A low-spatter laser welding method suitable for X-Pin motor stator pins

Abstract

The present invention discloses a low-spatter laser welding method suitable for X-Pin motor stator pins, relating to the field of laser processing applications. The method comprises: configuring a pin clamping fixture, and using the pin clamping fixture to clamp and overlap the pins of the permanent magnet motor stator; utilizing a pre-configured composite laser welding lens, and laser welding the pins of the permanent magnet motor stator based on the laser welding position, laser welding path, and anti-reverse mechanism; and utilizing a laser beam spot control mechanism to expand the laser welding molten pool range and reduce the laser welding energy density. The present invention utilizes the uniform spot of a semiconductor blue laser and the high blue light absorption rate of copper, which varies little with temperature. By using a blue light spot instead of an infrared ring spot, the method achieves extremely low spatter in X-Pin motor copper welding, lowers the cost of use, and is more conducive to mass production.

Description

Technical Field

[0001] The present invention relates to the field of laser processing applications, and in particular to a low-spatter laser welding method suitable for X-Pin motor stator pins. Background Art

[0002] In the past two years, the new energy vehicle industry has experienced explosive growth, leading to fierce market competition. To expand market share, major automakers have been meticulously focusing on cost control, performance optimization, and other aspects, striving to enhance the overall competitiveness of their products. Permanent magnet motors, as the core power components of new energy vehicles, boast energy conversion efficiencies as high as 96%-97%, far exceeding those of internal combustion engines. Their performance is a key factor influencing electric vehicle performance.

[0003] The stator coil winding is the core component of a permanent magnet motor. The motor generates a rotating magnetic field through three-phase windings, which interacts with the magnetic field of the permanent magnets on the rotor to drive the motor. Permanent magnet motors are categorized by stator coil winding type, including I-Pin, U-Pin, X-Pin, and W-Pin. I-Pin is the oldest and most mature technology; U-Pin is less developed; and X-Pin, as a newly proposed solution, is still in the exploratory stage.

[0004] The X-Pin winding is mainly optimized at the welding end, eliminating the straight line section at the end and connecting it in a cross X shape, further improving the filling rate and compactness of the winding. With lower copper loss and higher slot fill rate, it is expected to become the king of flat wire motors. X-Pin motor stator welding is a key step in the process, and its key process parameters are high penetration, fast welding and low spatter. The current mainstream annular infrared light welding can meet the process requirements of ≥1.8mm penetration, and the welding efficiency can be controlled within 0.3s, but the process requirements of extremely low spatter or even no spatter have not been solved. The annular infrared light source does have less continuous spatter than a single infrared beam when welding highly reflective materials, but the absorption rate of copper to infrared lasers determines the inevitability of spatter. At room temperature, the absorption rate of copper to infrared lasers is only about 3%-5%; when the temperature gradually rises to 1250K-1350K, the absorption rate of copper to infrared lasers suddenly jumps to about 15%. Figure 1 shown.

[0005] The sudden change in the infrared light absorption rate causes the heat accumulation rate in the liquid copper molten pool to soar several times instantly under the same laser power density. At this time, the liquid copper absorbs a sharp increase in heat, causing the script temperature to rise sharply. The sudden temperature rise causes the absorption rate to further increase, which makes the temperature rise more intense. The thermal conductivity characteristics of copper cannot balance the huge temperature difference. The laser heating position even reaches a level close to the boiling point of liquid copper, causing severe disturbances in the molten pool. Ultimately, the continuous heat input causes the copper molten pool to fluctuate violently, causing boiling and explosion inside the molten pool, resulting in spatter defects. These spatters will not only burn the paint, but also adhere to the silicon steel sheet of the stator, causing local micro-short circuits. Welding spatter is a major technical shortcoming that currently restricts the development of X-Pin technology. The suppression of spatter is the key to improving the yield. Spatter causes defects such as Figure 2 shown.

[0006] The current mainstream annular infrared light source is the integration of Gaussian beam and annular beam. Gaussian beam ensures sufficient melting depth through high energy density; annular beam is obtained through beam shaping, and relatively uniform regional heating of copper is achieved through dispersed annular light spots. The annular beam design expands the molten pool width, to a certain extent reduces the molten pool boiling caused by the drastic change in the absorption rate of high-temperature copper, and reduces the risk of spatter. However, this solution cannot solve the problem of sudden changes in the absorption rate of high-temperature copper. The molten pool boiling can only be reduced, and the spatter problem cannot be fundamentally solved. Annular infrared light source such as Figure 3 shown.

[0007] Currently, no effective solutions have been proposed for the problems in related technologies. Summary of the Invention

[0008] In response to the problems in the related art, the present invention proposes a low-spatter laser welding method suitable for X-Pin motor stator pins to overcome the above-mentioned technical problems existing in the existing related art.

[0009] To this end, the specific technical solutions adopted in the present invention are as follows:

[0010] A low-spatter laser welding method for X-Pin motor stator pins, the method comprising:

[0011] S1. Configure a pin clamping tool, and use the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator;

[0012] S2. Using a pre-configured composite laser welding lens, and based on the laser welding position, laser welding path, and anti-reverse mechanism, laser welding the pins of the permanent magnet motor stator;

[0013] S3. Utilize the laser beam spot control mechanism to expand the molten pool range of laser welding and reduce the laser welding energy density.

[0014] Furthermore, configuring a pin clamping tool, and using the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator includes:

[0015] Setting a first tooling plate and a second tooling plate of a pin clamping tooling, and aligning the pins of the permanent magnet motor stator with the holes in the first tooling plate and the second tooling plate;

[0016] The starting tool is used to overlap the inner and outer ring pins of the permanent magnet motor stator facing each other.

[0017] Furthermore, in order to be able to composite red and blue light sources, the pre-configured composite laser welding lens includes a shell, a high-absorption rate beam guiding component is provided in the middle of the shell, an auxiliary beam guiding component is provided on one side of the shell, and an imaging component is provided on the other side of the shell; a protective lens is provided at the bottom of the shell, a composite light outlet is provided at the bottom end of the protective lens, and a coaxial blowing interface is provided on one side of the protective lens.

[0018] Furthermore, in order to transmit the highly absorptive blue light and reflect the auxiliary red light, the high absorptive beam guiding assembly includes a high absorptive beam channel arranged in the middle of the shell, a first collimating entrance is provided at one end of the high absorptive beam channel, and a first lens and a second lens are sequentially provided in the middle of the high absorptive beam channel, and the first lens and the second lens are used to reflect and transmit the light beam.

[0019] Furthermore, in order to provide an auxiliary red light beam, the auxiliary beam guiding assembly includes an auxiliary beam channel arranged on one side of the shell, a third lens is arranged at the corner of the auxiliary beam channel, a second collimation entrance is arranged at one end of the auxiliary beam channel, the other end of the auxiliary beam channel extends to the first lens, and a swing motor is arranged on one side of the third lens.

[0020] Furthermore, in order to complete the imaging work of welding, the imaging component includes a camera optical path arranged on the other side of the shell, a fourth lens is arranged at the corner of the camera optical path, a camera and an imaging lens are arranged in sequence at one end of the camera optical path, and the other end of the camera optical path extends to the second lens.

[0021] Furthermore, laser welding positions include:

[0022] The laser welding position is determined based on the principle of ensuring that the weld has effective penetration and uniform heat-affected zone.

[0023] Furthermore, the laser welding path includes:

[0024] Covering the pins of the permanent magnet motor stator with a high absorption rate beam; setting the swing path and swing radius of the auxiliary beam according to the pin size of the permanent magnet motor stator;

[0025] When the pins of the permanent magnet motor stator are heated separately, the path of the auxiliary light beam covers the pins of the permanent magnet motor stator;

[0026] When heating is applied to the parallel-connected pins of a permanent magnet motor stator, the path of the auxiliary light beam crosses the parallel-connected pins.

[0027] Furthermore, the anti-countermeasures include:

[0028] The pre-configured composite laser welding lens has a preset range of tilt angles relative to the vertical plane.

[0029] Furthermore, the laser beam spot control mechanism includes:

[0030] Increase the laser beam spot size by setting the defocus amount.

[0031] The beneficial effects of the present invention are:

[0032] (1) The present invention utilizes the uniform spot of a semiconductor blue laser and the high blue light absorption rate of copper, which has a small change in absorption rate with temperature. By using a blue light spot instead of an infrared annular spot, the present invention achieves extremely low spatter in X-Pin motor copper welding. It can achieve the process standards of X-Pin stator weld penetration ≥ 2mm, welding heat-affected zone ≤ 5mm, and extremely low welding spatter. In addition, the present invention has a lower cost of use and is more conducive to mass production.

[0033] (2) Compared with infrared ring beam, blue light beam has the following advantages:

[0034] Copper absorbs up to 65% of blue light, 13 times its infrared absorption rate. Theoretically, 1 / 13 of the energy of blue light can achieve the same heating effect as infrared light, significantly improving energy efficiency. Similar results can be achieved with lower power, significantly reducing equipment and energy costs. Copper's absorption rate for blue light varies minimally at different temperatures, eliminating the sudden change in absorption near the melting point of high-temperature copper and virtually eliminating the boiling point phenomenon. Currently, the spot size of blue semiconductor lasers is flat-top, requiring no processing and no beam shaping. This makes implementation simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is the temperature curve of copper's absorption rate of infrared laser;

[0037] Figure 2 This is a bad schematic diagram caused by welding spatter;

[0038] Figure 3 This is the principle diagram of the annular infrared beam;

[0039] Figure 4 This is the principle diagram of the red and blue composite beam;

[0040] Figure 5 This is a diagram of the bending method of the X-Pin motor tooling;

[0041] Figure 6 This is a diagram of the X-Pin winding pin fitting method;

[0042] Figure 7 1 is a schematic structural diagram of a pre-configured composite laser welding lens in a low-spatter laser welding method for an X-Pin motor stator pin according to an embodiment of the present invention;

[0043] Figure 8 1 is a schematic diagram of the internal structure of a pre-configured composite laser welding lens in a low-spatter laser welding method for an X-Pin motor stator pin according to an embodiment of the present invention;

[0044] Figure 9 It is a schematic diagram of the red and blue composite welding process;

[0045] Figure 10 This is a schematic diagram of the red and blue composite laser processing path;

[0046] Figure 11 It is a schematic diagram of the laser anti-reverse tilt angle;

[0047] Figure 12 This is a comparison chart of temperature rise curves of blue light and infrared light;

[0048] Figure 13 The present invention is a flowchart of a low-spatter laser welding method for X-Pin motor stator pins according to an embodiment of the present invention.

[0049] In the picture:

[0050] 1. Shell; 2. High-absorption rate beam guiding assembly; 201. High-absorption rate beam channel; 202. First collimation entrance; 203. First lens; 204. Second lens; 3. Auxiliary beam guiding assembly; 301. Auxiliary beam channel; 302. Third lens; 303. Second collimation entrance; 304. Swing motor; 4. Imaging assembly; 401. Camera optical path; 402. Fourth lens; 403. Camera; 404. Imaging lens; 5. Protective lens; 6. Composite light outlet; 7. Coaxial air blowing interface. DETAILED DESCRIPTION

[0051] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0052] According to an embodiment of the present invention, a low-spatter laser welding method for X-Pin motor stator pins is provided. Specifically, this method relates to X-Pin welding in permanent magnet motors. A red-blue composite light source (beam) replaces the currently mainstream infrared ring light source (beam) for flat wire motor pin welding.

[0053] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 13 As shown, a low-spatter laser welding method for an X-Pin motor stator pin according to an embodiment of the present invention includes:

[0054] S1. Configure a pin clamping tool, and use the pin clamping tool to clamp and connect the pins (pin feet) of the permanent magnet motor (X-Pin motor) stator.

[0055] S2. Using a pre-configured composite laser welding lens, and based on the laser welding position, laser welding path, and anti-reverse mechanism, laser welding is performed on the pins of the permanent magnet motor stator.

[0056] S3. Utilize the laser beam spot control mechanism to expand the molten pool range of laser welding and reduce the laser welding energy density.

[0057] In one embodiment, configuring a pin clamping tool and using the pin clamping tool to clamp and overlap pins of a permanent magnet motor stator includes:

[0058] A first tooling plate and a second tooling plate of a pin clamping tooling are provided, and the pins of the permanent magnet motor stator are aligned with the holes in the first tooling plate and the second tooling plate.

[0059] The starting tool is used to overlap the inner and outer ring pins of the permanent magnet motor stator facing each other.

[0060] like Figure 7-Figure 8As shown, in one embodiment, the pre-configured composite laser welding lens includes a shell 1, a high-absorption rate beam guiding component 2 is provided in the middle of the shell 1, an auxiliary beam guiding component 3 is provided on one side of the shell 1, and an imaging component 4 is provided on the other side of the shell 1; a protective lens 5 is provided at the bottom of the shell 1, a composite light outlet 6 is provided at the bottom end of the protective lens 5, and a coaxial blowing interface 7 is provided on one side of the protective lens 5, so that a red and blue light source can be composited.

[0061] In one embodiment, the high-absorption rate beam guiding assembly 2 includes a high-absorption rate beam channel 201 arranged in the middle of the shell 1, a first collimating entrance 202 is provided at one end of the high-absorption rate beam channel 201, and a first lens 203 and a second lens 204 are sequentially provided in the middle of the high-absorption rate beam channel 201, and the first lens 203 and the second lens 204 are used to reflect and transmit the light beam, so that it can transmit high-absorption rate blue light and reflect auxiliary red light.

[0062] In one embodiment, the auxiliary beam guiding assembly 3 includes an auxiliary beam channel 301 disposed on one side of the housing 1. A third lens 302 is disposed at a corner of the auxiliary beam channel 301. A second collimating entrance 303 is disposed at one end of the auxiliary beam channel 301. The other end of the auxiliary beam channel 301 extends to the first lens 203. A swing motor 304 is disposed on one side of the third lens 302 to provide an auxiliary red light beam. The swing motor 304 is used to control the auxiliary beam, so that the auxiliary beam, i.e., infrared light, moves rapidly along a specified path while the lens remains stationary.

[0063] In one embodiment, the imaging assembly 4 includes a camera optical path 401 arranged on the other side of the shell 1, a fourth lens 402 is arranged at the corner of the camera optical path 401, a camera 403 and an imaging lens 404 are arranged in sequence at one end of the camera optical path 401, and the other end of the camera optical path 401 extends to the second lens 204, thereby completing the imaging work of welding.

[0064] In one embodiment, the laser welding locations include:

[0065] The laser welding position is determined based on the principle of ensuring that the weld has effective penetration and uniform heat-affected zone.

[0066] In one embodiment, the laser welding path includes:

[0067] A high absorption rate beam is used to cover the pins of the permanent magnet motor stator; and a swing path and a swing radius of the auxiliary beam are set according to the pin size of the permanent magnet motor stator.

[0068] When the pins of the permanent magnet motor stator are heated individually, the path of the auxiliary light beam covers the pins of the permanent magnet motor stator.

[0069] When heating is applied to the parallel-connected pins of a permanent magnet motor stator, the path of the auxiliary light beam crosses the parallel-connected pins.

[0070] In one embodiment, the anti-counterfeiting mechanism includes:

[0071] The pre-configured composite laser welding lens has a preset range of tilt angles relative to the vertical plane.

[0072] In one embodiment, utilizing a laser beam spot control mechanism includes:

[0073] Increase the laser beam spot size by setting the defocus amount.

[0074] In order to facilitate understanding of the above technical solutions of the present invention, the working principle of the present invention in actual process is described in detail below.

[0075] The present invention uses a red and blue composite beam to integrate the infrared Gaussian beam and the blue flat-top beam, and uses the blue flat-top beam to replace the infrared ring beam to achieve the welding of the pin pins. Figure 4 shown.

[0076] The specific implementation of the present invention is as follows:

[0077] 1) According to the number of solder points on different X-Pin stators, a fixture is designed so that each pin can be clamped independently and tightly. The fixture is divided into upper and lower plates. During the installation process, the pins on the X-Pin stator are matched one by one with the holes on the fixture, and then tightly inserted into the holes on the fixture. After insertion, start the fixture, rotate the upper plate to the left, and the lower plate to the right, so that the two copper wires are bent in one direction, such as Figure 5 shown.

[0078] 2) The outer ring of the X-Pin winding is bent to the left, and the inner ring of the winding is bent to the right. The inner and outer bending parts are spliced ​​toward each other, and finally the pins are overlapped. Figure 6 shown.

[0079] 3) The laser welding equipment uses single-mode infrared laser and semiconductor blue laser as light sources; the welding lens uses a red and blue composite welding lens.

[0080] The red and blue composite welding lens is the core component of this proposal, which consists of optical fiber alignment interface, blue light alignment interface, CCD camera, protective lens, imaging lens and other components. Figure 7-Figure 8 shown.

[0081] The red-blue composite lens transmits both infrared and blue light, enabling coaxial emission of the infrared and blue beams. The welding lens's light outlet not only needs to output the red-blue composite light but also provide coaxial airflow for nitrogen shielding during welding. The infrared beam of the red-blue composite light can be oscillated within a small range using a small motor; the blue beam only needs to be wrapped around the beam, eliminating the need for oscillation.

[0082] At the same time, the equipment needs to be equipped with a chiller to cool core components such as infrared lasers, blue lasers, and red-blue composite welding heads to ensure the stability of core components.

[0083] 4) During the welding process, the composite lens provides coaxial air blowing to prevent metal oxidation during welding. The welding position is at the center of the two pins to ensure that the weld has a large penetration depth and a uniform heat-affected zone. In addition, the blue light covers the infrared light and does not swing. The infrared laser sets a reasonable swing path and swing radius according to the size of the X-Pin copper wire, which can effectively increase the effective penetration depth and coverage area of ​​the weld. The welding process is as follows Figure 9 shown.

[0084] 5) The laser's oscillation path and radius are related to the pin structure. X-Pin motor pins are made of two bare copper pillars, approximately 5mm long, with the remainder covered in paint. The soldering process must be completed within 0.2 seconds, otherwise the copper pillars will transfer heat to the paint, potentially burning it.

[0085] During red-blue hybrid laser welding, the blue light partially covers the entire pin, eliminating the need for path planning. The infrared laser welding path is divided into two parts: one for heating each pin separately, and the other for achieving parallel connection between the two pins.

[0086] The first step quickly heats both pins to near their melting point. This requires as even heating as possible, scanning every part of the pin as possible. The processing speed of the infrared laser's first step depends on the blue light power and the size of the pin. Larger pins require more energy and take longer to heat. Higher blue light power handles more of the heating task, shortening the infrared processing time. If the blue light is powerful enough to heat the pins to near their melting point within 0.1 seconds, the first step can be omitted. Experimental results show that when the blue light power exceeds 700W, this separate infrared laser processing can be eliminated.

[0087] The second part melts the two pins into one. The path planning determines the shape and melting depth after melting. The processing path of the second part needs to span the two pins. It can be a circular path or an elliptical path. The radius of the path determines the width of the melting, and the processing time determines the size of the melting depth. The overall laser processing path, such as Figure 10 shown.

[0088] 6) The welding process needs to consider the anti-reverse mechanism, such as Figure 11 The welding head cannot be completely perpendicular to the vertical plane and must maintain a certain tilt angle. The tilt angle of the welding head should be ≥2° to prevent excessive infrared light reflection from the copper and damage to optical components. In addition, the tilt angle should be ≤10° to avoid paint burn-off caused by uneven heat-affected zones.

[0089] 7) The high absorption rate of blue light ensures that it only needs an output power of about 700W to achieve a temperature rise efficiency similar to that of a 6000W infrared ring light, and can heat the copper at the pin position from room temperature to 1300K within 0.1s. The blue light absorption rate does not increase sharply with temperature, which ensures that the entire heating process is very smooth and does not cause boiling problems caused by a sharp increase in absorption rate near the melting point of copper. The temperature rise curves of 700W blue light and 6000W infrared ring light are compared. Figure 12 shown.

[0090] Blue light requires only 700W of output power to achieve the same temperature rise as 6000W infrared light, significantly reducing equipment and energy costs. Blue light can achieve a temperature rise of over 1300K within 0.1s, effectively controlling heat accumulation during welding and preventing excessive damage to the paint in the heat-affected zone. Blue light's smooth overall temperature rise, without boiling or explosion, theoretically eliminates spatter, significantly improving product yield.

[0091] 8) The infrared Gaussian beam, with its inherent high energy density and the enhanced absorption rate imparted by blue light heating, provides sufficient penetration depth in the weld pool. Furthermore, the blue light provides steady heating, and the elevated temperature increases the infrared laser energy absorption rate in the copper layer, further enhancing effective penetration depth. Experimental verification has shown that, when combined with a 700W blue light, an infrared Gaussian beam of approximately 2000W can achieve a penetration depth exceeding 1.8mm, meeting the process requirements for pin welding.

[0092] 9) During welding, the laser beam spot size can be increased by setting a certain defocus value. This method can expand the molten pool range and reduce the energy density, thereby further reducing the risk of welding spatter.

[0093] Practical testing has shown that the welding time of this invention can be stably controlled within 1.8 seconds, the penetration depth can be controlled to above 1.8mm, and spatter is extremely low. This is based on the commonly used X-Pin pin sizes of 4mm*3.2mm*1.6mm, 3mm*2.65mm*2.2mm, and 4mm*3.5mm*2.4mm.

[0094] The pin size is 4mm*3.2mm*1.6mm. It takes 0.15s to achieve a cladding diameter of about 1.4mm, an effective penetration depth of about 1.9mm, a heat-affected zone of about 3.5mm, good paint loss, full and round welds, and no spatter.

[0095] The pin size is 3mm*2.65mm*2.2mm, and the welding time is 0.17s. The cladding diameter is about 2.7mm, the effective penetration depth is about 2.5mm, the heat-affected zone is about 3mm, the paint film is good with no loss, the weld point is full and round, and there is no spatter.

[0096] The pin size is 4mm*3.5mm*2.4mm, and the welding time is 0.18s. The cladding diameter is about 3.1mm, the effective penetration depth is about 2.8mm, the heat-affected zone is about 3.5mm, the paint film is good with no loss, the weld point is full and round, and there is no spatter.

[0097] In summary, the current mainstream X-Pin welding can be processed using the solution of the present invention and can achieve good processing results.

[0098] In addition, the present invention also includes the following solutions:

[0099] 1. Use blue light beam shaping to shape the blue light into a ring or other shape instead of a flat top beam.

[0100] 2. Use green light, blue light or other wavelength laser Gaussian beams to replace infrared Gaussian beams.

[0101] 3. In addition to the X-Pin motor, the red and blue composite beam is applied to the Hair-Pin and I-Pin motors.

[0102] The present invention provides a processing technology for welding X-Pin copper wire pins using a red and blue composite light source. Laser welding is completed along the welding track using infrared + blue light composite welding equipment under coaxial air blowing protection.

[0103] Blue laser welding heats up quickly, promoting copper's absorption of infrared laser light and avoiding the problem of drastic changes in copper's infrared absorption rate. Infrared lasers provide high energy density, ensuring effective penetration depths of 1.8mm or greater. Compared to ring infrared lasers, red-blue composite light sources not only offer lower light source costs but also achieve low spatter welding, significantly improving weld quality.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-spatter laser welding method for X-Pin motor stator pins, characterized in that: The method includes: S1. Configure a pin clamping tool and use the pin clamping tool to clamp and overlap the pins of the permanent magnet motor stator, specifically including: Setting a first tooling plate and a second tooling plate of a pin clamping tooling, and aligning the pins of the permanent magnet motor stator with the holes in the first tooling plate and the second tooling plate; using the starting tooling, overlapping the inner and outer ring pins of the permanent magnet motor stator facing each other; S2. Using a pre-configured composite laser welding lens, and based on the laser welding position, laser welding path, and anti-reverse mechanism, laser welding the pins of the permanent magnet motor stator; S3. Utilize the laser beam spot control mechanism to expand the molten pool range of laser welding and reduce the laser welding energy density; The pre-configured composite laser welding lens comprises a housing (1), a high-absorption rate beam guiding component (2) is provided in the middle of the housing (1), an auxiliary beam guiding component (3) is provided on one side of the housing (1), and an imaging component (4) is provided on the other side of the housing (1); a protective lens (5) is provided at the bottom of the housing (1), a composite light outlet (6) is provided at the bottom end of the protective lens (5), and a coaxial air blowing interface (7) is provided on one side of the protective lens (5); The high-absorption rate beam guiding assembly (2) comprises a high-absorption rate beam channel (201) arranged in the middle of the housing (1), a first collimating entrance (202) is provided at one end of the high-absorption rate beam channel (201), a first lens (203) and a second lens (204) are sequentially provided in the middle of the high-absorption rate beam channel (201), and the first lens (203) and the second lens (204) are used for reflecting and transmitting the light beam; The auxiliary beam guiding assembly (3) comprises an auxiliary beam channel (301) provided on one side of the housing (1); a third lens (302) is provided at a corner of the auxiliary beam channel (301); a second collimating entrance (303) is provided at one end of the auxiliary beam channel (301); the other end of the auxiliary beam channel (301) extends to the first lens (203); and a swing motor (304) is provided on one side of the third lens (302); The imaging assembly (4) comprises a camera optical path (401) arranged on the other side of the housing (1), a fourth lens (402) being arranged at a corner of the camera optical path (401), a camera (403) and an imaging lens (404) being arranged in sequence at one end of the camera optical path (401), and the other end of the camera optical path (401) extending to the second lens (204).

2. A low-spatter laser welding method for X-Pin motor stator pins according to claim 1, characterized in that: The laser welding positions include: The laser welding position is determined based on the principle of ensuring that the weld has effective penetration and uniform heat-affected zone.

3. The low-spatter laser welding method for X-Pin motor stator pins according to claim 1, characterized in that: The laser welding path includes: Covering the pins of the permanent magnet motor stator with a high absorption rate beam; setting the swing path and swing radius of the auxiliary beam according to the pin size of the permanent magnet motor stator; When the pins of the permanent magnet motor stator are heated separately, the path of the auxiliary light beam covers the pins of the permanent magnet motor stator; When the pins of the permanent magnet motor stator are heated in parallel, the path of the auxiliary light beam crosses the parallel pins.

4. The low-spatter laser welding method for X-Pin motor stator pins according to claim 1, characterized in that: The anti-counterfeiting mechanism includes: The pre-configured composite laser welding lens has a preset range of tilt angles relative to the vertical plane.

5. The low-spatter laser welding method for X-Pin motor stator pins according to claim 1, characterized in that: The laser beam spot control mechanism includes: Increase the laser beam spot size by setting the defocus amount.

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