Method for producing a fluid line, and such a fluid line

Abstract

The invention relates to a method for producing a fluid line (10), having the following steps: a) providing a first pipe piece (12), a corrugated hose (14), and a second pipe piece (16), the corrugated hose (14) and the pipe pieces (12, 16) being aligned one behind the other along a longitudinal axis (L) and the corrugated hose (14) being positioned between the two pipe pieces (12, 16), and b) welding the corrugated hose (14) to the two pipe pieces (12, 16), a first end (18) of the corrugated hose (14) being welded directly and circumferentially to the first pipe piece (12), a second end (19) of the corrugated hose (14) being welded directly and circumferentially to the second pipe piece (16), and the process of welding the first pipe piece (12) to the corrugated hose (14) and the process of welding the second pipe piece (16) to the corrugated hose being started at the same time. The invention also relates to such a fluid line (10).

Description

[0001] Applicant:

[0002] BOA Metal Solutions GmbH Lorenzstraße 2-6

[0003] 76297 Stutensee

[0004] 06450157WO 15.09.2025

[0005] ELL / MAY

[0006] Title: Method for manufacturing a fluid line and such a fluid line

[0007] Description

[0008] The present invention relates to a method for manufacturing a fluid line. Furthermore, the invention relates to such a fluid line.

[0009] To date, many fluid lines used in motor vehicles (e.g., brake lines, air conditioning lines, or oil lines) are at least partially made of plastic and contain fluorine. Such fluid lines are inexpensive to manufacture and relatively robust. Due to risks to human health and the environment, there are calls to discontinue the use of such fluid lines. Methods for manufacturing such fluid lines and such fluid lines are known from the prior art. For example, patent CN 104 646 962 A discloses an oil return line for a turbocharger and a method for manufacturing the oil return line. The oil return line has a pipe section with a corrugated section. Flanges are welded to each end.The manufacturing process involves first forming the corrugated section of the (one-piece) pipe section using hydroforming, followed by bending. The present design, with a pipe section formed by hydroforming, results in a complex manufacturing process, where the chosen pipe cross-section always represents a compromise (sections with hydroforming on the one hand and uncorrugated sections on the other).

[0010] The invention is based on the objective of being able to produce robust fluid lines quickly and cost-effectively using structurally simple means.

[0011] The invention solves this problem by means of a method having the features of claim 1.

[0012] The procedure is designed and / or intended for the production of a fluid line. The procedure comprises the steps described below.

[0013] In step a), a first pipe section, a corrugated hose, and a second pipe section are provided. The corrugated hose and the pipe sections are arranged in alignment along a longitudinal axis, with the corrugated hose positioned between the two pipe sections. In step b), the corrugated hose is welded to the two pipe sections, with the corrugated hose being welded at a first end.

[0014] The first end of the corrugated hose is welded directly and completely to the first pipe section. At a second end (the second end of the corrugated hose), the corrugated hose is welded directly and completely to the second pipe section. The welding of the first and second pipe sections to the corrugated hose is started simultaneously.

[0015] In other words, the welding of the pipe sections to the corrugated hose is achieved by starting the welding process simultaneously in a single operation (starting welding at two points at once). Before welding, the corrugated hose and the two pipe sections are separate components. The corrugated hose and the two pipe sections are welded directly together, i.e., apart from the welding material, without any other joining partner (no additional connecting element). The pipe sections and the corrugated hose are preferably each made of metal.

[0016] The proposed method, due to the simultaneous initiation of welding, contributes to the rapid production of the fluid line. Since the corrugated hose and pipe sections are separate components prior to welding, they can be selected and, if necessary, prepared independently. By welding the corrugated hose and pipe sections directly without an additional connecting element, the number of components of the oil line and the number of components to be joined are reduced. This contributes to simplified manufacturing. In this way, a series production process, and thus mass production, can be implemented, enabling comparatively high production volumes (e.g., 800-1000 units per day using a single production device). As a result of this cost-effective and rapid production, the proposed fluid line can, for example, be used in...Replace rubber hoses used in the automotive sector. The replacement fluid hoses do not contain fluorine.

[0017] The fluid line can be designed and / or intended to carry a pressurized medium. The line is designed to carry liquid media that are pressurized and may have a temperature above ambient temperature, e.g., between 70°C and 150°C. Specifically, the fluid line can optionally be configured as an oil line, particularly an oil supply line, a brake line, or an air conditioning line.

[0018] As explained above, the welding of the first and second pipe sections to the corrugated hose can be started simultaneously. This allows the welding of these components to overlap, meaning it can occur at least partially simultaneously. Ideally, the welding of the first and second pipe sections to the corrugated hose can be (completely) simultaneous.

[0019] In a preferred embodiment, the corrugated hose, which has several solid corrugations (each solid corrugation is formed from an inner corrugation (trough) and an outer corrugation (crest)), and the two pipe sections can be positioned one behind the other along the longitudinal axis in step a) such that they (the corrugated hose and each of the pipe sections) overlap by less than one solid corrugation along the longitudinal axis. The overlap is preferably a maximum of one outer corrugation, in particular half an outer corrugation (the clear dimension on the inside of the outer corrugation). Thus, the corrugated hose and the two pipe sections are welded together with only a minimal overlap. This contributes to low material requirements and a low weight for the corrugated hose and the pipe sections.The pipe sections can each have an outwardly widened and / or form-fitting joining section at their end facing the corrugated hose. The joining section can be formed integrally with the respective pipe section.

[0020] Advantageously, in step a), an annular fitting can be provided at the end of the second pipe section opposite the corrugated hose. In step b), while welding the corrugated hose to the pipe sections, the welding of the annular fitting to the second pipe section is also started simultaneously (simultaneous initiation of welding at three welding points). Thus, the welding of both pipe sections to the corrugated hose and the annular fitting on the second pipe section is initiated simultaneously in a single operation. This facilitates the rapid production of the fluid line. The welding of these components can overlap in time, i.e., occur at least partially simultaneously. Ideally, the components can be welded (completely) simultaneously.In a preferred embodiment, the welding of the two pipe sections to the corrugated hose and / or the welding of the annular fitting to the second pipe section can each be carried out using an orbital welding process. The orbital welding process offers the advantage of high reproducibility and precision of the weld seams (automated and computer-controlled process). Furthermore, it facilitates welding in constrained positions, which leads to improved weld seam quality (even in hard-to-reach areas).

[0021] Advantageously, the corrugated hose and pipe sections, preferably also the annular fitting, can remain stationary relative to the longitudinal axis during welding (no rotational movement), while a welding device performing the orbital welding process rotates around the longitudinal axis (during the welding of the components together). This facilitates the arrangement and alignment of the components to be welded (corrugated hose, pipe sections and / or annular fitting) relative to each other, whereby only the welding units of the welding device need to rotate around the longitudinal axis.

[0022] The welding device can specifically comprise three welding units, each configured to process one of the three aforementioned welding points (welding the components at the respective welding point). Each of the three welding units can have its own mounting and be rotatably mounted on a base of the welding device by means of this mounting, such that the welding units rotate about the aforementioned longitudinal axis when driven, in particular independently of one another. In this way, welding of the components at the three welding points can be carried out.

[0023] Each of the three welding units is preferably equipped with its own drive and can be operated with individual welding parameters (such as current, voltage and / or welding speed, etc.). The only common feature is the axis of rotation around which the welding units move orbitally.

[0024] Advantageously, the first and second pipe sections can each extend in a straight line along their central longitudinal axis before and / or during welding, with the first and second pipe sections being reshaped after welding. Reshaping the pipe sections only after welding facilitates the welding process. This results in smaller dimensions for the components perpendicular to the longitudinal axis. This simplifies the arrangement of the components relative to each other and contributes to easy access to the weld points. Furthermore, in an orbital welding process, the welding fixture can be more compact, as the welding units can be welded with a comparatively small distance around the longitudinal axis. This also facilitates the handling of a fluid line after welding (before reshaping), for example, its removal from the welding fixture.

[0025] The aforementioned task is further solved by a fluid line, which is manufactured using a method incorporating one or more of the aspects described above. As already indicated above, the fluid line can optionally be designed as an oil guide line, in particular an oil supply line.

[0026] Regarding the advantages, reference is made to the relevant explanations of the manufacturing process described above. The measures described above and / or those explained below can be used for further development of the fluid line.

[0027] The aforementioned problem is also solved by a fluid line with the features of the further subordinate claim.

[0028] In the optional configuration of the fluid line as an oil guide line, in particular an oil supply line, it is designed and / or intended for guiding or supplying oil, e.g. to motor vehicles, especially to drive units such as electric or combustion engines or their auxiliary units.

[0029] The fluid line comprises a first pipe section, a corrugated hose, and a second pipe section. The corrugated hose and the pipe sections are arranged in a straight line along a longitudinal axis, with the corrugated hose positioned between the two pipe sections.

[0030] The corrugated hose is directly and completely welded to the first pipe section at one end (first end of the corrugated hose). Furthermore, the corrugated hose is directly and completely welded to the second pipe section at a second end (second end of the corrugated hose). Before welding, the corrugated hose and the two pipe sections are separate components. After welding, the corrugated hose is seamlessly connected to the two pipe sections. The corrugated hose and the two pipe sections are welded directly; that is, apart from the welding material, there is no additional connecting element (no other joining partner). The pipe sections and the corrugated hose are preferably each made of metal.

[0031] Regarding the advantages, reference is made to the relevant explanations of the manufacturing process described above. The measures described above and / or those explained below can be used for further development of the fluid line.

[0032] In a preferred embodiment, the corrugated hose can have several solid corrugations, each consisting of an inner corrugation (trough) and an outer corrugation (crest). The hose has an outer corrugation cut off at each end at the apex (outer reversal point on the outer corrugation), where the hose is welded to the first and second pipe sections. In other words, the hose is cut off at the apex of an outer corrugation at each end and welded to the first and second pipe sections at this point. This allows good accessibility to the weld points and therefore contributes to high weld quality. Furthermore, welding "radially as far out as possible" allows for a high resistance bending moment, which improves the stability of the hose.

[0033] Fluid flow is facilitated. Advantageously, the corrugated hose, which has several solid corrugations (each solid corrugation is formed from an inner corrugation (trough) and an outer corrugation (crest)), and the two pipe sections can be positioned one behind the other along the longitudinal axis such that they (the corrugated hose and each of the pipe sections) overlap by less than one solid corrugation along the longitudinal axis. The overlap is preferably a maximum of one outer corrugation, in particular half an outer corrugation (the clear dimension on the inside of the outer corrugation). Thus, the corrugated hose and the two pipe sections are welded together with only a minimal overlap. This contributes to low material requirements and a low weight for the corrugated hose and the pipe sections.The pipe sections can each have an outwardly widened and / or form-fitting joining section at their end facing the corrugated hose.

[0034] Advantageously, the first pipe section can have two spaced-apart (axially) compressed sections at its end furthest from the corrugated hose. These compressed sections each have enlarged outer dimensions, particularly a larger diameter, and the two compressed sections accommodate an O-ring between them. In other words, the spaced-apart sections are axially compressed and radially expanded (larger outer diameter). These compressed sections can be formed on the first pipe section before welding. Thus, the O-ring can be held on the first pipe section solely by these two sections (no additional connecting elements are required). This reduces the number of components in the fluid line. In a preferred embodiment, the O-ring can be attached to the first pipe section by the...

[0035] At the end of the second pipe section furthest from the corrugated hose, a ring fitting is welded on, into which a banjo bolt is inserted. This allows for a simple and reliable (especially pressure-tight) connection of the fluid line, for example, to a drive motor or its auxiliary unit, as already indicated above. The banjo bolt can establish a flow connection to the interior of the fluid line via a hollow channel in the bolt shaft and a through-hole.

[0036] Advantageously, a seal can be provided on the fluid line, comprising two interconnected sealing sections. The first sealing section is arranged between the screw head of the hollow screw and an annular section of the annular fitting, and the second sealing section engages the annular section of the annular fitting on the side facing away from the screw head. The two sealing sections are connected by a connecting section, which is preferably oriented at right angles to the sealing sections. This design of the seal facilitates the assembly of the fluid line, as only one element needs to be handled and installed instead of two separate seals. Furthermore, the sealing sections can optionally be held against the annular fitting due to their connection (assembly aid), which further simplifies assembly. The seal can be made of copper (copper seal).

[0037] Optionally, the fluid line can be equipped with a captive fastener that securely holds the banjo bolt and the seal to the ring fitting. This prevents the loss of individual components, for example, during transport to the customer or during assembly of the fluid line, as the captive fastener can only be removed immediately before assembly. The captive fastener can have a first retaining section that grips the banjo bolt at the bolt head and a second retaining section that grips the seal on the side facing away from the ring fitting. The two retaining sections can be connected by a connecting section designed as a gripping section. The gripping section is designed so that an operator can grasp the captive fastener and remove it from the secured components. The captive fastener can be made of plastic.

[0038] In a preferred embodiment, the first and second pipe sections can have identical cross-sections and / or the second pipe section can be longer than the first (length of the pipe sections measured along the neutral fiber or pipe core). Identical pipe cross-sections simplify procurement (only pipes with a uniform cross-section are required) and facilitate the welding process, as virtually identical welding operations take place at both ends of the corrugated hose (virtually identical heat input). The greater length of the second pipe section allows it to be shaped accordingly and adapted to the connection requirements.

[0039] Optionally, a bracket can be welded to both the first and second pipe sections, allowing the fluid line to be attached to a component, such as a drive motor or its auxiliary unit. Each bracket can have a through-hole. The bracket on the first pipe section is located near the free end of the first pipe section, the end furthest from the corrugated hose (adjacent to the compressed sections).

[0040] The invention is explained in more detail below with reference to the figures, wherein identical or functionally equivalent elements are provided with identical reference numerals, possibly only once. The figures show:

[0041] Fig. 1a shows a schematic side view of a fluid line design before welding and a welding device;

[0042] Fig. 1b is an enlarged and cutaway partial view of the fluid line according to figure 1a with corrugated hose as well as first pipe section and second pipe section;

[0043] Fig. 2a shows a further enlarged and cutaway partial view of the fluid line according to figure 1a with a section of the corrugated hose and a section of the second pipe section;

[0044] Fig. 2b shows the welded joint of the corrugated hose with the second pipe section in an enlarged and cutaway partial view;

[0045] Fig. 3 shows the fluid line from figure 1a after a transformation and with the components mounted;

[0046] Fig. 4a-e individual components of the fluid line and in

[0047] Unique feature, namely a seal (Figure 4a), a hollow screw (Figure 4b), a ring fitting (Figure 4c), spaced and compressed sections (Figure 4d) and a locking device holding the hollow screw and the seal on the ring fitting.

[0048] Figures 1a to 2b illustrate a method for manufacturing a fluid line 10. In the example, the fluid line 10 is an oil guide line.

[0049] First, a first pipe section 12, a corrugated hose 14, and a second pipe section 16 are provided (separate components). The corrugated hose 14 and the pipe sections 12 and 16 are arranged one behind the other along a longitudinal axis L, with the corrugated hose 14 positioned axially between the two pipe sections 12 and 16 (step a).

[0050] The corrugated hose 14 is then welded to the two pipe sections 12 and 16. At a first end 18 (first end of the corrugated hose), the hose 14 is welded directly (with welding material, but without any other joining partner) and circumferentially to the first pipe section 12. At a second end 19 (second end of the corrugated hose), the hose 14 is welded directly (with welding material, but without any other joining partner) and circumferentially to the second pipe section 16 (see also weld seam N in Figure 2b). The welding of the first pipe section 12 and the second pipe section 16 to the corrugated hose 14 is started simultaneously (step b). As explained above, the welding of the components can overlap in time, i.e., take place at least partially simultaneously. The pipe sections 12 and 16 and the corrugated hose 14 are made of metal.The corrugated hose 14 has several solid waves 20, each solid wave 20 being formed from an inner wave 20' (trough) and an outer wave 20'' (crest) (see Fig. 2a and 2b). In step a), the corrugated hose 14 and the two pipe sections 12, 16 are positioned one behind the other along the longitudinal axis L such that the corrugated hose 14 and the two pipe sections 12, 16 overlap by less than one solid wave 20 along the longitudinal axis L.

[0051] In this example, the overlap is half an outer shaft 20'' (clear dimension on the inside of the outer shaft 20''). The pipe sections 12, 16 have, at their end facing the corrugated hose 14, an outwardly widened joining section 24 that conforms to the inner contour of the outer shaft 20'' (see Figures 1b and 2b). The joining section 24 is formed integrally with the respective pipe section 12, 16.

[0052] In step a) ), an annular fitting 26 is provided at the end 25 of the second pipe section 16 furthest from the corrugated hose 14 (see Fig. 1a). When the corrugated hose 14 is welded to the pipe sections 12 and 16, the welding of the annular fitting 26 to the second pipe section 16 is started simultaneously (in step b) ) (simultaneous start of welding at three welding points 18', 19', and 25'). As explained above, the welding of the components can overlap in time. The welding of the annular fitting 26 to the second pipe section 16 can be carried out at a lower speed than the welding on the corrugated hose 14. The welding of the two pipe sections 12 and 16 to the corrugated hose 14 and the welding of the annular fitting 26 to the second pipe section 16 are each carried out using an orbital welding process.

[0053] In this case, the corrugated hose 14 and the pipe sections 12, 16, and the annular fitting 26 are stationary with respect to the longitudinal axis L during welding (no rotational movement). A welding device 100 performing the orbital welding process rotates around the longitudinal axis L while welding the components 12, 14, 16, 26 together.

[0054] The welding device 100 is shown schematically in figure aa.

[0055] In the example, the welding device 100 has three welding units 102, 104, 106, which are set up to each process one of the three above-mentioned welding points 18', 19', 25' (welding the components 12, 14, 16, 26) at the respective welding point).

[0056] The welding units 102 and 104 each have their own receptacle 108, 108' and are rotatably mounted on a (here only schematically indicated) base 110 of the welding device 100 by means of the receptacle 108, 108' such that the welding units 102, 104 rotate about the longitudinal axis L when driven, wherein the welding units 102, 104 can be moved independently of each other.

[0057] The welding unit 106 is coupled to a further mounting 108'' and is rotatably mounted on the base 110 of the welding device 100 by means of the mounting 108' such that the welding unit 106 rotates about the longitudinal axis L when driven. In this way, the components 12, 14, 16, 26 can be welded at the three welding points 18', 19', 25'. The welding unit 106 can optionally rotate about the longitudinal axis L at a lower speed than the welding units 102, 104. The welding units 102, 104, in turn, can rotate about the longitudinal axis L at different speeds.

[0058] Each of the welding units 102, 104, and 106 in this example has its own drive and can be operated with individual welding parameters (current, voltage, and / or welding speed, etc.). The common feature is the axis of rotation L, around which the welding units 102, 104, and 106 move (orbitally).

[0059] In the present case, the first pipe section 12 and the second pipe section 16 extend in a straight line along their central longitudinal axis before and during welding (the central longitudinal axis coincides with the longitudinal axis L after the pipe sections 12, 16 are aligned), whereby the first pipe section 12 and the second pipe section 16 are reshaped after welding (see Figure 3).

[0060] The fluid line 10 can be manufactured using the method described above.

[0061] The design of the fluid line is described in more detail below. As already indicated, the fluid line 10 comprises a first pipe section 12, a corrugated hose 14, and a second pipe section 16 (see Figure 1a). The corrugated hose 14 and the pipe sections 12 and 16 are arranged in a straight line along a longitudinal axis L, with the corrugated hose 14 positioned between the two pipe sections 12 and 16.

[0062] The corrugated hose 14 is directly and circumferentially welded to the first pipe section 12 at a first end 18 (first end of the corrugated hose). Furthermore, the corrugated hose 14 is directly and circumferentially welded to the second pipe section 16 at a second end 19 (second end of the corrugated hose) (see also Figure 1b).

[0063] The corrugated hose 14 has several solid corrugations 20, each consisting of an inner corrugation 20' (trough) and an outer corrugation 20'' (crest). At both ends 18, 19, the corrugated hose 14 has an outer corrugation 20'' that is cut off at the apex S (outer reversal point on the outer corrugation 20''), to which the corrugated hose 14 is welded to the first pipe section 12 and the second pipe section 16 (see Figures 2a and 2b).

[0064] The corrugated hose 14 and the two pipe sections 12, 16 are positioned one behind the other along the longitudinal axis L such that the corrugated hose 14 and each of the pipe sections 12, 16 overlap by less than one full corrugation 20 along the longitudinal axis L. In this example, the overlap is half an outer corrugation 20'' (clear dimension at the

[0065] Inside of the outer shaft; see Figure 2b). In the example, the first pipe section 12 has two spaced-apart (axially) compressed sections 32 at its end 30 facing away from the corrugated hose 14, where the first pipe section has enlarged outer dimensions (larger diameter) (see Figures 1a, 3, 4d). The two compressed sections 32 accommodate an O-ring 34 between them (see Figure 3). In other words, the spaced-apart sections 32 are axially compressed and radially expanded (enlarged outer diameter).

[0066] At the end 25 of the second pipe section 16, facing away from the corrugated hose 14, an annular fitting 26 is welded on, in which a hollow screw 36 is received (see Figures 3 and 4b). The hollow screw 36 can establish a flow connection to the interior 11 of the fluid line 10 via a hollow channel 37 in the screw shaft and a passage 38.

[0067] A seal 40 is provided on the fluid line 10, comprising two interconnected sealing sections 41 and 42 (see Figures 3 and 4a). The first sealing section 41 is arranged between the screw head of the hollow screw 36 and an annular section of the annular fitting 26. The second sealing section 42 engages the annular section of the annular fitting 26 on the side facing away from the screw head. The two sealing sections 41 and 42 are connected by a connecting section 43, which in this example is oriented at right angles to the sealing sections 41 and 42. The seal 40 is made of copper (copper seal).

[0068] In this case, the fluid line 10 has a retaining device 46 that holds the hollow screw 36 and the seal 40 on the annular fitting 26 (see Figures 3 and 4e). The retaining device 46 has a first retaining section 47 that engages the hollow screw 36 at the screw head, and a second retaining section 48 that engages the seal 40 on the side facing away from the annular fitting 26. The two retaining sections 47 and 48 are connected by a connecting section 49, which is designed as a handle. An operator can use this handle to grasp the retaining device 46 and pull it away from the secured components. The retaining device 46 is made of plastic.

[0069] In this example, the first pipe section 12 and the second pipe section 16 have an identical cross-section. Furthermore, the second pipe section 16 has a greater length than the first pipe section 12 (length of the pipe sections measured along the neutral fiber or pipe core).

[0070] A bracket 51, 52 is welded to each of the first pipe section 12 and the second pipe section 16, by means of which the fluid line 10 can be attached to a joining partner, e.g., a drive motor or its auxiliary unit. The brackets 51, 52 each have a through-hole. The bracket 51 on the first pipe section 12 is located near the free end 30 of the first pipe section 12, the end furthest from the corrugated hose 14 (adjacent to the compressed sections 32).

Claims

Patent claims 1. Method for producing a fluid line (10) comprising the following steps: a) providing a first pipe section (12), a corrugated hose (14), and a second pipe section (16), wherein the corrugated hose (14) and the pipe sections (12, 16) are arranged in alignment one behind the other along a longitudinal axis (L), and the corrugated hose (14) is positioned between the two pipe sections (12, 16); and b) welding the corrugated hose (14) to the two pipe sections (12, 16), wherein the corrugated hose (14) is welded directly and circumferentially to the first pipe section (12) at a first end (18), wherein the corrugated hose (14) is welded directly and circumferentially to the second pipe section (16) at a second end (19); and wherein the welding of the first pipe section (12) and the second pipe section (16) with the corrugated hose (14) is started simultaneously.

2. Method according to claim 1, characterized in that the corrugated hose (14) having several solid waves (20) and the pipe sections (12, 16) are positioned one behind the other in step a) along the longitudinal axis (L) such that they overlap along the longitudinal axis (L) by less than one solid wave (20).

3. Method according to claim 1 or 2, characterized in that in step a) an annular fitting (26) is provided at the end (25) of the second pipe section (16) facing away from the corrugated hose (14), wherein in step b) during the welding of the corrugated hose (14) with the pipe sections (12, 16) simultaneously a welding of the ring fitting (26) to the second pipe section (16) is started.

4. Method according to one of the preceding claims, characterized in that the welding of the pipe sections (12, 16) to the corrugated hose (14) and / or the welding of the annular fitting (26) to the second pipe section (16) each by means of an orbital welding process .

5. Method according to claim 4, characterized in that the corrugated hose (14) and the pipe sections (12, 16) , preferably also the annular fitting (26) , are stationary with respect to the longitudinal axis (L) during welding and a welding device (100) performing the orbital welding process rotates around the longitudinal axis (L ).

6. Method according to one of the preceding claims, characterized in that the first pipe section (12) and the second pipe section (16) extend in a straight line along their central longitudinal axis before welding and / or during welding, wherein the first pipe section (12) and the second pipe section (16) are reshaped after welding.

7. Fluid line (10), in particular oil line, produced by a method according to one of the preceding claims.

8. Fluid line (10), in particular oil line, comprising a first pipe section (12), a corrugated hose (14) and a second pipe section (16), wherein the corrugated hose (14) and the pipe sections (12, 16) are arranged in alignment one behind the other along a longitudinal axis (L) and the corrugated hose (14) is positioned between the two pipe sections (12, 16), wherein the corrugated hose (14) is directly and circumferentially welded to the first pipe section (12) at a first end (18) and the corrugated hose (14) is directly and circumferentially welded to the second pipe section (16) at a second end (19).

9. Fluid line (10) according to claim 8, characterized in that the corrugated hose (14) has several solid shafts (20), each of which is formed from an inner shaft (20' ) and an outer shaft (20'' ) wherein the corrugated hose (14) has at both ends an outer shaft (20'' ) cut off at the apex (S), to which the corrugated hose (14) is welded to the first pipe section (12) and the second pipe section (16).

10. Fluid line (10) according to claim 8 or 9, characterized in that the first pipe section (12) has two spaced-apart compressed sections (32) at its end (30) facing away from the corrugated hose (14), in which the first pipe section (12) has enlarged outer dimensions, in particular a larger diameter, wherein the two compressed sections (32) accommodate an O-ring (34) between them.

11. Fluid line (10) according to one of claims 8 to 10, characterized in that at the end (25) of the second pipe section (16) facing away from the corrugated hose (14) a A ring fitting (26) is welded on, in which a hollow screw (36) is received.

12. Fluid line (10) according to claim 11, characterized in that a seal (40) has two interconnected sealing sections (41, 42), wherein the first sealing section (41) is arranged between the screw head of the hollow screw (36) and the annular section of the annular fitting (26), and wherein the second sealing section (42) engages the annular section of the annular fitting (26) on the side facing away from the screw head.

13. Fluid line (10) according to one of claims 8 to 12, characterized in that the first pipe section (12) and the second pipe section (16) have an identical cross-section and / or that the second pipe section (16) has a greater length than the first pipe section (12).

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