A universal fixture for micro-component section micro-gravity environment welding

Abstract

The present application relates to the field of precision assembly and special processing technology, and particularly relates to a universal clamp for welding of micro parts in a microgravity environment, which comprises a clamp base, four sliding push blocks, four lateral adjusting blocks, four adjusting bolts and a central fastening screw set. A cross-shaped groove system is arranged on the upper surface of the clamp base, which is composed of two groups of mutually perpendicular trapezoidal cross-section guide grooves with the same groove depth and inclination angle, and a sample groove is formed at the intersection. A rectangular groove is arranged on the bottom of one group of guide grooves in the axial direction, so that the welding part is suspended. The four sliding push blocks realize four-way clamping and position adjustment of the parts at the same height level, and the central fastening screw set provides vertical auxiliary compression. The present application has the advantages of simple structure, strong universality, complete opening above the clamping part, and suspended design at the bottom, which can effectively overcome the problems caused by heat accumulation or adhesion of micro parts in laser or electron beam welding, and meet the high-precision welding requirements in a microgravity environment.

Description

Technical Field

[0001] This invention relates to the field of precision assembly and special processing technology, specifically a universal fixture for welding the cross-section of micro-components under microgravity conditions. Background Technology

[0002] Miniature components (such as aerospace precision components and miniature sensors) are widely used in high-tech fields such as aerospace, microelectronics, communications, and sensors. During their service life, miniature components are prone to localized fractures due to mechanical shocks or fatigue loads. Once fractured, the entire device will fail completely, potentially affecting the operation of the entire system. Therefore, developing precision welding repair technologies and equipment for fractured areas of miniature components has significant practical value.

[0003] Both laser welding and electron beam welding are fusion welding technologies. When used for welding and repairing micro-components, they can employ self-fusion or, as needed, add filler materials, making them highly promising welding and repair technologies for microgravity environments in space. Electron beam welding requires a vacuum environment identical to that in space, eliminating the need for an additional vacuum chamber on Earth. Furthermore, electron beam welding boasts high energy density, a large weld depth-to-width ratio, and a small heat-affected zone, and its development is relatively mature. Laser welding, on the other hand, offers advantages in terms of lightweight equipment and flexibility.

[0004] In microgravity environments, laser welding and electron beam welding face a series of unique challenges compared to terrestrial gravity environments when used for welding micro-components. Firstly, micro-components are small and weak; even minute recoil forces or thermal stresses under microgravity can cause drift, warping, or vibration. Traditional gravity-based stabilization methods fail, making it difficult to maintain positioning accuracy, necessitating the application of clamping forces. Secondly, in microgravity, natural convection virtually disappears, and heat conduction becomes the primary heat dissipation path. For micro-components, heat tends to accumulate rapidly in localized areas and cannot be effectively dissipated through air convection, leading to significant thermal deformation and making misalignment or misalignment during cross-sectional welding highly likely. Therefore, welding micro-components in microgravity environments places higher demands on welding clamps. The welding clamps must provide stable multi-directional constraints throughout the entire process, and the area to be welded must be suspended to prevent the component from being welded directly to the clamp.

[0005] Existing welding fixtures have the following shortcomings: First, micro-devices come in various shapes (such as beam, plate, ring, and column types), and existing fixtures lack versatility, typically requiring individual design and manufacturing for each component, resulting in high costs and long lead times. Second, cross-sectional welding requires aligning the cross-sections of two broken parts, demanding high centering accuracy. Existing fixtures are insufficient in four-way symmetrical clamping capabilities, and under microgravity conditions, component drift and uneven heat dissipation during welding further degrade welding quality. Third, the clamping force adjustment is not flexible enough, making it difficult to balance clamping stability with preventing secondary damage to brittle micro-devices. Therefore, there is an urgent need for a universal fixture suitable for welding cross-sections of micro-devices under microgravity conditions, enabling stable, versatile, and high-precision clamping and fixation of micro-devices. Summary of the Invention

[0006] The purpose of this invention is to provide a universal fixture for welding the cross-section of micro-components under microgravity conditions, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a universal fixture for welding micro-component cross-sections under microgravity conditions, comprising: a fixture base, wherein the upper surface of the fixture base is provided with a cross-shaped groove system, the cross-shaped groove system being composed of a first set of guide grooves extending along the X direction and a second set of guide grooves extending along the Y direction, the X direction and the Y direction being perpendicular to each other, the cross-section of the guide grooves being trapezoidal, and the groove depth and groove wall inclination angle of both being the same; a rectangular groove is further formed at the bottom of the trapezoidal cross-section of the first set of guide grooves along the length direction of the guide groove, the intersection area of ​​the first set of guide grooves and the second set of guide grooves forming a clamping space for accommodating the component to be welded, and suspending the welding part of the component above the rectangular groove;

[0008] A clamping adjustment assembly, disposed on the clamp base, is used to apply horizontal clamping force to the welded parts located in the clamping space from four mutually perpendicular directions and adjust their position.

[0009] And a central fastening screw assembly, the central fastening screw assembly including at least one clamping unit consisting of fastening screws and a pressure plate, the fastening screws passing through the pressure plate and screwed into the clamp base.

[0010] As a further aspect of the present invention: the clamping adjustment assembly includes:

[0011] Four sliding push blocks, including two first push blocks that slide in conjunction with the first set of guide grooves and two second push blocks that slide in conjunction with the second set of guide grooves, wherein the first push blocks and the second push blocks are at the same height level in the clamping space;

[0012] Four lateral adjustment blocks are fixed to the four sides of the fixture base, and each lateral adjustment block is provided with a horizontal threaded through hole;

[0013] Four adjusting bolts are screwed into the corresponding horizontal threaded through holes, and the end of each adjusting bolt passes through the fixture base and abuts against the corresponding sliding push block.

[0014] As a further aspect of the present invention: the trapezoidal cross-section of the first group of guide grooves and the second group of guide grooves has a groove depth of 4-8 mm, a cross-section opening width of 12-22 mm, and a groove wall inclination angle of 10°-35°; the rectangular groove at the bottom of the first group of guide grooves has a width of 4-10 mm and a depth of 4-6 mm.

[0015] As a further aspect of the present invention: the top of the clamping surface of the sliding push block facing the sample slot is at the same level as the upper surface of the fixture base.

[0016] As a further aspect of the present invention: the external dimensions of the fixture base are (80-150) mm × (80-150) mm × (20-35) mm, the net planar dimensions of the sample slot are (15-25) mm × (15-25) mm, and the length of the sliding push block is 20-60 mm.

[0017] As a further aspect of the present invention: the adjusting bolt has a specification of M6 to M12, a pitch of 0.75 to 1.75 mm, an effective adjustment stroke of 10 to 30 mm, and a corresponding clamping outer dimension range of 4 to 25 mm for the clampable parts.

[0018] As a further aspect of the present invention: the four adjusting bolts operate independently of each other. When the four adjusting bolts are screwed in synchronously with the same amount of screwing, the four sliding push blocks converge symmetrically to achieve the centering of the welded parts.

[0019] As a further aspect of the present invention: the upper surface of the fixture base forms a flat support platform, the support platform is coplanar with the opening edge of each guide groove, and there are no other structural components above the fixture except for the clamping unit. The clamping unit is located in the outer peripheral area of ​​the sample groove and does not obstruct the space directly above the sample groove.

[0020] Compared with the prior art, the beneficial effects of this invention are: 1. Flexible and balanced clamping: The two sets of trapezoidal guide grooves have the same depth and inclination angle, and the four push blocks can move on the same reference plane, enabling flexible adjustment and stable and balanced clamping of micro-parts, and allowing flexible adjustment of the position of the welding part in the fixture. The clamping unit is arranged in the outer periphery of the sample cell, without obstructing the space directly above the sample cell. The laser welding head or electron beam welding system can approach the fractured part of the part in the sample cell from any angle without obstruction, and can further clamp and fix the part, improving the clamping capacity.

[0021] 2. Fine adjustment of clamping force: The feed rate is controlled by adjusting the pitch of the bolt. The axial feed rate per revolution is equal to the pitch (e.g., 0.75-1.75mm). The clamping force can be continuously controlled to adapt to the different clamping force requirements of micro parts made of different materials.

[0022] 3. Suspended anti-adhesion design: By adding a rectangular deep groove at the bottom of one of the trapezoidal cross-section guide grooves of the same height, the cross intersection of the micro-devices can be partially suspended, which can prevent the molten material from thermally adhering to the fixture base during welding.

[0023] 4. Easy to operate, simple structure, and highly versatile: The clamping operation only requires using a wrench to rotate and adjust the bolt. The number of parts is small, making it easy to process and manufacture. It is highly versatile and suitable for welding various parts of different materials, shapes, and sizes. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a general-purpose fixture for welding the cross-sections of micro-components under microgravity conditions.

[0025] Figure 2 This is a schematic diagram of the fixture base in a general-purpose fixture used for welding the cross-section of micro-components under microgravity conditions.

[0026] In the figure: 1. Fixture base; 2. Lateral adjustment block; 3. Side block fastening screw; 4. Adjusting bolt; 5. Sliding push block; 6. Guide groove; 7. Central fastening screw group; 8. Sample slot. Detailed Implementation

[0027] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] Please see Figure 1 and Figure 2 In one embodiment of the present invention, a universal fixture for welding the cross-section of micro-components under microgravity conditions includes a fixture base 1, four sliding push blocks 5, four lateral adjustment blocks 2, four adjustment bolts 4, and a central fastening screw group 7.

[0030] The fixture base 1 is a rectangular plate structure with a cross-shaped groove system on its upper surface. This cross-shaped groove system consists of a first set of guide grooves 6 extending along a first direction (X direction) and a second set of guide grooves 6 extending along a second direction (Y direction), the first and second directions being perpendicular to each other. The cross-sections of both sets of guide grooves 6 are trapezoidal, with the groove walls sloping outwards from top to bottom. The opening at the upper end of the cross-section is narrower than the bottom end, and the trapezoidal slope forms a vertical constraint on the sliding push block 5 embedded within it. The trapezoidal cross-sections of the first and second sets of guide grooves 6 have the same groove depth and inclination angle. Specifically, a rectangular groove is further formed axially downwards at the bottom center of the trapezoidal cross-section of the first set of guide grooves 6. The intersection of the two sets of guide grooves 6 forms a sample groove 8 for accommodating the parts to be welded. The presence of the bottom rectangular groove allows the parts placed at the intersection to be partially suspended, preventing the molten material from thermally adhering to the fixture base during welding.

[0031] The four sliding push blocks 5 include two first push blocks (X-direction push blocks) that slide in conjunction with the first set of guide grooves 6 and two second push blocks (Y-direction push blocks) that slide in conjunction with the second set of guide grooves 6. Since the trapezoidal portions of the two sets of guide grooves have the same depth, the first and second push blocks are at the same height level within the sample groove 8, thus achieving coplanar clamping when the four push blocks are pushed into the sample groove 8. The clamping surface of each sliding push block 5 facing the sample groove 8 is at the same horizontal plane as the upper surface of the fixture base 1 to ensure that the upper surface of the clamped device remains horizontal. The outer end face of each sliding push block 5 serves as the abutment surface for the adjusting bolt 4.

[0032] Four lateral adjustment blocks 2 are fixed to the four sides of the fixture base 1, respectively. The height of each lateral adjustment block 2 is the same as that of the fixture base 1, and they are fixed to the side of the base by two vertically symmetrically arranged side block fastening screws 3. Each lateral adjustment block 2 has a horizontal threaded through hole, and the axis of the horizontal threaded through hole is coaxial with the axis of the corresponding guide groove 6.

[0033] Four adjusting bolts 4 are screwed into corresponding horizontal threaded through holes. The end of each adjusting bolt 4 passes through the guide hole on the side wall of the fixture base 1 and abuts against the outer end face of the corresponding sliding push block 5. When the adjusting bolt 4 is tightened, the bolt end applies an axial thrust to the sliding push block 5, driving the sliding push block 5 to slide inward along the corresponding guide groove 6. With each rotation, the axial feed of the sliding push block 5 is equal to the pitch of the adjusting bolt 4, thereby achieving precise control of the clamping displacement. The four adjusting bolts 4 operate independently: when the four adjusting bolts 4 are advanced, the four sliding push blocks 5 converge symmetrically to achieve precise fixation of the welded parts; when one or more adjusting bolts 4 are adjusted individually with different screw-in amounts, the corresponding sliding push block 5 produces non-uniform displacement, which can adapt to the clamping and positioning of components with offset fracture surfaces or irregular shapes.

[0034] The central fastening screw assembly 7 includes at least one clamping unit consisting of a fastening screw and a pressure plate. The fastening screw passes through the pressure plate and is screwed into the clamping base 1. The top of the clamping surface of the sliding push block 5 facing the clamping space is at the same level as the upper surface of the clamping base 1. Under the action of microgravity, the welded parts are initially in a floating state. With the cooperation of the four sliding push blocks 5, the upper surface of the welded parts can be at the same level as the upper surface of the clamping base 1 in a horizontal clamping state. The head of the fastening screw abuts against the upper surface of the pressure plate. When the fastening screw is screwed in, the pressure plate moves downward along the axial direction of the fastening screw, and the rubber pad on the lower surface of the pressure plate just contacts the upper surface of the welded parts, realizing vertical auxiliary limiting. In this embodiment, the central fastening screw assembly 7 includes four clamping units, which are evenly distributed at the four corners of the sample slot 8. The fastening screw passes through the pressure plate and screws into the fixture base 1. The pressure plate is movably sleeved on the fastening screw between the head of the fastening screw and the fixture base 1. When the fastening screw is rotated, it drives the pressure plate to move towards the sample groove 8. The soft pad on the lower surface of the pressure plate presses the welded parts, providing vertical auxiliary clamping to prevent the parts from floating or axially shifting due to vibration or thermal stress during the welding process.

[0035] The upper surface of the fixture base 1 forms a flat support platform between each guide groove 6, and this support platform is coplanar with the opening edge of each guide groove 6. Apart from the clamping unit, there are no other structural components above the fixture as a whole, and the clamping unit is located in the outer peripheral area of ​​the sample groove 8, without obstructing the space directly above the sample groove 8. This ensures that the laser welding head and electron beam welding system can freely approach the fracture site of the device inside the sample groove 8 from any incident angle.

[0036] In a preferred embodiment, the trapezoidal cross-sections of the first and second sets of guide grooves 6 have a depth of 4–8 mm, an opening width of 12–22 mm, and a wall inclination angle of 10°–35°. The rectangular groove at the bottom of the first set of guide grooves 6 has a width of 4–10 mm and a depth of 4–6 mm. The external dimensions of the fixture base 1 are (80–150) mm × (80–150) mm × (20–35) mm, and the net planar dimensions of the sample groove 8 are (15–25) mm × (15–25) mm. The axial length of the sliding push block 5 is 20–60 mm. The specifications of the adjusting bolt 4 are M6–M12, the pitch is 0.75–1.75 mm, its effective adjustment stroke is 10–30 mm, and the corresponding clamping external dimensions of the clampable parts range from 4–25 mm. The fixture base 1, sliding push block 5, and lateral adjustment block 2 are made of aluminum alloy or austenitic stainless steel. The surface roughness Ra of the inclined surfaces of the first set of guide grooves 6 and the second set of guide grooves 6 and the corresponding mating inclined surfaces on the sliding push block 5 is no greater than 1.6 μm. The above numerical ranges, materials, and surface roughness parameters are preferred embodiments and do not constitute a limitation on the scope of protection of this invention.

[0037] Example

[0038] This embodiment uses the welding of a broken copper cantilever beam as an example to illustrate the use of the universal fixture of the present invention. The component to be repaired is a copper microbeam with a cross-sectional width of 300 μm, a thickness of 80 μm, and a total length of 10 mm. It fractures laterally at a distance of 4 mm from the fixed end and is repaired by laser welding.

[0039] The specific parameters of the fixture used in this embodiment are as follows: Fixture base 1: external dimensions 100 mm × 100 mm × 25 mm, material is 7075 aluminum alloy.

[0040] Guide groove 6: The first group of guide grooves 6 (X direction) and the second group of guide grooves 6 (Y direction) have the same trapezoidal cross-sectional dimensions, with an opening width of 18 mm, a bottom width of 12 mm, a trapezoidal groove depth of 8 mm, and a groove wall inclination angle of 20°. Among them, the bottom center of the first group of guide grooves 6 (X direction) has a rectangular groove with a width of 6 mm and a depth of 5 mm.

[0041] Sample well 8: Net dimensions of the plane are 20 mm × 20 mm.

[0042] Sliding pusher 5: Axial length is 35 mm.

[0043] Lateral adjustment block 2: fixed to the side of the base by two M4 side block fastening screws 3.

[0044] Adjusting bolt 4: M8 specification, pitch 1.25 mm, each rotation corresponds to an axial feed of 1.25 mm for the sliding push block, and the effective adjustment stroke is 20 mm.

[0045] Central fastening screw group 7: consists of four sets of fastening screws and corresponding pressure plates, evenly distributed at the four corners of sample slot 8.

[0046] The specific operation steps are as follows: (1) Fixture preparation: push the four sliding push blocks 5 to the initial position of the outer end of the corresponding guide groove 6 respectively, confirm that the net space of the sample groove 8 is 20 mm × 20 mm, and the ends of the four adjusting bolts 4 do not abut against the outer end face of the sliding push block 5.

[0047] (2) Device Placement and Four-Directional Clamping: Place the longer segment (6 mm segment) of the copper microbeam fracture horizontally in the sample slot 8, with its fractured end suspended above the rectangular slot below the first set of guide slots. Tighten the four M8 adjusting bolts 4 in sequence, each bolt being screwed in 4 turns, corresponding to a 5 mm feed of the sliding push block. At this time, the first push block (X direction) and the second push block (Y direction) converge towards the center at the same height level, symmetrically clamping the device from four directions without any height difference. The feed amount is controlled by adjusting the pitch of the bolts 4. The axial feed amount per revolution is equal to the pitch (e.g., 0.75~1.75 mm). The operator can finely adjust the clamping force by controlling the rotation angle (e.g., approximately 0.19~0.44 mm per 1 / 4 revolution). For brittle material devices (such as silicon and ceramics), it is recommended to use a step-by-step, visually inspected approach: first screw in until the pusher contacts the device, then screw in 1 / 8 to 1 / 4 turn each time, observing the device's condition until it is securely clamped without obvious deformation or cracks, thus determining that the clamping force is appropriate. For ductile metal materials (such as copper and aluminum), after the pusher contacts the device, screw in continuously until it is securely fixed. This fine-tuning method can adapt to the varying clamping force requirements of micro-components made of different materials, avoiding secondary damage to brittle devices due to excessive clamping force.

[0048] (3) Fracture surface alignment and auxiliary clamping: Place the shorter section (4 mm section) against one side of the fracture surface of the longer section to align the fracture surfaces; tighten the adjusting bolts 4 in the corresponding direction to fix the shorter section. Then, screw in each of the fastening screws in the central fastening screw group 7. Since the top of the clamping surface of the sliding push block 5 is coplanar with the upper surface of the clamping base 1, the clamped copper microbeam is initially floating under the action of microgravity, so that its upper surface is naturally at the same level as the lower surface of the pressure plate. When the central fastening screw is screwed in, the fastening screw drives the pressure plate to move downward, and the rubber pad on the lower surface of the pressure plate can directly contact the upper surface of the copper microbeam, applying a small amount of vertical auxiliary clamping force to it.

[0049] (4) Take out the parts: Loosen the fastening screws and four adjusting bolts 4 in the central fastening screw group in sequence, manually push the four sliding push blocks 5 outward along their respective guide grooves back to their initial positions, and take out the repaired parts.

[0050] Through the above operations, the welding alignment of the fracture surface of the copper microbeam is accurate, the clamping is firm and reliable, and the welding position can be flexibly adjusted.

[0051] Other implementation details

[0052] The above embodiments are only illustrated using a copper microbeam as an example. The universal clamp of the present invention is also applicable to micro-parts of other shapes and materials, such as metal microbeams, ceramic sheets, ring-shaped parts, and columnar parts. By adjusting the screw-in depth of the bolts, it can flexibly adapt to devices of different sizes. Any design that adopts the structural design of the present invention, that is, using two sets of trapezoidal cross-section guide grooves of the same depth to achieve coplanar clamping, and opening a rectangular groove at the bottom of one set to achieve partial suspension, falls within the protection scope of the present invention.

[0053] The adjusting bolts of this clamp are M6 to M12 in size, with a suitable thread size, allowing the operator to adjust them using a standard wrench or a special screwdriver. In space applications, an enlarged knob (20-40mm in diameter) can be installed at the end of the adjusting bolt for easier operation by astronauts wearing pressurized gloves; alternatively, an operating interface can be provided on the side of the clamp for remote control via a robotic arm end effector. All of the above variations fall within the scope of this invention.

[0054] This universal fixture for welding the cross-section of micro-components under microgravity conditions has a simple structure and is easy to manufacture. It can be widely used in the precision welding and repair of micro-devices in aerospace and sensor fields, and has significant industrial practical value.

[0055] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A universal fixture for welding the cross-section of micro-components under microgravity conditions, characterized in that, include: The fixture base has a cross-shaped groove system on its upper surface. The cross-shaped groove system consists of a first set of guide grooves extending along the X direction and a second set of guide grooves extending along the Y direction. The X and Y directions are perpendicular to each other. The cross-section of each guide groove is trapezoidal, and the groove depth and the groove wall inclination angle are the same. The bottom of the trapezoidal cross-section of the first set of guide grooves is further formed with a rectangular groove along the length of the guide groove. The intersection area of ​​the first set of guide grooves and the second set of guide grooves forms a clamping space for accommodating the welded parts and suspending the welded part of the parts above the rectangular groove. A clamping adjustment assembly, disposed on the clamp base, is used to apply horizontal clamping force to the welded parts located in the clamping space from four mutually perpendicular directions and adjust their position. And a central fastening screw assembly, the central fastening screw assembly including at least one clamping unit consisting of fastening screws and a pressure plate, the fastening screws passing through the pressure plate and screwed into the clamp base.

2. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that, The clamping adjustment assembly includes: Four sliding push blocks, including two first push blocks that slide in conjunction with the first set of guide grooves and two second push blocks that slide in conjunction with the second set of guide grooves, wherein the first push blocks and the second push blocks are at the same height level in the clamping space; Four lateral adjustment blocks are fixed to the four sides of the fixture base, and each lateral adjustment block is provided with a horizontal threaded through hole; Four adjusting bolts are screwed into the corresponding horizontal threaded through holes, and the end of each adjusting bolt passes through the fixture base and abuts against the corresponding sliding push block.

3. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that, The trapezoidal cross-sections of the first and second sets of guide grooves have a depth of 4–8 mm, an opening width of 12–22 mm, and a wall inclination angle of 10°–35°. The rectangular groove at the bottom of the first set of guide grooves has a width of 4–10 mm and a depth of 4–6 mm.

4. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that... The top of the clamping surface of the sliding pusher facing the sample slot is at the same level as the upper surface of the fixture base.

5. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that, The external dimensions of the fixture base are (80~150)mm × (80~150)mm × (20~35)mm, and the net dimensions of the sample slot are (15~25)mm × (15~25)mm.

6. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that, The adjusting bolt has a specification of M6 to M12, a pitch of 0.75 to 1.75 mm, an effective adjustment stroke of 10 to 30 mm, and a corresponding clamping dimension range of 4 to 25 mm for the parts it can clamp.

7. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that, The four adjusting bolts operate independently of each other. When the four adjusting bolts are screwed in synchronously with the same amount of screwing, the four sliding push blocks converge symmetrically to achieve the centering of the welded parts.

8. The universal fixture for welding micro-component cross-sections under microgravity conditions according to claim 1, characterized in that, The upper surface of the fixture base forms a flat support platform, which is coplanar with the opening edges of each guide groove. Apart from the clamping unit, there are no other structural components above the fixture as a whole. The clamping unit is located in the outer peripheral area of ​​the sample groove and does not obstruct the space directly above the sample groove.

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