Welding method and clamping device

Abstract

The invention discloses a welding method and a clamping device which are used for welding a fluid conducting device, the fluid conducting device is provided with at least two flow channel plates, and a connecting pipe or a connector and one of the flow channel plates are pre-positioned through laser welding; and the runner plate which is pre-positioned with the connecting pipe or the joint is welded with another runner plate and then is fed into a furnace for furnace welding. The clamping device comprises a tool table, a plate positioner and a laser gun, the abutting part is used for abutting against a to-be-welded part under the action of the action mechanism, and the supporting wall is used for positioning a connector or a connecting pipe. In the clamping device, the supporting wall only needs to be used for bearing the connecting pipe or the connector, the connecting pipe or the connector can penetrate through the mounting hole of the to-be-welded part, the connector or the connecting pipe and the to-be-welded part are provided with matching points and can be welded by a laser gun, and therefore the universality is good.

Description

Technical Field

[0001] The invention belongs to the field of welding technology, in particular to the welding technology and clamping device of a device with a flow channel structure. Background Art

[0002] There is a metal product formed by stacking more than two flow plates. The two flow plates are fixed by welding. After the adjacent flow plates are fixed, a flow channel can be formed between the adjacent flow plates. Since this metal product needs to weld adjacent flow plates, it is generally furnace welded in a welding furnace such as a vacuum furnace. During furnace welding, in order to ensure that the positions of more than two flow plates are determined, the products to be welded are clamped by a fixed tool, and then heated and welded in the furnace. This metal product needs to be connected in the system for use, so this metal product is generally welded with a joint for connection with the pipeline or non-pipeline in the system. It is difficult to clamp the joint on the flow plate by a tool, and the joint is generally initially positioned with the flow plate by riveting. During riveting, the joint needs to be expanded, and a special riveting tool that matches the product appearance is required. The design requirements of the riveting tool are high and the versatility of this riveting tool is poor. Therefore, if there are multiple products, multiple riveting tools are required, which increases the manufacturing cost. Summary of the invention

[0003] The purpose of the present invention is to provide a welding method and a clamping device with good versatility.

[0004] In order to achieve the above purpose, the following technical solutions are adopted:

[0005] A welding method for welding a fluid conducting device having at least two flow channel plates comprises the following steps:

[0006] Pre-position the pipe or joint with one of the flow channel plates by laser welding;

[0007] The flow channel plate pre-positioned with the connecting pipe or the joint and another flow channel plate are clamped and sent into the furnace for furnace welding.

[0008] The welding method first pre-positions the pipe or joint with one of the flow channel plates by laser welding, and then furnace welds the flow channel plate pre-positioned with the pipe or joint. The welding method adopts laser welding and furnace welding, has low requirements on tooling, reduces the demand for welding tooling, reduces riveting tooling, and reduces manufacturing costs.

[0009] In order to achieve the above purpose, the following technical solutions are also adopted:

[0010] A clamping device includes a tooling table, a plate positioner and a laser gun, wherein the tooling table has a supporting plane portion;

[0011] The plate positioner comprises an action mechanism and at least one abutment portion, the abutment portion and the action arm of the action mechanism are fixed or limited, the abutment portion is located on a first side of the support plane portion, the action arm of the action mechanism has at least a first position and a second position, in the first position, the abutment portion faces the support plane portion, and the distance between the abutment portion and the support plane portion is a first distance, in the second position, the distance between the abutment portion and the support plane portion is a second distance, and the first distance is smaller than the second distance;

[0012] The support plane portion has a through portion that penetrates the support plane portion in a height direction, and the clamping device has a support wall, and the support wall is used to support the peripheral wall portion or the end portion of the joint or the pipe;

[0013] The gun head of the laser gun faces the supporting plane portion.

[0014] The tooling table of this clamping device has a supporting plane portion for supporting the workpiece to be welded, the plate positioner has an action mechanism and at least one abutment portion, the action arm of the action mechanism has at least a first position and a second position, in the first position, the abutment portion faces the supporting plane portion, and the distance between the abutment portion and the supporting plane portion is the first distance, in the second position, the distance between the abutment portion and the supporting plane portion is the second distance, the first distance is smaller than the second distance, so that the abutment portion is used to abut against the workpiece to be welded under the action of the action mechanism, and is used for positioning the workpiece to be welded. The supporting plane portion has a through portion that penetrates the height direction of the supporting plane portion, and the pipe or joint portion can be accommodated in the through portion, the clamping device has a supporting wall, and the supporting wall is used to support the peripheral wall portion or the terminal portion of the joint or pipe, in the clamping device, the joint or pipe is supported by the supporting wall, and then laser welding is performed by a laser gun, which reduces the use of special riveting tooling, can be used for positioning a variety of workpieces to be welded, and for welding workpieces to be welded of various specifications, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of an implementation method of a clamping device;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the middle part;

[0017] Figure 3 for Figure 2 A structural diagram from another perspective;

[0018] Figure 4 for Figure 1 Schematic diagram of the structure of the middle tube positioner;

[0019] Figure 5 for Figure 4A schematic structural diagram of the tube positioner from another perspective;

[0020] Figure 6 for Figure 1 Schematic diagram of the structure of the action mechanism;

[0021] Figure 7 It is a partial structural schematic diagram of another embodiment of the clamping device;

[0022] Figure 8 A schematic structural diagram of another embodiment of the clamping device;

[0023] Fig. 9 The figure is a schematic structural diagram of another embodiment of the clamping device.

[0024] Among them, 1, workbench; 11, supporting plane portion; 12, first side; 13, second side; 14, through-portion; 15, limiting portion;

[0025] 2. Plate positioner; 21. Action mechanism; 211. Action arm; 22. Abutment portion;

[0026] 21a, flip mechanism; 23, locking assembly; 24, seat body; 21b, pressing mechanism; 25, positioning claw;

[0027] 3. Tube positioner; 31. Accommodating portion; 311. Support wall; 312. Groove bottom; 313. Groove side wall; 314. Platform portion; 315. Fixing hole; 316. Fixing piece; 32. Spring; 33. Spring cover plate; 34. Pillar; 35. Extension portion;

[0028] 4. Laser gun; 41. Gun tip. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the following is only for illustration and not for limiting the present invention.

[0030] A metal product formed by stacking two or more flow channel plates. The two flow channel plates are fixed by welding. After the adjacent flow channel plates are fixed, a flow channel can be formed between the adjacent flow channel plates. This metal product can be used for the conduction or distribution of refrigerant or other media in vehicles or other functions due to the flow channel inside.

[0031] When used as a flow channel for refrigerant in vehicles, due to the high pressure of the refrigerant, the connection requirements between the flow channel plates and the connectors are high. Therefore, welding is generally used to fix the connectors and flow channel plates. Different products have different structures of connectors or pipes. Therefore, for the welding of different connectors, many specific tooling is generally used for pre-positioning and clamping to facilitate welding. For example, many products will be riveted with riveting tooling, and then furnace welding will be performed. This type of riveting tooling is designed for specific products. Therefore, it cannot be used for different products. Therefore, different products currently require the use of various riveting tooling, so this method requires higher manufacturing costs in the past.

[0032] The present application is a welding method, which can be used for welding such metal products with more than two flow channel plates. The welding method of the present application is used for welding a fluid conducting device, and the fluid conducting device has at least two flow channel plates, and comprises the following steps:

[0033] Pre-position the pipe or joint with one of the flow channel plates by laser welding;

[0034] The flow channel plate pre-positioned with the pipe or joint is clamped with another flow channel plate and sent into the furnace for furnace welding.

[0035] Since the positions of the joints or pipes of different products may be different, and because the requirements of the riveting process have specific requirements for riveting tools, the welding tools for the joints or pipes will be different. The welding method of the present application is to pre-position the pipe or joint with one of the flow channel plates by laser welding, which requires a mechanism that can be used to support the pipe or joint so that the joint or pipe extends into the mounting hole of the flow channel plate. This mechanism is relatively simple and has relatively low requirements. This welding method reduces the specific riveting tools required for riveting the joint or pipe with the flow channel plate, improves the versatility of the tooling, and reduces the manufacturing cost.

[0036] Pre-positioning the nozzle or connector to one of the manifold plates by laser welding includes the following steps:

[0037] Put the welding piece on the pipe or joint;

[0038] Insert the pipe or connector into the mounting hole of one of the manifold plates;

[0039] The end portion of the butt-joint tube or the joint extending into the mounting hole is laser welded to the flow channel plate.

[0040] The welding piece is put on the pipe or joint, and the welding piece is used for end face welding and / or radial face welding between the pipe or joint and the flow channel plate during furnace welding.

[0041] In order to further improve the welding effect brought by the melting of the welding piece during the furnace welding process, the welding piece is put on the pipe or joint, and the pipe or joint is inserted into the mounting hole of one of the flow channel plates, so that the distance between the welding piece and the end face of the flow channel plate is within 0.2mm, and further the distance between the welding piece and the end face of the flow channel plate is within 0.15mm, for example, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm or less than 0.1mm. In this way, after subsequent furnace welding, the welding condition between the outer wall of the joint or pipe and the flow channel plate is good.

[0042] Furthermore, the connecting pipe or joint is inserted into the mounting hole of one of the flow channel plates so that the gap between the outer wall of the connecting pipe or joint and the hole wall corresponding to the mounting hole is no more than 0.3 mm, further, the gap between the outer wall of the connecting pipe or joint and the hole wall corresponding to the mounting hole is within 0.2 mm, further within 0.15 mm, for example, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm or less than 0.1 mm. Controlling the gap of the joint or joint within the above range in the mounting hole can improve the welding between the joint or connecting pipe and the flow channel plate, and the welding quality is good, with less occurrence of filamentous cold welds.

[0043] Laser welding the end of the butt tube or joint extending into the mounting hole to the flow channel plate includes the following steps:

[0044] Aim the light source of the laser gun at the end wall of the pipe or joint extending into the mounting hole and the hole wall corresponding to the mounting hole, and weld 2-3 places between the pipe or joint and the hole wall corresponding to the mounting hole in the circumferential direction. In general, the welding points can be controlled at 2-3 places, which can be used for pre-positioning of the pipe or joint. Of course, there can be multiple welding points, which depends on the actual product size. The purpose of laser welding is to pre-position, and the subsequent fixation between the two is achieved by furnace welding. Furnace welding uses vacuum furnace brazing, tunnel furnace brazing, etc.

[0045] As a specific implementation, the gun head of the laser gun is facing the hole wall corresponding to the connecting pipe or joint and the mounting hole from above, so that the light source of the laser gun falls between the hole wall corresponding to the connecting pipe or joint and the mounting hole. During welding, the connecting pipe or joint and the hole wall corresponding to the mounting hole are welded together.

[0046] This type of laser welding irradiates the pipe or joint vertically downward, so that the welding point is between the pipe or joint and the flow channel plate, so that some molten pools in the laser welding process can be on the end face of the pipe or joint, which is beneficial to the cleanliness of the flow channel inside the pipe or joint.

[0047] As another specific implementation, the gun head of the laser gun is obliquely facing the hole wall corresponding to the connecting pipe or connector and the mounting hole, and the light source of the laser gun irradiates from the center of the connecting pipe or connector to the hole wall corresponding to the connecting pipe or connector and the mounting hole.

[0048] This type of laser welding is to irradiate the pipe or joint at an angle, and irradiate from the center of the pipe or joint to the outside, so that the welding point is between the pipe or joint and the runner plate, and at the same time, the molten pool formed during the welding process flows toward the runner plate, which is beneficial to the cleanliness of the flow channel inside the pipe or joint.

[0049] The following describes a clamping device used in a welding method, which is used for clamping a joint or a pipe. This clamping device can be used for pre-positioning of a joint or a pipe, with reference to Figure 1-Figure 3 The clamping device includes a tooling table 1, a plate locator 2 and a laser gun 4. The tooling table 1 has a supporting plane portion 11; the plate locator 2 has an action mechanism 21 and at least one abutment portion 22, the abutment portion 22 and an action arm 211 of the action mechanism 21 are fixed or limited, the abutment portion 22 is located on the first side 12 of the supporting plane portion 11, and the action arm 211 of the action mechanism 21 has at least a first position and a second position. In the first position, the abutment portion 22 faces the supporting plane portion 11, and the distance between the abutment portion 22 and the supporting plane portion 11 is the first distance. In the second position, the distance between the abutment portion 22 and the supporting plane portion 11 is the second distance, and the first distance is smaller than the second distance; the supporting plane portion 11 has a penetrating portion 14 that penetrates the supporting plane portion 11 in the height direction, and the clamping device has a supporting wall 311, and the supporting wall is used to support the peripheral wall portion or the end portion of the joint or the connecting pipe; the gun head 41 of the laser gun 4 faces the supporting plane portion 11.

[0050] The clamping device includes a tube positioner 3 , which is located at the second side 13 of the support plane portion 11 . The tube positioner 3 has a support wall 311 at a position corresponding to the penetration portion 14 and facing the bottom of the support plane portion 11 .

[0051] The pipe positioner 3 has a receiving portion 31 , and the bottom of the receiving portion 31 has a supporting wall 311 at a position corresponding to the penetration portion 14 .

[0052] The tooling table 1 of the clamping device has a support plane portion 11 for supporting the workpiece to be welded, and the plate positioner 2 has an action mechanism 21 and at least one abutment portion 22. The action arm 211 of the action mechanism 21 has at least a first position and a second position. In the first position, the abutment portion 22 faces the support plane portion 11, and the distance between the abutment portion 22 and the support plane portion 11 is a first distance. In the second position, the distance between the abutment portion 22 and the support plane portion 11 is a second distance, and the first distance is smaller than the second distance. In this way, the abutment portion 22 is used to abut against the workpiece to be welded under the action of the action mechanism 21, and is used to position the workpiece to be welded. The pipe positioner 3 is located on the second side 13 of the support plane portion 11, and the pipe positioner 3 has a receiving portion 31. The support plane portion 11 has a through portion 14 that penetrates the height direction of the support plane portion 11. The receiving portion 31 has a supporting wall 311 at a position corresponding to the through portion 14. The through portion 14 is used to place a pipe or joint, and the supporting wall 311 is used to support the joint or pipe. In the clamping device, the tube positioner 3 only needs to be used to bear the pipe or joint, so that the pipe or joint can pass through the mounting hole of the part to be welded, and there is a matching point between the joint or pipe and the part to be welded, which can be welded by the laser gun 4. Therefore, the clamping device can be used to position universal parts to be welded and to weld parts to be welded of various specifications through the structure of the plate positioner 2 and the tube positioner 3.

[0053] Combined with reference Figure 2 and Figure 6 In this embodiment, the action mechanism 21 is a flipping mechanism 21a, and there are more than two flipping mechanisms 21a. Each flipping mechanism 21a has an abutment portion 22, an action arm 211, a locking assembly 23, and a seat body 24. The action arm 211 and the abutment portion 22 are limited or fixed, for example, by means of buckles or screws. The action arm 211 and the seat body 24 are hinged, and the action arm 211 can rotate relative to the seat body 24. The locking assembly 23 and the seat body 24 are limited, and the locking assembly 23 can be used to lock the position of the action arm 211, so that when the action arm 211 is in a position, the abutment portion 22 and the part to be welded are abutted. The locking assembly 23 can be manually locked or mechanically automatically locked. The seat body 24 can be fixed to the workbench 1, so that the fixation of the flipping mechanism 21a is relatively simple. The abutment portion 22 may be a structure with a soft material on the head, such as a soft pad of PA66 or other materials, which is used to protect the appearance of the welded parts when it abuts against the welded parts. Of course, the abutment portion 22 may also be a hard material, such as metal.

[0054] The flip mechanism 21a has a first position and a second position. In the first position, the abutting portion 22 faces the workbench 1 and is used to abut against the flow channel plate of the fluid conducting device. In the second position, there is a certain distance between the abutting portion 22 and the workbench 1, and there is a gap between the abutting portion 22 and the flow channel plate of the fluid conducting device. The action arm 211 of the flip mechanism 21a rotates at an angle of 90°, for example. In the first position, the action arm 211 is substantially parallel to the support plane portion 11 of the workbench 1, and in the second position, the action arm 211 is substantially perpendicular to the support plane portion 11 of the workbench 1. The action arm shown in the figure is in the first position, and in the second position, the action arm and the support plane portion 11 are at a substantially 90° angle.

[0055] In this embodiment, there are four turning mechanisms 21a shown in the figure, and the welding piece to be welded is limited by four positions. Of course, the number of turning mechanisms is not limited and can be determined according to actual conditions.

[0056] As an embodiment, the through portion 14 may be a through slot, and one side of the supporting plane portion 11 is opened to form the through slot, so that when placing the pipe or connector into the receiving portion 31, it can be directly placed from the side, which is easy to operate. Moreover, it is also convenient to place pipes or connectors of different sizes.

[0057] As another embodiment, the through portion 14 may also be a through hole. When assembling a joint or a pipe with this structure, the pipe or the joint can be inserted from the top, which is convenient for installation.

[0058] As other embodiments, there are multiple through-portions 14, and the multiple through-portions 14 can all be in the form of through slots, can all be in the form of through holes, or can be in the form of a combination of through slots and through holes. The combination of these structures is mainly determined according to the product and installation characteristics.

[0059] As an embodiment, there are two through-parts 14, that is, the welded parts need to weld joints or pipes at two locations. In this case, one embodiment is that there are three flipping mechanisms 21a, defined as a first flipping mechanism, a second flipping mechanism, and a third flipping mechanism, wherein the first flipping mechanism is located between the two through-parts 14, the second flipping mechanism is located on one side of the through-part 14, and the third flipping mechanism is located on the other side of the through-part 14. In this way, the three flipping mechanisms 21a can be used to facilitate the positioning of the welded parts near the two through-parts 14, which helps to accurately position them. Of course, there can also be two flipping mechanisms.

[0060] Reference Figure 3In order to further limit the position of the workpiece to be welded located on the supporting plane portion 11, the workbench 1 also has a limiting portion 15. The limiting portion 15 protrudes from the supporting plane portion 11 and can be used to limit one position or more than two positions of the workpiece to be welded to prevent it from shifting.

[0061] Reference Figure 4 and Figure 5 The tube positioner 3 has an accommodating portion 31, which includes a groove bottom 312, a groove side wall 313 and a platform portion 314. The supporting wall 311 may be a portion corresponding to the position of the groove bottom 312 and the through portion 14. The groove side wall 313 is integrally connected with the platform portion 314. The platform portion 314 and the supporting plane portion 11 are assembled. The platform portion 314 has a fixing hole 315. The platform portion 314 and the supporting plane portion 11 may be fixed, for example, by a fixing member 316 inserted into the fixing hole 315, such as a screw, a bolt, etc.

[0062] As an embodiment, in order to further improve the effectiveness of the matching between the joint or the pipe and the part to be welded, the pipe positioner 3 also has a spring 32, a spring cover 33 and a support 34. One end of the support 34 is fixed to the spring cover 33, such as by welding or bolts, and the other end of the support 34 is fixed to the bottom 312 of the groove, such as by welding or bolts. The spring 32 is limited between the spring cover 33 and the bottom 312 of the groove. In this embodiment, the supporting wall 311 is a portion corresponding to the position of the spring cover 33 and the through-portion 14. In this way, the joint or pipe can be located at the spring cover 33. Through the action of the spring 32, it can not only be used for the tight fit between the joint or pipe and the part to be welded, but also facilitates the accurate positioning and improves the welding accuracy during subsequent laser welding. Moreover, after the spring 32 is set, the length of the joint or pipe that matches the part to be welded can also have various forms, which can be applicable to various joints or pipes.

[0063] The clamping device can be used for welding a fluid conducting device, for example, a fluid conducting device having a flow channel plate and a pipe or joint, and the pipe or joint needs to be welded and fixed to the flow channel plate. The clamping device shown in this embodiment can be used to place the pipe or joint in the accommodating portion 31, place the flow channel plate on the workbench 1, and abut against the flow channel plate through the abutting portion 22 to achieve the positioning of the flow channel plate, and the pipe or joint is inserted into the mounting hole of the flow channel plate, and then the pipe or joint and the flow channel plate are laser welded by the laser gun 4.

[0064] Reference Figure 7 As another embodiment, the action mechanism 21 is, for example, a clamping mechanism 21b, which is connected to at least one positioning claw 25, and the positioning claw 25 has an abutment portion 22; the clamping mechanism 21b and the positioning claw 25 can be connected in a fixed or limiting manner.

[0065] The clamping mechanism 21 b has a driving component such as a motor or a cylinder, and the action arm 211 may be a driving shaft, and the abutting portion 22 moves under the action of the driving shaft.

[0066] The action arm 211 of the action mechanism 21 has at least a first position and a second position. In the first position, the abutting portion 22 faces the support plane portion 11, and the distance between the abutting portion 22 and the support plane portion 11 is the first distance. The positioning claw 25 faces the workbench 1 and the abutting portion 22 can abut against the flow channel plate of the fluid conducting device; in the second position, the distance between the abutting portion 22 and the support plane portion 11 is the second distance, the first distance is smaller than the second distance, and there is a gap between the abutting portion 22 and the flow channel plate of the fluid conducting device. In this way, the positioning of the welded parts placed on the support plane portion 11 can be achieved through the clamping mechanism 21b.

[0067] Furthermore, in order to better adapt to a variety of products, the action mechanism 21 may also include a moving module, such as a linear guide assembly or a ball screw assembly or a combination of two or more linear guide assemblies. The moving module can drive the action mechanism 21 to move relative to the support plane portion 11, so that it can adapt to positioning at different positions. In this way, the contact point of the positioning claw 25 with the workpiece to be welded can be adjusted by the moving module, and the position can be adjusted directly according to different products, which is more versatile.

[0068] As another embodiment, the number of the positioning claws 25 can be more than one, and the positioning effect is better by abutting against the workpiece to be welded at multiple points.

[0069] As other embodiments, refer to Figure 8 , Figure 8 The structure of another embodiment of the clamping device is schematically shown. The clamping device is used for clamping joints or pipes. This clamping device can be used for pre-positioning of joints or pipes. The clamping device includes a workbench 1, a plate positioner 2 and a laser gun 4. The workbench 1 has a supporting plane portion 11; the plate positioner 2 has an action mechanism 21 and at least one abutment portion 22. The abutment portion 22 and the action arm 211 of the action mechanism 21 are fixed or limited. The abutment portion 22 is located on the first side 12 of the supporting plane portion 11. The action arm 211 of the action mechanism 21 has at least a first side 12. a position and a second position, in the first position, the abutting portion 22 faces the supporting plane portion 11, and the distance between the abutting portion 22 and the supporting plane portion 11 is a first distance, in the second position, the distance between the abutting portion 22 and the supporting plane portion 11 is a second distance, and the first distance is smaller than the second distance; the supporting plane portion 11 has a penetrating portion 14 penetrating the supporting plane portion 11 in a height direction, the clamping device has a supporting wall 311, and the supporting wall is used to support the peripheral wall portion of the joint or the connecting pipe; the gun head 41 of the laser gun 4 faces the supporting plane portion 11.

[0070] The connecting pipe or connector can be limited by interference fit with the supporting wall 311. At least part of the supporting wall 311 is located at the wall portion corresponding to the penetrating part. When the connector or connecting pipe is inserted, it is supported by the wall portion corresponding to the penetrating part. In this case, the volume of the connector or connecting pipe is relatively small and there will not be a heavy load.

[0071] As another embodiment, the clamping device may further include a tube positioner 3, which is located on the second side 13 of the supporting plane portion 11. The tube positioner 3 may be a part of a workbench. For example, the workbench includes a planar supporting portion 11 and a tube positioner 3, which are integrally formed. The tube positioner protrudes relative to the planar supporting portion. In this way, the tube positioner has an extension portion of the penetrating portion, and at least a portion of the supporting wall is located on the wall portion corresponding to the extension portion. In this way, the joint or the connecting pipe can be positioned by the tube positioner.

[0072] Of course, as other embodiments, refer to Fig. 9 , Fig. 9 The structure of another embodiment of the clamping device is schematically shown. The clamping device is used for clamping joints or pipes. This clamping device can be used for pre-positioning of joints or pipes. The clamping device includes a workbench 1, a plate positioner 2 and a laser gun 4. The workbench 1 has a supporting plane portion 11; the plate positioner 2 has an action mechanism 21 and at least one abutment portion 22. The abutment portion 22 and the action arm 211 of the action mechanism 21 are fixed or limited. The abutment portion 22 is located on the first side 12 of the supporting plane portion 11. The action arm 211 of the action mechanism 21 has at least a first side 12. a position and a second position, in the first position, the abutting portion 22 faces the supporting plane portion 11, and the distance between the abutting portion 22 and the supporting plane portion 11 is a first distance, in the second position, the distance between the abutting portion 22 and the supporting plane portion 11 is a second distance, and the first distance is smaller than the second distance; the supporting plane portion 11 has a penetrating portion 14 penetrating the supporting plane portion 11 in a height direction, the clamping device has a supporting wall 311, and the supporting wall is used to support the peripheral wall portion of the joint or the connecting pipe; the gun head 41 of the laser gun 4 faces the supporting plane portion 11.

[0073] The pipe or joint can be limited by interference fit with the support wall 311, at least part of the support wall 311 is located at the wall corresponding to the penetration part, and when the joint or pipe is inserted, it is supported by the wall corresponding to the penetration part. The clamping device can also have a pipe positioner 3, the pipe positioner 3 is located at the second side 13 of the support plane part 11, the pipe positioner and the plane support part can also be two separate parts, the pipe positioner 3 protrudes relative to the plane support part 11, so that the pipe positioner 3 has an extension part 35 of the penetration part 14, the inner diameter of the extension part 35 can be less than or equal to the inner diameter of the penetration part 14, and at least part of the support wall 311 is located at the wall corresponding to the extension part 35. In this embodiment, the pipe positioner and the tooling table can be fixed by screws or other fixing methods, the pipe positioner can be used to support the pipe or joint, when the pipe has different sizes, the size of the penetration part can be suitable for a variety of pipes, and by replacing the pipe positioner, pipes or joints of different sizes can be positioned by interference fit of the wall corresponding to the extension part of the pipe positioner, and this clamping device has strong applicability.

[0074] It should be noted that the above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention, such as the directional definitions of "front", "back", "left", "right", "up" and "down". Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be combined, modified or replaced by each other, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A welding method for welding a fluid conducting device, wherein the fluid conducting device has at least two flow channel plates, characterized in that: The following steps are involved: Pre-position the pipe or joint with one of the flow channel plates by laser welding; The flow channel plate pre-positioned with the connecting pipe or the joint is clamped with another flow channel plate and then sent into a furnace for furnace welding.

2. The welding method according to claim 1, characterized in that: Pre-positioning the nozzle or connector to one of the flow plate by laser welding includes the following steps: Put the welding piece on the pipe or joint; Insert the pipe or connector into the mounting hole of one of the manifold plates; The end portion of the pipe or joint extending into the mounting hole is laser welded to the flow channel plate having the mounting hole.

3. The welding method according to claim 2, characterized in that: The following steps are involved: Put the welding piece on the pipe or joint, and insert the pipe or joint into the mounting hole of one of the flow channel plates, so that the distance between the welding piece and the end face of the flow channel plate facing the pipe or joint is within 0.2mm.

4. The welding method according to claim 1, 2 or 3, characterized in that: The method comprises the following steps: inserting a connecting pipe or a joint into a mounting hole of one of the flow channel plates, so that the gap between the outer wall of the connecting pipe or the joint and the hole wall corresponding to the mounting hole is within 0.3 mm.

5. The welding method according to claim 1, 2, 3 or 4, characterized in that: Laser welding the end of the butt pipe or joint extending into the mounting hole and the flow channel plate having the mounting hole comprises the following steps: Aim the light source of the laser gun at the tube or joint and extend it between the end wall of the mounting hole and the hole wall corresponding to the mounting hole, and weld the tube or joint to the hole wall corresponding to the mounting hole at 2-3 places in the circumferential direction.

6. The welding method according to claim 5, characterized in that: The following steps are involved: The gun head of the laser gun is facing the hole wall corresponding to the connecting pipe or joint and the mounting hole from above, so that the light source of the laser gun is irradiated between the hole wall corresponding to the connecting pipe or joint and the mounting hole. During welding, the connecting pipe or joint and the hole wall corresponding to the mounting hole are welded together; or the gun head of the laser gun is facing obliquely to the hole wall corresponding to the connecting pipe or joint and the mounting hole, and the irradiation direction of the light source of the laser gun is to radiate outward from the center of the connecting pipe or joint to the hole wall corresponding to the connecting pipe or joint and the mounting hole.

7. A clamping device for clamping a joint or a pipe, characterized in that: It comprises a tooling table (1), a plate locator (2) and a laser gun (4), wherein the tooling table (1) has a supporting plane portion (11); The plate positioner (2) comprises an action mechanism (21) and at least one abutting portion (22); the abutting portion (22) and an action arm (211) of the action mechanism (21) are fixed or limited; the abutting portion (22) is located on a first side (12) of the supporting plane portion (11); the action arm (211) of the action mechanism (21) has at least a first position and a second position; in the first position, the abutting portion (22) faces the supporting plane portion (11), and the distance between the abutting portion (22) and the supporting plane portion (11) is a first distance; in the second position, the distance between the abutting portion (22) and the supporting plane portion (11) is a second distance, and the first distance is smaller than the second distance; The support plane portion (11) has a through portion (14) that penetrates the support plane portion (11) in a height direction, and the clamping device has a support wall (311), and the support wall (311) is used to support the peripheral wall portion or the end portion of the joint or the pipe; The gun head (41) of the laser gun (4) faces the supporting plane portion (11).

8. The clamping device according to claim 7, characterized in that: At least part of the supporting wall is located at the wall portion corresponding to the penetration portion; or the clamping device has a tube positioner (3), the tube positioner (3) is located at the second side (13) of the supporting plane portion (11), and the tube positioner has a supporting wall (311); the tube positioner has an extension portion of the penetration portion, and at least part of the supporting wall is located at the wall portion corresponding to the extension portion; Alternatively, the bottom of the tube positioner (3) facing the supporting plane portion (11) has the supporting wall (311) at a position corresponding to the through portion (14).

9. The clamping device according to claim 7 or 8, characterized in that: The clamping device is used for a fluid conducting device, which at least has a flow channel plate and the joint or connecting pipe. The penetrating portion is used to accommodate a part of the joint or connecting pipe. The plate positioner is used to press and position the flow channel plate. At the first distance, the abutting portion and the flow channel plate abut against each other.

10. The clamping device according to claim 8, characterized in that: The tube positioner has a housing portion (31), the housing portion (31) includes a groove bottom (312), a groove side wall (313) and a platform portion (314), the supporting wall (311) is located at a position corresponding to the position of the groove bottom (312) and the through portion (14), the groove side wall (313) is integrally connected with the platform portion (314), and the platform portion (314) and the supporting plane portion (11) are assembled.

11. The clamping device according to claim 8, characterized in that: The pipe positioner has a receiving portion (31), the receiving portion (31) includes a groove bottom (312), a groove side wall (313) and a platform portion (314), the groove side wall (313) is integrally connected with the platform portion (314), and the platform portion (314) and the supporting plane portion (11) are assembled; The pipe positioner (3) further comprises a spring (32), a spring cover plate (33) and a support (34); one end of the support plate (34) is fixed to the spring cover plate (33), and the other end of the support plate (34) is fixed to the bottom of the groove (312); the spring (32) is limited between the spring cover plate (33) and the bottom of the groove (312), and the supporting wall (311) is located on the spring cover plate (33).

12. The clamping device according to claim 7, 8, 9 or 10, wherein the action mechanism (21) is a flip mechanism (21a), and there are more than two flip mechanisms (21a), each of the flip mechanisms (21a) comprises the abutment portion (22), the action arm (211), a locking assembly (23), and a seat (24), the action arm (211) and the abutment portion (22) are limited or fixed, the action arm (211) and the seat (24) are hinged, and the The action arm (211) is rotatable relative to the base (24); the locking assembly (23) and the base (24) are limitedly arranged, and the locking assembly (23) can be used to lock the position of the action arm (211); the base (24) is fixed to the workbench (1); or the action mechanism (21) is a clamping mechanism (21b), the clamping mechanism (21b) has at least one positioning claw (25), and the positioning claw (25) has the abutting portion (22).

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