A welding device for a cooling plate group and a welding process thereof

Abstract

This invention provides a welding device and welding process for a cooling plate assembly, comprising a worktable driven and connected by a translation mechanism, a loading fixture fixed on the worktable, a cooling plate assembly fixed on the loading fixture, and several positioning pins protruding from the loading fixture. The cooling plate assembly consists of a lower cover plate, a cooling plate body, and an upper cover plate stacked sequentially from bottom to top. The lower cover plate has several first positioning holes, and is placed on the loading fixture such that the first positioning holes correspond one-to-one with the positioning pins. The lower cover plate also has several upward-facing positioning protrusions. The cooling plate body has several corresponding second positioning holes, and is placed inside the lower cover plate such that the second positioning holes correspond one-to-one with the positioning protrusions. The upper cover plate covers the cooling plate body and the lower cover plate. A robotic arm is positioned beside the worktable, and a laser welding head and a shielding gas nozzle are mounted on the free end of the robotic arm, located above the worktable. This invention provides an efficient, precise, and stable solution.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, specifically a welding device and welding process for a cooling plate assembly. Background Technology

[0002] Currently, the welding of the cover plate and cooling plate adopts the in-furnace brazing process, which requires the investment of large brazing furnace equipment. The product also needs to be put into the brazing furnace with tooling. The operation is complicated and the production efficiency is low, mainly because: 1. Robotic arms are needed to assist in picking up and placing the product during welding; 2. The number of brazing auxiliary tooling required will increase exponentially; 3. The entire processing process requires a large amount of manpower and a large processing area.

[0003] To address the aforementioned issues, for example, Chinese patent literature has disclosed a method for laser welding aluminum alloy cooling plates [Chinese Patent No.: 202210034651.7]. This invention discloses a method for laser welding aluminum alloy cooling plates, comprising a worktable and fixture for fixing the aluminum alloy cooling plate to be welded. A welding robot is provided on one side of the worktable, and a laser oscillating welding head is installed on the welding robot. During welding, the aluminum alloy cooling plate is fixed by the worktable and fixture, and the welding robot drives the laser oscillating welding head to perform oscillating welding on the aluminum alloy cooling plate. The tail end of the weld is located inside an annular welding area. This structure, through a circular tail welding method, places the tail end of the weld inside a circle, thereby directing any cracks at the weld tail end into the circle. Even if cracks occur at the tail end, the circular welding ring will block the cracks around the area, thus preventing water leakage and ensuring the airtightness of the cooling plate.

[0004] Although the above technical solution discloses the welding operation of the welding robot on the cooling plate, its welding steps and methods are too simple and cannot realize the orderly welding process of multiple components. In addition, the specific welding process and methods are not disclosed, and the equipment and process still need to be further improved. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a welding device and welding process for a cooling plate assembly.

[0006] The objective of this invention can be achieved through the following technical solution: A welding device for a cooling plate assembly includes a worktable driven and connected by a translation mechanism. A loading fixture is fixed on the worktable, and a cooling plate assembly is fixed on the loading fixture. A plurality of positioning pins protrude from the loading fixture. The cooling plate assembly consists of a lower cover plate, a cooling plate body, and an upper cover plate stacked sequentially from bottom to top. A plurality of first positioning holes are formed on the lower cover plate. The lower cover plate is placed on the loading fixture such that the plurality of first positioning holes are correspondingly fitted with the plurality of positioning pins. A plurality of positioning protrusions protrude upward from the lower cover plate. A plurality of second positioning holes are correspondingly formed on the cooling plate body. The cooling plate body is placed inside the lower cover plate such that the plurality of second positioning holes are correspondingly fitted with the plurality of positioning protrusions. The upper cover plate covers the cooling plate body and the lower cover plate. A robotic arm is arranged beside the worktable. A laser welding head and a protective gas nozzle are mounted on the free end of the robotic arm. The laser welding head and the protective gas nozzle are located above the worktable.

[0007] In the welding device of the above-mentioned cooling plate assembly, the lower cover plate / the upper cover plate is a titanium-aluminum alloy plate, wherein the titanium content in the titanium-aluminum alloy plate is 70% to 90%, the aluminum content is 5% to 30%, and the remainder is chromium, copper, magnesium, silicon, and tin.

[0008] In the welding device for the cooling plate assembly described above, the translation mechanism includes a base frame, on which a translation motor is fixedly mounted. The translation motor drives a lead screw, and the lead screw has a threaded nut on its outer circumference. The nut is fixed to the bottom of the worktable. A guide rail parallel to the lead screw is fixed on the base frame, and a slider is fixed to the bottom of the worktable. The slider engages with the guide rail to form a sliding connection.

[0009] The welding process of the welding device for the cooling plate assembly includes the following steps:

[0010] S1. Place the upper cover plate, lower cover plate and cooling plate together into the ultrasonic degreasing tank for grease cleaning, then rinse the upper cover plate, lower cover plate and cooling plate in pure water, and finally dry the surface of the upper cover plate, lower cover plate and cooling plate.

[0011] S2. Place the lower cover plate on the material carrier fixture, and connect the first positioning holes on the lower cover plate with positioning pins to form a horizontal fixation. The positioning gap between the first positioning hole and the positioning pin is <0.1mm.

[0012] S3. Place the cooling plate on the lower cover plate, and fit the second positioning holes on the cooling plate with the positioning protrusions one by one to form a horizontal fixation. The assembly gap between the second positioning holes and the positioning protrusions is 0.1 to 0.2 mm.

[0013] S4. Turn on the laser welding head and shielding gas nozzle to weld at the contact position between the cooling plate and the lower cover plate. During welding, the laser beam melts the welding wire, the lower cover plate and the cooling plate to form a molten pool, so that the lower cover plate and the cooling plate are continuously welded and fixed together.

[0014] S5. Attach the upper cover plate to the lower cover plate and clamp the cooling plate inside the upper and lower cover plates. Turn on the laser welding head and the shielding gas nozzle to perform a closed-loop weld along the circumference of the lower and upper cover plates to complete the overall welding product.

[0015] In the welding process of the aforementioned cooling plate assembly welding device, in step S1, the ultrasonic cleaning frequency range is 20–50 kHz, and the ultrasonic energy density is 2–3 W / cm². 2 The ultrasonic cleaning time should be no less than 5 minutes, the rinsing time no less than 2 minutes, the drying temperature should be 80℃, and the drying time should be no less than 10 minutes.

[0016] In the welding process of the above-mentioned cooling plate assembly welding device, the cooling plate body includes two main plates spliced ​​together, and five auxiliary plates are arranged around the outer periphery of the two main plates. During welding, the periphery of the two main plates is first welded to form a circumferential weld, and then the five auxiliary plates are welded in sequence to form spot welds.

[0017] In the welding process of the above-mentioned welding device for the cooling plate assembly, the weld width between the lower cover plate and the cooling plate body is not less than 60% of the thickness of the cooling plate body, and the penetration rate of the weld depth is greater than 30% (or 0.8mm-1.2mm) of the cooling plate thickness.

[0018] In the welding process of the above-mentioned welding device for the cooling plate assembly, the welding wire is specifically ER5356 aluminum-magnesium welding wire, the welding wire standard is GB / T10858-SAI5356-AWS-A5.1 ER5356, and the welding wire composition is Mg=4.5-5.5%, Mn=0.05-0.20%, Cr=0.05-0.20%, Ti=0.06-0.20%, and the remainder is Al.

[0019] In the welding process of the above-mentioned welding device for the cooling plate assembly, the robotic arm drives the laser welding head and the protective gas nozzle to perform circular motion, while the worktable drives the material carrier fixture to perform linear motion. The combination of circular motion and linear motion forms a rotational scanning welding trajectory.

[0020] In the welding process of the aforementioned cooling plate assembly welding device, the robotic arm moves from any position to the pre-welding starting point, and rotates and scans at a radius of 0.5mm to 1.5mm and a linear speed of 2m / min to 6m / min, following the pattern of running the first semicircle and then the second semicircle. At the same time, the worktable moves in a straight line at a speed of 100mm / min to 500mm / min, so that the welding laser moves forward relative to the workpiece at a speed of 100mm / min to 500mm / min. The scanning welding trajectory of the welding laser forms a spiral trajectory on the workpiece.

[0021] Compared with existing technologies, the welding device and welding process of this cooling plate assembly have the following advantages:

[0022] 1. Precise positioning: The positioning pins on the material carrier fixture and the first positioning hole of the lower cover plate, the second positioning hole of the cooling plate body and the positioning protrusion of the lower cover plate are matched to ensure that the components of the cooling plate assembly can be precisely aligned during the welding process, reducing welding quality problems caused by positioning errors.

[0023] 2. Material optimization: Titanium-aluminum alloy plates are used as the top and bottom cover plates. The alloy plates have a high titanium content, which ensures the high strength and corrosion resistance of the welded parts. At the same time, the addition of aluminum provides good thermal conductivity, which is beneficial to the cooling effect.

[0024] 3. Improved Welding Quality: Laser welding technology enables fast welding speeds, clear molten pools, and excellent weld formation, ensuring the structural strength of the cooling plate assembly. Tensile and torsional tests of the welds show that the welding quality has reached a high standard.

[0025] 4. Highly Efficient Cleaning: Ultrasonic degreasing technology is used to pre-treat parts, effectively removing residual oil and improving welding quality. The principle of ultrasonic cleaning ensures that contaminants are rapidly dispersed in the cleaning solution, guaranteeing surface cleanliness of parts before welding.

[0026] 5. Handling structural complexity: Considering the structural design of the cooling plate, the main plate and the sub-plate were welded sequentially, which met the welding requirements of complex structures and improved welding efficiency.

[0027] 6. Automation and stability: The entire welding process is automated through the cooperation of the translation mechanism and the robotic arm, which improves production efficiency and welding stability.

[0028] In summary, this invention provides an efficient, precise, and stable solution for welding cooling plate assemblies, which not only meets the structural and functional requirements of cooling plate assemblies but also improves production efficiency and welding quality. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the positioning of the cover plate and the cooling plate body in the welding device of this cooling plate assembly.

[0030] In the figure, 1 is the material carrier fixture; 1a is the positioning pin; 2 is the lower cover plate; 2a is the positioning protrusion; 3 is the cooling plate; 3a is the main plate; and 3b is the secondary plate. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, the welding device for this cooling plate assembly includes a worktable driven and connected by a translation mechanism. A loading fixture 1 is fixed on the worktable, and a cooling plate assembly is fixed on the loading fixture 1. Several positioning pins 1a are protruding on the loading fixture 1. The cooling plate assembly is stacked from bottom to top as a lower cover plate 2, a cooling plate body 3, and an upper cover plate. Several first positioning holes are opened on the lower cover plate 2. The lower cover plate 2 is placed on the loading fixture 1 so that several positioning pins 1a are fitted one-to-one with several first positioning holes. Several positioning protrusions 2a are protruding upward on the lower cover plate 2. Several second positioning holes are opened on the cooling plate body 3. The cooling plate body 3 is placed inside the lower cover plate 2 so that several positioning protrusions 2a are fitted one-to-one with several second positioning holes. The upper cover plate covers the cooling plate body 3 and the lower cover plate 2. A robotic arm is set on the side of the worktable. A laser welding head and a protective gas nozzle are installed at the free end of the robotic arm. The laser welding head and the protective gas nozzle are located above the worktable.

[0034] The lower cover plate 2 / upper cover plate is made of titanium-aluminum alloy plate. The titanium-aluminum alloy plate contains 70% to 90% titanium, 5% to 30% aluminum, and the remainder is chromium, copper, magnesium, silicon and tin.

[0035] The translation mechanism includes a base frame, on which a translation motor is fixedly mounted. The translation motor drives a lead screw, with a nut threaded onto the outer circumference of the lead screw. The nut is fixed to the bottom of the worktable. A guide rail parallel to the lead screw is fixed to the base frame, and a corresponding slider is fixed to the bottom of the worktable, engaging with the guide rail to form a sliding connection. Starting the translation motor drives the lead screw to rotate forward and backward, and through the threaded engagement, the nut causes the worktable to slide back and forth along the guide rail.

[0036] The welding process of the welding device for the cooling plate assembly includes the following steps:

[0037] S1. Place the upper cover plate, lower cover plate 2 and cooling plate 3 together into the ultrasonic degreasing tank for grease cleaning, then place the upper cover plate, lower cover plate 2 and cooling plate 3 into pure water for rinsing, and finally dry the surface moisture of the upper cover plate, lower cover plate 2 and cooling plate 3.

[0038] S2. Place the lower cover plate 2 on the material carrier fixture 1, and connect the first positioning holes on the lower cover plate 2 to the positioning pins 1a one by one to form a horizontal fixation. The positioning gap between the first positioning hole and the positioning pin 1a is <0.1mm.

[0039] S3. Place the cooling plate 3 on the lower cover plate 2, and fit the second positioning holes on the cooling plate 3 into the positioning protrusions 2a one by one to form a horizontal fixation. The assembly gap between the second positioning holes and the positioning protrusions 2a is 0.1 to 0.2 mm.

[0040] S4. Turn on the laser welding head and the shielding gas nozzle to weld at the contact position between the cooling plate 3 and the lower cover plate 2. During welding, the laser beam melts the welding wire, the lower cover plate 2 and the cooling plate 3 to form a molten pool, so that the lower cover plate 2 and the cooling plate 3 are continuously welded and fixed together.

[0041] S5. Attach the upper cover plate to the lower cover plate 2, and clamp the cooling plate 3 inside the upper cover plate and the lower cover plate 2. Turn on the laser welding head and the protective gas nozzle to perform a closed-loop weld along the circumference of the lower cover plate 2 and the upper cover plate, thus completing the overall welding product.

[0042] In step S1, the ultrasonic cleaning frequency range is 20–50 kHz, and the ultrasonic energy density is 2–3 W / cm². 2 The ultrasonic cleaning time should be no less than 5 minutes, the rinsing time no less than 2 minutes, the drying temperature should be 80℃, and the drying time should be no less than 10 minutes.

[0043] The contaminants on the upper cover plate, lower cover plate 2, and cooling plate 3 are oil stains left over from the processing of the parts. The principle of ultrasonic cleaning is that the ultrasonic generator emits a high-frequency oscillation signal, which is converted into high-frequency mechanical oscillation by the transducer and propagates to the medium. The ultrasonic waves radiate forward in the cleaning fluid with alternating high and low density, causing the liquid to flow and generating tens of thousands of tiny bubbles. The tiny bubbles (air nuclei) existing in the liquid vibrate under the action of the sound field. When the sound pressure reaches a certain value, the bubbles grow rapidly and then suddenly collapse. When the bubbles collapse, they generate shock waves, creating thousands of atmospheres of pressure and hundreds of degrees of temperature. The explosive shock waves during the collapse break down insoluble contaminants, causing them to disperse in the cleaning fluid. When the particles are coated with oil and adhere to the surface of the cleaned parts, the oil is emulsified, and the solid particles are detached, thereby achieving the purpose of cleaning the surface of the cleaned parts.

[0044] The cooling plate 3 includes two main plates 3a that are spliced ​​together. Five secondary plates 3b are arranged around the periphery of the two main plates 3a. During welding, the periphery of the two main plates 3a is welded first to form a circumferential weld, and then the five secondary plates 3b are welded in sequence to form spot welds.

[0045] The weld width between the lower cover plate 2 and the cooling plate body 3 is not less than 60% of the plate thickness of the cooling plate body 3, and the penetration rate of the penetration depth is greater than 30% of the cooling plate thickness (or 0.8 mm - 1.2 mm). When conducting the tensile test on the weld, the tensile force ≥ 2.5 N, and it is required that the base metal cracks at the tensile fracture surface of the weld; when conducting the torsion test, the torsion value ≥ 1.2 N, and it is required that the base metal breaks at the torsion fracture surface of the weld; the above welding strength is considered qualified.

[0046] The welding wire is specifically ER5356 aluminum-magnesium welding wire, and the welding wire standard is GB / T10858 - SAI5356 - AWS - A5.1ER5356. The composition of the welding wire is Mg = 4.5 - 5.5%, Mn = 0.05 - 0.20%, Cr = 0.05 - 0.20%, Ti = 0.06 - 0.20%, and the rest is Al. ER5356 is an aluminum-magnesium alloy welding wire containing 5% magnesium and a small amount of titanium for grain refinement, with a melting point of 575 - 633 °C. It has good corrosion resistance and hot cracking resistance, good strength and forgeability. After the weld is anodized, it is white, which can provide good color matching for the welded joint. It is a general-purpose welding material with wide applications.

[0047] The aluminum-magnesium alloy welding wire can form high-quality welds during welding and has good welding performance. Since the welding wire contains a certain proportion of magnesium element, the alloy material after welding has relatively high strength and hardness. The welded aluminum alloy material has good corrosion resistance and can be used for a long time in humid, acidic, alkaline and other environments.

[0048] The robotic arm drives the laser welding head and the shielding gas nozzle to perform circular motion, and at the same time the workbench drives the loading fixture 1 to perform linear motion. The circular motion and the linear motion are combined to form a rotary scanning welding track. The robotic arm is controlled by a controller, and a control program for controlling the circular motion of the robotic arm is input into the controller, so as to make the welding laser beam generate a rotating action.

[0049] The robotic arm moves from any position to the pre-welding starting point, and in the way of running the first semi-circle first and then the second semi-circle, the robotic arm performs rotary scanning with a radius of 0.5 mm - 1.5 mm and a linear velocity of 2 m / min - 6 m / min. At the same time, the workbench moves linearly at a speed of 100 mm / min - 500 mm / min, so that the welding laser advances relative to the workpiece at a speed of 100 mm / min - 500 mm / min, and the scanning welding track of the welding laser forms a spiral track on the workpiece.

[0050] Compared with the prior art, the welding device and the welding process of this cooling plate group have the following beneficial effects:

[0051] 1. Precise positioning: The positioning pins on the material carrier fixture and the first positioning hole of the lower cover plate, the second positioning hole of the cooling plate body and the positioning protrusion of the lower cover plate are matched to ensure that the components of the cooling plate assembly can be precisely aligned during the welding process, reducing welding quality problems caused by positioning errors.

[0052] 2. Material optimization: Titanium-aluminum alloy plates are used as the top and bottom cover plates. The alloy plates have a high titanium content, which ensures the high strength and corrosion resistance of the welded parts. At the same time, the addition of aluminum provides good thermal conductivity, which is beneficial to the cooling effect.

[0053] 3. Improved Welding Quality: Laser welding technology enables fast welding speeds, clear molten pools, and excellent weld formation, ensuring the structural strength of the cooling plate assembly. Tensile and torsional tests of the welds show that the welding quality has reached a high standard.

[0054] 4. Highly Efficient Cleaning: Ultrasonic degreasing technology is used to pre-treat parts, effectively removing residual oil and improving welding quality. The principle of ultrasonic cleaning ensures that contaminants are rapidly dispersed in the cleaning solution, guaranteeing surface cleanliness of parts before welding.

[0055] 5. Handling structural complexity: Considering the structural design of the cooling plate, the main plate and the sub-plate were welded sequentially, which met the welding requirements of complex structures and improved welding efficiency.

[0056] 6. Automation and stability: The entire welding process is automated through the cooperation of the translation mechanism and the robotic arm, which improves production efficiency and welding stability.

[0057] In summary, this invention provides an efficient, precise, and stable solution for welding cooling plate assemblies, which not only meets the structural and functional requirements of cooling plate assemblies but also improves production efficiency and welding quality.

[0058] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0059] Although this document frequently uses terms such as material carrier jig 1; positioning pin 1a; lower cover plate 2; positioning protrusion 2a; cooling plate 3; main plate 3a; and secondary plate 3b, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A welding process for a welding device for a cooling plate assembly, comprising a worktable driven and connected by a translation mechanism, a loading fixture fixed on the worktable, a cooling plate assembly fixed on the loading fixture, a plurality of positioning pins protruding from the loading fixture, the cooling plate assembly consisting of a lower cover plate, a cooling plate body, and an upper cover plate stacked sequentially from bottom to top, the lower cover plate having a plurality of first positioning holes, the lower cover plate being placed on the loading fixture such that the plurality of first positioning holes correspond one-to-one with the plurality of positioning pins, the lower cover plate having a plurality of positioning protrusions protruding upwards, the cooling plate body having a plurality of corresponding second positioning holes, the cooling plate body being placed inside the lower cover plate such that the plurality of second positioning holes correspond one-to-one with the plurality of positioning protrusions, and the upper cover plate covering the cooling plate assembly. The worktable includes a plate and a lower cover plate. A robotic arm is installed beside the worktable, with a laser welding head and a protective gas nozzle mounted on the free end of the robotic arm. The laser welding head and the protective gas nozzle are located above the worktable. The lower cover plate / upper cover plate is made of titanium-aluminum alloy, with a titanium content of 70%–90%, an aluminum content of 5%–30%, and the remainder being titanium, copper, magnesium, silicon, and tin. The translation mechanism includes a base frame, on which a translation motor is fixed. The translation motor drives a lead screw, which is threaded around its outer periphery and fitted with a nut. The nut is fixed to the bottom of the worktable. A guide rail parallel to the lead screw is fixed on the base frame, and a slider is correspondingly fixed to the bottom of the worktable. The slider engages with the guide rail to form a sliding connection. The welding process of the welding device of the cooling plate group is characterized in that, Includes the following steps: S1. Place the upper cover plate, lower cover plate and cooling plate together into the ultrasonic degreasing tank for grease cleaning, then rinse the upper cover plate, lower cover plate and cooling plate in pure water, and finally dry the surface of the upper cover plate, lower cover plate and cooling plate. S2. Place the lower cover plate on the material carrier fixture, and connect the first positioning holes on the lower cover plate with positioning pins to form a horizontal fixation. The positioning gap between the first positioning hole and the positioning pin is <0.1mm. S3. Place the cooling plate on the lower cover plate, and fit the second positioning holes on the cooling plate with the positioning protrusions one by one to form a horizontal fixation. The assembly gap between the second positioning holes and the positioning protrusions is 0.1 to 0.2 mm. S4. Turn on the laser welding head and shielding gas nozzle to weld at the contact position between the cooling plate and the lower cover plate. During welding, the laser beam melts the welding wire, the lower cover plate and the cooling plate to form a molten pool, so that the lower cover plate and the cooling plate are continuously welded and fixed together. The welding wire is specifically ER5356 aluminum-magnesium welding wire, with a composition of Mg=4.5-5.5%, Mn=0.05-0.20%, Cr=0.05-0.20%, Ti=0.06-0.20%, and the remainder being Al; S5. Fasten the upper cover plate onto the lower cover plate, and clamp the cooling plate inside the upper and lower cover plates. Turn on the laser welding head and the shielding gas nozzle to perform a closed-loop weld along the circumference of the lower and upper cover plates to complete the overall welding product. The cooling plate body includes two main plates spliced ​​together. Five auxiliary plates are arranged around the outer periphery of the two main plates. During welding, the periphery of the two main plates is welded first to form a circumferential weld, and then the five auxiliary plates are welded in sequence to form a spot weld. The robotic arm drives the laser welding head and the protective gas nozzle to perform a circular motion, while the worktable drives the material carrier fixture to perform a linear motion. The circular motion and the linear motion combine to form a rotational scanning welding trajectory.

2. The welding process of the welding apparatus of the cooling plate set according to claim 1, wherein, In step S1, the ultrasonic cleaning frequency range is 20-50kHz, the ultrasonic energy density is 2-3W / CM², the ultrasonic cleaning time is not less than 5 minutes, the rinsing time is not less than 2 minutes, the drying temperature is 80℃, and the drying time is not less than 10 minutes.

3. The welding process of the welding apparatus of the cooling plate set according to claim 1, wherein, The weld width between the lower cover plate and the cooling plate body is not less than 60% of the thickness of the cooling plate body, and the penetration depth is greater than 30% of the thickness of the cooling plate body.

4. The welding process of the welding apparatus of the cooling plate set according to claim 1, wherein, The robotic arm moves from any position to the pre-welding starting point and rotates in a circular motion, first running one semicircle and then the next, with a radius of 0.5mm to 1.5mm and a linear speed of 2m / min to 6m / min. At the same time, the worktable moves in a straight line at a speed of 100mm / min to 500mm / min, so that the welding laser moves forward relative to the workpiece at a speed of 100mm / min to 500mm / min. The scanning welding trajectory of the welding laser forms a spiral trajectory on the workpiece.

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