joint cartridge. The joint cartridge with the decoated region thereof is preferably connected to the structural component using the material bonding joining process. The removal of the precoating of the joint cartridge in certain regions preferably occurs using laser decoating or using another decoating method. 
         [0015]    In particular, the precoating of the structural component is removed, at least in regions, before performing the material bonding joining process so that a decoated region is created on the structural component. The structural component is preferably connected with the decoated region thereof to the joint cartridge using the material bonding joining process. It has been shown that decoating in certain regions of the precoated joint cartridge and the precoated structural component can be implemented with lower expenditure than the material bonding joining of an uncoated joint cartridge to an uncoated structural component. This is because the uncoated components must, in general, be cleaned after joining and must be coated. 
         [0016]    According to a further development of the invention, a joint socket is formed at the precoated structural component into which the joint cartridge, which is precoated and preassembled to a joint, is inserted. A joint socket is formed particularly at the precoated structural component into which the joint cartridge, which is precoated and preassembled to the joint, is inserted before performing the material bonding joining process. Here, the joint cartridge is preferably inserted in an axial direction into the joint socket. The removal of the precoating in certain regions of the structural component occurs preferably during the formation of the joint socket. 
         [0017]    The formation of the joint socket preferably occurs using beam cutting, particularly using laser beam fusion cutting. Because beam cutting can be performed with very low tolerances, the joint socket can be formed and positioned with higher accuracy at the structural component. 
         [0018]    The joint socket is preferably formed having a round, non-round, square, rectangular or polygonal perimeter contour. This perimeter contour is particularly an interior perimeter contour which surrounds the joint cartridge after the insertion thereof into the joint socket. The perimeter contour of the joint is preferably matched to the exterior perimeter contour of the joint cartridge. Thus, the joint cartridge is also preferably formed having a round, non-round, square, rectangular or polygonal perimeter contour. By forming a non-round, polygonal or polygon perimeter contour it is possible to implement a form-locking lock against rotation in addition to the material bonding connection. Additionally, by using a polygonal or polygon perimeter contour, a rotational positioning of the joint cartridge can also be provided with respect to the axial direction. A round perimeter contour, in contrast, has the advantage that the installer can insert the joint cartridge into the joint socket in any rotational position with respect to the axial direction. The connection between the joint cartridge and the structural component formed using the material bonding joining process is preferably strong enough to form a sufficient lock against rotation. 
         [0019]    The joint socket preferably comprises a recess into which the joint cartridge is inserted. According to a further development of the invention, the joint socket comprises or forms a hole, which extends through the structural component, and into which the joint cartridge is inserted. The recess of the joint socket is particularly formed by the hole. The hole preferably extends through the structural component in the axial direction. The through hole can be formed in a simple manner using the previously named beam cutting method, and therefore, can be formed with high accuracy. 
         [0020]    The joint cartridge preferably has a radial shoulder with which the joint cartridge rests against the structural component in the axial direction during insertion into the joint socket. Here, the shoulder lies particularly on an edge of the joint socket. The shoulder preferably has a longer extension in the radial direction than the joint socket or the hole. The placement of the shoulder on the structural component forms a positioning aid during insertion of the joint cartridge in the axial direction into the joint socket. The shoulder is particularly an exterior shoulder. The shoulder is preferably a circumferential shoulder. The joint cartridge at the outer peripheral surface thereof preferably has a circumferential collar on which the shoulder is formed. The term “radial” indicates in particular any direction running perpendicular to the axial direction. 
         [0021]    According to a further development of the invention, the outer peripheral surface of the joint cartridge tapers, at least in regions, in the axial direction. The outer peripheral surface is conically shaped, for example, at least in regions in the axial direction. The tapering or conical shape of the outer peripheral surface of the joint cartridge is preferably used for centering the joint cartridge during insertion thereof into the joint socket. In this way, possible tolerances, for example, in the diameter of the joint socket can be compensated. 
         [0022]    The structural component is preferably securely connected to one or more other joints. According to one embodiment of the invention, the structural component is securely connected to the one or to several other joints before the joint socket is formed in the structural component. The location at which the joint socket is formed in the structural component is preferably determined depending on the position, or positions, of the other joint, or other joints, securely connected to the structural component. The position or each of the positions are preferably formed or characterized by a kinematic point of the respective other joint. Thus, the location at which the joint socket is formed in the structural component is preferably determined depending on the kinematic point(s) of the other joint(s) securely connected to the structural component. As a result, a significant increase in accuracy can be attained compared to conventional chassis components, with which the joint socket is already formed before the connection of the structural component to one or more other joints, because the assembly of each of these other joints is associated with positioning inaccuracies. With respect to kinematics, a significant improvement is thereby possible compared the prior art. The other joint(s) preferably comprise or form rubber bearings or elastomer bearings. 
         [0023]    The joint particularly is or forms a ball joint. The inner part of the joint preferably forms a ball pin, having a joint ball, that with the joint ball thereof is introduced into the joint cartridge, and is mounted movably therein, before the structural component is connected to the joint cartridge. Here, the ball pin with the joint ball thereof is mounted particularly movably and/or pivotably in the joint cartridge. The ball pin extends through a joint cartridge opening out of the joint cartridge. According to a further development of the invention, the ball pin is mounted slideably in a bearing shell, which is introduced into the joint cartridge and is preferably made of plastic. 
         [0024]    The wall of the joint cartridge in the region of the joint cartridge opening is preferably reshaped, particularly bent, in the direction of the ball pin. In this case, the region of the wall to be reshaped is preferably free of the precoating of the joint cartridge, because otherwise the precoating in this region could flake off. According to an alternative, the wall of the joint cartridge in the region of the joint cartridge opening is preshaped, however also in the direction of the ball pin. According to another alternative, the joint cartridge opening can also be covered using a locking ring, which is fastened to the joint cartridge and through which the ball pin extends. However, tighter tolerances can be attained by reshaping the wall of the joint cartridge in the region of the joint cartridge opening than with a locking ring, because no additional component is required. The locking ring, or the preshaped, or reshaped region of the wall preferably covers the joint ball in the axial direction such that the ball pin is secured at the joint cartridge in the axial direction, and particularly cannot be pulled out of the cartridge. The reshaping of the wall of the joint cartridge in the region of the joint cartridge opening, or the fastening of the locking ring to the joint cartridge, preferably occurs before connecting the structural component to the joint cartridge. 
         [0025]    According to one embodiment of the invention, the ball pin is introduced into the joint cartridge through the joint cartridge opening, particularly before the wall of the joint cartridge is reshaped in the region of the joint cartridge opening in the direction toward the ball pin, or before the locking ring is fastened to the joint cartridge. 
         [0026]    According to another embodiment of the invention, the joint cartridge has an assembly opening, through which the ball pin is introduced into the joint cartridge, and which is located opposite the joint cartridge opening. This is particularly the case when the wall of the joint cartridge is preshaped in the region of the joint cartridge opening in the direction toward the ball pin. After introducing the ball pin into the joint cartridge, the assembly opening is preferably closed using a housing cover, particularly before the structural component is connected to the joint cartridge. 
         [0027]    The connection region formed by the material bonding joining process, particularly the welding region formed by the welding, is preferably covered by a bellows seal. This offers the advantage that the connection region or the welding region does not need to be protected from environmental influences using a coating, such that the costs of applying such a coating can be saved. The bellows seal is preferably a bellows seal of the joint, which particularly simultaneously seals the joint cartridge opening. The ball pin preferably extends through the bellows seal, which is attached sealing particularly both at the ball pin as well as the joint cartridge and/or the structural component. The bellows seal is preferably composed of a flexible material. The bellows seal is preferably composed of an elastomer material, particularly rubber. 
         [0028]    The structural component is preferably composed of metal. Furthermore, the joint cartridge is preferably metal. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0029]    The invention is described below using preferred embodiments, with reference to the drawings. In the drawings: 
           [0030]      FIG. 1  a perspective view of a chassis component according to a first embodiment of the invention, 
           [0031]      FIG. 2  a longitudinal section through the chassis component along the section line  2 - 2  seen in  FIG. 1 , 
           [0032]      FIG. 3  an enlarged view of the region labeled with B in  FIG. 2 , 
           [0033]      FIG. 4  a perspective representation of the ball joint according to  FIG. 1 , 
           [0034]      FIG. 5  the ball joint according to  FIG. 4  in a state inserted into a joint socket of the structural component seen in  FIG. 1 , 
           [0035]      FIG. 6  a partial sectional view of the ball joint inserted in the joint socket along the section line  6 - 6  seen in  FIG. 5 , 
           [0036]      FIG. 7  a perspective representation of a chassis component according to a second embodiment of the invention, 
           [0037]      FIG. 8  a top view of the structural component seen in  FIG. 7  before the assembly of the ball joint, 
           [0038]      FIG. 9  a perspective representation of the ball joint according to  FIG. 7 , 
           [0039]      FIG. 10  the ball joint according to  FIG. 9  in a state inserted into a joint socket of the structural component according to  FIG. 7 , 
           [0040]      FIG. 11  a partial sectional representation of the ball joint inserted in the joint socket along the section line  11 - 11  seen in  FIG. 10 , 
           [0041]      FIG. 12  a sectional view of the ball joint along the section line  11 - 11  seen in  FIG. 10  after forming a weld seam, 
           [0042]      FIG. 13  a sectional view of the ball joint along the section line  13 - 13  seen in  FIG. 7 , 
           [0043]      FIG. 14  a partial sectional representation of the ball joint inserted in the joint socket along the section line C-C seen in  FIG. 5 , or along the section line  6 - 6  seen in  FIG. 10 , wherein the ball joint additionally is visible in a state only partially inserted into the joint socket, 
           [0044]      FIG. 15  a sectional view of a modified ball joint in the state only partially inserted in the joint socket, and 
           [0045]      FIG. 16  a sectional view of the ball joint according to  FIG. 15  in an inserted state in the joint socket. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0046]      FIGS. 1 to 6  show different views and sectional views of a chassis component  1  according to a first embodiment of the invention, wherein a ball joint  2  is integrated into a structural component  3 . The structural component  3  is formed as a flange which can be securely connected to another vehicle component and for which purpose the structural component  3  has several through holes  4 . The ball joint  2  comprises a joint cartridge  5 , serving as a joint housing, into which a ball pin  6  is mounted to rotate and pivot. The ball pin  6  extends through a joint cartridge opening  7  (see  FIG. 2 ) out of the joint cartridge  5 , wherein the joint cartridge opening  7  is sealed by means of a bellows seal  8 , through which the ball pin  6  extends. The longitudinal central axis  9  of the ball joint  2  runs in an axial direction  10 , wherein a sectional view of the chassis component  1  is shown in  FIG. 2  along the longitudinal central axis  9 . 
         [0047]    The ball pin  6  comprises a joint ball  11 , which forms an axial end of the ball pin  6  and is mounted slideably in a bearing shell  12 , which is preferably made of plastic. The bearing shell  12  sits together with the joint ball  11  in an interior  13  of the joint cartridge  5 , and is secured in the cartridge locked against rotation about the longitudinal central axis  9 . In addition, the wall  14  of the joint cartridge  5  bounding the interior  13  is reshaped in the region of the joint cartridge opening  7  in the direction toward the ball pin  6 . Thus, the wall  14  covers the bearing shell  12  in the region of the joint cartridge opening  7  and the joint ball  11  in the axial direction  10 , such that the ball pin  6  and the bearing shell  12  are secured in the joint cartridge  5  in the axial direction  10 . The bearing shell  12 , on the side thereof facing away from the joint cartridge opening  7 , rests against the wall  14 . 
         [0048]    The joint cartridge  5  sits in a joint socket  15 , which is formed as a hole extending through the structural component  3  in the axial direction  10 . The joint cartridge  5  comprises a peripheral, radial collar  16 , which defines a radial outer shoulder  17  (see  FIG. 3 ), by means of which the joint cartridge  5  rests against the structural component  3  in the axial direction  10 . Thus, the collar  16  secures the joint cartridge  5  in the axial direction  10  at the structural component  3 . Additionally, the joint cartridge  5  is welded to the structural component  3 , wherein the associated welding seam is labeled with the reference number  18 . The welding seam  18  is preferably formed peripherally. The welding seam can have a 360° peripheral formation, but this is not mandatory. 
         [0049]    The bellows seal  8  surrounding the joint cartridge  5 , lies with an axial end region sealing both the joint cartridge  5  and the structural component  3 , and covering therefore the welding seam  18 . In addition, the bellows seal  8  surrounding the ball pin  6  rests with another axial end sealing at the ball pin  6 . The connection region of the ball joint  2  and the structural component  3  is therefore protected from environmental influences. The structural component  3  rests with the perimeter contour (wall of hole)  19  thereof (see  FIG. 6 ) bounding the joint socket  15 , radially at the joint cartridge  5 , such that radially acting forces can be optimally transferred from the ball joint  2  to the structural component  3  and vice versa. 
         [0050]    The method according to the invention for producing the chassis component  1  is described in the following. First, the structural component  3  and the ball joint  2  are produced independently of each other, which can be seen in the individual representation in  FIG. 4 . Only the bellows seal  8  is not yet applied to the ball joint  2 . Then, the ball joint  2  is inserted, leading with the ball pin  6 , in the axial direction  10  into the joint socket  15 , until the collar  16  rests with the shoulder  17  in the axial direction  10  against the structural component  3 . This state is shown in  FIGS. 5 and 6 , wherein  FIG. 6  shows a partial sectional view through the ball joint  2  in the state according to  FIG. 5  along the central longitudinal axis  9 . During insertion of the ball joint  2  into the joint socket  15  of the structural component  3 , the joint cartridge  5  is preferably centered radially by the curved region of the wall  14 . This centering is shown schematically in  FIG. 14 , which shows a section through the ball joint  2  along the longitudinal central axis  9 . Because the reshaped region of the wall  14  in the region of the joint cartridge opening  7  leads to a region of the outer peripheral surface  20  of the joint cartridge  5  tapering in the axial direction  10 , and the joint cartridge  5  is introduced leading with the region of the wall  14  thereof bounding the joint cartridge opening  7  into the joint socket  15  of the structural component  3 , radial centering of the joint cartridge  5  occurs due to the interplay of the perimeter contour  19  with the outer peripheral surface  20 . In  FIG. 14  the structural component  3  is represented twice. In a first state I, the joint cartridge  5  is positioned with its tapering region of the outer peripheral surface  20  in the joint socket  15 . Due to further insertion of the joint cartridge  5  into the joint socket  15  in the axial direction  10 , interplay occurs between the perimeter contour  19  and the outer peripheral surface  20  until the joint cartridge  5  is centered radially in the joint socket  15 . The joint cartridge  5  is inserted into the joint socket  15  in the axial direction  10  until the shoulder  17  of the collar  16  rests against the structural component  3 . This state is labeled with II. For improving the radial centering, the outer peripheral surface  20  of the joint cartridge  5  can additionally be conically shaped in regions in the axial direction  10 , which is shown in  FIGS. 15 and 16  that show a modified embodiment of the joint cartridge  5 . According to the modified embodiment, the outer peripheral surface  20  comprises a region  21  running conically in axial direction  10 , and during insertion of the joint cartridge  5  into the joint socket  15 , the region is brought into contact with the perimeter contour  19 . As a result, the joint cartridge  5  is secured axially to the structural component  3 , so that according to the modified embodiment, the radial collar  16  having the shoulder  17  can be omitted.  FIG. 15  shows a state in which the joint cartridge  5  is only partially inserted into the joint socket  15 , whereas  FIG. 16  shows a state in which the joint cartridge  5  is completely inserted into the joint socket  15 . 
         [0051]    After the joint cartridge  5  is completely inserted into the joint socket  15  of the structural component  3 , the weld seam  18  is formed using laser beam welding and then the bellows seal  8  is attached to the ball joint  2 . 
         [0052]    Before welding the structural component  3  to the joint cartridge  5 , the structural component  3  and the joint cartridge  5  are each coated on the exterior thereof with a coating  22  or respectively  23 , wherein in one region  24 , the coating  23  is removed again using laser decoating, before the joint cartridge  5  is welded to the structural component  3 . The coating  23  is applied to the exterior of the ball pin  6  before the insertion thereof into the joint cartridge  5 , wherein however one end region  25  of the joint cartridge  5  axially surrounding the joint cartridge opening  7  is not provided with the coating  23 . Because the end region  25  is reshaped after insertion of the bearing shell  12  and the joint ball  11 , a coating in the region  25  could flake off during the reshaping. Furthermore, the coating  22  is applied to the structural component  3  before the joint socket  15  is formed. After applying the coating  22  on the structural component  3 , the joint socket  15  is formed in the structural component  3  using laser beam cutting, whereby the coating  22  is simultaneously removed in an edge region  26  of the structural component  3  surrounding the joint socket  15 . The components  2  and  3 , thusly prepared, can now be inserted into each other as described above, after which the decoated regions  24  and  26  are fixedly connected together using laser beam welding while forming the weld seam  18 . After attaching the bellows seal  8 , the weld seam  18 , the still remaining parts of regions  24  and  26 , and the end region  25  are protected from environmental influences by the bellows seal  8 . 
         [0053]      FIGS. 7 to 13  show a chassis component  1  according to a second embodiment of the invention, wherein features that are similar or identical to those of the first embodiment are labeled using the same reference characters as in the first embodiment.  FIG. 7  shows a perspective representation of the chassis component  1 , which is formed as a three-point link and comprises a structural component  3 . A ball joint  2  and two rubber bearings  27  and  28  are securely connected to the structural component  3 , wherein the bearings  27  and  28  preferably serve for linkage of the chassis component  1  to a vehicle chassis of a motor vehicle. The ball joint  2  preferably serves for linkage of the chassis component  1  to a wheel carrier. 
         [0054]      FIG. 8  shows a top view of the structural component  3 , wherein the bearings  27  and  28  are already securely connected to the structural component  3 . Additionally, a joint socket  15  is shown which is formed as a hole extending through the structural component  3  in axial direction  10 , into which the ball joint  2  is inserted. The insertion of the ball joint  2  into the joint socket  15 , and the fastening of the ball joint  2  to the structural component  3  occur in a manner analogous to the first embodiment so that in this regard reference is made to the description of the first embodiment. The joint socket  15  is formed in the structural component  3  using laser beam cutting, also in a manner analogous to the first embodiment. However, the joint socket  15  is formed only after connecting the structural component  3  to the bearings  27  and  28 . Here, the location  29 , at which the joint socket  15  is formed, is determined depending on the positions  30  and  31  of the rubber bearings  27  and  28  already securely connected to the structural component  3 . The positions  30  and  31  of the rubber bearings  27  and  28  are represented particularly by the kinematic points thereof. Additionally, the location  29  preferably represents the location of the kinematic point of the ball joint  2  in the state securely connected to the structural component  3 . The location  29  particularly characterizes the center point of the joint socket  15 . After the location  29  has been determined, the joint socket  15  is cut into the structural component  3  using laser beam cutting, wherein simultaneously the surface coating  22  of the structural component  3  is removed in a region  26  surrounding the joint socket. Then, the prefabricated and partially decoated ball joint  2  according to  FIG. 9  is inserted into the joint socket  15 , which can be seen in  FIG. 10 .  FIG. 11  shows a section through the ball joint  2  according to  FIG. 10  along the section line  9 . After insertion of the ball joint  2  into the joint socket  15  of the structural component  3 , the joint cartridge  5  and the structural component  3  are welded together in the decoated regions  24  and  26  thereof, forming the welding seam  18 , which can be seen in  FIG. 12 . Finally, a bellows seal  8  is placed on the ball joint  2 , wherein  FIG. 13  shows a section through the ball joint  2  according to  FIG. 7  along the section line  9 . For further description of the ball joint  2  and the connection thereof to the structural component  3  reference is made to the description of the first embodiment. 
       REFERENCE LIST 
       [0000]    
       
           1  chassis component 
           2  ball joint 
           3  structural component 
           4  through hole 
           5  joint cartridge 
           6  ball pin 
           7  joint cartridge opening 
           8  bellows seal 
           9  longitudinal central axis of the ball joint 
           10  axial direction 
           11  ball joint of the ball pin 
           12  bearing shell 
           13  interior of the joint cartridge 
           14  wall of the joint cartridge 
           15  joint socket 
           16  circumferential collar of the joint cartridge 
           17  radial shoulder 
           18  weld seam 
           19  perimeter contour of the joint socket 
           20  outer peripheral surface of the joint cartridge 
           21  conical region of the outer peripheral surface of the joint cartridge 
           22  surface coating of the structural component 
           23  surface coating of the joint cartridge 
           24  decoated region of the joint cartridge 
           25  axial end region of the joint cartridge 
           26  decoated region of the structural component 
           27  rubber bearing 
           28  rubber bearing 
           29  location of bearing receptacle 
           30  position of the rubber bearing 
           31  position of the rubber bearing