Device and method for welding at least one first metallic element onto a second metallic element

Abstract

TITLE. Welding Device. The invention relates to a welding device (1) for welding at least one first metal element (2) onto a second metal element (3). This welding device (1) comprises at least one frame (4), at least one laser welding means (5; 5'), and at least one means for attaching said at least one laser welding means (5; 5') to the frame (4). This welding device (1) is characterized in that it further comprises pressure means (7) configured to exert pressure on said at least one first metal element (2) and in the direction of the second metal element (3), such that said at least one first metal element (2) bears against the second metal element (3), as well as means for mounting these pressure means (7) on the frame (4). Figure for the abstract: Fig. 4

Description

Title of the invention: Device and method for welding at least one first metallic element to a second metallic element

[0001] The present invention relates to a device for welding at least one first metallic element to a second metallic element and to a method for welding at least one such first metallic element to such a second metallic element. The invention also relates to a welding installation for welding at least one such first metallic element to such a second metallic element.

[0002] This invention relates to the field of welding one metallic element to another metallic element, more particularly, the field of welding one metallic element to another magnetic metallic element.

[0003] Without being limited to it, the present invention will find a particularly suitable application when it comes to manufacturing a high-power electrical device which comprises, on the one hand, a plurality of stacked parallel magnetic metal plates and, on the other hand, a plurality of metal spacers, interposed between two of these adjacent magnetic metal plates, and welded onto one of these magnetic metal plates.

[0004] Various types of welding processes are already known which allow a first metallic element to be welded onto a second metallic element.

[0005] Among these welding processes, a first type of welding consists of spot welding, also called resistance welding.

[0006] This first type of welding has many disadvantages.

[0007] First, it should be noted that this first type of welding requires a high energy input, which increases the cost of this type of welding. Furthermore, when a component to be welded has a thin wall thickness, such an energy input can cause deformation of the component.

[0008] Another disadvantage is that this first type of welding is not optimal when it comes to welding two metallic elements that are made of two different metallic materials, such as a first element in stainless steel and a second element in magnetic steel.

[0009] Another drawback arises from the fact that this first type of welding requires the passage of current through the element to be welded. When such an element has a non-constant cross-section, this first type of welding is difficult to control and often results in an imperfect, or even fragile, weld.

[0010] Moreover, when performing a weld according to this first type of weld on one side of a thin metal element, it is common that, on the opposite side of this metal element, there appears an excess thickness at the weld point (especially around this weld point) which impairs the flatness of this metal element and may require machining of the surface of this metal element.

[0011] In addition, when the first metal element and / or the second metal element is covered by a layer of varnish (in particular an insulating varnish), it is necessary, prior to the welding operation, to remove the layer of varnish, which results in a lengthening of the welding time and an increase in the cost of welding.

[0012] To remedy some of the disadvantages of this first type of welding, a second type of welding has been devised which consists of welding by a laser beam, usually called laser welding.

[0013] This second type of welding also presents a number of disadvantages.

[0014] In fact, this second type of welding usually consists of performing a weld by transparency, that is to say, through one of the metallic elements, more particularly through the thinnest metallic element.

[0015] A first drawback, then, is that such welding requires ensuring perfect contact between the elements to be assembled, as close as possible to the laser beam.

[0016] Another disadvantage is that the laser beam has to pass through the thickness of one of the metallic elements before fusing with the other metallic element, which produces significant heating.

[0017] Moreover, this significant heating is likely to cause significant deformations to at least one of the metallic elements, particularly at the weld.

[0018] Finally, this second type of welding consists of welding from the rear face of one of the metal elements, the front face of which receives the other metal element. This welding process often results in the formation of excess material (particularly in the form of a swath) on the rear face (especially at the weld point), which impairs the flatness of this metal element and necessitates machining of its surface.

[0019] The present invention is intended to remedy, at least in part, the drawbacks of prior art welding processes.

[0020] To this end, the invention relates to a welding device for at least one first metallic element onto a second metallic element. This welding device comprises, on the one hand, at least one frame and, on the other hand, at least one laser welding means and at least one means for attaching said at least one laser welding means to the frame. This welding device is characterized in that it also comprises, on the one hand, pressure means configured to exert pressure on said at least one first metallic element and in the direction of the second metallic element, so that said at least a first metallic element bears against the second metallic element and, on the other hand, on the other hand, means of mounting these pressure means on the chassis.

[0021] According to another feature, the welding device includes gripping means which are configured to grasp said at least one first metal element for the purpose of depositing it on the second metal element.

[0022] Yet another characteristic relates to the fact that the welding device includes air extraction means, which are fitted to the chassis, and which are configured to extract welding fumes and / or to ensure cooling of the welding device.

[0023] The invention also relates to a welding installation for at least one first metal element onto a second metal element. This welding installation comprises, on the one hand, a support on which the second metal element is placed, and, on the other hand, a welding device for said at least one first metal element onto the second metal element. This installation is characterized in that, on the one hand, the welding device has the characteristics described above and, on the other hand, the support is at least partially made of a material that has high thermal conductivity.

[0024] The invention also relates to a method for welding at least one first metal element onto a second metal element. This welding method comprises, on the one hand, a support step which consists of applying pressure to said at least one first metal element in the direction of the second metal element, so that said at least one first metal element bears against the second metal element and, on the other hand, a welding step which consists of laser welding said at least one first metal element onto the second metal element, while said at least one first metal element is held in contact with the second metal element.

[0025] According to another feature, the second metal element has, on the one hand, a rear face intended to rest on a support, and on the other hand, a front face, which is opposite the rear face, and against which said at least one first metal element rests. The welding process then comprises, prior to the welding step, a positioning step during which at least one welding tool is positioned on the front face of the second metal element, near this front face and near said at least one first metal element, the welding step then being carried out on the front face of the second metal element.

[0026] Another characteristic relates to the fact that, prior to the support step and the welding step, the welding process includes a deposition step which consists of to place the second metallic element on a support which is at least partly made of a material which has high thermal conductivity.

[0027] Finally, the invention relates to a method of manufacturing a high-power electrical device which comprises, on the one hand, a plurality of stacked parallel magnetic metal plates and, on the other hand, a plurality of metal spacers, which are interposed between two adjacent magnetic metal plates among the plurality of magnetic metal plates, and which are welded to at least one of the two adjacent magnetic metal plates among the plurality of magnetic metal plates.This manufacturing process is characterized by the fact that it comprises a welding process, which has the characteristics described above, and in which, on the one hand, the second metallic element is constituted by a magnetic metallic plate from among the plurality of magnetic metallic plates and, on the other hand, said at least one first metallic element is constituted by at least one metallic spacer from among the plurality of metallic spacers.

[0028] Thus, the welding device includes pressure means configured to exert pressure on said at least one first metal element and in the direction of the second metal element, so that said at least one first metal element bears against the second metal element. Concurrently, the welding process includes a support step consisting of exerting pressure on said at least one first metal element and in the direction of the second metal element, so that said at least one first metal element bears against the second metal element.

[0029] These pressure means and / or this support step advantageously make it possible to ensure that said at least one first metallic element takes support against the second metallic element, which makes it possible to ensure perfect contact between the elements to be welded and significantly improves the quality of the welding of these elements.

[0030] In addition, the welding process includes, prior to the welding step, a positioning step during which at least one welding tool is positioned on the front face of the second metal element, close to this front face and to at least one first metal element. Advantageously, such positioning prevents the formation of excess thickness on the back face of the second metal element, thereby preserving the flatness of this second metal element and eliminating the need for machining its surface.

[0031] Other objects and advantages of the present invention will become apparent during the following description relating to embodiments which are given only by way of indicative and non-limiting examples.

[0032] Understanding this description will be facilitated by referring to the drawings attached in the appendix, in which:

[0033] [Fig-1] represents a schematic and perspective view of a welding device in accordance with the invention.

[0034] [Fig.2] represents a schematic and side view of the welding device illustrated [Fig.1].

[0035] [Fig.3] represents a schematic, side and longitudinal sectional view along AA of the welding device illustrated in figures 1 and 2.

[0036] [Fig.4] represents a schematic and front view of the welding device illustrated in figures 1 to 3.

[0037] [Fig.5] represents a schematic, front and cross-sectional view along BB of the welding device illustrated in figures 1 to 4.

[0038] The invention relates to the field of welding one metallic element to another metallic element, more particularly, the field of welding one metallic element to another magnetic metallic element.

[0039] The invention relates, then, to a welding device 1 of at least a first metallic element 2 on a second metallic element 3.

[0040] This welding device 1 comprises at least one chassis 4 which is configured to be made integral with a displacement system, which is configured to ensure the displacement of said chassis 4 (and, therefore, of the welding device 1) along at least three axes, and which may be of the motorized and / or robotic type, in particular in the form of a multi-axis robot with an articulated arm.

[0041] Such a chassis 4 comprises a first side 40 and a second side 40', this first side 40 and this second side 40' being symmetrical with respect to a median plane along which the chassis 4 extends.

[0042] According to another feature, this chassis 4 comprises, on the one hand, a first part 41 of chassis 4 which is configured to be made fixed to a movement system as mentioned above, on the other hand, a second part 42 of chassis 4 which is movable relative to the first part 41 of chassis 4, on the other hand still, means for mounting in movement 43 (more particularly in translation along a direction parallel to the median plane along which the chassis 4 extends) of the second part 42 of chassis 4 relative to the first part 41 of chassis 4 and, on the other hand still, means for driving in movement 44 of the second part 42 of chassis 4 relative to the first part 41 of chassis 4.

[0043] This welding device 1 further comprises at least one laser welding means (5; 5') as well as at least one fixing means (6; 6') for said at least one laser welding means (5; 5') on the chassis 4, more particularly on the second part 42 of this chassis 4.

[0044] According to a preferred embodiment illustrated in the figures in the appendix, this welding device 1 comprises, on the one hand, two laser welding means (5; 5'), on the other hand, a first fixing means 6 of a first laser welding means 5 among the two laser welding means (5; 5'), this on the first side 40 of the chassis 4 (which then comprises, more particularly, the second part 42 of chassis 4) and, on the other hand, a second fixing means 6' of a second laser welding means 5' among the two laser welding means (5; 5'), this on the second side 40' of the chassis 4 (which then also comprises, more particularly, the second part 42 of chassis 4).

[0045] As can be seen in the figures in the appendix, the first laser welding means 5 and the second laser welding means 5' are symmetrical with respect to the median plane along which the chassis 4 extends.

[0046] According to another feature, said at least one laser welding means (5; 5') comprises, each, a laser welding torch, more particularly is constituted each by such a laser welding torch.

[0047] Alternatively, said at least one laser welding means (5; 5') comprises, each, a fiber laser, more particularly is constituted each by such a fiber laser.

[0048] In this regard, it will be noted that such a laser welding method (5; 5') has a power output of between 1 and 1.5 kW (kilowatts). Such power advantageously allows, on the one hand, the avoidance of deformation of said at least one first metal element 2 and / or said second metal element 3, on the other hand, the welding of at least one first metal element 2 and a second metal element 3 which may be made of different metals or have different grades of the same metal (in particular different grades of steel), and, on the other hand, the welding of a thin metal element (2; 3) (in particular on the order of a few tenths of a millimeter) without causing degradation, or even (where applicable) sublimating varnish which covers at least part of the surface of such a metal element (2; 3).

[0049] According to the invention, the welding device 1 further comprises pressure means 7 which are configured to exert pressure on said at least one first metal element 2 and in the direction of the second metal element 3, so that said at least one first metal element 2 bears (more particularly firmly) against the second metal element 3.

[0050] These pressure means 7 comprise a pressure member 70 which is configured to exert pressure on said at least a first metallic element 2. Such a pressure member 70 may be in the form of a wheel (advantageously configured to roll on said at least a first metallic element 2), of a roller, a finger or similar.

[0051] The welding device 1 also includes means for mounting 8 of these pressure means 7 on the chassis 4, more particularly on the second part 42 of this chassis 4.

[0052] In this regard, it will be observed that, when said pressure member 70 takes the form of a wheel, these mounting means 8 of these pressure means 7 on the chassis 4 comprise (more particularly are constituted by) means for mounting said wheel in rotation on the chassis 4, more particularly on the second part 42 of this chassis 4.

[0053] As mentioned above, the chassis 4 comprises a first part 41 of chassis 4 as well as a second part 42 of chassis 4.

[0054] In this regard, it will be observed that it is, more particularly, on this second part 42 of chassis 4 that, on the one hand, said at least one laser welding means (5; 5') is fixed, more particularly by means of said at least one fixing means (6; 6') and, on the other hand, the pressure means 7 are mounted, more particularly by means of the mounting means 8.

[0055] The presence of the moving mounting means 43 and the moving drive means 44 of the second part 42 of the chassis 4 relative to the first part 41 of the chassis 41 then allows, advantageously (and, in particular, before or after having positioned the welding device 1 relative to said at least one first metal element 2 and / or relative to said second metal element 3), to adjust and manage the pressure exerted by the pressure means 7 on said at least one first metal element 2, this by means of economical means (in particular compared to adjustment and management means linked to a movement system as mentioned above), easy to implement, and allowing fine adjustment and fine management of this pressure exerted.

[0056] Another feature relates to the fact that the welding device 1 comprises, on the one hand, at least one side cover (9; 9'), which is configured to block at least one laser beam emitted by said at least one laser welding means (5; 5'), and which is positioned as close as possible to said at least one laser beam and, on the other hand, means for fixing (10; 10') said at least one side cover (9; 9') to the chassis 4, more particularly to the second part 42 of chassis 4 and / or to one of the sides (40; 40') of chassis 4.

[0057] The presence of such a lateral housing (9; 9') advantageously allows said at least one laser beam emitted by said at least one laser welding means (5; 5') to be confined within the welding device 1.

[0058] According to a preferred embodiment, the welding device 1 comprises two side covers (9; 9') which are each configured to block the laser beam emitted by one of the two laser welding means (5; 5') mentioned above. The fastening means (10; 10') are then configured to fix, on the one hand, a first side cover 9 of the two side covers (9; 9') on the first side 40 of the frame 4 (which, more particularly, comprises the second part 42 of the frame 4) and, on the other hand, a second side cover 9' of the two side covers (9; 9') on the second side 40' of the frame 4 (which, more particularly, comprises the second part 42 of the frame 4).

[0059] As regards the fastening means (10; 10'), these can take the form, on the one hand, of at least one orifice which said at least one side cover (9; 9') has and on the other hand, of at least one screw, which passes through such an orifice, and which cooperates with the chassis 4, more particularly with the second part 42 of chassis 4.

[0060] Another characteristic relates, then, to the fact that the welding device 1 includes means for adjusting the position of said at least one side cover (9; 9') relative to the chassis 4, more particularly relative to the second part 42 of chassis 4.

[0061] These adjustment means then advantageously allow the height of said at least one side casing (9; 9') to be adjusted relative to the second metal element 3, according to the height of said at least one first metal element 2. These adjustment means then allow the confinement of said at least one laser beam emitted by said at least one laser welding means (5; 5') to be optimized within the welding device 1.

[0062] In fact, such adjustment means may consist of said at least one orifice, which said at least one side casing (9, 9') has, and which has an oblong shape.

[0063] Another feature relates to the fact that the welding device 1 includes gripping means 11 which are configured to grasp said at least one first metal element 2 (more particularly in at least one referenced location), with a view to its placement on the second metal element 3.

[0064] Such gripping means 11 may adopt the form of a suction cup, a clamp or the like.

[0065] Yet another feature relates to the fact that the welding device 1 includes air extraction means 12, which are fitted to the chassis 4, and which are configured to extract welding fumes (or even sublimation fumes from a varnish which coats said at least a first metallic element 2 and / or said second metallic element 3) and / or to ensure cooling of the welding device 1.

[0066] The invention also relates to a welding installation of at least a first metallic element 2 on a second metallic element 3.

[0067] This welding installation comprises, on the one hand, a support on which the second metal element 3 is placed, and, on the other hand, a welding device 1 for welding said at least a first metal element 2 onto the second metal element 3.

[0068] According to the invention, the welding device 1 has the characteristics described above.

[0069] Also according to the invention, said support is at least partly made of a material that has high thermal conductivity. This characteristic advantageously allows for maximum absorption of the thermal energy emitted by the welding.

[0070] In fact, and according to a preferred embodiment, the support can be made up of a plate (more particularly flat) which incorporates copper, or which is made up at least in part (or even entirely) of copper.

[0071] The invention also relates to a method of welding at least one first metallic element 2 onto a second metallic element 3.

[0072] This welding process comprises, on the one hand, a support step which consists of applying pressure to said at least one first metal element 2 and in the direction of the second metal element 3, so that said at least one first metal element 2 bears (more particularly firmly) against the second metal element 3 and, on the other hand, a welding step which consists of laser welding said at least one first metal element 2 onto the second metal element 3, while said at least one first metal element 2 is held in support against the second metal element 3.

[0073] It will be noted that this welding process can, at least in part, be implemented by the welding device 1 described above.

[0074] It will also be observed that the second metal element 3 comprises, on the one hand, a rear face 30 which is intended to rest on a support (in particular such as mentioned above) and, on the other hand, a front face 31, which is opposite the rear face 30, which is oriented in the direction of said at least one first metal element 2, and against which said at least one first metal element 2 rests.

[0075] The welding process then includes, prior to the welding step, a positioning step during which at least one laser welding means (5; 5') is positioned on the side of the front face 31 of the second metal element 3, this in the vicinity of this front face 31 as well as in the vicinity of said at least one first metal element 2, more particularly in the vicinity of at least one lateral face (20; 20') which comprises said at least one first metal element 2. The welding step is then carried out on the front face 31 side of the second metal element 3.

[0076] This feature advantageously avoids any deformation and / or any excess thickness at the rear face 30 of the second metallic element 3.

[0077] Preferably, this welding process then comprises, prior to the welding step, a positioning step during which, on the one hand, a first laser welding means 5 is positioned on the side of the front face 31 of the second metal element 3, this in the vicinity of this front face 31 as well as in the vicinity of said at least one first metal element 2, more particularly in the vicinity of a first lateral face 20 comprising said at least one first metal element 2 and, on the other hand, a second laser welding means 5' is positioned on the side of the front face 31 of the second metal element 3, this in the vicinity of this front face 31 as well as in the vicinity of said at least one first metal element 2, more particularly in the vicinity of a second lateral face 20', comprising said at least one first metal element 2, and which is opposite the first lateral face 20,or which is symmetrical to this first lateral face 20 with respect to a median plane along which said at least one metal element 2 extends. The welding step is then carried out on the side of the front face 31 of the second metal element 3, on both sides of said at least one first metal element 2.

[0078] According to another feature of this welding process, the support step is carried out simultaneously with the positioning step of said at least one laser welding means (5; 5').

[0079] Said at least one laser welding means (5; 5') has the characteristics described above.

[0080] According to another feature, said at least a first metal element 2 also has a bearing face 21 which is configured to bear against the second metal element 3, more particularly against the front face 31 of this second metal element 3.

[0081] In this case, the first lateral face 20 and the second lateral face 20' of said at least one metallic element 2 extend from the bearing face 21

[0082] The welding step then consists of welding, on the second metal element 3 (more particularly on the front face 31 of this second metal element 3), the bearing face 21 and / or at least the first lateral face 20 and / or at least the second lateral face 20' of said at least a first metal element 2.

[0083] As mentioned above, the first lateral face 20 and the second lateral face 20' of said at least one metallic element 2 are symmetrical with respect to a median plane along which said at least one first metallic element 2 extends.

[0084] The welding step then consists of welding the first lateral face 20 and the second lateral face 20' of said at least one metal element 2 onto the second metal element 3, either symmetrically or offset from said median plane.

[0085] Another characteristic of the welding process is that, prior to the support step and the welding step, the welding process includes a deposition step which consists of depositing the second metallic element 3 onto a support which is at least partly made of a material which has high thermal conductivity, more particularly a support which has the characteristics described above.

[0086] Yet another characteristic consists in that, on the one hand, the second metallic element 3 is constituted by a magnetic plate (more particularly in the form of a flat sheet made of a magnetic material), on the other hand, said at least a first metallic element 2 is constituted by a spacer (more particularly in the form of a profile) which is intended to be positioned and welded on said magnetic plate which constitutes the second metallic element 3 as well as to be interposed between said magnetic plate which constitutes the second metallic element 3 and another metallic element which is constituted by another magnetic plate (more particularly in the form of a flat sheet made of a magnetic material) which is parallel to said magnetic plate which constitutes the second metallic element 3.

[0087] Finally, the invention relates to a method of manufacturing a high-power electrical device (more particularly a motor, a generator or the like).

[0088] Such an electrical device comprises, on the one hand, a plurality of parallel stacked magnetic metal plates (more particularly in the form of a plurality of flat sheets) and, on the other hand, a plurality of spacers (more particularly in the form of a plurality of metal profiles), which are interposed between two adjacent magnetic metal plates from among the plurality of magnetic metal plates, and which are welded to at least one of the two adjacent magnetic metal plates from among the plurality of magnetic metal plates.

[0089] This manufacturing process includes a welding process, which has the characteristics described above, and in which, on the one hand, the second metallic element 3 consists of a magnetic metallic plate (in particular a flat sheet) from among the plurality of magnetic metallic plates and, on the other hand, said at least a first metallic element 2 consists of at least one metallic spacer (in particular in the form of at least one metallic profile) from among the plurality of metallic spacers.

[0090] It will be observed that said at least one metallic spacer (which constitutes said at least one first metallic element 2) is then intended to be positioned and welded onto said magnetic metallic plate (which constitutes the second metallic element 3), more particularly on the front face of this magnetic metallic plate (more particularly on the front face 31 of said second metallic element 3).

[0091] Said at least one metallic spacer is also intended to be interposed between said magnetic metallic plate (which constitutes the second metallic element 3) and another magnetic metallic plate (which constitutes another metallic element) among the plurality of magnetic metallic plates which is parallel to said magnetic plate (which constitutes the second metallic element 3).

Claims

Demands

1. Welding device (1) of at least a first metal element (2) on a second metal element (3), this welding device (1) comprises: - at least one frame (4); - at least one laser welding means (5; 5') as well as at least one fixing means (6; 6') of said at least one laser welding means (5; 5') on the frame (4); - characterized in that it further comprises, on the one hand, pressure means (7) which are configured to exert pressure on said at least one first metal element (2) and in the direction of the second metal element (3), so that said at least one first metal element (2) bears against the second metal element (3) and, on the other hand, mounting means (8) of these pressure means (7) on the frame (4).

2. Welding device (1) according to claim 1, characterized in that it comprises, on the one hand, two laser welding means (5; 5'), on the other hand, a first fixing means (6) of a first laser welding means (5) from among the two laser welding means (5; 5'), this on a first side (40) of the chassis (4) and, on the other hand, a second fixing means (6') of a second laser welding means (5') from among the two laser welding means (5; 5'), this on a second side (40') of the chassis (4).

3. Welding device (1) according to any one of claims 1 or 2, characterized in that said at least one laser welding means (5; 5') each comprises a laser welding torch or a fiber laser.

4. Welding device (1) according to any one of the preceding claims, characterized in that, on the one hand, the pressure means (7) comprise a pressure member (70) which adopts the form of a wheel and, on the other hand, the mounting means (8) of these pressure means (7) on the frame (4) comprise means for rotating the wheel on the frame (4).

5. Welding device (1) according to any one of the preceding claims, characterized in that the frame (4) comprises, on the one hand, a first part (41) of the frame (4) which is configured to be made integral with a displacement system which is configured to ensure the movement of the chassis (4), on the other hand, a second part (42) of chassis (4), which is movable relative to the first part (41) of chassis (4), and on which said at least one laser welding means (5; 5') is fixed and on which the pressure means (7) are mounted, on the other hand again, means for mounting in movement (43) of the second part (42) of chassis (4) relative to the first part (41) of chassis (4) and, on the other hand again, means for driving in movement (44) of the second part (42) of chassis (4) relative to the first part (41) of chassis (4).

6. Welding device (1) according to any one of the preceding claims, characterized in that it comprises, on the one hand, at least one side cover (9; 9'), which is configured to block at least one laser beam emitted by said at least one laser welding means (5; 5'), and which is positioned as close as possible to said at least one laser beam and, on the other hand, means for fixing (10; 10') said at least one side cover (9; 9') to the frame (4).

7. Welding device (1) according to claim 6, characterized in that it comprises means for adjusting the position of said at least one side cover (9; 9') relative to the chassis (4).

8. Welding device (1) according to any one of the preceding claims, characterized in that it comprises gripping means (11) which are configured to grasp said at least one first metal element (2) for the purpose of depositing it on the second metal element (3).

9. Welding device (1) according to any one of the preceding claims, characterized in that it comprises air extraction means (12), which are fitted to the frame (4), and which are configured to extract welding fumes and / or to provide cooling of the welding device (1).

10. A welding installation for at least one first metal element (2) onto a second metal element (3), this welding installation comprising, on the one hand, a support on which the second metal element (3) is placed, and, on the other hand, a welding device (1) for said at least one first metal element (2) onto the second metal element (3), characterized in that, on the one hand, the welding device (1) conforms to any one of the preceding claims and, on the other hand, the support is at least made of part made up of a material which has high thermal conductivity.

11. Welding installation according to claim 10, characterized in that the support is made up of a plate which incorporates copper.

12. A welding method of at least one first metal element (2) on a second metal element (3), this welding method comprises, on the one hand, a support step which consists of applying pressure on said at least one first metal element (2) and in the direction of the second metal element (3), so that said at least one first metal element (2) bears against the second metal element (3) and, on the other hand, a welding step which consists of laser welding said at least one first metal element (2) onto the second metal element (3), while said at least one first metal element (2) is held in support against the second metal element (3).

13. A welding method according to claim 12, characterized in that the second metal element (3) has, on the one hand, a rear face (30) intended to rest on a support, on the other hand, a front face (31), which is opposite the rear face (30), which is oriented towards said at least one first metal element (2), and against which said at least one first metal element (2) rests, while the welding method comprises, prior to the welding step, a positioning step during which at least one laser welding means (5; 5') is positioned on the side of the front face (31) of the second metal element (3), this in the vicinity of this front face (31) as well as in the vicinity of said at least one first metal element (2), the welding step then being carried out on the side of the front face (31) of the second metal element (3).

14. A welding method according to any one of claims 12 or 13, characterized in that said at least one first metal element (2) has, on the one hand, a bearing face (21) configured to bear against the second metal element (3), on the other hand, a first lateral face (20) extending from the bearing face (21), and on the other hand, a second lateral face (20') extending from the bearing face (21), while the welding step consists of welding, on the second element metallic (3), the bearing face (21) and / or at least the first lateral face (20) and / or at least the second lateral face (20') of said at least one first metallic element (2).

15. A welding method according to claim 14, characterized in that, on the one hand, the first lateral face (20) and the second lateral face (20') of said at least one metal element (2) are symmetrical with respect to a median plane along which said at least one first metal element (2) extends and, on the other hand, the welding step consists of welding the first lateral face (20) and the second lateral face (20') of said at least one metal element (2) onto the second metal element (3), this in a symmetrical or offset manner with respect to said median plane.

16. A welding process according to any one of claims 12 to 15, characterized in that, prior to the support step and the welding step, the welding process includes a deposition step which consists of depositing the second metallic element (3) onto a support which is at least partly made of a material which has high thermal conductivity.

17. A welding method according to any one of claims 12 to 16, characterized in that, on the one hand, the second metal element (3) is constituted by a magnetic plate, on the other hand, said at least a first metal element (2) is constituted by a spacer which is intended to be positioned and welded on said magnetic plate which constitutes the second metal element (3) and to be interposed between said magnetic plate which constitutes the second metal element (3) and another metal element which is constituted by another magnetic plate which is parallel to said magnetic plate which constitutes the second metal element (3).

18. A method for manufacturing a high-power electrical device comprising, on the one hand, a plurality of stacked parallel magnetic metal plates and, on the other hand, a plurality of metal spacers interposed between two adjacent magnetic metal plates from among the plurality of magnetic metal plates, and welded to at least one of the two adjacent magnetic metal plates from among the plurality of magnetic metal plates, characterized in that the manufacturing process includes a welding process, which conforms to any one of claims 12 to 17, and in which, on the one hand, the second metal element (3) is constituted by a magnetic metal plate from among the plurality of magnetic metal plates and, on the other hand, said at least a first metal element (2) is constituted by at least one metal spacer from among the plurality of metal spacers.

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