Laser penetration fusion welding method, welding jig, shielding case and electronic equipment

Abstract

The invention provides a laser penetration fusion welding method, a welding jig, a shielding cover and electronic equipment, and the laser penetration fusion welding method comprises the steps that a first workpiece and a second workpiece are stacked, and the first workpiece and the second workpiece have an overlapping area. Under a preset condition, a laser beam is controlled to irradiate the overlapping area to form a plurality of welding spots, so that the first workpiece and the second workpiece are welded; wherein when each welding spot is formed, the laser beam moves in the welding spot in a spiral path, and a plurality of laser irradiation spots are arranged on the spiral path. By means of the method, when each welding spot is formed, due to the fact that the laser beam irradiates the multiple irradiation spots in the spiral path, high-temperature heat dissipation is facilitated when the laser beam irradiates to form the welding spots, the deformation degree of the workpiece in the welding process is reduced, and the coplanarity of devices obtained through welding is effectively guaranteed. In addition, a molten pool formed by melting materials in a welding spot can have the uniform depth, and the welding strength of the first workpiece and the second workpiece is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of laser welding, and in particular to a laser deep-penetration welding method, a welding jig, a shielding cover and an electronic device. Background Art

[0002] In the process of mechanical manufacturing, two different workpieces are often fixedly connected by welding. For some precision equipment or instruments, there are high requirements for the coplanarity of the device surface after welding. For example, when the thickness of the workpiece to be welded is small, such as when two workpieces with a thickness of less than 1mm are partially stacked and welded, due to the small thickness of the workpiece, during the welding process, the workpiece is easily thermally deformed by the high temperature during welding, and it is difficult to ensure that the device surface has good coplanarity after welding, and the performance of the device is adversely affected. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a laser deep penetration welding method, a welding jig, a shielding cover and an electronic device.

[0004] According to a first aspect of the present disclosure, a laser deep penetration welding method is provided, the laser deep penetration welding method comprising:

[0005] Laying a first workpiece and a second workpiece in a stacked manner, wherein the first workpiece and the second workpiece have an overlapping area;

[0006] Under preset conditions, the laser beam is controlled to irradiate the overlapping area to form multiple welds, so that the first workpiece and the second workpiece are welded; wherein, when forming each of the welds, the laser beam moves in the weld in a spiral path, and multiple laser irradiation points are set on the spiral path.

[0007] In some embodiments of the present disclosure, the laser beam moves from the radial outer side of the welding spot to the radial inner side of the welding spot.

[0008] In some embodiments of the present disclosure, the distance between two welding points formed at two adjacent time points is the farthest.

[0009] In some embodiments of the present disclosure, when forming each of the weld spots, the distance between the bottom of the molten pool in the overlapping area and the contact interface between the first workpiece and the second workpiece is taken as the first distance, and the ratio of the first distance to the thickness of the overlapping area is 0.08-0.16.

[0010] In some embodiments of the present disclosure, the outer diameter of the welding spot is less than or equal to 0.5 mm; and / or,

[0011] The distance between two adjacent welding points is greater than or equal to 1.0 mm.

[0012] According to a second aspect of the present disclosure, a welding jig is provided, the welding jig comprising a base and a cover plate rotatably connected, the base comprising a first limiting portion and a plurality of second limiting portions arranged around the first limiting portion, the plurality of second limiting portions being used to limit a second workpiece; the first limiting portion comprising a groove, the groove being used to accommodate the first workpiece;

[0013] When the base and the cover are in a closed state, the cover is in contact with the second workpiece, so that the first workpiece and the second workpiece are stacked.

[0014] In some embodiments of the present disclosure, the bottom wall of the groove includes a through groove area and a bearing area, and the overlapping area formed by the first workpiece and the second workpiece corresponds to at least a portion of the position of the through groove area, and the through groove area is used to allow the laser beam to irradiate the overlapping area from the surface of the base on the side away from the groove.

[0015] In some embodiments of the present disclosure, an elastic member is disposed inside the bearing area, and the elastic member is used to press the second workpiece and the first workpiece on the bearing area to form a stacked arrangement when the base and the cover are in a closed state.

[0016] According to a third aspect of the present disclosure, a shielding cover is provided, comprising a first workpiece and a second workpiece connected by welding, and the shielding cover is manufactured by the laser deep penetration welding method provided by the first aspect of the present disclosure.

[0017] In some embodiments of the present disclosure, the shielding cover includes a shielding cover body and a shielding patch, the shielding cover body is provided with an opening, the shielding patch covers the opening and has an overlapping area with the shielding cover body, and one of the first workpiece and the second workpiece is the shielding cover body, and the other is the shielding patch.

[0018] According to a fourth aspect of the present disclosure, an electronic device is provided, wherein the electronic device comprises the shielding cover provided by the third aspect of the present disclosure.

[0019] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure adopts a laser deep penetration welding method to form multiple welding spots in the overlapping area formed by the first workpiece and the second workpiece. When forming each welding spot, since the laser beam irradiates multiple irradiation points in a spiral path, it is beneficial to dissipate the high temperature when the laser beam irradiates the welding spot, reduce the deformation of the workpiece during the welding process, and effectively ensure the coplanarity of the device obtained by welding. In addition, the molten pool formed by the melting of the material in the welding spot can also have a uniform depth, thereby improving the welding strength of the first workpiece and the second workpiece.

[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 The figure is a flow chart of a laser deep penetration welding method according to an exemplary embodiment.

[0023] Figure 2 is a schematic diagram showing welding of a first workpiece and a second workpiece according to an exemplary embodiment.

[0024] Figure 3 is a schematic diagram showing a spiral path of a laser beam within a welding spot according to an exemplary embodiment.

[0025] Figure 4 is a schematic diagram showing welding of a first workpiece and a second workpiece according to another exemplary embodiment.

[0026] Figure 5 is a cross-sectional view showing welding of a first workpiece and a second workpiece according to an exemplary embodiment.

[0027] Figure 6 is a schematic diagram of a welding jig according to an exemplary embodiment.

[0028] Figure 7 is a schematic diagram of a base of a welding jig according to an exemplary embodiment.

[0029] Figure 8 is a schematic diagram of a shielding cover according to an exemplary embodiment.

[0030] Fig. 9 is a schematic diagram of a shielding cover according to another exemplary embodiment. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0032] In the process of mechanical manufacturing, two different workpieces are often fixedly connected by welding. For some precision equipment or instruments, there are high requirements for the coplanarity of the device surface after welding. For example, when the thickness of the workpiece to be welded is small, such as when two workpieces with a thickness of less than 1mm are partially stacked and welded, due to the small thickness of the workpiece, during the welding process, the workpiece is easily thermally deformed by the high temperature during welding, and it is difficult to ensure that the device surface has good coplanarity after welding, and the performance of the device is adversely affected.

[0033] Laser deep penetration welding technology has the advantages of fast welding speed, low heat input, high weld strength, and high processing accuracy. Laser deep penetration welding technology is often used to weld workpieces to meet the coplanarity requirements of the device. When forming a weld point, the laser beam continuously irradiates a certain point in the overlapping area of ​​the two workpieces to form a small hole. The material in the small hole melts. After the laser is removed, the molten material solidifies to weld the two workpieces together. However, the continuous irradiation of the laser beam can easily cause the temperature near the small hole to be too high, resulting in thermal deformation of the workpiece, which has an adverse effect on the coplanarity of the device. At the same time, the shape of the small hole-shaped molten pool when the material is molten is similar to an inverted cone. The effective welding part may only be the tip of the inverted cone, and the welding strength cannot be guaranteed.

[0034] In view of this, the present disclosure provides a laser deep penetration welding method, in which a plurality of welding spots are formed in the overlapping area formed by the first workpiece and the second workpiece. When forming each welding spot, since the laser beam irradiates the plurality of irradiation points in a spiral path, it is beneficial to dissipate the high temperature when the laser beam irradiates the welding spot, reduces the deformation of the workpiece during the welding process, and effectively ensures the coplanarity of the device obtained by welding. In addition, the molten pool formed by the melting of the material in the welding spot can have a uniform depth, thereby improving the welding strength of the first workpiece and the second workpiece.

[0035] An exemplary embodiment of the present disclosure provides a laser deep penetration welding method, referring to Figure 1 As shown, Figure 1 1 is a flow chart of a laser deep penetration welding method according to an exemplary embodiment. The laser deep penetration welding method includes the following steps:

[0036] Step S101, stacking a first workpiece and a second workpiece, wherein the first workpiece and the second workpiece have an overlapping area;

[0037] Step S102, under preset conditions, control the laser beam to irradiate the overlapping area to form multiple welds, so that the first workpiece and the second workpiece are welded; wherein, when forming each weld, the laser beam moves in a spiral path within the weld, and multiple laser irradiation points are set on the spiral path.

[0038] In step S101, before welding the workpiece, refer to Figure 2 As shown, the first workpiece 10 and the second workpiece 20 to be welded are stacked so that the first workpiece 10 and the second workpiece 20 have an overlapping area 30, and the overlapping area 30 includes a partial area of ​​the first workpiece 10 and a partial area of ​​the second workpiece 20. The overlapping area 30 is the area used for subsequent welding. The first workpiece 10 and the second workpiece 20 can be workpieces made of metal materials, for example, they can be workpieces formed of metal materials such as iron, aluminum, copper, iron alloy, aluminum alloy, copper alloy, etc. The first workpiece 10 and the second workpiece 20 can be sheet materials or plate materials. The shapes and materials of the first workpiece 10 and the second workpiece 20 can be the same or different.

[0039] In step S102, refer to Figure 2 and Figure 3 As shown, the preset conditions may be parameters such as focal length, laser power density, spot diameter, laser moving speed, etc. when laser beam is used for welding. The preset conditions may be reasonably adjusted based on the thickness of the overlapping area 30, and the present disclosure does not limit them. It should be noted that since the laser deep melting welding technology is adopted in this embodiment, the power density of the laser beam should be greater than 10 6 W / cm 2 At the same time, since the laser beam has a spiral moving path in each welding spot 40, the spot diameter of the laser beam should be controlled to be as small as possible, so as not to expand the outer diameter of the welding spot 40 when the laser beam moves along the spiral path 50, and reduce the thermal deformation of the first workpiece 10 and the second workpiece 20 caused by the laser beam during welding. In this embodiment, there is no restriction on the wavelength of the laser beam, and there is no restriction on the type of medium forming the laser beam, for example, it can be solid, gas, liquid, etc. In some examples, a gas such as an inert gas or carbon dioxide can be used as a medium to excite and form a laser beam.

[0040] Under preset conditions, the laser beam irradiates the overlapping area 30 to form a weld 40 in the overlapping area 30. In the process of laser beam irradiation to form the weld 40, for example, taking the incident surface of the laser beam as the surface of the first workpiece 10, since the laser power input is much greater than the heat conduction, convection and radiation heat dissipation rate of the laser, the surface material of the overlapping area 30 corresponding to the first workpiece 10 is irradiated by the laser beam to be vaporized, and small holes are formed on the surface of the first workpiece 10. The small holes can completely absorb the laser energy of the laser beam irradiation process, so that the metal material around the cavity is melted. The pressure of the high-temperature vaporized material vapor in the cavity forms a dynamic balance with the surface tension of the liquid molten material in a flowing state around the cavity. The molten metal material in the cavity is in a continuous and stable molten state, that is, it forms a hole as shown in the figure. Figure 5As the laser beam continues to irradiate, the depth of the small hole gradually penetrates the first workpiece 10 and causes the material at the corresponding position of the second workpiece 20 to be in a molten state, and the bottom of the molten pool 42 is located somewhere inside the second workpiece 20. When the laser beam stops irradiating or moves away from the cavity, the molten metal material fills the cavity and cools and solidifies to form a weld 40. The laser beam forms a plurality of welds 40 in the overlapping area 30, so that the first workpiece 10 and the second workpiece 20 can be fixedly connected.

[0041] In this embodiment, when the laser beam is irradiated to form each welding point 40, reference Figure 3 As shown, in the horizontal direction, the moving path of the laser beam in the weld 40 to be formed is spiral, that is, the laser beam moves in the weld along the spiral path 50, and the laser beam can move from the center of the weld 40 to the radial outside of the weld 40, or from the radial outside of the weld 40 to the radial inside of the weld 40. Compared with the prior art in which the laser beam continuously irradiates a certain point to form the weld 40, part of the heat can be dissipated during the movement of the laser beam along the spiral path 50, which can avoid the heat convection and heat radiation generated by the laser beam from being concentrated at a certain point, causing the first workpiece 10 and / or the second workpiece 20 to be deformed by severe thermal stress, thereby ensuring the coplanarity of the first workpiece 10 and the second workpiece 20 after welding.

[0042] When the laser beam moves along the spiral path 50, the laser beam may briefly stop at multiple positions on the spiral path 50, and the position where the laser beam stops is the laser irradiation point 41. Figure 3 and Figure 5 The multiple laser irradiation points 41 can make the molten pool 42 formed by the laser beam irradiation similar to a cylinder, rather than the molten pool similar to an inverted cone formed by continuous irradiation of a certain point in the prior art, so as to improve the welding strength of the formed weld 40, thereby ensuring the welding stability of the first workpiece 10 and the second workpiece 20.

[0043] The method provided in this embodiment can be applied to the case where the thickness of the welded workpiece is small, for example, the first workpiece 10 and / or the second workpiece 20 can be a metal sheet with a thickness of less than 1 mm. Since the thickness of the first workpiece 10 and / or the second workpiece 20 is small, the first workpiece 10 and / or the second workpiece 20 are more susceptible to heat convection and heat radiation, resulting in loss of coplanarity. The method provided in this embodiment can ensure that the first workpiece 10 and the second workpiece 20 have good coplanarity and welding strength after welding. In some examples that have been practiced, the thickness of the first workpiece 10 and the second workpiece 20 can be between 0.1-0.2 mm. For example, when the thickness of the first workpiece 10 is 0.1 mm and the thickness of the second workpiece 20 is 0.15 mm, the coplanarity of the first workpiece 10 and the second workpiece 20 after welding is 0.08 mm, which has good coplanarity.

[0044] For example, reference Figure 4 As shown, the outer diameter a of the weld 40 can be controlled to be less than or equal to 0.5 mm, for example, it can be 0.5 mm, 0.48 mm, 0.45 mm, etc. If the outer diameter of the weld 40 is too large, the laser beam needs to continuously irradiate the weld 40 for a long time, or has a long moving path in the weld 40, and the first workpiece 10 and / or the second workpiece 20 are prone to large thermal deformation. The outer diameter a of the weld 40 is controlled not to exceed 0.5 mm to ensure that the first workpiece 10 and the second workpiece 20 have good welding strength and coplanarity.

[0045] Continue to refer Figure 4 When a plurality of welding spots 40 are formed in the overlapping region 30, the spacing b between two adjacent welding spots 40 is controlled to be greater than or equal to 1.0 mm, for example, it can be 1.0 mm, 1.1 mm, 1.2 mm, etc. If the arrangement of the welding spots 40 is too dense, it is easy to cause the thermal stress concentration in the overlapping region 30, affecting the strength of the material itself and the welding strength between the first workpiece 10 and the second workpiece 20.

[0046] In an exemplary embodiment, reference Figure 2 and Figure 3As shown, in the process of the laser beam moving along the spiral path 50 to form the weld 40, the laser beam moves from the outside to the inside of the spiral path 50, so that the heat source provided by the laser beam moves from the edge of the weld 40 to the center of the weld 40. Since the spiral path 50 is set in the weld 40, that is, the laser beam moves from the radial outside of the weld 40 to the radial inside of the weld 40 during the movement. Compared with the moving direction of the laser beam from the radial inside of the weld 40 to the radial outside of the weld 40, in the process of the laser beam moving from the radial outside of the weld 40 to the radial inside of the weld 40, the heat provided by the laser beam to the weld 40 can be effectively dissipated from the radial outside direction of the weld 40. The laser beam moves in such a direction along the spiral path 50 to form a plurality of welds 40 in the overlapping area 30 of the first workpiece 10 and the second workpiece 20, so that the heat dissipation efficiency of the material can be improved without affecting the melting of the material, so as to reduce the thermal deformation of the first workpiece 10 and / or the second workpiece 20 during the welding process.

[0047] In an exemplary embodiment, reference Figure 4 As shown, when the laser beam irradiates the overlapping area 30 of the first workpiece 10 and the second workpiece 20, only one laser beam can be used to irradiate multiple positions of the overlapping area 30 to form multiple welds 40. That is to say, the multiple welds 40 are not formed by using multiple laser beams to simultaneously irradiate the overlapping area 30, so as to avoid the overlapping area 30 being subjected to a large amount of heat provided by the laser beam, and to avoid the situation where the heat dissipation is not timely and the workpieces undergo severe thermal deformation.

[0048] In the process of using a laser beam to irradiate the overlapping area 30 to form a plurality of weld spots 40, according to the time sequence of forming the plurality of weld spots 40, the distance between two weld spots 40 formed at two adjacent time points is the farthest, so that the workpiece can more fully dissipate the heat when the weld spots 40 are formed, avoid the concentration of thermal stress in the overlapping area 30, and reduce the degree of thermal deformation of the material. Figure 4 , the overlapping region 30 is exemplarily rectangular, and when the first weld spot 40 formed is located in the upper left direction of the overlapping region 30, the laser beam should move to the lower right direction of the overlapping region 30, and form the second weld spot 40 in the diagonal direction of the first weld spot 40. After forming the second weld spot 40, the laser beam should move to the lower left direction of the overlapping region 30, and form the third weld spot 40 below the first weld spot 40, and then the laser beam moves to the upper right direction of the overlapping region 30, and forms the fourth weld spot 40 above the second weld spot 40. And so on, to form multiple weld spots 40 in the overlapping region 30, it should be noted that the ...th weld spot 40 in the above description refers to the time sequence of forming the weld spots 40.

[0049] It is understandable that the overlapping region 30 may be of a regular shape or an irregular shape based on the shapes of the first workpiece 10 and the second workpiece 20, or based on the relative positions of the first workpiece 10 and the second workpiece 20. Not limited to the shape of the overlapping region 30, when a plurality of welding spots 40 are formed in the overlapping region 30, it is ensured that the distance between the two welding spots formed at two adjacent time points is the farthest, so that the welded workpiece can dissipate heat as well as possible, and avoid the concentration of thermal stress in a certain area of ​​the welded workpiece.

[0050] In an exemplary embodiment, reference Figure 3 and Figure 5 As shown, a laser beam irradiates an overlapping area 30 formed by a first workpiece 10 and a second workpiece 20 to form a plurality of weld spots 40 in the overlapping area 30. Taking the formation of one of the weld spots 40 as an example, during the irradiation of the laser beam, the material at the position irradiated by the laser beam is vaporized by high temperature to form a small hole. With the continuous irradiation of the laser beam, the pressure of the vapor of the material vaporized by high temperature in the hole cavity and the surface tension of the liquid molten material in a flowing state around the hole cavity form a dynamic balance, forming a molten pool 42 corresponding to the weld spot 40.

[0051] Figure 5 4 shows a molten pool 42 formed by irradiating the surface of the first workpiece 10 with a laser beam. The depth of the molten pool 42 should be greater than the thickness of the first workpiece 10, that is, part of the material of the second workpiece 20 is also in a vaporized and molten state, so that the weld 40 formed after the molten pool 42 solidifies welds the first workpiece 10 and the second workpiece 20. When forming each weld 40, the distance between the bottom of the molten pool 42 corresponding to each weld 40 and the contact interface between the first workpiece 10 and the second workpiece 20 is taken as the first distance c, which is the height of the molten pool 42 inside the second workpiece 20. If the value of the first distance c is too small, it is easy to cause the welding strength between the first workpiece 10 and the second workpiece 20 to be low, and the reliability of the welded workpiece is low. If the value of the first distance c is too large, although the welding strength will also be improved, the degree of improvement is low, and at the same time, the heat concentration in the overlapping area 30 will be greatly increased, and the degree of thermal deformation of the material will be increased. Therefore, in order to ensure the welding strength between the first workpiece 10 and the second workpiece 20 and the coplanarity of the device after welding, the ratio between the first distance c and the thickness d of the overlapping area 30 can be controlled to be any value between 0.08-0.16, for example, it can be 0.08, 0.11, 0.16, etc. In some examples, when the thickness d of the overlapping area 30 is 2.5 mm, the first distance c can be any value between 20 μm and 40 μm.

[0052] An exemplary embodiment of the present disclosure further provides a welding jig, which can be used to stack the first workpiece and the second workpiece to be welded in the above embodiment, and determine the overlapping area for laser beam irradiation. Figure 6 As shown, Figure 6 It is a structural schematic diagram of a welding jig according to an exemplary embodiment. The welding jig 100 includes a base 11 and a cover 12 that are rotatably connected. The two can be rotatably connected by a rotating connection such as a rotating shaft, a hinge, or a hinge, so that the base 11 and the cover 12 can be converted between an expanded state and a closed state.

[0053] The base 11 is provided with a first limiting portion 13 and a plurality of second limiting portions 14 arranged around the first limiting portion 13. The first limiting portion 13 is provided as a groove 131. The groove 131 is used to accommodate the first workpiece. For example, the area of ​​the groove 131 may be equal to the area of ​​the first workpiece, and the height of the groove 131 may be less than, equal to, or greater than the thickness of the first workpiece. The groove 131 may be directly provided on the surface of the base 11, or a boss with a tiny protrusion may be provided on the surface of the base 11, and the groove 131 may be provided at a position corresponding to the boss, so that the position of the first workpiece may be closer to the position of the second workpiece. The second limiting portion 14 may be provided as a stopper or a baffle, and the plurality of second limiting portions 14 may all contact the edge of the second workpiece to limit the second workpiece. It can be understood that openings or grooves can be set at positions on the cover 12 corresponding to the multiple second limiting portions 14, so that when the cover 12 and the base 11 are subsequently closed, the second limiting portions 14 are inserted into the openings or grooves, and the second workpiece limited by the second limiting portions 14 can fit with the cover 12.

[0054] When the first workpiece and the second workpiece are placed in the welding jig 100, the first workpiece is placed in the groove 131 of the first limiting portion 13, and the second workpiece covers the first workpiece and is limited by the plurality of second limiting portions 14. The cover plate 12 is fitted with the base 11, the base 11 and the cover plate 12 are in a closed state, and the cover plate 12 is fitted with the second workpiece, so that the first workpiece and the second workpiece are stacked to determine the overlapping area of ​​the first workpiece and the second workpiece. Of course, it can be understood that a slightly convex boss can be set at a position corresponding to the groove 131 on the cover plate 12, so that when the base 11 and the cover plate 12 are in a closed state, the boss can make the first workpiece and the second workpiece be fully pressed and fit.

[0055] In some possible implementations, reference Figure 7 As shown, Figure 7is a schematic diagram of the base. When the first workpiece and the second workpiece are placed on the base 11, the area corresponding to the groove 131 is the overlapping area of ​​the first workpiece and the second workpiece. Since the laser beam needs to irradiate the overlapping area to form multiple welds, a through groove area 132 and a bearing area 133 can be set in the bottom wall of the groove 131. The bearing area 133 is used to bear the first workpiece, and the through groove area 132 is set based on the position where the weld is required to be formed. The through groove area 132 is a through groove in the groove 131 that passes through the base 11. When forming a weld, the laser beam can irradiate the overlapping area from the side surface of the base 11 away from the groove 131 through the through groove area 132. Since the first workpiece is placed in the groove 131, the laser beam irradiates the surface of the first workpiece to form a weld. When only a weld needs to be formed at a part of the overlapping area, the through groove area 132 can correspond to a part of the overlapping area, or the through groove area 132 corresponds to all the positions of the overlapping area, so that the weld is formed only at a part of the overlapping area by controlling the moving path of the laser beam. When it is necessary to form solder joints at all or most of the positions in the overlapping area, the through-groove area 132 may be arranged to correspond to all positions in the overlapping area.

[0056] Figure 7 The welding jig 100 shown in the figure can be used to weld a first workpiece with a smaller area to a second workpiece with a larger area. The area of ​​the second workpiece corresponding to the position of the bearing area 133 can be provided with an opening, so that the overlapping area of ​​the first workpiece and the second workpiece corresponds to the position of the annular through-groove area 132, that is, the overlapping area is annular. The second workpiece may not be provided with an opening, and the overlapping area of ​​the first workpiece and the second workpiece corresponds to the groove 131. In order to avoid large thermal deformation when welding the first workpiece with a smaller area, a welding spot can be formed only on the radial outer side of the first workpiece, that is, an annular through-groove area 132 is provided on the radial outer side of the bottom wall of the groove 131.

[0057] For example, reference Figure 6 and Figure 7 As shown, an elastic member may be provided inside the bearing area 133, and the elastic member may be a spring or an elastic pressure block. When the base 11 and the cover plate 12 are in an unfolded state, the elastic member is in a compressed state, and the bearing area 133 carries the first workpiece. When the base 11 and the cover plate 12 are in a closed state, the elastic member relaxes, and the elastic member pushes the surface of the bearing area 133, and compresses the first workpiece and the second workpiece placed in the bearing area 133, so that the first workpiece and the second workpiece are stacked and an overlapping area is determined. In this way, the laser beam is irradiated from the through groove area 132 to the overlapping area to form a welding spot.

[0058] An exemplary embodiment of the present disclosure further provides a shielding cover, referring to Figure 8As shown, the shielding cover 200 is often used to shield electromagnetic interference sources such as circuit elements, chips, etc. that emit electromagnetic radiation in electronic equipment to prevent the spread of electromagnetic radiation from affecting the normal functions of other components. At the same time, it can also shield external electromagnetic radiation from interfering with components in the electronic equipment. The shielding cover 200 is formed of metal, such as copper, iron, iron alloy, copper alloy, etc. The shape of the shielding cover 200 can be a closed three-dimensional structure with a cavity, or an opening is set on one side surface of the closed three-dimensional structure, and the opening is combined with the surface of the electronic equipment where the electromagnetic interference element is set to surround or cover the electromagnetic interference source. In the production process of the shielding cover 200, multiple metal sheets or metal plates need to be welded to form a shielding cover 200 that meets the requirements. During the manufacturing process of the shielding cover 200, overlapping areas need to be provided between the plates or sheets for welding. The shielding cover 200 is manufactured by the laser deep melting welding method provided in the above embodiment of the present disclosure, so that the formed shielding cover 200 has good reliability and coplanarity. Good coplanarity can reduce the volume occupied by the shielding cover 200 in the electronic device, which is conducive to reducing the volume of the electronic device and improving the portability of the electronic device. For example, Figure 8 The shielding cover 200 shown in the figure has an opening, and the shielding cover 200 includes a first workpiece 10 and a second workpiece 20 connected by welding. The first workpiece 10 can be the bottom wall of the shielding cover 200, and the second workpiece 20 is the frame of the shielding cover 200. The laser beam irradiates the overlapping area of ​​the first workpiece 10 and the second workpiece 20 to form the shielding cover 200.

[0059] In some examples, when the internal space of the shielding cover 200 does not meet the height of one or more EMI components, the shielding cover 200 is likely to collide with the EMI component, causing the EMI component to be damaged, or come into contact with the EMI component, causing the EMI component to short-circuit. Fig. 9 As shown, in order to save the volume occupied by the shielding cover 200 in the electronic device and to electromagnetically shield the electromagnetic interference element at the same time, the area of ​​the shielding cover body that is easy to collide or contact with the electromagnetic interference element is removed, that is, an opening 201 is formed, and the opening 201 can avoid the electromagnetic interference element. Further, in order to ensure the function of the shielding cover 200, a shielding patch is set on the surface of the shielding cover body corresponding to the opening 201. The shielding patch can be a steel sheet or a copper sheet. The shielding patch covers the opening 201 and has an overlapping area 30 with the shielding cover body. The overlapping area 30 is welded using the method provided in the above embodiment of the present disclosure to form the shielding cover 200.

[0060] Since the shielding cover 200 has good coplanarity, the opening 201 of the shielding cover body provides a space for accommodating the electromagnetic interference element without increasing the volume of the shielding cover 200, and at the same time, the electromagnetic interference element is well shielded. When the shielding cover 200 includes a shielding cover body and a shielding patch, one of the first workpiece 10 and the second workpiece 20 is the shielding cover body, and the other is the shielding patch. Fig. 9 In the shielding cover 200 shown, the first workpiece 10 is a shielding patch, and the second workpiece 20 is a shielding cover body. In the process of forming the shielding cover 200, the welding jig provided in the above embodiment of the present disclosure can be used for welding.

[0061] In an exemplary embodiment, the present disclosure further provides an electronic device, which may include, for example, a mobile phone, a tablet computer, a watch, etc. The electronic device includes the shielding cover provided in the above embodiment, and the shielding cover shields the electromagnetic radiation emitted by electromagnetic interference elements such as circuit elements and chips in the electronic device, and can also prevent the external electromagnetic radiation from affecting the circuit elements, chips, etc. Since the shielding cover has good welding strength and coplanarity, the volume occupied by the shielding cover in the electronic device can be reduced, which is conducive to improving the portability of the electronic device.

[0062] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in this disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0063] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A laser deep penetration welding method, characterized in that: The laser deep penetration welding method comprises: Laying a first workpiece and a second workpiece in a stacked manner, wherein the first workpiece and the second workpiece have an overlapping area; Under preset conditions, the laser beam is controlled to irradiate the overlapping area to form multiple welds, so that the first workpiece and the second workpiece are welded; wherein, when forming each of the welds, the laser beam moves in the weld in a spiral path, and multiple laser irradiation points are set on the spiral path.

2. The laser deep penetration welding method according to claim 1, characterized in that: The laser beam moves from the radial outer side of the welding spot to the radial inner side of the welding spot.

3. The laser deep penetration welding method according to claim 1, characterized in that: The distance between the two welding points formed at two adjacent time points is the farthest.

4. The laser deep penetration welding method according to claim 1, characterized in that: When forming each of the welding spots, the distance between the bottom of the molten pool in the overlapping area and the contact interface between the first workpiece and the second workpiece is taken as the first distance, and the ratio of the first distance to the thickness of the overlapping area is 0.08-0.

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5. The laser deep penetration welding method according to claim 1, characterized in that: The outer diameter of the welding spot is less than or equal to 0.5 mm; and / or, The distance between two adjacent welding points is greater than or equal to 1.0 mm.

6. A welding jig, characterized in that: The welding fixture comprises a base and a cover plate which are rotatably connected, the base is provided with a first limiting portion and a plurality of second limiting portions arranged around the first limiting portion, the plurality of second limiting portions are used to limit the second workpiece; the first limiting portion comprises a groove, the groove is used to accommodate the first workpiece; When the base and the cover are in a closed state, the cover is in contact with the second workpiece, so that the first workpiece and the second workpiece are stacked.

7. The welding jig according to claim 6, characterized in that: The bottom wall of the groove includes a through groove area and a bearing area. The overlapping area formed by the first workpiece and the second workpiece corresponds to at least part of the position of the through groove area. The through groove area is used to allow the laser beam to irradiate the overlapping area from the surface of the base facing away from the groove.

8. The welding jig according to claim 7, characterized in that: An elastic member is disposed inside the bearing area, and the elastic member is used to press the second workpiece and the first workpiece on the bearing area tightly to form a stacked arrangement when the base and the cover are in a closed state.

9. A shielding cover, characterized in that: The shielding cover comprises a first workpiece and a second workpiece connected by welding, and the shielding cover is manufactured by the laser deep penetration welding method according to any one of claims 1 to 5.

10. The shielding cover according to claim 9, characterized in that: The shielding cover comprises a shielding cover body and a shielding patch, the shielding cover body is provided with an opening, the shielding patch covers the opening and has an overlapping area with the shielding cover body, one of the first workpiece and the second workpiece is the shielding cover body, and the other is the shielding patch.

11. An electronic device, characterized in that: The electronic device comprises the shielding cover according to claim 9 or 10.

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