CN115365596A - Welding method and welding system based on blue laser - Google Patents
Welding method and welding system based on blue laser Download PDFInfo
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- CN115365596A CN115365596A CN202110540806.XA CN202110540806A CN115365596A CN 115365596 A CN115365596 A CN 115365596A CN 202110540806 A CN202110540806 A CN 202110540806A CN 115365596 A CN115365596 A CN 115365596A
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- 238000003466 welding Methods 0.000 title claims abstract description 178
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 156
- 229910052751 metal Inorganic materials 0.000 claims abstract description 156
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- 239000010949 copper Substances 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
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- 229910000881 Cu alloy Inorganic materials 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/005—Soldering by means of radiant energy
- B23K1/0056—Soldering by means of radiant energy soldering by means of beams, e.g. lasers, E.B.
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
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Abstract
The invention belongs to the technical field of laser welding, and relates to a welding method and a welding system based on blue laser, which comprises the following steps: preparing a target metal film with N hollow patterns; installing two metal pieces to be welded, between which a welding seam is formed, on a welding platform, arranging a target metal film, and enabling the target metal film to be positioned above the metal pieces to be welded; starting a blue laser, adjusting the output energy of the blue laser according to the target requirement, and aligning a blue laser beam emitted by the blue laser to one of the hollow patterns to serve as a target hollow pattern; and heating the target hollow pattern through the blue laser beam, so that the metal at the corresponding position of the target hollow pattern is molten into a molten drop until the molten drop is separated from the target metal film and drops to the welding line, and finally, welding and connecting the two metal parts to be welded together. Obviously, the welding method is simple and reliable, has wide application range, can meet the welding requirements of high current, high temperature resistance and high integration level, and has a simple welding system structure.
Description
Technical Field
The invention relates to the technical field of laser welding, in particular to a welding method and a welding system based on blue laser.
Background
With the rapid development of power electronics industries such as automobile electronics, 5G communication base stations, power electronic equipment and the like, a highly reliable packaging interconnection technology has become one of the key technologies for promoting the popularization and application of high-power devices. Such electronic devices have significant features of high integration, high current/high voltage, high temperature service, etc., and require smaller size of package interconnect joints, better high temperature stability, and higher reliability. However, for the connection between electronic components with large current, it is usually necessary to utilize the advantages of high current carrying capacity and good heat dissipation of high-reflectivity materials such as copper, copper alloy, and gold, which involves the problem of soldering of the high-reflectivity materials.
At present, in view of the characteristics of high absorption rate of blue light and high heating speed of high-reflective materials, blue laser is used for welding the high-reflective materials. However, in the prior art, semiconductor blue laser and fiber laser are generally integrated into a composite welding device for welding, that is, the overall structure and welding process of the existing welding device with blue laser welding function are relatively complex.
In addition, there is also a case that the blue laser is independently applied to the conventional laser soldering process to solve the soldering defect caused by the difference of the high-reflection material and the solder paste in the soldering requirement, but the process is still based on the conventional laser soldering process, obviously, the process is difficult to meet the requirements of high-power electronic devices on high-temperature stability, large current and high integration, and the application range is limited.
Disclosure of Invention
The embodiment of the invention aims to solve the technical problems that the structure and the process of the existing welding system with the blue light welding function for high-reflection materials are complex, the application range is limited, and the requirements on high-temperature stability, large current and high integration are difficult to meet.
In order to solve the above technical problems, an embodiment of the present invention provides a welding method based on blue laser, which adopts the following technical solutions:
the welding method based on the blue laser comprises the following steps:
preparing a target metal film with N hollow patterns, wherein N is a positive integer greater than or equal to 1;
installing two metal pieces to be welded, between which a welding line is formed, on a welding platform, arranging the target metal film, and enabling the target metal film to be positioned above the metal pieces to be welded;
starting a blue laser, adjusting the output energy of the blue laser according to target requirements, and aligning a blue laser beam emitted by the blue laser to one of the hollow patterns to serve as a target hollow pattern;
and heating the target hollow pattern through a blue laser beam, so that the metal at the corresponding position of the target hollow pattern is melted into a molten drop until the molten drop is separated from the target metal film and drops to the welding line, and finally, welding and connecting the two metal pieces to be welded together.
Further, in a preferable scheme of some embodiments, the number of the target hollow-out patterns is M, M is a positive integer greater than or equal to 1, and M is less than or equal to N;
and when M is larger than 1, heating the Mth target hollow pattern by the blue laser beam, and executing after molten drops formed by the Mth-1 target hollow pattern drop to the welding seam.
Further, in a preferred scheme of some embodiments, the hollow patterns are arranged in a gap and array manner.
Further, in a preferable scheme of some embodiments, the hollowed-out pattern is a structure with a solid pattern in the center and hollowed-out at the periphery of the center.
Further, in a preferable scheme of some embodiments, the solid pattern in the center of the hollow pattern is circular or square, and the periphery of the center is a cross hollow structure.
Further, in a preferred scheme of some embodiments, the step of mounting two metal parts to be welded, between which a weld is formed, on a welding platform, setting the target metal film, and positioning the target metal film above the metal parts to be welded specifically includes the following steps:
mounting two metal pieces to be welded on a welding platform capable of moving horizontally;
arranging the target metal film on a mounting rack capable of moving horizontally and/or up and down above the metal piece to be welded;
or specifically comprises the following steps:
disposing the target metal film on a mount frame that can be moved horizontally and/or up and down;
and mounting two metal pieces to be welded on a welding platform which can move horizontally below the target metal film.
Further, in a preferable version of some embodiments, the two metal pieces to be welded are made of a highly reflective metal material.
In order to solve the above technical problem, an embodiment of the present invention further provides a welding system based on a blue laser, which adopts the following technical solutions: the welding system based on the blue laser is used for implementing the welding method based on the blue laser, and comprises:
a blue laser for emitting a blue laser beam;
the welding platform is used for installing two metal pieces to be welded and driving the metal pieces to be welded to move horizontally;
the mounting frame is positioned above the welding platform and is used for mounting a target metal film and driving the target metal film to horizontally and/or vertically move;
and the control device is electrically connected with the blue laser, the welding platform and the mounting rack.
Further, in a preferred version of some embodiments, the blue laser includes a laser output module and a circuit adjusting assembly for implementing high frequency modulation, the circuit adjusting assembly including:
the filtering energy storage circuit module is externally connected with a direct current power supply;
the central control circuit module is electrically connected with the filtering energy storage circuit module;
a power adjustment setting circuit module controlled by the central control circuit module to set an adjusted target power;
and the main power conversion circuit module is supplied with electric energy by the filtering energy storage circuit module, and the power regulation setting circuit module provides converted target power so as to regulate the output power of the laser output module.
Further, in a preferred solution of some embodiments, the welding system based on blue laser further includes a collimating and focusing device, and the blue laser beam emitted from the blue laser is adjusted by the collimating and focusing device and then enters the target metal film.
Compared with the prior art, the welding method and the welding system based on the blue laser provided by the embodiment of the invention have the following main beneficial effects:
according to the welding method based on the blue laser, the patterned target metal film is designed in advance, the target metal film is arranged above two metal pieces to be welded so that a vertical gap is formed between the patterned target metal film and the two metal pieces, the modulated blue laser beam emitted by the blue laser is independently aligned to the target hollow pattern and the welding line, the corresponding metal is directly melted into molten drops by heating the target hollow pattern, when the molten drops are sequentially dripped to the welding line and filled in the welding line, the welding of the two metal pieces to be welded can be rapidly realized, and the two metal pieces to be welded do not need to be heated in the whole process. Obviously, the welding system for implementing the welding method has a simple and reliable structure, the welding method is simple and reliable, and the application range is wide, so that the welding method is not limited to the traditional tin soldering process; more importantly, the welding method does not need to heat the welding base material, so that the welding base material is not damaged, high-reliability welding with high current, high temperature resistance and high integration degree is favorably realized, and the popularization and the application of high-power devices are further favorably promoted.
Drawings
In order to illustrate the solution of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are some embodiments of the invention, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort. Wherein:
FIG. 1 is a general flow diagram of a blue laser based welding method in one embodiment of the present invention;
FIG. 2 is a more detailed flow chart of the blue laser based welding method of FIG. 1, wherein the flow chart is further detailed mainly for the case of at least two target hollow patterns;
FIG. 3 is a simplified schematic structural diagram of a blue laser based welding system in accordance with one embodiment of the present invention;
FIG. 4 is a schematic illustration of a first step in the welding process of the blue laser-based welding system of FIG. 3, wherein the blue laser beam heats the target metal film;
FIG. 5 is a schematic diagram of a second step of the welding process of the blue laser-based welding system of FIG. 3, wherein the molten droplets formed by melting the target hollow pattern have detached from the target metal film and are continuously heated by the blue laser beam during the process of dropping onto the weld;
FIG. 6 is a schematic illustration of a third step in the welding process of the blue laser-based welding system of FIG. 3, wherein the droplet reaches the weld, is rapidly available to fill the weld, and is rapidly cooled;
FIG. 7 is a schematic plan view of a target metal film according to an embodiment of the present invention, wherein the structure is mainly suitable for a blue laser beam with a circular spot;
FIG. 8 is a schematic diagram of another planar structure of a target metal film in an embodiment of the present invention, wherein the structure is mainly suitable for a square spot blue laser beam;
fig. 9 is a block diagram of the structure of the blue laser for adjusting the relationship between the main components of the output energy according to an embodiment of the present invention.
The reference numbers in the drawings are as follows:
100. a metal part to be welded; 110. welding; 200. a target metal film; 210. hollowing out the pattern; 220. carrying out molten dripping;
1. a blue laser; 11. a blue laser beam; 12. a laser output module; 13. a circuit conditioning component; 131. a filtering energy storage circuit module; 132. a central control circuit module; 133. a power regulation setting circuit module; 134. a main power conversion circuit module;
2. welding a platform; 3. a mounting frame; 4. a collimating focusing device; 5. a main body; 6. an optical fiber.
Detailed Description
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 invention belongs; the terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, e.g., the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., refer to an orientation or position based on that shown in the drawings, are for convenience of description only and are not to be construed as limiting of the present disclosure.
The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
Furthermore, 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 invention. 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.
The embodiment of the invention provides a welding method based on blue laser, which comprises the following steps of:
s100: a target metal film 200 having N hollow patterns 210 is prepared, where N is a positive integer greater than or equal to 1.
It should be noted that, in the present embodiment, the material of the target metal film 200 is usually a metal material with good heat dissipation performance, such as copper, gold, etc., so that the molten pool formed by each droplet 220 in the weld joint 110 can be rapidly cooled, thereby ensuring a high quality weld joint 110, and further ensuring realization of high-current and high-temperature resistant welding. In addition, in the present embodiment, the thickness of the target metal film 200 may reach the micrometer level. In actual use, the material, thickness, etc. of the target metal film 200 may be determined according to actual welding requirements, and are not illustrated herein.
In step S100, before welding, the hollow pattern 210 may be designed in the metal film in advance according to the expected spot shape and the size of the weld 110, etc. of the blue laser beam 11, so as to pattern the metal film, so that the metal film is patterned to facilitate presetting of the spot shape and size of the blue laser beam 11, and the hollow pattern is adopted to facilitate the blue laser beam 11 to more rapidly melt the metal corresponding to the hollow pattern 210.
In step S100, N hollow patterns 210 are usually provided to fill the welding seams 110 and ensure the stability of the welding connection. In order to ensure that the blue laser beam 11 heats one of the hollow patterns 210, the influence on other surrounding hollow patterns 210 is reduced, and the hollow patterns 210 are arranged at intervals. And for improving welding efficiency, the hollow patterns 210 are arranged in an array, so that the blue laser beam 11 can be conveniently and quickly aligned to the corresponding hollow patterns 210.
Preferably, in order to facilitate the blue laser beam 11 to rapidly melt the metal corresponding to the hollow pattern 210 to form the molten drop 220 when heating the hollow pattern 210, and to separate the molten drop from the target metal film 200, the hollow pattern 210 has a structure with a solid pattern in the center and a hollow in the periphery of the center. It can be understood that the molten drop 220 formed by heating each hollow pattern 210 by the blue laser beam 11 is mainly formed by melting metal corresponding to the solid pattern at the center of each hollow pattern 210.
More preferably, in one embodiment, as shown in fig. 7, the hollow pattern 210 of the target metal film 200 has a circular solid pattern shape at the center and a cross-shaped hollow structure at the periphery of the center. Here, in this embodiment, the spot shape of the blue laser beam 11 passing through the target metal film 200 may be defined as a circle.
Alternatively, in another embodiment, as shown in fig. 8, the hollow pattern 210 of the target metal film 200 has a square shape in the center and a cross-shaped hollow structure in the periphery of the center. Likewise, in this embodiment, the spot shape of the blue laser beam 11 passing through the target metal film 200 may be defined as a square.
Of course, in practice, the solid pattern adopted in the center of the hollow pattern 210 may also be a structure with other shapes, and is not limited thereto. It should be noted that the shape and size of each hollow pattern 210 are consistent, so that the metal content of each molten drop 220 can be ensured to be consistent, and the quality and the aesthetic property of the welding seam 110 can be ensured.
S200: two metal members to be welded 100 with a weld 110 formed therebetween are mounted on the welding table 2, and a target metal film 200 is provided so that the target metal film 200 is positioned above the metal members to be welded 100.
It should be noted that, in the present embodiment, the two metal pieces to be welded 100 are generally made of a highly reflective metal material. For example, the material of the two metal pieces to be welded may be copper, a copper alloy, gold, or the like. In addition, the two metal pieces 100 to be welded may be made of the same material or different materials.
It is understood that in this step S200, the mounting order of the target metal film 200 and the two metal parts to be welded 100 may be determined according to actual conditions, and it is mainly sufficient to ensure that the target metal film 200 is finally positioned above the metal parts to be welded 100, and it is not required that the target metal film 200 is positioned directly above the metal parts to be welded 100.
In some embodiments, if the metal part 100 to be welded is mounted first, the step S200 may specifically include the following steps:
s210: two metal pieces 100 to be welded are mounted on a welding platform 2 that is horizontally movable.
It is understood that in this step S210, the two metal parts 100 to be welded can move along with the welding platform 2 in the horizontal plane along the X-axis direction and/or the Y-axis direction, so that the weld joint 110 can be aligned with the blue laser beam 11 at a proper time, which is beneficial to ensure the welding quality. It should be noted that, usually, two metal parts 100 to be welded move synchronously, but in practical applications, if the weld 110 formed between the two metal parts deviates from the target weld 110, one of the metal parts 100 to be welded may also be adjusted as required, but in this case, the structure of the adopted welding platform 2 is slightly complicated.
It should be noted that, in the present embodiment, two metal pieces 100 to be welded are usually arranged side by side in a gap, that is, the gap between the two is the weld 110.
S220: above the metal member 100 to be welded, the target metal film 200 is set on the mount 3 capable of moving horizontally and/or up and down.
In this step S220, it is understood that the mounting frame 3 is installed above the welding platform 2, so that the target metal film 200 is directly installed on the mounting frame 3 after the two metal pieces to be welded 100 are installed. In a similar way, the target metal film 200 can move along the X-axis direction and/or the Y-axis direction on the horizontal plane along with the mounting frame 3, so that the blue light laser beam 11 can be adjusted to be specifically aligned to which hollow pattern 210 by directly moving the mounting frame 3, and welding suitable for different welding positions can be ensured by matching with the welding platform 2, and the welding efficiency can be improved.
In addition, the target metal film 200 can vertically move up and down along the Z-axis direction along with the mounting frame 3, so that the energy of the blue laser beam 11 emitted into the target metal film 200 and the energy of the blue laser beam 11 continuously heating the molten drop 220 after the molten drop 220 is formed are favorably adjusted; and secondly, adjusting corresponding parameters according to different thicknesses of the target metal film 200.
Or, in other embodiments, if the target metal film 200 is installed first, the step S200 in this embodiment is mainly different from the embodiment of installing the metal member to be welded 100 first, and the step S200 in this embodiment may specifically include the following steps:
s210: the target metal film 200 is disposed on the mount 3 capable of moving horizontally and/or up and down.
S220: below the target metal film 200, two metal members 100 to be welded are mounted on a horizontally movable welding stage 2.
S300: the blue laser 1 is started, the output energy of the blue laser 1 is adjusted according to the target requirement, and the blue laser beam 11 emitted by the blue laser 1 is directed at one of the hollow patterns 210 to serve as the target hollow pattern 210.
It should be noted that in the step S300, the output energy of the blue laser beam 11 in the blue laser 1 is usually adjusted before or after the first hollow pattern 210 is aligned, or in the process of aligning the first hollow pattern 210, and when adjusting other hollow patterns 210, the output energy of the blue laser beam 11 does not need to be adjusted, in short, the blue laser beam 11 usually only performs one output energy adjustment in the whole welding process.
It should be noted that the specific output energy of the blue laser 1 is mainly realized by high-frequency modulation current according to the welding requirement, different target metal film 200 materials and thicknesses, and the like, and in this embodiment, the output power of the blue laser 1 may reach 100W.
It can be understood that, a total pre-design of N hollow patterns 210 in the target metal film 200, so, N hollow patterns 210 can theoretically all be used as target hollow patterns, when it is necessary to use a remaining hollow pattern 210 in the target metal film 200 as a target hollow pattern, the position of the mounting frame 3 can be directly moved to synchronously move the position of the target metal film 200, so that the hollow pattern 210 can be aligned with the blue laser beam 11, and the hollow pattern 210 should be aligned with the welding seam 110.
It is also understood that, as shown in fig. 4, when the target hollow pattern is locked, the blue laser beam 11 should be generally aligned with the welding seam 110, so as to ensure that the molten droplet 220 melted by the blue laser beam 11 is accurately dropped into the welding seam 110, thereby ensuring the welding quality; and secondly, the blue laser beam 11 is ensured not to irradiate the metal part 100 to be welded, so that the welding base material is not damaged in the welding process, the welding of high-current high-temperature-resistant application occasions is further ensured, a high-reliability welding method is provided for the welding of high-power electronic devices such as automobile electronics, 5G communication base stations and power electronic equipment, and the popularization and application of the high-power devices are facilitated.
S400: the target hollow pattern 210 is heated by the blue laser beam 11, so that the metal corresponding to the target hollow pattern 210 is melted into a molten drop 220, until the molten drop 220 is separated from the target metal film 200 and drops to the weld 110, so as to finally weld and connect the two metal parts 100 to be welded together.
In other words, in the step S400, as shown in fig. 5 and fig. 6, once the blue laser beam 11 is aligned with the target hollow pattern 210, the blue laser beam 11 can continuously heat the target hollow pattern, and the metal corresponding to the target hollow pattern 210 is melted into the molten droplet 220 by the heating of the blue laser beam 11 until the molten droplet 220 is separated from the target metal film 200; furthermore, during the dropping of the droplet 220, the blue laser beam 11 continues to heat the droplet 220 until it is dropped to the weld 110.
It should be noted that the "target hollow pattern" in step S400 does not specifically refer to which hollow pattern 210 is, but is mainly selected as the target hollow pattern, and the step is performed. In actual operation, each target hollow pattern is selected sequentially, that is, the current target hollow pattern 210 is selected only after the last target hollow pattern 210 is selected to be fused into the molten droplet 220 and dropped onto the welding seam 110. After a number of droplets 220 have dropped onto the weld joint 110 and filled the weld joint 110, the welding of the two metal parts 100 to be welded is completed.
Specifically, if there are M target hollow patterns, where M is a positive integer greater than or equal to 1, and M is less than or equal to N.
When M is greater than 1, that is, when there are at least two target hollow patterns 210 in total, the heating action of the blue laser beam 11 on the mth target hollow pattern 210 is performed after the molten droplet 220 formed by the mth-1 target hollow pattern 210 is dropped to the welding line 110.
That is, as shown in fig. 2, taking the case that M is greater than 1 as an example, the welding method based on the blue laser specifically includes the following steps:
s100: a target metal film 200 having N hollow patterns 210 is prepared, where N is a positive integer greater than or equal to 1.
S200: two metal members to be welded 100 with a weld 110 formed therebetween are mounted on the welding table 2, and a target metal film 200 is provided so that the target metal film 200 is positioned above the metal members to be welded 100.
S300: the method comprises the steps of starting the blue laser 1, adjusting the output energy of the blue laser 1 according to target requirements, and aligning a blue laser beam 11 emitted by the blue laser 1 to one of the hollow patterns 210 to serve as a 1 st target hollow pattern 210.
S400: the 1 st target hollow pattern 210 is heated by the blue laser beam 11, so that the metal corresponding to the 1 st target hollow pattern 210 is melted into a first molten drop 220, and the first molten drop 220 is separated from the target metal film 200 and drops to the welding seam 110.
S500: after the M-1 th molten drop 220 formed by the M-1 th target hollow pattern 210 drops to the welding seam 110, aligning the blue laser beam 11 emitted by the blue laser 1 with the remaining one of the hollow patterns 210 to serve as the M-1 th target hollow pattern 210; heating the Mth target hollow pattern 210 through a blue laser beam 11, so that the metal corresponding to the Mth target hollow pattern 210 is melted into an Mth molten drop 220, until the Mth molten drop 220 is separated from the target metal film 200 and drops to the welding line 110; wherein M is a positive integer greater than 1 and M is less than or equal to N.
S600: step S500 is repeatedly performed until the filling of the weld 110 is completed to achieve the welded connection of the two metal pieces 100 to be welded.
That is, after the 1 st target hollow pattern 210 is melted into a molten droplet 220 and dropped to the welding seam 110, the 2 nd target hollow pattern 210 is aligned and selected in the target metal film 200 by the blue laser beam 11, after the 2 nd target hollow pattern 210 is melted into a molten droplet 220 and dropped to the welding seam 110, the 3 rd target hollow pattern 210 is aligned and selected in the target metal film 200 by the blue laser beam 11, and so on, after the M-1 th target hollow pattern 210 is melted into a molten droplet 220 and dropped to the welding seam 110, the M th target hollow pattern 210 is aligned and selected in the target metal film 200 by the blue laser beam 11, melted into a molten droplet 220 and dropped to the welding seam 110 until the filling of the welding seam 110 is completed.
Compared with the prior art, the welding method based on the blue laser has the following beneficial effects: according to the welding method based on the blue laser, the patterned target metal film 200 is designed in advance, the target metal film 200 is arranged above the two metal parts 100 to be welded, so that a vertical gap is formed between the patterned target metal film 200 and the two metal parts 100 to be welded, the modulated blue laser beam 11 emitted by the blue laser 1 is independently aligned to the target hollow pattern 210 and the welding line 110, the corresponding metal is directly melted into the molten drops 220 by heating the target hollow pattern 210, and when the molten drops 220 are sequentially dropped to the welding line 110 and are filled in the welding line 110, the welding of the two metal parts 100 to be welded can be rapidly realized, and the two metal parts 100 to be welded do not need to be heated in the whole process. Obviously, the welding method is simple and reliable, not only can be suitable for the traditional tin soldering process, but also can be suitable for other welding structures, more importantly, the welding method does not need to heat the welding base material, so that the welding base material is not damaged, high-current, high-temperature-resistant and high-integration-degree high-reliability welding is favorably realized, and the popularization and the application of high-power devices are further promoted.
The embodiment of the invention also provides a welding system based on the blue laser, wherein the welding system based on the blue laser is mainly used for implementing the welding method based on the blue laser, and of course, the welding system based on the blue laser also can have other suitable purposes. In the present embodiment, the blue laser-based welding system includes a blue laser 1, a welding stage 2, a mounting bracket 3, and a control device. In practice, the welding system may also comprise a body 5.
In this embodiment, the blue laser 1 is mainly used for emitting the blue laser beam 11, and of course, the output energy of the emitted blue laser beam 11 needs to be determined according to actual situations, that is, the blue laser 1 needs to have a function of adjusting the output energy of the blue laser beam 11.
In the present embodiment, as shown in fig. 3, the welding platform 2 and the mounting bracket 3 are both provided on the main body 5, and the mounting bracket 3 is located above the welding platform 2. The welding platform 2 is mainly used for installing two metal parts 100 to be welded and driving the metal parts 100 to be welded to move horizontally. In fact, in this embodiment, the welding platform 2 can also realize automatic loading and unloading. Correspondingly, the mounting bracket 3 is mainly used for mounting the target metal film 200 and can drive the target metal film 200 to move horizontally and/or vertically, so that different welding positions can be adapted, and the welding efficiency is improved.
It will be appreciated that the welding platform 2 and the mounting frame 3 are independently movably arranged on the body 5. In this way, through the movable cooperation of the welding platform 2 and the mounting frame 3, the alignment between the blue laser beam 11 in different welding positions, the target hollow pattern 210 in the target metal film 200 and the welding seam 110 can be rapidly completed.
It should be noted that the independent moving structure of the welding platform 2 and the mounting frame 3 may be a conventional moving connection structure, or a self-created moving connection structure, which is not the key point of the present invention, and therefore, the detailed description thereof is omitted.
In this embodiment, in order to adjust the output energy of the blue laser 1, move the welding stage 2, move the mounting block 3, and the like, the control device (not shown) is electrically connected to the blue laser 1, the welding stage 2, and the mounting block 3. Generally, for convenient operation, the control device is internally provided with upper computer software, so that the software can be directly operated to set and modulate the output power of the blue laser 1 and carry out coordinated and matched movement on the welding platform 2 and the mounting rack 3.
Compared with the prior art, the welding system based on the blue laser has the following beneficial effects: this a welding system for implementing above-mentioned welding method based on blue laser adopts blue laser 1 alone, newly sets up an installation frame 3 in the top of welding platform 2 that can the horizontal migration, can cooperate and realize foretell welding method, so, this welding system based on blue laser's structure is fairly simple, does benefit to and realizes fairly simple welding process.
Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 9, the blue laser 1 includes a laser output module 12 and a circuit adjusting component 13, where the circuit adjusting component 13 is mainly used for implementing high frequency modulation of a circuit. Specifically, in the present embodiment, the circuit adjusting assembly 13 includes a filter tank circuit module 131, a central control circuit module 132, a power adjustment setting circuit module 133, and a main power converting circuit module 134. As shown in fig. 9, the filtering energy storage circuit module 131 is usually externally connected to a dc power supply; the central control circuit module 132 is electrically connected to the filtering and energy storing circuit module 131; a power adjustment setting circuit module 133 controlled by the central control circuit module 132 to set an adjusted target power; the main power conversion circuit module 134 is supplied with electric energy by the filtering energy storage circuit module 131, and the power adjustment setting circuit module 133 provides the converted target power to adjust the output power of the laser output module 12.
It can be understood that, as shown in fig. 9 again, the output energy of the blue laser 1 is adjusted by the following principle: the control device sends an initial adjustment instruction to the central control circuit module 132, the central control circuit module 132 sends an adjustment instruction of target power to the power adjustment setting circuit module 133 after receiving the initial adjustment instruction, the main power conversion circuit module 134 adjusts the current of the circuit to a target current corresponding to the target power after receiving the target power adjustment instruction and under the cooperation of the filtering energy storage circuit module 131, and transmits the target current to the laser output module 12 of the blue laser 1, so as to adjust the output energy of the blue laser 1.
Further, as a specific implementation manner in some embodiments of the present invention, as shown in fig. 3 and 9, in order to improve the quality of the working blue laser beam 11 and further ensure the welding quality and the welding efficiency, the welding system based on the blue laser further includes a collimating and focusing device 4, and actually, the welding system further includes an optical fiber 6 (not shown in fig. 9). The blue laser beam 11 emitted from the blue laser 1 is adjusted by the collimating and focusing device 4 and then enters the target metal film 200.
It should be noted that, as shown in fig. 3 and fig. 9 in particular, the collimating and focusing device 4 is disposed on the main body 5 and located above the mounting frame 3, and the laser output module 12 of the blue laser 1 is connected to the collimating and focusing device 4 through the optical fiber 6.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A welding method based on blue laser is characterized by comprising the following steps:
preparing a target metal film with N hollow patterns, wherein N is a positive integer greater than or equal to 1;
installing two metal pieces to be welded, between which a welding line is formed, on a welding platform, arranging the target metal film, and enabling the target metal film to be positioned above the metal pieces to be welded;
starting a blue laser, adjusting the output energy of the blue laser according to target requirements, and aligning a blue laser beam emitted by the blue laser to one of the hollow patterns to serve as a target hollow pattern;
and heating the target hollow pattern through a blue laser beam, so that the metal at the corresponding position of the target hollow pattern is molten into a molten drop until the molten drop is separated from the target metal film and drops to the welding line, and finally, welding and connecting the two metal parts to be welded together.
2. The welding method based on the blue laser as claimed in claim 1, wherein the number of the target hollow patterns is M, M is a positive integer greater than or equal to 1, and M is less than or equal to N;
and when M is larger than 1, the heating action of the blue laser beam on the Mth target hollow pattern is executed after the molten drops formed by the Mth-1 target hollow pattern drop to the welding line.
3. The welding method based on the blue laser as claimed in claim 1, wherein the hollow patterns are arranged in a gap and array.
4. The welding method based on the blue laser as claimed in claim 3, wherein the hollowed-out pattern is a structure with a solid center and a hollowed-out center periphery.
5. The welding method based on the blue laser as claimed in claim 4, wherein the solid pattern in the center of the hollow pattern is circular or square, and the periphery of the center is a crisscross hollow structure.
6. The welding method based on the blue laser according to claim 1, wherein the step of mounting two metal members to be welded, between which a weld is formed, on a welding platform, and disposing the target metal film above the metal members to be welded specifically comprises the steps of:
mounting two metal pieces to be welded on a welding platform capable of moving horizontally;
arranging the target metal film on a mounting rack capable of moving horizontally and/or up and down above the metal piece to be welded;
or specifically comprises the following steps:
disposing the target metal film on a mount that can be moved horizontally and/or up and down;
and mounting the two metal pieces to be welded on a welding platform which can move horizontally below the target metal film.
7. Welding method based on blue laser according to claim 1, characterized in that the two metal pieces to be welded are made of highly reflective metal material.
8. A blue laser based welding system for implementing the blue laser based welding method of any one of claims 1 to 7, the blue laser based welding system comprising:
a blue laser for emitting a blue laser beam;
the welding platform is used for installing two metal pieces to be welded and driving the metal pieces to be welded to move horizontally;
the mounting rack is positioned above the welding platform and used for mounting a target metal film and driving the target metal film to horizontally and/or vertically move;
and the control device is electrically connected with the blue laser, the welding platform and the mounting rack.
9. The blue laser-based welding system of claim 8, wherein the blue laser comprises a laser output module and a circuit conditioning assembly for implementing high frequency modulation, the circuit conditioning assembly comprising:
the filtering energy storage circuit module is externally connected with a direct current power supply;
the central control circuit module is electrically connected with the filtering energy storage circuit module;
a power adjustment setting circuit module controlled by the central control circuit module to set an adjusted target power;
and the main power conversion circuit module is supplied with electric energy by the filtering energy storage circuit module, and the power regulation setting circuit module provides converted target power so as to regulate the output power of the laser output module.
10. The blue laser based welding system according to claim 8, further comprising a collimating and focusing device, wherein the blue laser beam emitted from the blue laser is adjusted by the collimating and focusing device and then enters the target metal film.
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