DE102008047076A1 - Soldering component useful in a heat exchanger, comprises a first component and a second component, which are joined to each other in the area of a joining connection with a joining fit - Google Patents

Abstract

The soldering component (10) comprises a first component (1) and a second component (2), which are joined to each other in the area of a joining connection with a joining fit (3). The first component overlaps the second component in the area of the joining connection and the joining fit is formed by a molding process of one of the components. The component has an undercut for the formation of the joining fit. The undercut is incrementally developed from the distal end to the proximal area of the one of the components. The joining fit forms an area mechanically holding the component. The soldering component (10) comprises a first component (1) and a second component (2), which are joined to each other in the area of a joining connection with a joining fit (3). The first component overlaps the second component in the area of the joining connection and the joining fit is formed by a molding process of one of the components. The component has an undercut for the formation of the joining fit. The undercut is incrementally developed from the distal end to the proximal area of the one of the components. The joining fit forms an area mechanically holding the component and/or forms a press fit-area, which is arranged to the distal end of the one of the components. The joining fit has a further area with a gap, which continuously tapers itself from the proximal area to the distal end. The component has a wall thickness diminution in the area of the joining fit. The wall thickness diminution is incrementally developed from the distal end to the proximal area of the one of the components. The undercut is formed in the direction of the proximal area of the component in a continuously running manner, and is arranged only on first component for the formation of the joining fit. The first component encloses the second component in the area of the joining connection. The second component is a tube. The joining connection is formed in the form of a solder connection. The gap is disposed between a solder depot with a solder ring and the mechanically holding area of the joining fit. The joining fit has a base (G) that is formed in the form of a recess, to the proximal area of the one of the components and has an inner radius between the undercut and the base, where the radius has a finite curve. The solder depot is arranged in the area of the inner radius. The distal end of the one of the component is provided with a bevel to the other component. A cross-section of the joining fit lying transverse to an overlapping direction has a square-form or polygonal form. A blocking groove is provided at the first component to the proximal area.

Description

The The invention relates to a joining component with at least one first component and a second component, in the region of a joint connection are joined together with a mating fit, wherein the first component, the second component at least in the area overlaps the joint connection and the joint fit formed by a shape of at least one of the components is. Furthermore, the invention relates to a heat exchanger.

Especially The invention relates to a soldering component, wherein the joint connection is formed in the form of a solder joint.

At the Joining of components is often the problem that the individual components fixed to each other before joining should be. On the other hand, it is often necessary to have one with one Gap joint fit to be provided to make room for a joining agent.

This relates in particular to soldering components having a first component and second component soldered to one another, as is the case, for example, in the case of an exhaust manifold for an internal combustion engine EP 1365121 B1 is described. In such conventional solder joints, for example, a plate heater of DE 671 20 448.3 , This problem occurs regularly - it is a common joint gap provided in close proximity to a solder deposit, which is provided by a space between the first component and the second component, for example, a solder deposit in the form of a chamfer or a chamfered wall of the components.

In addition, this problem proves to be increasingly serious in compounds between a pipe and another component, such as a flange or other pipe od. Like. Problems of the type mentioned occur in solder joints even if, as in DE 10 2004 038 099 A1 , A distance space between the first and second component serves as a solder depot and a joint gap can develop capillary action. Although it is already possible to achieve a comparatively good solder joint due to the existing capillary action in the joint gap between the first and second component. However, there is no guarantee that a sufficient mechanical fixation of the first and second component to each other before the soldering process.

As long as one of the components, for. B. with a solder layer is plated, press fits are soldered, since the solder is already present in the joint fit and ensures by melting for a dense and firm solder joint. When soldering components that are not solder plated, Lot z. B. from a solder depot as in the DE 10 2004 038 099 A1 described, be supplied. On the other hand, an interference fit can not be penetrated by the solder, so that, if necessary, no pronounced solder meniscus can be reached from both sides of the connection.

EP 0 422 612 B1 provides an already improved joining component of the type mentioned, in which the joint fit is formed by a shape curve of at least one of the components. A diverging portion at the axially outer, ie, distal, end of a neck portion results in a wall thickness taper, thus providing a distal end placement area for a solder deposit. However, here too a fixation of the components to each other before the soldering process is missing.

Desirable would be a mating fit, which is to guarantee an improved joint connection on the one hand a sufficient mechanical fixation before joining allows and on the other hand has a sufficient gap, in particular suitable for the formation of a capillary action.

At this point is the invention of whose task it is a Specify joining component, which has an improved joint connection allows. In particular, the joining component should have a mating fit, which is a sufficient mechanical Fixation of the first and second component before the joining process allowed and on the other hand has a gap, preferably is sufficient to develop a beneficial capillary action. In a particularly preferred manner, a shape course should at least one the components are designed to perform the aforementioned tasks as possible advantageous to solve.

Concerning the joining component is the object of the invention by means of solved a joining component of the type mentioned, in the invention, the at least one component to form the joint fit has an undercut, the from the distal end to the proximal region of the at least one component is increasingly designed.

Under an undercut, which is increasingly designed, is according to the Concept of the invention, in particular to understand an undercut whose undercut is geometrically enlarged, d. H. where the undercut increases.

The concept of the invention relates in particular to a soldering component having at least a first component and a second component, which soldered together in the region of the solder connection with a soldered fit are, wherein the first component overlaps the second component at least in the region of the solder joint and the Lötpassung is formed by a shape of at least one of the components. It is provided that the at least one component for forming the Lötpassung has an undercut, which is increasingly designed from the distal end to the proximal region of the at least one component.

Under a proximal portion of the component is compared to a distal area of the area to understand the respect a reference point is closer than the distal region.

The Invention is based on the consideration that from the state the technology known distance spaces for training a fitting fit arise without a shape curve the components is substantially changed, the initially asked Do not fulfill the task. Bare chamfers or Chamfers or bends of peripheral areas of the involved Components, without the shape of their shape as wall thickness od. Like. Changed, can according to the consideration the invention is not required by the task initially stated Unfold their effect. The invention has recognized that a shape curve the at least one component for forming the jointing fit can be formed in the form of an undercut. To fulfillment The object mentioned at the outset is the undercut from the distal one End to the proximal region of the at least one component increasingly designed.

the Following concept of the invention has such a mating fit in particular the effect that the mating fit a the Components mechanical holding area forms, which the distal End of at least one component is arranged. Possibly the jointing fit, additionally or alternatively, also a press-fit area which mechanically holds the components forming, which the distal end of the at least one component is arranged to. It has also proven to be advantageous that Following the concept of the invention, the mating fit a having another region with gap. Preferably tapered In particular, the gap from the proximal region to the distal end continuously.

in the Frame of a particularly preferred constructive development according to the Concept of the invention is provided that the at least one component for forming the joint fit at least in the field of Joining joint a wall thickness rejuvenation which, from the distal end to the proximal region of at least a component is increasingly designed.

Such and similar measures in accordance with Concept of the invention ensure that a mating fit on the one hand is designed such that a mechanical support the first and second component to each other before the joining process and on the other hand a sufficient gap between the first and second component remains prior to joining; this, for example around a beneficial for a solder connection capillary action to ensure or a solder deposit available to make od. Like.

The Concept of the invention is not limited in principle on a solder joint, but rather can also other mating connection types with the concept of Invention advantageously be improved, for example, a welded joint or an adhesive bond.

advantageous Further developments of the invention are the dependent claims to take in particular and give advantageous opportunities the concept described above within the framework of the task as well as to realize further advantages.

It has proven to be particularly advantageous that the undercut running continuously towards the proximal region of the at least one component is formed. A continuous one Course, for example, a ramp-like oblique course with a certain angle has a particularly preferred balanced Effect - on the one hand to form a mechanical fixation the components before joining and on the other for training a sufficiently large joint gap, z. B. for Deployment of a capillary action.

About that In addition, it has proved to be advantageous that the undercut only on one, d. H. on a single component to form the Fitting fit is arranged. Particularly preferred is this only the first, the second component overlapping component intended. It has been shown that the machining of distal Ends especially with an overlapping component - or in the case of a nozzle od. Like., A surrounding component - particularly favorable in the context of a manufacturing process. Advantageous this is particularly the case when the first component is the second Surrounding component at least in the region of the joint connection. Preferably, the second component is a pipe.

Often, the included second component is already ready for further processing. The aforementioned development of the invention permits processing, for example, an inner knurling, on the first component, without the need for an additional production step on the second component. In particular, an inner fit on the first component is usually machined, so that a suitable embodiment of a joint fit according to the aforementioned training brings no significant cost relevance with it.

is formed a joint connection in the form of a solder joint it has proved to be advantageous that the joint fit a further region having a gap, which between a Lotdepot, for example in the form of a solder ring od. Like., And one arranged mechanically holding portion of the joint fit is. This has the advantage that the further a joint gap area on melting the solder deposit through the solder Capillary action in the narrower area of the joining gap - which before joining for mechanical fixation of the components serves - conduct can. This synergetic effect leads to a guarantee a particularly good solder joint according to the Concept of the invention.

in the Within the scope of a particularly preferred development of the invention In addition, provided that the joint fit has a formed in the form of a paragraph reason, the formed proximal portion of the at least one component. A radius of finite curvature passes between the undercut and the reason above. Under a radius of finite curvature is a radius to understand which has a curvature, the clearly above a usual machining-related Radius curvature is. Under a radius is in particular to understand an inner radius, preferably an inner radius at one first component, preferably the second component overlapping or surrounding component. It has been shown that a lot depot especially advantageously in the region of the radius, in particular in the region of the inner radius, arranged can be. This avoids adhesion of solder as it for example from edges or corner areas is known, which is merely a common processing conditions - in this sense infinitely small - radius curvature exhibit. In particular, in inner edges or corners, the capillary action high, so Lot would be held back in those areas. A according to the aforementioned training will a more effective utilization of the amount of solder used in the solder depot reached.

According to one Another particularly preferred embodiment provides that the distal end of the at least one component, preferably of the surrounding or overlapping component, with a chamfer is provided to the other component. In the event that the Capillary action should expel solder from the joint gap, The chamfer can absorb excess Serve Lot.

According to one another particularly preferred embodiment of the invention is provided a cross-section lying transversely to the direction of overlap the mating fit has a non-circular shape, for example an angular or polygonal shape od. Like. In a cross-sectional view results in advantageous that corner regions of such a non-circular shape a cross section particularly advantageous approximately linear Form capillary. The corner areas connecting, for example straightforward, stretching the non-round shape can be beneficial to the plant between the first and second component and thus to mechanical fixation of the same serve before joining. The development of a non-circular cross-sectional shape is used in an advantageous manner Way to improve the synergetic effect according to the concept the invention, which fix the components before the joint connection on the one hand and the advantageous embodiment of a joint gap reached on the other hand.

With In other words, a non-circular shape or the like has the advantage that this regularly at a second component surrounding first component leads to that especially one round inserted second component not over the entire Circumference is touched. This has the effect of being the lot a way is completely blocked outwards and the solder - practically in "plumb lines" - in the corner areas of the non-circular shape, for example a polygon od. Like., Is guided by the capillary action. As advantageous have solder capillary lines with dimensions ranging between 0.05 mm to 0.15 mm proved.

constructive Possibilities for the realization of a non-round shape are For example, deformations or knurls be it on first component on the outside or on the second component inside.

in the Frame of another particularly preferred embodiment of the invention is provided that at least one locking recess, for example a blocking groove od. Like., At the at least one component to the proximal Area is provided. A locking recess has in particular on first component proved advantageous. One or more locking recesses can od the migration of solder or flux. Like. especially when soldering in the interior of at least prevent a component.

The Task with respect to the heat exchanger is by a Heat exchanger of the type mentioned above, which with at least one joining component according to Concept of the invention, in particular a joining component according to one of provided previously mentioned training. At the joining component it is in particular a soldering component. A heat exchanger is especially intended for use in an automobile, such as a car or truck od. Like.

A heat exchanger according to the concept The invention regularly has a heat exchanger block provided for heat exchange. A heat exchanger block is provided with a plurality of fluid-carrying tubes for guiding a first fluid which is in a heat exchanging exchange with a second fluid flowing around the tubes. The tubes are preferably taken in a so-called tube bottom. A tube sheet has for better support of a tube advantageously an upstanding collar, wherein a collar includes a pipe end in particular a nozzle.

A Joining connection according to the concept of The invention has proven particularly advantageous in solder joints of tubes on the tubesheet or pipe parts to each other.

One Tube bottom is preferred on a housing of the heat exchanger fastened, wherein the housing advantageously the heat exchanger block surrounds and with feeders for the second, the Pipes flowing around the fluid is provided. This is how a tube sheet is used the supply of the first fluid to the tubes separately from second fluid. The attachment of a tube plate to the housing can also be advantageous in the context of a joint connection according to the concept of the invention. As well can be a joint connection according to the concept the invention for the connection of a diffuser on the heat exchanger housing and / or performed on the tube sheet.

Other - Conceptual analogous construction - heat exchangers see the joining, in particular soldering of so-called plates before to between the plates tube-like spaces for guiding a To form fluids. Also such and other solder joints as they can accumulate in a heat exchanger in the frame of the concept of the invention.

embodiments The invention will now be described below with reference to the drawing. This is not necessarily the embodiments to scale, rather the drawing is where appropriate for illustrative purposes, in schematic and / or slightly distorted shape. With regard to supplements the teachings directly recognizable from the drawing will be referred to the pertinent ones Referenced prior art. It is important to take into account that varied modifications and changes concerning the shape and the detail of an embodiment can be made without departing from the general idea to deviate from the invention. The in the description, in the drawing and in the claims disclosed features of the invention can be used individually or in any combination be essential for the development of the invention. moreover fall within the scope of the invention, all combinations of at least two in the description, the drawing and / or the claims disclosed features. The general idea of the invention is not limited to the exact shape or detail shown below and described preferred embodiment or limited on an object that would be restricted in Comparison to the subject matter claimed in the claims. For specified design ranges should also within the specified Limiting values are disclosed as limit values and can be used as desired and claimable.

in the Individual shows the drawing in:

1 a structural design of a mating fit between a first component and a second component in a joining component according to a particularly preferred embodiment of the invention before the joining operation;

2 : the joint of the 1 after the joining process;

3 : the joint of the 1 before the joining process in a plan view;

4 Exemplary joining components for a heat exchanger according to a preferred embodiment - in view (A) a component consisting of two tubes - in view (B) a component consisting of a tube and a tubesheet.

The 1 schematically shows a joining component 10 a particularly preferred embodiment according to the concept of the invention with a first component 1 and a second component 2 , The joining component 10 is presently shown in a state prior to joining. The condition of the joining component 10 after joining is as a joining component 10 ' in 2 shown. The joining component 10 . 10 ' is in a cross-sectional top view 3 shown.

In the present case, the first component surrounds 1 the second component 2 circumferentially in area B of the joint. The first component 1 is present in the form of a branch while the second component 2 is formed in the form of a tube, with a mating fit 3 , which is explained in more detail below, is inserted into the first component. The joint fit 3 is present by a shape curve only of the first component 1 formed, ie specifically by machining the distal end in the interior of the nozzle-like first component 1 ,

For this purpose, the nozzle-like first component 1 in this case in continuation of the nozzle wall 5 a stanchion collar disposed at the distal end 7 with in comparison to the neck wall 5 reduced wall thickness D on. The wall thickness D is just before the final end 9 of the neck collar 7 assumed, namely at the with the reference numeral 11 designated place.

To the distal end beyond the spot 11 , follows the wall thickness of the skirt collar 7 rejuvenating chamfering 13 , The chamfering 13 has, inter alia, the effect that the tubular formed second component 2 without major problems, optionally self-adjusting, in the nozzle-like first component 1 can be used. In addition, the chamfer opens 13 a clearance space between the first component 1 and the second component 2 which can optionally serve to receive excess solder of the presently formed as a solder joint connection in the region of the joint fit.

The proximal region of the first component 1 in front of the spot 11 the wall thickness of the collar tapers too 7 from the largest value D to a smallest value d. The smallest value d is assumed shortly before the bottom G, which stepwise between the wall thickness of the Stutzenkragens 7 and the thicker neck wall 5 of the first component 1 leads over. The transition between the bottom G and the area of the minimum wall thickness d of the Stutzenenkragens 7 is due to an existing inner radius R in the proximal region of the mating fit 3 educated.

This is present for the formation of the joint fit 3 on the first component 1 performed an undercut, which - by reducing the wall thickness D of Stutzenkragens 7 to the wall thickness d of the Stutzenkragens 7 From the distal end to the proximal region of the first component 1 is increasingly designed; in other words, the undercut increases while the wall thickness decreases. This trained form course on the stanchion collar 7 of the first component 1 leads to the formation of a first region B1, which is suitable for the second tubular component 2 in the nozzle-like first component 1 already before a joining process, in this case a soldering process, mechanically fix. If appropriate, the first region B1 can also be solder-plated. This measure of the previously executed structural design of the shape of the first component 1 ie on the collar 7 , has the significant advantage of having additional fixing measures for holding the first component 1 and second component 2 can be practically eliminated before the soldering process. Nevertheless, by the chamfering described above 13 ensures that the second component 2 easily self-adjusting in the first component 1 can be used.

The previously described joint fitting 3 Moreover, it is constructively designed in such a way that a gap is formed in a second region B2 which extends from the proximal region to the distal end of the first component 1 rejuvenated. In the present case, the gap tapers 15 in the second area B2 continuously. The gap 15 is presently formed with an average of 0.1 mm and thus allows a particularly good by the continuously tapered shape still enhanced capillary action for receiving a solder. A Lotvorrat is presently arranged in the third area B3 formed as a Lotdepot distance space. The lot 17 is presently formed in the form of a solder ring. The lot 17 is present in particular at the transition inner radius R arranged. This has the significant advantage that when melting the solder 17 the adhesion forces of the solder are largely reduced by forming the inner radius R adapted to the solder shape, so that a capillary effect caused by the gap can develop optimally. In other words, any adhesion forces compared to capillary forces are kept comparatively low in the present structural design of the Fügepassung 3 ,

How out 2 can be seen, the formation of the undercut at an angle α in the range of about 30 ° together with an inner radius of about 3 mm leads to a particularly preferred solder joint between the first component 1 and the second component 2 ,

In principle, in other embodiments, a gap size of on average in the range between 0.05 mm to 0.15 mm can be performed. An inner radius R can also be carried out, for example, in a range between 2 mm and 10 mm. The angle α of the undercut to form the joint fit 3 can be chosen in a range between 10 ° and 45 ° advantageous. Ultimately, a selection of the aforementioned parameters in consideration of the wall thickness of the components to be joined 1 . 2 and the necessary strength of a solder joint selected.

In addition, the first component points 1 in the further axial course towards the proximal region, one in the wall 5 introduced locking groove 14 on. The locking groove 14 serves - much like the bevel 13 at the distal end - in the proximal region of the first component 1 to absorb excess solder or other flux. This will result in overflowing solder entering the flow channel 25 in the interior of the first and second component 1 . 2 prevented. A flow cross section 25 So it is through the locking groove 14 optimized as possible. Other embodiments, not shown here, beyond the locking groove 14 and / or the chamfer 13 vary constructively. Likewise, in other embodiments, more than one locking groove 14 be carried out, for example, in succession or enlarged.

In the present embodiment of a joining component 10 . 10 ' In addition, a particularly good solder joint is ensured by that, as from 3 it can be seen, in a transverse to the component extension section plane, the first component 1 a polygonal inner cross section 19 has - and thus a non-circular shape, compared to the round shape of the second component 2 at its outer cross section. Thus, corner areas 21 the polygonal shape 19 and the corner areas 21 connecting routes 22 formed the polygonal shape. The corner areas 21 are spaced from the round shape of the outer cross section of the second component 2 and thus form in this embodiment advantageous achsärts extending line-shaped Lotkapillare 23 , In the line-shaped, perpendicularly running Lotkapillaren 23 is the capillary action on the solder 17 considerably increased. This leads to a particularly good Meniskusausbildung and especially advantageous large height of the Lots 17 in the solder capillaries 23 , The present solder joint as in the embodiment of the 1 to 3 is shown, is thus suitable especially for relatively long-axis connection areas B of a joining component 10 . 10 ' ,

In addition, the track areas serve 22 due to their installation on the first and second component 1 . 2 to, the first and second component 1 . 2 to mechanically hold or fix each other before joining.

Overall, a significantly improved compared to the prior art holder of a first and second component 1 . 2 at a joining component 10 . 10 ' achieved before and after joining.

4 shows in view A a first possibility of execution of a joining component 10 . 10 ' - here in the form of a pipe connection 20 in which the first component 1 and the second component 2 each formed in the form of a tube.

View B the 4 shows only a second possibility of execution of a joining component 10 . 10 ' - Here in the form of a solder joint between a first component 1 forming tube sheet and the second component 2 forming pipe.

at The figures were the same for the same parts or parts Function uses the same reference numerals.

In summary, the invention relates to a joining component 10 . 10 ' with at least a first component 1 and a second component 2 in the area B of a joint connection with a joint fit 3 are joined to each other, wherein the first component 1 the second component 2 overlaps at least in the area B of the joint connection and the joint fit 3 by a shape of at least one of the components 1 . 2 is formed, wherein the at least one component 1 . 2 for the formation of the joint fit 3 an undercut extending from the distal end to the proximal region of the at least one component 1 . 2 is increasingly designed.

1

first component

2

second component

3

Fügepassung

5

Stutz wall

7

Stutz collar

9

final The End

11

Job

13

chamfer

14

locking groove

15

gap

17

solder

19

Internal cross-section

20

pipe connection

21

corner areas

22

haul

23

Lotkapillare

25

A lazy river, Flow area

10 10 '

joining component

B

Area, long-axis connection areas

B1

first Area

B2

second Area

B3

third Area

D

Wall thickness

D

largest value

d

smallest value

G

reason

R

inner radius

α

angle

QUOTES INCLUDE IN THE DESCRIPTION

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.

Cited patent literature

• - EP 1365121 B1 [0004]
• - DE 67120448 [0004]
• - DE 102004038099 A1 [0005, 0006]
• - EP 0422612 B1 [0007]

Claims (16)

Joining component ( 10 . 10 ' ), in particular soldering component, with at least one first component ( 1 ) and a second component ( 2 ), which in the region (B) of a joint connection with a mating fit ( 3 ) are joined together, wherein the first component ( 1 ) the second component ( 2 ) overlaps at least in the region (B) of the joint connection and the joint fit ( 3 ) by a shape of at least one of the components ( 1 . 2 ), characterized in that the at least one component ( 1 . 2 ) for forming the joint fit ( 3 ) has an undercut extending from the distal end to the proximal region of the at least one component ( 1 . 2 ) is increasingly designed. Joining component ( 10 . 10 ' ) according to claim 1; characterized in that the mating fit ( 3 ) one the components ( 1 . 2 ) forms a mechanically holding region (B1) and / or forms a press-fit region, which adjoins the distal end of the at least one component (B1). 1 . 2 ) is arranged to. Joining component ( 10 . 10 ' ) according to claim 1 or 2; characterized in that the mating fit ( 3 ) a further region (B2) with gap ( 15 ), in particular from the proximal region (B) to the distal end of the tapering, preferably continuously tapered, gap ( 15 ) having. Joining component ( 10 . 10 ' ) according to one of claims 1 to 3, characterized in that the at least one component ( 1 . 2 ) for forming the joint fit ( 3 ) has at least in the region of the joint connection a wall thickness taper, which from the distal end to the proximal region of the at least one component ( 1 . 2 ) is increasingly designed. Joining component ( 10 . 10 ' ) according to one of claims 1 to 4, characterized in that the undercut running continuously in the direction of the proximal region of the at least one component ( 1 . 2 ) is trained. Joining component ( 10 . 10 ' ) according to one of claims 1 to 5, characterized in that the undercut on only one component ( 1 . 2 ), especially only the first ( 1 ), for the formation of the mating fit ( 3 ) is arranged. Joining component ( 10 . 10 ' ) according to one of claims 1 to 6, characterized in that the first component ( 1 ) the second component ( 2 ) surrounds at least in the area joint connection. Joining component ( 10 . 10 ' ) according to one of claims 1 to 7, characterized in that at least the second component ( 2 ) is a pipe. Joining component ( 10 . 10 ' ) according to one of claims 1 to 8, characterized in that the joint connection is formed in the form of a solder joint. Joining component ( 10 . 10 ' ) according to one of claims 1 to 9, characterized in that the mating fit ( 3 ) another area with gap ( 15 ), which between a solder depot, in particular with a solder ring, and a mechanically holding portion of the Fügepassung ( 3 ) is arranged. Joining component ( 10 . 10 ' ) according to one of claims 1 to 10, characterized in that the mating fit ( 3 ) a base (G) formed in the form of a shoulder to the proximal region of the at least one component ( 1 . 2 ) and a radius of finite curvature, in particular inner radius (R), between the undercut and the ground (G) passes. Joining component ( 10 . 10 ' ) according to one of claims 1 to 11, characterized in that a solder deposit in the region of the radius, in particular in the region (B) of the inner radius (R), is arranged. Joining component ( 10 . 10 ' ) according to one of claims 1 to 12, characterized in that the distal end of the at least one component ( 1 . 2 ) with a chamfer ( 13 ) to the other component ( 1 . 2 ) is provided. Joining component ( 10 . 10 ' ) according to one of claims 1 to 13, characterized in that a cross-section lying transversely to the overlap direction of the joint fit ( 3 ) has a non-circular shape, in particular an angular or polygonal shape. Joining component ( 10 . 10 ' ) according to one of claims 1 to 14, characterized in that at least one locking groove ( 14 ) on the at least one component ( 1 . 2 ), in particular on the first component ( 1 ), is provided toward the proximal region. Heat exchanger with at least one joining component ( 10 . 10 ' ), in particular soldering component, according to one of claims 1 to 15.