System for assembling indexed peel test specimens by welding onto electrodes and method for assembling indexed peel test specimens by welding onto electrodes.

Abstract

The invention relates to a system for assembling indexed peel test specimens by welding onto electrodes, comprising a first electrode (20a) and a second electrode (20b), at least one first test specimen (22) and a second test specimen (23), each test specimen having an L-shape comprising a large bar and a small bar, each test specimen is positioned opposite each other and touches by the small bar of the L. The system comprises a first test specimen holder (24a) having a first through hole for the passage of the large bar of the first test specimen (22), and a second through hole for guiding the assembly, a second test specimen holder (24b) having a through hole for the passage of the large bar of the second test specimen (23), and a second through hole for guiding the assembly, each test specimen holder having a third hole for the passage of the first electrode (20a) or the second electrode (20b).Figure for the abridged version: Fig. 6.

Description

Title of the invention: System for welding indexed peel test specimens onto electrodes and method for welding indexed peel test specimens onto electrodes. Technical field of the invention

[0001] The present invention relates to a system for assembling indexed peel test specimens onto electrodes by welding and a method for assembling indexed peel test specimens onto electrodes by welding. It is particularly applicable to peel tensile testing.

[0002] The peel tensile test, also called the peel test or detachment test, is a method used to evaluate the resistance of an assembly to separation or detachment under the effect of an applied tensile force. This method is commonly used in industry to test the quality and strength of adhesive joints or mechanical assemblies.

[0003] In a peel tensile test, two substrates or materials are generally bonded, welded, or fixed together in a specific manner. Then, a tensile force is applied in a controlled and progressive manner to attempt to separate the two materials. This force is generally applied in a direction perpendicular to the surface of the assembly, which exerts tension on the bonded area.

[0004] The results of the peel tensile test provide valuable information on the strength of the assembly, including its breaking strength and adhesion. This data is essential for evaluating the quality of the materials used, the assembly method, and for ensuring compliance with the standards and specifications required in various industrial applications. Previous technique

[0005] As part of our various series of tests aimed at validating Pions assemblies in multi-material configurations, it is essential to perform peel tests to evaluate the strength of these assemblies, while ensuring the reproducibility of the results. However, it has been found that no suitable means are available to perform this type of test. The use of hand-held vise grips to hold the test specimen components raises concerns in terms of safety and ergonomics, and does not allow for precise alignment of the two coupons, thus compromising the reliability of the test results.

[0006] Currently, the welding clamp is mounted on a robot. However, the mounting device designed to position the test pieces to be welded does not allow for the production of peel test pieces. There is no suitable mounting for creating peel test pieces using a welding clamp. Although solutions exist for assembling this type of test piece using adhesive, none are suitable for welding. In this case, it is difficult to correctly align the two face-to-face sections to ensure effective welding that meets specific requirements.

[0007] An example of a prior art embodiment of such a device is shown in [Fig.1].

[0008] Fig. 1 represents a first electrode 20a, a pin 21 to be welded positioned on an aluminum part, a steel 23 and a second electrode 20b.

[0009] The aluminum test specimen 23 (first test specimen) and the steel test specimen 24 (second test specimen) are L-shaped. The smaller bar of the L is to be welded to the other smaller bar. This is also a coupon. The pin 21 is positioned in a through hole in the aluminum test specimen 22.

[0010] The main objective is to achieve automated welding of the test pieces, thus eliminating any manual intervention once the coupons have been positioned on each electrode of the welding clamp and precisely aligned on the axis of the pins to be welded. Presentation of the invention

[0011] The present invention aims to remedy these drawbacks with a completely innovative approach.

[0012] More specifically, the invention aims to provide a technique ensuring reliability in the repetition of welding two test pieces.

[0013] These objectives, as well as others that will appear subsequently, are achieved, according to a first aspect, by means of a system for assembling peel test specimens indexed on electrodes by welding, comprising a first electrode and a second electrode, at least one first test specimen and a second test specimen. Each test specimen has an L-shape comprising a large bar and a small bar, each test specimen is positioned opposite the other and touches by the small bar of the L, notable in that said system comprises a first test specimen holder having a first through hole for the passage of the large bar of the first test specimen, and a second through hole for guiding the assembly; a second test specimen holder having a through hole for the passage of the large bar of the second test specimen, and a second through hole for guiding the assembly.Each test specimen holder has a third hole for the passage of the first or second electrode.

[0014] Thanks to the test specimen supports, the alignment of the two metal test specimens during the welding phase is ensured automatically.

[0015] Each specimen holder allows for thickness adjustment. These specimen holders, while maintaining the specimens in perfect alignment, will not impede the movement of the electrodes during the welding phase. These holders will play a crucial role in the precise alignment of the two specimens, an essential step to ensure their optimal positioning in the jaws during peel tensile tests.

[0016] Thus, this arrangement not only automates the welding process of the test specimens, but also ensures the consistency and reliability of the results of subsequent peel tensile tests.

[0017] By eliminating any intervention near the electrodes during the welding phase, this solution considerably reduces the risks of accidents related to the manual handling of parts during the process.

[0018] The automatic guidance of the test specimens vertically and parallel to each other during the movement of the electrodes ensures maximum consistency in the position of the parts during each weld. This ensures reproducibility of the results from one test to another, allowing for reliable analysis of the performance of the assemblies.

[0019] Manual implementation without the use of complex tools simplifies the welding process and makes it more accessible to operators. This simplicity contributes to improved operational efficiency and significant time savings when performing assembly tests.

[0020] The invention is advantageously implemented according to the embodiments and variants set out below, which are to be considered individually or according to any technically operative combination.

[0021] In one embodiment, the first or second test specimen has a circular hole.

[0022] In one embodiment, the circular hole includes a weld pin. A pin has previously been inserted into the base of the "L" shape of one of the two test pieces. The pin is automatically centered on the axis of the electrodes, thus ensuring precise and uniform positioning of the parts to be welded with each cycle. This precision contributes to the quality and strength of the assemblies produced.

[0023] In one embodiment, the first test specimen holder and the second test specimen holder are identical. Thus, precise alignment of the electrodes is guaranteed.

[0024] In one embodiment, a guide rail is inserted into the second guide through hole of the assembly.

[0025] In one embodiment, the dimensions of the first through hole or the second through hole for guiding the assembly are greater than dimensions of the large bar of the first test specimen and are between 5% and 15% of the dimensions of the large bar of the first test specimen.

[0026] In one embodiment, the material of the first test specimen support or the second test specimen support is made of bakelite.

[0027] During use, bakelite is chosen as the material for the test specimen support. This material is selected for its resistance to the heat generated during the welding phase. This robustness ensures increased durability and reliability of the device under demanding working conditions.

[0028] In one embodiment, the first electrode or the second electrode is electrically powered to weld the first test specimen to the second test specimen.

[0029] According to a second aspect, the present invention relates to a method for assembling indexed peel test specimens onto electrodes by welding and a system for assembling indexed peel test specimens onto electrodes by welding, remarkable in that it comprises the following steps: - a) place a first test specimen in a first test specimen holder and a second test specimen in a second test specimen holder; - b) position a first test tube opposite a second test tube; - c) weld the first test specimen to the second test specimen using a first electrode and a second electrode.

[0030] In one embodiment, during step c), the first electrode is fixed and the second electrode is mobile.

[0031] The advantages, purposes and particular characteristics of this method being similar to those of the system which is the subject of the present invention, they are not recalled here. Brief description of the figures

[0032] Other advantages, purposes and features of the present invention will become apparent from the following description, given for explanatory purposes only and not as a limitation, with reference to the accompanying drawings, in which:

[0033] Fig. 1 represents a prior art of welding a test specimen from electrodes;

[0034] Fig. 2 represents a perspective view of the assembly of two test specimens;

[0035] Figure 3 shows a perspective view of a first test tube with a first test tube support;

[0036] Fig. 4 represents a perspective view of a second test specimen with a second test specimen support;

[0037] Fig. 5 represents a side view of the assembly of two test specimens;

[0038] Figure 6 shows a perspective view before the assembly of two test tubes;

[0039] Fig. 7 represents a perspective view of the assembly of two test specimens by welding. Description of the implementation methods

[0040] The [Fig. 1] has already been described above.

[0041] Fig. 2 shows a perspective view of the assembly of two test specimens.

[0042] This figure shows a first test specimen 22 positioned next to a second test specimen 23. Each test specimen is L-shaped and comprises a long bar and a short bar. The short bars of each test specimen are joined to each other. The first test specimen has a weld pin inserted beforehand by a specific means.

[0043] Naturally, the invention is described above by way of example. It is understood that a person skilled in the art is able to carry out different embodiments of the invention without departing from its scope. This invention is particularly applicable to test pieces made of weldable materials without the use of weldable pins, as these are intended solely for joining coupons of non-weldable materials together.

[0044] Fig. 3 shows a perspective view of a first test specimen 22 with a first test specimen support 24a.

[0045] This figure shows a first test specimen 22 which is inserted onto a first test specimen holder. The first test specimen holder 24a also includes a guide rail 25.

[0046] The first test specimen support has a first through hole for the passage of the large bar of the first test specimen 22.

[0047] The first test specimen support 24a has a second through hole for guiding the assembly and allows the guide rail 25 to be inserted and guides the assembly during the welding phase.

[0048] Each test specimen holder has a third hole for the passage of the first or second electrode.

[0049] Fig. 4 shows a perspective view of a second test specimen 23 with a second test specimen support.

[0050] This figure shows a second test specimen 23 which is inserted onto a second test specimen holder. The second test specimen holder 24b also includes a guide rail 25.

[0051] The second test specimen support has a second through hole for the passage of the large bar of the second test specimen 23.

[0052] The second test specimen support 24b has a second through hole for guiding the assembly and allows the guide rail 25 to be inserted and guides the assembly during the welding phase.

[0053] Fig. 5 shows a side view of the assembly of two test specimens.

[0054] This figure shows the elements described above and allows a clear view of the guidance of the guide rail 25.

[0055] The first test tube 22 touches the second test tube 23 by means of its pin.

[0056] Fig. 6 shows a perspective view before the assembly of two test specimens.

[0057] This figure incorporates some of the elements described above.

[0058] The first electrode 20a and the second electrode 20b are visible.

[0059] The first test specimen support 24a is positioned at the top of the large bar of the first test specimen 22.

[0060] The first electrode 20a will descend and weld the first test piece 22 to the second test piece 23 by its pin 21.

[0061] Figure 7 shows a perspective view of the assembly of two test specimens by welding.

[0062] This figure incorporates some of the elements described above.

[0063] The first electrode 20a descends and welds the first test piece 22 to the second test piece 23 by passing the current through the pin 21 to the second electrode 20b which is fixed.

[0064] The first test tube support 24a and the second support now have a reduced distance due to the descent of the first electrode 20a.

[0065] It is emphasized that all features, as they are apparent to a person skilled in the art from the present description, drawings and attached features, even if in practice they have only been described in relation to other specific features, both individually and in any combinations, can be combined with other features or groups of features disclosed herein, provided that this has not been expressly excluded or that technical circumstances make such combinations impossible or meaningless. List of reference signs

[0066] [Tables 1] References Designations 20a First electrode 20b Second electrode 21 Pawn 22 First test specimen 23 Second test specimen 24a First test specimen holder 24b Second test specimen holder 25 Guide rail

Claims

Demands

1. A system for welding indexed peel test specimens onto electrodes, comprising a first electrode (20a) and a second electrode (20b), at least one first test specimen (22) and a second test specimen (23), each test specimen having an L-shape comprising a large bar and a small bar, each test specimen is positioned opposite each other and touches by the small bar of the L, characterized in that said system comprises a first test specimen holder (24a) having a first through hole for the passage of the large bar of the first test specimen (22), and a second through hole for guiding the assembly, a second test specimen holder (24b) having a through hole for the passage of the large bar of the second test specimen (23), and a second through hole for guiding the assembly,Each test specimen holder has a third hole for the passage of the first electrode (20a) or the second electrode (20b).

2. System according to claim 1, wherein the first test specimen (22) or the second test specimen (23) has a circular hole.

3. System according to claim 2, wherein the circular hole has a pin (21) to be welded.

4. System according to any one of claims 1 to 3, wherein the first specimen holder (24a) and the second specimen holder (24b) are identical.

5. System according to any one of claims 1 to 4, wherein a guide rail (25) is inserted into the second guide through hole of the assembly.

6. System according to any one of claims 1 to 5, wherein the dimensions of the first through hole or the second through hole for guiding the assembly are greater than the dimensions of the large bar of the first test piece (22) and are between 5% and 15% of the dimensions of the large bar of the first test piece (22).

7. System according to any one of claims 1 to 6, wherein the material of the first specimen holder (24a) or of the second specimen holder (24b) is made of bakelite.

8. A system according to any one of claims 1 to 7, wherein the first electrode (20a) or the second electrode (20b) is powered electrically to weld the first test specimen (22) to the second test specimen (23).

9. A method for assembling indexed peel test specimens onto electrodes by welding according to any one of claims 1 to 8, characterized in that it comprises the following steps: - a) placing a first test specimen (22) in a first test specimen holder (24a) and a second test specimen (23) in a second test specimen holder (24b); - b) positioning a first test specimen (22) opposite a second test specimen (23); - c) welding the first test specimen (22) to the second test specimen (23) using a first electrode (20a) and a second electrode (20b).

10. Method according to claim 9, wherein in step c), the first electrode (20a) is fixed and the second electrode (20b) is mobile.

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