CN216462352U - Welding jig - Google Patents

Abstract

The embodiment of the application relates to the technical field of welding processing, and discloses a welding jig which comprises a bearing part and a lower pressing part, wherein the bearing part is provided with a bearing area for bearing a part to be welded; the pressing piece is used for elastically pressing and holding the element to be welded on the part to be welded, and the pressing piece can move on the pressing piece so as to change the relative position in the bearing area of the bearing piece. The welding jig provided by the embodiment of the application can improve the universality of the welding jig and reduce the use cost of the welding jig.

Description

Welding jig

Technical Field

The embodiment of the application relates to the technical field of welding processing, in particular to a welding jig.

Background

In the SMT (Surface Mounted Technology) soldering process, electronic components (e.g., resistors and capacitors) to be soldered are Mounted on electronic components (e.g., circuit boards) to be soldered, wherein solder paste is printed on the electronic components to be soldered in advance, and after the mounting of the electronic components to be soldered is completed, the solder paste is heated to firmly bond the electronic components and the electronic components together.

At present, in order to prevent the occurrence of bubbles between the electronic component and the electronic component during the soldering process, a certain pre-pressure is applied to the electronic component attached to the electronic component during the soldering process, so that the solder paste fills the gap between the electronic component and the electronic component. The pre-pressure is realized by depending on a welding jig, but the current welding jig has poor universality and higher use cost.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a welding jig, can improve welding jig's commonality to reduce welding jig's use cost.

In order to achieve the above object, an embodiment of the present application provides a welding jig, including a bearing member and a lower pressing member, where the bearing member is provided with a bearing area for bearing a component to be welded; the lower pressing piece and the bearing piece are arranged oppositely, one side of the lower pressing piece, which is close to the bearing piece, is provided with a pressing piece, the pressing piece is used for elastically pressing and holding the element to be welded on the part to be welded, and the pressing piece can move on the lower pressing piece so as to change the relative position in the bearing area.

The lower pressing piece and the bearing piece are arranged oppositely, the lower pressing piece and the bearing piece can be matched, the pressing piece on the lower pressing piece plays a pressing and holding role on an element to be welded, which is placed on the part to be welded, and meanwhile, the pressing piece can move on the lower pressing piece to change the relative position in the bearing area of the bearing piece, namely, the relative position on the part to be welded is changed, so that after the type of the part to be welded is changed, or the layout of elements on the part to be welded is changed, the pressing and holding of the element to be welded at different positions on the part to be welded is adapted again, the universality of a welding jig is improved, and the use cost of the welding jig is reduced.

In some embodiments, a moving channel is provided on the lower press, along which the press is movable on the lower press. In this way, the stitching member can be moved easily over the lower element to change the relative position within the bearing zone.

In some embodiments, the moving channel is linear, and the pressing member is provided in plurality within the moving channel. Thus, a plurality of elements to be welded on the same straight line of the part to be welded can be pressed simultaneously.

In some embodiments, there are a plurality of the moving channels, and a plurality of the moving channels are arranged in parallel. In this way, the pressing of the elements to be welded on different straight lines of the part to be welded can be achieved.

In some embodiments, two adjacent moving passages communicate with each other. In this way, the position of the stitching member in the two moving channels can be changed.

In some embodiments, the pressing member includes a pressing portion and a moving portion, the pressing portion is cylindrical and is used for pressing the element to be welded on the component to be welded, an elastic member is disposed between the pressing portion and the lower pressing member, and the moving portion passes through the elastic member and is movably disposed in the moving channel. Therefore, the pressing part can generate elastic pressing effect on the element to be welded through the elastic force generated by the compression of the elastic piece.

In some embodiments, the moving portion penetrates through the lower pressing member through the moving channel, and a locking member is connected to an end of the moving portion penetrating through the lower pressing member, and the locking member is used for locking the position of the moving portion in the moving channel. Like this, conveniently set up the pressfitting spare on the casting die down to can lock the pressfitting spare through the locking piece and attach.

In some embodiments, the bearing member is provided with a plurality of first magnetic members, the pressing member is provided with positioning columns corresponding to the plurality of first magnetic members one to one, and each positioning column is embedded with a second magnetic member capable of attracting the corresponding first magnetic member. Like this, through set up the magnet of mutual actuation under between casting die and the carrier, play the effect of location direction to the casting die that pushes down, avoid pushing down the casting die and appear the skew at the in-process that pushes down.

In some embodiments, the number of the first magnetic members is four, and four first magnetic members are oppositely arranged on the bearing member in a group of two. Therefore, the suction force applied to the two sides of the pressing piece in the pressing process is uniform.

In some embodiments, an avoidance area is further disposed on the carrier, and the avoidance area is a region on the carrier that is recessed in a direction away from the lower pressing member. In this way, it is possible to give way to the partially protruding elements of the parts to be welded placed on the carrier to place the parts to be welded on the carrier smoothly.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a welding jig provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a welding jig according to an embodiment of the present disclosure when a component to be welded is placed on a carrier;

fig. 3 is a schematic cross-sectional structure diagram of a welding jig provided in the embodiment of the present application.

Reference numerals: 10. a carrier; 11. a load-bearing zone; 12. a first magnetic member; 13. an avoidance zone; 20. a push-down member; 21. a moving channel; 22. a positioning column; 23. a second magnetic member; 30. a pressing part; 31. a pressing part; 32. a moving part; 40. an elastic member; 50. a locking member; 60. a part to be welded; 70. the elements are to be welded.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The SMT is a process commonly used in the electronic assembly industry at present, and is widely applied to the circuit board welding process, and compared with the conventional plug-in type welding, the SMT has the characteristics of high assembly density, small electronic product volume, and light weight.

Taking the welding on the circuit board as an example, in the SMT processing process, firstly, the solder paste is printed on a bonding pad of the circuit board to prepare for the welding of components; and then, mounting the components at the fixed positions of the circuit board, melting the solder paste after the components are accurately mounted at the fixed positions of the circuit board, firmly bonding the surface-mounted components and the circuit board together, and finally removing the soldering flux on the assembled circuit board to complete the welding of the components and the circuit board.

Because the solder paste can generate gas when being melted, bubbles are generated between the circuit board and the mounted components, the welding effect between the components and the circuit board can be influenced, and the welding yield of the components and the circuit board is reduced.

In order to prevent bubbles from occurring between the components and the circuit board, at present, in the welding process, a pressure applying jig needs to be additionally arranged on a carrier of the circuit board, the components mounted on the circuit board are compressed through the pressure applying jig, and the gas between the circuit board and the mounted components is extruded to squeeze the gas generated in the welding process, so that the bubbles are prevented from being formed, and the mounting tightness between the components and the circuit board is ensured.

The applicant notices that although the existing welding jig can compress the mounted components on the circuit board, the welding jig is poor in universality, the pressure applying part in the welding jig can only compress the components at specific positions on the circuit board due to the fact that the relative position of the pressure applying part on the circuit board is fixed, if the type of the circuit board is changed or the layout of the components on the circuit board is adjusted, the welding jig cannot adapt to the welding requirement of the components after the positions are adjusted, the welding jig needs to be changed, and therefore the use cost of the welding jig is high. The relative position here refers to a projected position of the pressing portion onto the wiring board.

In order to improve the universality of the welding jig and reduce the use cost of the welding jig, the applicant finds that the pressing part in the welding jig can be movably arranged on the pressing jig, so that even if the type of a circuit board is changed or the layout of a component on the circuit board is adjusted, the pressing part in the welding jig can adapt to the compression of the component on the circuit board after the position is adjusted, and particularly, the pressing part pressed on the component in the welding jig can move on the pressing jig to adjust the position.

After the welding jig is adopted, for the welding of components on the circuit board of the same type, the pressing part in the welding jig can adapt to the pressing of the components in the welding process without adjusting the position, and for the welding of the components on the circuit boards of different types or the welding of the components on the circuit board after the layout of the components is adjusted, the pressing part in the welding jig can adjust the relative position on the circuit board according to the mounting position of the components so as to adapt to the pressing of the components on the circuit board again.

As shown in fig. 1 to 3, a welding jig provided by an embodiment of the present application includes a carrier 10 and a lower pressing member 20, where the carrier 10 is provided with a bearing area 11 for bearing a component 60 to be welded; the lower pressing piece 20 is arranged opposite to the bearing part 10, a pressing piece 30 is arranged on one side of the lower pressing piece 20 close to the bearing part 10, the pressing piece 30 is used for elastically pressing the element 70 to be welded on the part 60 to be welded, and the pressing piece 30 can move on the lower pressing piece 20 to change the relative position in the bearing area 11.

The carrier 10 is a part of the soldering jig where the carrier board waits for the soldering component 60, the carrier region 11 on the carrier 10 is a region where the component 60 to be soldered is placed, and the carrier region 11 may be designed to have different sizes according to the shape of the component 60 to be soldered.

The lower pressing member 20 is a part of the welding jig which is matched with the carrier 10 to press the element 70 to be welded, the pressing member 30 on the lower pressing member 20 is a part which presses the element 70 to be welded on the part 60 to be welded, and the lower pressing member 20 may be made of an elastic material or assembled with the lower pressing member 20 through the elastic member 40, so as to realize elastic pressing of the element 70 to be welded. The pressing element 30 is disposed on a side of the pressing member 20 close to the carrier 10, which means that a portion of the pressing element 30 pressed against the element 70 to be welded is located on a side pressed against the carrier 10, and a body of the pressing member 20 may be disposed on a side of the pressing member 20 close to the carrier 10, or may be disposed through the pressing member 20, so that a portion having a pressing effect is located on a side of the pressing member 20 close to the carrier 10.

The arrangement of the bearing part 10 can play a role of bearing the part 60 to be welded, the lower pressing part 20 is arranged opposite to the bearing part 10 and can be matched with the bearing part 10, the pressing part 30 can play a role of pressing and holding the element 70 to be welded placed on the part 60 to be welded, and meanwhile, the pressing part 30 can move on the lower pressing part 20 to change the relative position in the bearing area 11 of the bearing part 10, namely, the relative position on the part 60 to be welded, so that after the type of the part 60 to be welded is changed or the layout of elements on the part 60 to be welded is changed, the pressing and holding of the element 70 to be welded at different positions on the part 60 to be welded is adapted again, the universality of the welding jig is improved, and the use cost of the welding jig is reduced. The relative position here also refers to the projected position of the pressing element 30 into the carrying area 11.

In some embodiments of the present application, the pressing member 30 may be provided with a moving channel 21 on the lower pressing member 20, and the pressing member 30 may be moved on the lower pressing member 20 along the moving channel 21.

The moving channel 21 is a channel provided on the lower pressing member 20 and allowing the pressing member 30 to move, and the channel may be a movable groove provided on the lower pressing member 20, a portion of the pressing member 30 is located in the movable groove and can move on the lower pressing member 20 along the movable groove, the channel may also be a slit penetrating through the lower pressing member 20 along the pressing direction of the pressing member 30, a portion of the pressing member 30 may penetrate through the lower pressing member 20 through the slit, and a structure for preventing the pressing member 30 from falling off from the slit is provided, and the channel may also include a portion of the movable groove and a portion of the slit, which will not be described herein.

By the arrangement of the moving passage 21, the movement of the pressing member 30 on the pressing member 20 can be achieved, thereby changing the relative position on the parts to be welded 60 to accommodate the welding process of the parts to be welded 60 after changing the welding position of the elements to be welded 70.

In some embodiments of the present application, optionally, the moving channel 21 is linear, and there are a plurality of pressing members 30 in the moving channel 21.

The linear moving channel 21 indicates that the moving channel 21 is a straight line on the lower pressing member 20, that is, the moving track of the pressing member 30 on the lower pressing member 20 is a straight line, and the pressing member 20 in the moving channel 21 has a plurality of fingers, so that more than two pressing members 30 can be arranged in the moving channel.

By arranging the moving channel 21 in a linear type and arranging a plurality of pressing members 30 in the moving channel 21, the pressing of the elements 70 to be welded, in which the parts 60 to be welded are located at different positions on the same straight line, can be accommodated, thereby reducing the welding time and improving the welding efficiency.

In other possible embodiments, the moving channel 21 may be curved, that is, the moving track of the pressing member 30 on the pressing member 20 is curved to accommodate the pressing of the elements 70 to be welded at different positions of the parts 60 to be welded, which are not on the same straight line.

In some embodiments of the present application, there are optionally a plurality of moving channels 21, and the plurality of moving channels 21 are arranged in parallel.

The moving channel 21 has a plurality of finger pressing members 20 on which more than two moving channels 21 are distributed, the plurality of moving channels 21 are arranged in parallel until the plurality of moving channels 21 are parallel and not intersected, that is, the moving tracks of the pressing members 30 in different moving channels 21 are parallel.

The pressing of the elements 70 to be welded on the parts 60 to be welded in different linear directions can be accommodated by providing a plurality of moving channels 21 on the lower pressing member 20, for example, when it is required to weld the elements 70 to be welded simultaneously on opposite sides of the parts 60 to be welded, the pressing members 30 in two of the moving channels 21 on the lower pressing member 20 can be selected to press the elements 70 to be welded on the parts 60 to be welded.

In other possible embodiments, the plurality of moving channels 21 of the lower pressing member 20 may be arranged to intersect, which may be designed accordingly according to whether the welding positions on the parts to be welded 60 are located on the same line.

In some embodiments of the present application, optionally, two adjacent moving channels 21 communicate with each other.

The two moving passages 21 communicate with each other, which means that the pressing members 30 provided in the two moving passages 21 can be replaced with the moving passages 21 in which they are located.

By communicating two adjacent moving channels 21 with each other, the number of the pressing members 30 in each moving channel 21 can be adjusted to adapt to the pressing of the elements 70 to be welded at different numbers on the part 60 to be welded after the number of the elements 70 to be welded on the part 60 to be welded is changed (increased or decreased).

In other possible embodiments, two adjacent moving channels 21 may be separated from each other, which may be designed according to whether the number of the elements 70 to be welded on the part 60 to be welded is changed.

In some embodiments of the present application, optionally, the pressing member 30 includes a pressing portion 31 and a moving portion 32 connected to each other, the pressing portion 31 is cylindrical and is used for pressing the element 70 to be welded on the part 60 to be welded, an elastic member 40 is disposed between the pressing portion 31 and the lower pressing member 20, and the moving portion 32 passes through the elastic member 40 and is movably disposed in the moving channel 21.

The pressing part 31 is a part of the pressing piece 30 which has a pressing effect on the element 70 to be welded, and the pressing part is a cylindrical finger pressing part and has a cylindrical appearance; the elastic member 40 is arranged between the pressing part 31 and the lower pressing member 20, that is, one end of the elastic member 40 is connected with the lower pressing member 20, the other end of the elastic member 40 is connected with the pressing part 31 of the pressing member 30, and the elastic member 40 can be a spring or a disc spring; the moving portion 32 is a portion of the presser 30 that moves on the lower presser 20, where the movable finger moving portion 32 is movable on the lower presser 20 in a direction away from the carrier 10, and the moving portion 32 is movable on the lower presser 20 along the moving passage 21 to change the relative position within the loading area 11.

The cylindrical pressing part 31 can press the element 70 to be welded, the elastic force generated by the compression of the elastic member 40 can automatically adjust the pressure of the element 70 to be welded, and the relative position of the pressing member 30 on the part 60 to be welded can be changed by the movement of the moving part 32 on the lower pressing member 20.

In some embodiments of the present application, optionally, the moving portion 32 penetrates the lower pressure member 20 through the moving channel 21, and a locking member 50 is connected to an end of the moving portion 32 penetrating the lower pressure member 20, and the locking member 50 is used for locking the position of the moving portion 32 in the moving channel 21.

The moving portion 32 penetrates through the lower pressing member 20 through the moving channel 21, that is, the moving channel 21 is a slit formed on the lower pressing member 20, that is, the moving portion 32 penetrates through the lower pressing member 20 from the side of the lower pressing member 20 close to the carrier 10, and that the end of the moving portion 32 penetrating through the lower pressing member 20 is the end of the moving portion 32 away from the carrier 10.

The locking member 50 is a member for locking the position of the moving part 32 in the moving passage 21, and the locking member 50 may be a locking pin penetrating one end of the moving part 32 or a nut screwed to one end of the moving part 32.

The pressing member 30 can be conveniently arranged on the lower pressing member 20 by penetrating the moving part 32 through the lower pressing member 20, and the pressing member 30 can be movably arranged on the lower pressing member 20 along the moving channel 21 only by arranging a slit on the lower pressing member 20 and penetrating the pressing member 30 through the slit on the lower pressing member 20 and connecting the locking member 50.

In some embodiments of the present application, optionally, a plurality of first magnetic members 12 are disposed on the bearing member 10, positioning columns 22 corresponding to the plurality of first magnetic members 12 one to one are disposed on the lower pressing member 20, and a second magnetic member 23 capable of attracting the corresponding first magnetic member 12 is embedded on each positioning column 22.

The first magnetic member 12 and the second magnetic member 23 are magnetic members, such as magnets, which can attract each other, and the positioning column 22 is a column disposed on the pressing member 20.

Through setting up the magnet of mutual actuation between holding member 20 and the carrier 10, can play the effect of location direction to holding member 20 when setting up holding member 20 relatively on carrier 10, avoid holding member 20 to appear squinting in the process of pushing down.

In some embodiments of the present application, optionally, there are four first magnetic members 12, and four first magnetic members 12 are oppositely disposed on the carrier 10 in a group of two.

The four first magnetic members 12 are oppositely disposed on the carrier 10 in a group of two, which means that two of the four first magnetic members 12 are disposed on one side of the carrier 10 and the other two are disposed on the other side of the carrier 10.

By arranging four first magnetic members 12 and arranging the four first magnetic members 12 on the carrier 10 in a group of two, the attraction force applied to the two sides of the pressing member 20 during the pressing process can be more uniform.

In some embodiments of the present application, optionally, an avoidance area 13 is further disposed on the carrier 10, and the avoidance area 13 is an area of the carrier 10 recessed in a direction away from the lower pressing member 20.

By providing the relief area 13 on the carrier 10, a relief may be formed for a part of the protruding element of the component 60 to be welded placed on the carrier 10 to smoothly place the component 60 to be welded on the carrier 10.

In order to realize the light weight of the welding jig, the supporting member 10 and the pressing member 20 both adopt a flat plate form, two circuit boards to be welded can be placed on the supporting member 10 at the same time, two magnets are respectively arranged on two opposite sides of the supporting member 10, four moving channels 21 are arranged on the pressing member 20, two of the moving channels correspond to one circuit board to be welded, the other two moving channels correspond to the other circuit board to be welded, each moving channel 21 is linear, one end of the pressing member 30 penetrates through a spring and then penetrates through the pressing member 20 from one side of the pressing member 20 far away from the supporting member 10 through the moving channel 21, one end of the pressing member 30 penetrating through the pressing member 20 is connected with a nut to lock the pressing member 30 arranged in the moving channel 21, when the pressing member 20 is oppositely arranged on the supporting member 10, the pressing member 30 elastically presses the element 70 to be welded on the circuit board to be welded, so that welding of the two can be performed.

When the welding jig provided by the embodiment of the application is used, a circuit board to be welded is placed on the bearing part 10, then the element 70 to be welded is attached to the circuit board to be welded, then the pressing part 20 is taken down from top to bottom, and the magnet on the positioning column 22 and the magnet on the bearing part 10 are mutually adsorbed to perform positioning and fixing, at the moment, the pressing part 30 exerts elastic pressure towards the circuit board to be welded on the element 70 to be welded under the action of the spring, so that the situation that the element 70 to be welded has no offset or abnormal false welding in the subsequent welding process is ensured.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (10)

1. A welding jig, characterized by, includes:

the bearing part is provided with a bearing area used for bearing the part to be welded;

the lower pressing piece is arranged opposite to the bearing piece, one side of the lower pressing piece, close to the bearing piece, is provided with a pressing piece, the pressing piece is used for elastically pressing and holding the element to be welded on a part to be welded, and the pressing piece can move on the lower pressing piece so as to change the relative position in the bearing area.

2. The welding jig of claim 1, wherein:

the pressing piece is provided with a moving channel, and the pressing piece can move on the pressing piece along the moving channel.

3. The welding jig of claim 2, wherein:

the moving channel is linear, and the pressing piece in the moving channel is provided with a plurality of pressing pieces.

4. The welding jig of claim 3, wherein:

the moving channels are multiple and are arranged in parallel.

5. The welding jig of claim 4, wherein:

two adjacent moving passages communicate with each other.

6. The welding jig of claim 2, wherein:

the pressing part comprises a pressing part and a moving part which are connected, the pressing part is cylindrical and is used for pressing an element to be welded on a part to be welded, an elastic part is arranged between the pressing part and the pressing part, and the moving part penetrates through the elastic part and is movably arranged in the moving channel.

7. The welding jig of claim 6, wherein:

the removal portion warp removal passageway runs through the pushing down the piece, just the removal portion passes the one end of pushing down the piece is connected with the locking piece, the locking piece is used for locking the removal portion is in the position in the removal passageway.

8. The welding jig of claim 1, wherein:

the bearing part is provided with a plurality of first magnetic parts, the pressing part is provided with a plurality of positioning columns in one-to-one correspondence with the first magnetic parts, and each positioning column is embedded with a second magnetic part which can be attracted by the corresponding first magnetic part.

9. The welding jig of claim 8, wherein:

the number of the first magnetic parts is four, and the four first magnetic parts are oppositely arranged on the bearing part by taking two magnetic parts as a group.

10. The welding jig of any one of claims 1 to 9, wherein:

the bearing piece is further provided with an avoiding area, and the avoiding area is an area which is arranged on the bearing piece and is far away from the direction of the lower pressing piece and is sunken.

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