Electromagnetic auxiliary vacuum laser welding device

Abstract

The utility model provides an electromagnetic auxiliary vacuum laser welding device which comprises a vacuum cover, a laser welding head, a plate fixing structure and a molten pool electromagnetic auxiliary supporting device are arranged in a containing space of the vacuum cover, the plate fixing structure is used for fixing plates to be welded, and the plate fixing structure is used for fixing the plates to be welded. The molten pool electromagnetic auxiliary supporting device and the laser welding head are located on the upper side and the lower side of a welding gap of the to-be-welded plate correspondingly. An electromagnetic field generated after the molten pool electromagnetic auxiliary supporting device is powered on can generate Lorentz force in the to-be-welded plate so as to prevent melt in the molten pool generated in the process that the laser welding head welds the to-be-welded plate from dripping and flowing out of the molten pool, and the containing space is a vacuum space. According to the utility model, the part processing procedure can be simplified, materials can be saved to a certain extent, the welding period can be shortened, the welding efficiency is improved, the weld joint structure is homogenized, the root structure of a welded joint is uniform, and the mechanical property of the root of the welded joint is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vacuum welding technical field, concretely relates to an electromagnetic auxiliary vacuum laser welding device. BACKGROUND

[0002] High-strength steel material has high strength, good toughness, heat resistance and corrosion resistance due to material characteristics, and is widely used in the fields of nuclear energy, ships and petrochemical industry, such as ship plates, chemical reaction kettles and the like. With the rapid development of domestic industry, the service and environment of high-strength steel are increasingly harsh, and with the improvement of the performance of high-strength steel, the requirements for welding quality and economy are also increasingly high.

[0003] In some domestic manufacturing fields, the high-strength steel thick plate welding technology is mainly narrow gap submerged arc welding / electric arc welding in the atmospheric environment, which reduces the number of welding passes and the amount of welding material used to a certain extent compared with traditional manual welding, tungsten inert gas arc welding, gas metal arc welding and submerged arc welding, improves the welding efficiency, and reduces the welding deformation, but the narrow gap welding technology sometimes still has problems of excessive joint organization and reduced mechanical properties. For the thick plate of some parts with high weld quality requirements, under the condition that the part size is not very large, vacuum electron beam welding can be used to achieve one-pass deep penetration. Since the electron beam requires high vacuum degree and the equipment cost is high, and for magnetic materials such as high-strength steel, repeated demagnetization is required to suppress the vacuum electron beam in the welding of large thick plate parts.

[0004] Laser beam is a kind of high-energy beam, which realizes deep penetration welding through the "pool hole" mode. In order to achieve one-pass deep penetration, the laser power density needs to be increased, but with the increase of laser energy, the shielding and attenuation effect of a large amount of metal vapor and plume generated during the welding process on the high-energy beam laser gradually increases in the atmospheric environment, greatly reducing the stability and energy utilization of the welding process. By learning from the vacuum environment of vacuum electron beam, high-energy vacuum laser beam is also gradually used for welding of high-strength steel thick plate.

[0005] Researchers have been pursuing the weld penetration of high-strength steel thick plate, but ignoring the problems of back forming and defects of the weld once it is penetrated. For the plate that needs to be penetrated, whether it is vacuum laser welding or vacuum electron beam welding, there is a fatal process problem, that is, there are problems such as metal spatter, and / or lack of meat, and / or welding tumor, and / or porosity, etc. at the root of the weld. At present, the effective solution is that one is to prepare a back plate by spot welding on the back of the weld of the plate to be welded before welding, introducing welding defects such as pin tip, and / or lack of meat, and / or welding tumor, etc. into the back plate, so that the pin tip, and / or lack of meat, and / or welding tumor, etc. exist in the back plate, and finally the defects disappear with the processing and removal of the back plate; two is to reserve a lock bottom structure on the welding back plate, and finally process the lock bottom area to ensure that the weld is defect-free. Both solutions require additional part processing procedures and / or spot welding of the back plate before welding, which wastes part of the material and increases the welding cycle.

[0006] For example, patent application No. CN117564473A discloses an alternating magnetic field assisted high-power laser-arc hybrid welding method and device. The alternating magnetic field can compress the electric arc, improve the arc column energy density, expand the heating area, increase the cladding efficiency, and realize single-sided welding and double-sided forming of large thickness plates. However, the alternating magnetic field mainly acts on the electric arc, and metal materials need to be added. The welding heat input is large, the welding cost and period are increased, and the magnetic field power supply cannot be normally used in a vacuum environment. Practical new type content

[0007] Therefore, the electromagnetic auxiliary vacuum laser welding device can overcome the technical problems of introducing welding defects such as nail tips into the back plate or reserving a bottom locking structure on the welding back plate in the related art to ensure that the weld is defect-free, increase the part processing process, waste part of the material, and increase the welding period.

[0008] To solve the above problems, the electromagnetic auxiliary vacuum laser welding device comprises a vacuum cover, a laser welding head, a plate fixing structure, and a molten pool electromagnetic auxiliary support device arranged in the accommodation space of the vacuum cover. The plate fixing structure is used for fixing the to-be-welded plate. The molten pool electromagnetic auxiliary support device and the laser welding head are respectively arranged on the upper and lower sides of the welding gap of the to-be-welded plate. An electromagnetic field generated after the molten pool electromagnetic auxiliary support device is powered on can generate a Lorentz force in the to-be-welded plate to prevent the molten pool in the to-be-welded plate from flowing out of the molten pool during welding of the to-be-welded plate. The accommodation space is a vacuum space.

[0009] In some embodiments, the height of the laser welding head can be controlled to rise and fall, and the plate fixing structure can be controlled to move horizontally and / or vertically in the horizontal plane.

[0010] In some embodiments, the plate fixing structure comprises a bearing table and two groups of clamp assemblies slidingly connected to the top surface of the bearing table. The clamping plates of the two groups of clamp assemblies can be driven to move linearly towards or away from each other to achieve clamping positioning or releasing of the to-be-welded plate.

[0011] In some embodiments, the plate fixing structure further comprises a fixed support, the bearing table is assembled on the fixed support, and a first lead screw and a second lead screw are further connected between the bearing table and the fixed support. The central axis of the first lead screw is perpendicular to the central axis of the second lead screw, so that the first lead screw and the second lead screw control the horizontal movement and / or vertical movement of the bearing table, respectively.

[0012] In some embodiments, the clamp assembly further comprises an assembly base, a bottom surface of the assembly base is connected to a top surface of the bearing table through a slide rail assembly, and a welding movement driving device is further assembled on the bearing table to drive the assembly base to reciprocate linearly along a sliding direction of the slide rail assembly.

[0013] In some embodiments, the slide rail assembly between the assembly base and the bearing table of each group of clamp assemblies has multiple groups that are parallel and spaced apart from each other; and / or the welding movement driving device drives two groups of clamp assemblies to reciprocate linearly along the sliding direction of the slide rail assembly at the same time.

[0014] In some embodiments, the molten pool electromagnetic auxiliary support device is fixed on the top surface of the bearing table and between the two groups of clamp assemblies, the molten pool electromagnetic auxiliary support device comprises a base, an assembly groove is arranged on the top surface of the base, an electromagnetic assembly is assembled in the assembly groove, the electromagnetic assembly comprises an iron core and an energized coil wound on the iron core, and the iron core is C-shaped.

[0015] In some embodiments, the electromagnetic assembly is provided with two groups, the magnetic poles of the C-shaped iron cores of the two groups of electromagnetic assemblies are attached to each other; and / or a water-cooling pipe is further wound on the iron core, and the water-cooling pipe forms a water-cooling circulation with a water-cooling machine outside the accommodation space.

[0016] In some embodiments, the outer side of the base is further covered with a sealing protective cover, and the area corresponding to the magnetic pole position of the iron core of the sealing protective cover is a through hole.

[0017] In some embodiments, the sealing protective cover is fixedly connected to the base, and the sealing protective cover is supported in the accommodation groove of the bearing table through a plurality of threaded rods, and each threaded rod is arranged around the sealing protective cover.

[0018] The electromagnetic auxiliary vacuum laser welding device provided by the utility model has the following beneficial effects:

[0019] By setting the laser welding joint in the vacuum environment inside the vacuum cover and setting the molten pool electromagnetic auxiliary support device in the lower area at the same time, the existing defects of metal spatter and / or porosity at the root of the vacuum laser welding seam of the high-strength steel thick plate can be quickly and efficiently solved, the defects can be effectively avoided by using the back spot welding back plate or reserving the bottom locking structure in the existing technology of thick plate vacuum laser welding, the part processing process can be simplified, the material can be saved to a certain extent, the welding cycle can be reduced, and the welding efficiency can be improved. It can be understood that by adjusting appropriate current, frequency and magnetic field strength, electromagnetic auxiliary molten pool support of different thickness plates can be effectively formed, and double-sided forming of high-strength steel thick plate welding can be realized. It is worth emphasizing that preventing the welding molten pool droplets from flowing downward can realize the homogenization of the weld structure, make the root structure of the welding joint uniform, and improve the mechanical properties of the root of the welding joint. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. The drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creating labor.

[0021] Figure 1 It is the overall structure schematic diagram of the electromagnetic auxiliary vacuum laser welding device in the embodiment of the present application.

[0022] Figure 2 It is Figure 1 It is the three-dimensional structure schematic diagram of the bearing table in

[0023] Figure 3 It is Figure 2 The screw horizontal / vertical movement structure schematic diagram between the bottom side of the bearing table and the fixed support in

[0024] Figure 4 It is Figure 1 The structure schematic diagram of the molten pool electromagnetic auxiliary support device in

[0025] Figure 5 It is Figure 4 The schematic diagram of the molten pool electromagnetic auxiliary support device in

[0026] Figure 6 It is the principle schematic diagram of using electromagnetic to form bottom support for the melt in the molten pool in the prior art.

[0027] Figure 7 It is Figure 1 The structure schematic diagram of the clamp assembly in

[0028] The reference signs are:

[0029] 1, vacuum cover; 2, laser welding head; 21, welding head support; 3, plate fixing structure; 31, bearing table; 311, first screw rod; 312, second screw rod; 313, accommodating groove; 32, clamp assembly; 321, clamping plate; 322, assembly base plate; 33, fixing support; 34, slide rail assembly; 4, molten pool electromagnetic auxiliary support device; 41, base; 411, assembly groove; 42, electromagnetic assembly; 421, iron core; 4211, magnetic pole; 422, energized coil; 43, water-cooled pipe; 44, sealing protective cover; 441, threaded rod; 442, through hole; 51, water-cooled machine; 52, vacuum pump; 53, welding control computer; 54, laser; 55, power supply; 56, electromagnetic induction control unit; 57, aviation plug; 58, flange; 100, plate to be welded. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0032] For purposes of the description hereinafter, spatial relations terms, such as "above", "below", "upper", "lower", and the like, can be used with respect to the device or feature under discussion. It will be understood that spatial terms are intended to encompass different orientations of the device or feature in use or operation in addition to the orientations depicted in the figures. For example, if a device or feature is turned over, then a surface can be "above" or "below" another surface that was "above" or "below" the surface as it was originally depicted in the figure. Accordingly, the example term "above" can encompass both an orientation that is "above" and an orientation that is "below". The device or feature can also be oriented in other ways (rotated 90° or at other orientations) and the spatial terms used herein interpreted accordingly.

[0033] In addition, it needs to be explained that the use of "first", "second" and the like words to limit the parts, only for the convenience of the corresponding parts for the distinction, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the scope of protection of the utility model.

[0034] Referring to Figures 1 to 7 As shown, according to the embodiment of the utility model, an electromagnetic auxiliary vacuum laser welding device is provided, comprising a vacuum cover 1, a laser welding head 2, a plate fixing structure 3 and a molten pool electromagnetic auxiliary support device 4 are arranged in the accommodating space of the vacuum cover 1, it can be understood that the accommodating space is a vacuum space, which can be realized by the vacuum degree of the vacuum pump 52 outside the vacuum cover 1 to the target vacuum degree (such as 10-3Pa) Figure 1 As shown, in a specific embodiment, two vacuum pumps 52 are used, wherein the plate fixing structure 3 is used to fix the to-be-welded plate 100, and the molten pool electromagnetic auxiliary support device 4 is located on the upper and lower sides of the welding gap of the to-be-welded plate 100, and specifically, referring to Figure 1 As shown, the aforementioned laser welding head 2 is supported and fixed by the welding head support 21 above the to-be-welded plate 100, and the molten pool electromagnetic auxiliary support device 4 is below the to-be-welded plate 100, the electromagnetic field generated after the molten pool electromagnetic auxiliary support device 4 is energized can generate Lorentz force in the to-be-welded plate 100 to prevent the molten pool in the to-be-welded plate 100 from flowing out of the molten pool during the welding process of the to-be-welded plate 100, and the support effect of the electromagnetic field on the molten pool can be seen from Figure 6As shown, the alternating current passes through the power coil 422 (induction coil) to generate an alternating magnetic field, the alternating electromagnetic field is applied to the back of the thick plate, and the molten pool generates an electric current under the electromagnetic induction when the laser sweeps, and the electric current generates an electromagnetic force (i.e. the aforementioned Lorentz force) under the action of the magnetic field, the electromagnetic force performs electromagnetic stirring on the molten pool, thereby realizing the support of the molten pool bottom to prevent the molten metal from flowing out and dropping, and improving the welding quality. It can be understood that the laser 54 matched with the laser welding head 2 and the power supply 55 are all outside the vacuum cover 1 to avoid the influence of the vacuum on the corresponding components. The aforementioned laser welding head 2 and the corresponding laser 54 and power supply 55 are conventional components in the field of laser welding, and the utility model only applies the performance of laser welding, and does not intend to improve the specific structure.

[0035] In the technical scheme, by arranging the laser welding head 2 in the vacuum environment in the vacuum cover 1 and simultaneously arranging the molten pool electromagnetic auxiliary support device 4 in the lower region of the laser welding head 2, the existing defects such as metal spatter and / or porosity at the root of the vacuum laser welding seam of the high-strength steel thick plate can be quickly and efficiently solved, the back spot welding back plate or the reserved bottom locking structure in the prior art of the thick plate vacuum laser welding can be effectively avoided to lead to defects, the machining process of the parts can be simplified, the material can be saved to a certain extent, the welding period can be reduced, the welding efficiency can be improved. And it can be understood that by adjusting appropriate current, frequency and magnetic field strength, electromagnetic auxiliary molten pool support of different thickness plates can be effectively formed, and double-sided forming of high-strength steel thick plate welding can be realized. It is worth emphasizing that preventing the welding molten pool droplets from flowing downward can realize the homogenization of the weld structure, make the root structure of the welded joint uniform, and improve the mechanical properties of the root of the welded joint.

[0036] In some embodiments, the height of the laser welding head 2 can be controlled to rise and fall, and the plate fixing structure 3 can be controlled to move horizontally and / or vertically in the horizontal plane, so that the welding device can be applied to the welding of plates of different thicknesses, and the welding path control of the laser welding head 2 is simplified. Specifically, the aforementioned laser welding head 2 can be controlled and adjusted in height by a vertically arranged lifting drive module, and the aforementioned lifting drive mold is specifically fixed and assembled on the welding head support 21, while the horizontal and vertical displacement of the laser welding head 2 does not need to be adjusted, thereby simplifying the difficulty of position adjustment of the laser welding head 2.

[0037] Specifically refer to Figure 7As shown, in some embodiments, the plate fixing structure 3 comprises a bearing table 31 and two groups of clamp assemblies 32 slidingly connected to the top surface of the bearing table 31, and each group of the clamp assemblies 32 has a clamping plate 321 capable of being driven to move linearly towards or away from each other to achieve clamping positioning or releasing of the to-be-welded plate 100. Specifically, by arranging two groups of clamp assemblies 32 on the left and right sides of the to-be-welded plate 100 respectively, the to-be-welded plate 100 between them is clamped in the center, preventing the to-be-welded plate 100 from deforming and shifting due to high temperature during welding, thereby ensuring more reliable and stable welding quality. Figure 7 As shown, the clamp assembly 32 further comprises an assembly base plate 322, on which a feeding adjustment component (such as a manual screw, not shown in the figure) and a sliding rod structure connected with the aforementioned clamping plate 321 are specifically connected, and a manual adjustment (manual adjustment) is preferably adopted to avoid the hidden troubles of conventional pneumatic or oil hydraulic telescopic cylinders in a vacuum environment.

[0038] The horizontal and / or vertical movement of the aforementioned plate fixing structure 3 in the horizontal plane can be achieved in the following way, specifically referring to Figure 3 As shown, the plate fixing structure 3 further comprises a fixed support 33, the bearing table 31 is assembled on the fixed support 33, and the bearing table 31 and the fixed support 33 are further connected with a first screw 311 and a second screw 312, the central axis of the first screw 311 and the central axis of the second screw 312 are perpendicular to each other so that the first screw 311 and the second screw 312 control the horizontal and / or vertical movement of the bearing table 31 respectively, and it can be understood that corresponding guide rail assemblies (not labeled in the figure) are also provided between the mating surfaces of the fixed support 33 and the bearing table 31, and each guide rail assembly is designed in layers in height with the first screw 311 and the second screw 312 to ensure the horizontal movement control of each component on the bearing table 31 when the first screw 311 is rotated, and the vertical movement control of each component on the bearing table 31 when the second screw 312 is rotated, of course, according to the actual design, one of the aforementioned first screw 311 and second screw 312 in the upper position will also move and adjust under the driving action of the one in the lower position. In this way, the to-be-welded plate 100 above the bearing table 31 can be accurately positioned in the horizontal plane with the laser welding head 2 above.

[0039] The clamp assembly 32 further comprises an assembly base plate 322, the bottom surface of the assembly base plate 322 is slidably connected with the top surface of the bearing table 31 through a slide rail assembly 34, specifically, the aforementioned slide rail assembly 34 comprises a slide rail fixedly connected with the top surface of the bearing table 31 and a slide block fixedly connected with the bottom surface of the assembly base plate 322, and a welding movement driving device (not shown in the figure) is further assembled on the bearing table 31, which is used to drive the assembly base plate 322 to reciprocate linearly along the sliding direction of the slide rail assembly 34, and the aforementioned welding movement driving device can specifically adopt an electric sliding module (commercially available) suitable for a vacuum environment with a high protection level, and the specific implementation structure is not particularly limited in the utility model, and in principle, it can be applied to a vacuum environment and can be precisely controlled to generate linear reciprocating displacement, so that the welding movement driving device controls the to-be-welded plate 100 to move linearly along the extension direction of the weld, thereby ensuring efficient welding.

[0040] In some embodiments, the slide rail assembly 34 between the assembly base plate 322 and the bearing table 31 in each group of the clamp assembly 32 has multiple groups that are parallel and spaced apart from each other, and the multiple groups of slide rail assemblies 34 guide the synchronous movement of the to-be-welded plate 100, which can ensure the reliable stability of the overall movement of the clamp assembly 32 when the to-be-welded plate 100 is large in thickness and size. In another preferred embodiment, the welding movement driving device drives two groups of the clamp assembly 32 to reciprocate linearly along the sliding direction of the slide rail assembly 34, that is, the two groups of clamp assemblies 32 are driven to move by the same welding movement driving device, which can ensure the synchronization of the movement of the clamp assemblies 32 on both sides and further ensure the reliable clamping of the to-be-welded plate 100.

[0041] For reference, Figure 4 and Figure 5 As shown in the figures, in some embodiments, the molten pool electromagnetic auxiliary support device 4 is fixed on the top surface of the bearing table 31 and is located between the two groups of clamp assemblies 32, so as to be aligned with the matching gap position between the to-be-welded plate 100, the molten pool electromagnetic auxiliary support device 4 comprises a base 41, an assembly groove 411 is arranged on the top surface of the base 41, an electromagnetic assembly 42 is assembled in the assembly groove 411, the electromagnetic assembly 42 comprises an iron core 421 and an energized coil 422 wound on the iron core 421, and the iron core 421 is C-shaped.

[0042] In the technical solution, on the one hand, the electromagnetic assembly 42 is arranged in the assembly groove 411, which can ensure the reliable stability of the position of the electromagnetic assembly 42, and on the other hand, the iron core 421 is designed to be C-shaped, which can make the magnetic pole 4211 of the iron core 421 be located at the central position of the base 41, thereby facilitating the alignment of the magnetic pole 4211 with the matching gap position of the to-be-welded plate 100 above.

[0043] With reference to the drawings in detail Figure 4 As shown in some embodiments, the electromagnetic assembly 42 is provided with two groups, and the magnetic poles 4211 of the C-shaped cores 421 of the two groups of electromagnetic assemblies 42 are attached to each other. By providing two groups of electromagnetic assemblies 42 and attaching the magnetic poles 4211 of the cores 421 in the two groups of electromagnetic assemblies 42, one or both of the two groups of electromagnetic assemblies 42 can be selected to generate an electromagnetic field according to the actual power requirement, so that the welding device of the utility model can realize electromagnetic support for the bottom of the molten pool of a plate with a larger thickness.

[0044] The core 421 is further provided with a water cooling pipe 43, and the water cooling pipe 43 forms a water cooling cycle with a water cooling machine 51 outside the accommodating space, so as to reduce the temperature rise of the electromagnetic assembly 42 caused by the heat generated by the energized coil 422 during operation, prevent the high temperature from damaging the insulation performance of the energized coil 422, and prevent safety hazards.

[0045] With reference to the drawings in detail Figure 5 As shown in some embodiments, the outer side of the base 41 is further provided with a sealing protective cover 44, and the region corresponding to the magnetic poles 4211 of the core 421 of the sealing protective cover 44 is a through hole 442. It can be understood that the sealing protective cover 44 should be made of a material with a high melting point and no magnetic permeability, so as to isolate the high temperature of the molten pool and reduce the magnetic leakage on the electromagnetic assembly 42. The sealing protective cover 44 can avoid damage to the molten pool electromagnetic auxiliary support device 4 during welding, and can also make the molten pool electromagnetic auxiliary support device 4 relatively sealed, so as to avoid discharge and stop working of the molten pool electromagnetic auxiliary support device 4 in a vacuum environment.

[0046] In some embodiments, the sealing protective cover 44 is fixedly connected with the base 41, and the sealing protective cover 44 is supported in the accommodating groove 313 of the bearing table 31 through a plurality of threaded rods 441, and each threaded rod 441 is arranged around the sealing protective cover 44. In this technical solution, the height of the molten pool electromagnetic auxiliary support device 4 is adjusted by screwing the threaded rods 441, so as to adjust the distance of the plate to be welded 100 with different thicknesses, and the effective electromagnetic support is distinguished.

[0047] The aforementioned electromagnetic auxiliary vacuum laser welding device further comprises a welding control computer 53 and an electromagnetic induction control unit 56 (for example, a corresponding integrated controller) outside the vacuum cover 1, wherein the welding control computer 53 is mainly used for controlling the movement of the plate 100 to be welded and performing necessary teaching programming, and the electromagnetic induction control unit 56 is used for controlling the operation of the electromagnetic component 42 in the molten pool electromagnetic auxiliary support device 4 and can be used for controlling the matching circulation of the water cooling machine 51 and the water cooling pipe 43, and it can be understood that, among the aforementioned components, the control communication between the inside and outside of the vacuum cover 1 is preferably achieved by using an aviation plug 57, and a corresponding flange 58 should be arranged on the corresponding wall surface of the vacuum cover 1 to ensure the sealing property of the vacuum cover 1. The aforementioned welding control computer 53 is also used for controlling the height of the laser welding head 2 during the welding process when the height of the laser welding head 2 can be adjusted.

[0048] It can be understood by those skilled in the art that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetically assisted vacuum laser welding device, characterized in that, The device includes a vacuum chamber (1), within which a laser welding head (2), a plate fixing structure (3), and a molten pool electromagnetic auxiliary support device (4) are disposed. The plate fixing structure (3) is used to fix the plate to be welded (100). The molten pool electromagnetic auxiliary support device (4) and the laser welding head (2) are located on the upper and lower sides of the welding gap of the plate to be welded (100), respectively. The electromagnetic field generated by the molten pool electromagnetic auxiliary support device (4) after being energized can generate a Lorentz force in the plate to be welded (100) to prevent the molten material in the molten pool generated by the laser welding head (2) during the welding of the plate to be welded (100) from dripping out of the molten pool. The accommodating space is a vacuum space.

2. The electromagnetic assisted vacuum laser welding apparatus according to claim 1, characterized in that, The height of the laser welding head (2) can be controlled to rise and fall, and the plate fixing structure (3) can be controlled to move laterally and / or longitudinally in the horizontal plane.

3. The electromagnetic assisted vacuum laser welding apparatus according to claim 2, characterized in that, The plate fixing structure (3) includes a support platform (31) and two sets of clamping assemblies (32) slidably connected to the top surface of the support platform (31). The clamping plates (321) of the two sets of clamping assemblies (32) can be driven to move closer or further away from each other in a straight line to achieve clamping and positioning or releasing of the plate to be welded (100).

4. The electromagnetic assisted vacuum laser welding apparatus according to claim 3, characterized in that, The plate fixing structure (3) also includes a fixing bracket (33), the bearing platform (31) is assembled on the fixing bracket (33), and a first lead screw (311) and a second lead screw (312) are connected between the bearing platform (31) and the fixing bracket (33). The central axis of the first lead screw (311) and the central axis of the second lead screw (312) are perpendicular to each other so that the first lead screw (311) and the second lead screw (312) control the horizontal and / or vertical movement of the bearing platform (31) respectively.

5. The electromagnetic assisted vacuum laser welding apparatus according to claim 4, characterized in that, The clamp assembly (32) further includes an assembly base plate (322), the bottom surface of which is slidably connected to the top surface of the support platform (31) via a slide rail assembly (34), and a welding moving drive device is also assembled on the support platform (31) to drive the assembly base plate (322) to reciprocate linearly along the sliding direction of the slide rail assembly (34).

6. The electromagnetic assisted vacuum laser welding apparatus according to claim 5, characterized in that, Each of the clamping assemblies (32) has multiple sets of slide rail assemblies (34) between the assembly base plate (322) and the support platform (31) that are parallel to each other; and / or, the welding moving drive device simultaneously drives two sets of clamping assemblies (32) to reciprocate linearly along the sliding direction of the slide rail assembly (34).

7. The electromagnetic assisted vacuum laser welding apparatus according to claim 3, characterized in that, The molten pool electromagnetic auxiliary support device (4) is fixed on the top surface of the support platform (31) and located between the two sets of clamp assemblies (32). The molten pool electromagnetic auxiliary support device (4) includes a base (41). An assembly groove (411) is provided on the top surface of the base (41). An electromagnetic component (42) is assembled in the assembly groove (411). The electromagnetic component (42) includes an iron core (421) and an energized coil (422) wound on the iron core (421). The iron core (421) is C-shaped.

8. The electromagnetic assisted vacuum laser welding apparatus according to claim 7, characterized in that, The electromagnetic components (42) are provided in two sets, and the magnetic poles (4211) of the C-shaped iron cores (421) of the electromagnetic components (42) are attached to each other; and / or, a water-cooling pipe (43) is also wound around the iron core (421), and the water-cooling pipe (43) forms a water-cooling cycle with the water chiller (51) located outside the accommodating space.

9. The electromagnetic assisted vacuum laser welding apparatus according to claim 7, characterized in that, The outer side of the base (41) is also covered with a sealing protective cover (44), and the area of ​​the sealing protective cover (44) corresponding to the position of the magnetic pole (4211) of the iron core (421) is a through hole (442).

10. The electromagnetic assisted vacuum laser welding apparatus according to claim 9, characterized in that, The sealing cover (44) is fixedly connected to the base (41), and the sealing cover (44) is supported in the receiving groove (313) of the support platform (31) by multiple threaded rods (441), and each threaded rod (441) is arranged around the sealing cover (44).

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