Welding method of aluminum profile water channel plate and aluminum profile water channel plate

Abstract

The invention discloses a welding method of an aluminum profile water channel plate, which can preset differentiated welding processes and parameters according to different plate thicknesses and different edge shapes of all areas, and can achieve the purpose of welding the water channel plate by switching different welding processes aiming at different plate thickness areas and switching different process parameters aiming at different edge shapes. Welding deformation of products can be effectively reduced, and the service life of the products is prolonged. In addition, the invention further discloses the aluminum profile water channel plate formed by adopting the welding method of the aluminum profile water channel plate.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding method for aluminum profile water channel plates and the aluminum profile water channel plate itself. Background Technology

[0002] In related technologies, with the development of new energy vehicles, the structural design of their lower housings has gradually evolved from a water-cooled plate + aluminum profile frame structure to an aluminum profile water channel plate structure with an integrated cavity cooling system on the aluminum profile base plate. The aluminum profile water channel plate includes a base plate and plugs. The base plate has a cavity for coolant flow, and the plugs are located at the edge of the base plate to seal the cavity. The main advantages of this structure include higher integration, higher structural strength, stronger safety protection, and lower cost. While the aluminum profile water channel plate has significant structural advantages, it also places high demands on assembly and welding. Specifically, during processing, plugs need to be welded to the edge of the base plate to seal the cavity. This structure typically requires two welding operations between the plugs and the edge of the base plate, which not only carries a high risk of weld undercut but also the risk of weld collapse affecting the internal flow channels and easily leading to large product deformation. Furthermore, repeated welding and heating can cause poor airtightness and low edge strength, seriously affecting the product's functional assembly and service life. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a welding method for aluminum profile water channel plates, which can reduce product deformation and extend product service life.

[0004] The present invention also proposes an aluminum profile water channel plate using the above-mentioned welding method.

[0005] A welding method for an aluminum profile water channel plate according to a first aspect embodiment of the present invention includes the following steps: S1: Assemble and obtain a workpiece, the workpiece including a base plate and a plug, the base plate having a cavity extending to the edge of the base plate, the edge of the base plate including a first edge portion and a second edge portion located on opposite sides of the cavity, the plug being inserted between the first edge portion and the second edge portion and sealing the cavity; S2: Positioning, placing the assembled workpiece into the positioning fixture, and clamping the base plate with a jig; S3: Partitioning, dividing the edge of the workpiece into a first region, a second region and a third region in the thickness direction of the workpiece, wherein the first region at least partially covers the first edge portion, the second region is located at the plug, and the third region at least partially covers the second edge portion; S4: Welding, the welding torch moves along the edge of the workpiece and makes a periodic oscillating motion in the thickness direction of the workpiece, and the oscillation path spans the first region, the second region and the third region. CMT welding process is used in the first region and the third region, and pulsed MIG welding process is used in the second region. The welding heat input in the first region and the third region is less than the welding heat input in the second region. In the length direction of the workpiece, the edge of the workpiece has a first straight segment, a first arc segment, a second arc segment, and a second straight segment connected in sequence. The first arc segment is an outwardly convex arc, and the second arc segment is an inwardly concave arc. During welding, the welding torch passes through the first straight segment, the first arc segment, the second arc segment, and the second straight segment in sequence. When the welding torch passes through the first arc segment, the welding heat input is reduced; When the welding torch passes through the second arc segment, the welding heat input is increased; When the welding torch passes through the second straight segment, the welding heat input is reduced.

[0006] The welding method for aluminum profile water channel plates according to embodiments of the present invention has at least the following beneficial effects: In the welding method for aluminum profile water channel plates in this embodiment of the invention, the edge of the workpiece is divided into a first region, a second region, and a third region in the thickness direction of the workpiece. During welding, the welding torch is moved along the edge of the workpiece and makes a periodic oscillating motion in the thickness direction of the workpiece, and the oscillation path spans the first, second, and third regions. Since the first and second edge portions are relatively thin, CMT welding process is used in the first and third regions. CMT welding process, with its extremely low heat input and almost no spatter characteristics, produces a soft and stable arc, which can minimize defects such as deformation, burn-through, collapse, and undercut caused by excessive heat input in the first and second edge portions. Since the plug plate is relatively thick, when the welding torch oscillates from the first or third region to the second region, it switches to pulsed MIG welding process, outputting preset high heat input parameters. At this time, the arc becomes a strong and powerful pulse state. The pulsed arc provides high energy density and strong arc force, which can increase the effective penetration depth at the plug position, realize deep penetration welding between the plug and the base plate, and form a full weld shape. This allows for customized welding processes based on the varying thicknesses of different areas, effectively reducing welding deformation and extending product lifespan. Furthermore, because the workpiece edge features an outward-protruding first arc segment and an inward-recessed second arc segment, reducing the welding heat input when the welding torch moves from the first straight segment to the first arc segment lowers the risk of burn-through failure due to the concentrated heat at the arc's center point. When the welding torch moves from the first arc segment to the second arc segment, increasing the welding heat input ensures weld quality. Conversely, reducing the welding heat input when moving from the second arc segment to the second straight segment ensures consistent weld quality and fusion. Therefore, different welding parameters can be adjusted for different edge shapes, significantly improving weld quality and extending product lifespan.

[0007] According to some embodiments of the present invention, in step S3, in the thickness direction of the workpiece, the first region covers the first edge portion and extends to cover the plug portion, and the second region covers the second edge portion and extends to cover the plug portion.

[0008] According to some embodiments of the present invention, in the thickness direction of the workpiece, the thickness of the first edge portion and the second edge portion is 1.5-3mm, the thickness of the plug is 5-10mm, and the thickness of the first region and the third region is 2-4mm. In step S4, the welding torch makes a periodic oscillating motion with a sinusoidal waveform in the thickness direction of the workpiece, with the center line of the plug as the center and the oscillation frequency being 3.5-4.0 Hz and the oscillation amplitude of the welding torch being 3-8 mm.

[0009] According to some embodiments of the present invention, in step S4, the welding heat input of the CMT welding process is 0.15-0.2 kJ / mm, and the welding heat input of the pulsed MIG welding process is 0.33-0.45 kJ / mm.

[0010] According to some embodiments of the present invention, in step S4, The welding current for CMT welding is 65-70A, the welding voltage is 12.3-12.8V, and the welding speed is 7-9mm / s. The peak current of the pulsed MIG welding process is 200A, the base current is 60A, the frequency is 80Hz, and the welding speed is 7-9mm / s.

[0011] According to some embodiments of the present invention, in step S4, when the welding torch moves from the first straight segment to the first arc segment, the welding heat input is reduced by increasing the wire feed speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed. When the welding torch moves from the first arc segment to the second arc segment, the welding heat input is increased by reducing the wire feed speed of the CMT welding process and / or increasing the pulse peak current and / or reducing the welding speed. When the welding torch moves from the second arc segment to the second straight segment, the welding heat input is reduced by increasing the wire feed speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed.

[0012] According to some embodiments of the present invention, in step S4, When the welding torch moves from the first straight section to the first arc section, the wire feed speed of the CMT welding process is increased by 10%-30%, and / or the pulse peak current is increased by 40-80A, and / or the welding speed is increased by 15%-35%, so as to reduce the welding heat input by 15%-35%. When the welding torch moves from the first arc segment to the second arc segment, the wire feed speed of the CMT welding process is reduced by 10%-30%, and / or the pulse peak current is reduced by 40-80A, and / or the welding speed is reduced by 15%-35%, so as to increase the welding heat input by 15%-35%. When the welding torch moves from the second arc segment to the second straight segment, the wire feed speed of the CMT welding process is increased by 10%-30% and / or the pulse peak current is increased by 40-80A, and / or the welding speed is increased by 15%-35%, so as to reduce the welding heat input by 15%-35%.

[0013] According to some embodiments of the present invention, in step S4, the welding torch is moved by the welding robot unit to perform welding; The welding robot unit includes: A six-axis industrial robot used to drive a welding torch to move along a preset trajectory; The welding power supply has two welding process modes: CMT and pulsed MIG, and can switch between the two welding process modes. Wire feeding mechanism for feeding welding wire to the welding gun; The central control unit, using a PLC or industrial computer, pre-stores all welding programs and can synchronously coordinate the movement of the six-axis industrial robot and the output of the welding power supply. A position sensing unit is installed at the tip of the welding torch. The position sensing unit is used to track the position of the welding torch tip relative to the weld trajectory and feed the position information back to the central control unit. The central control unit can determine the position of the welding torch based on the position information fed back by the position sensing unit and control the output of the welding power supply. When the tip of the welding torch swings to the first region or the third region, the central control unit controls the welding power supply to switch to CMT welding process mode. When the tip of the welding torch swings to the second region, the central control unit controls the welding power supply to switch to pulsed MIG welding process mode.

[0014] According to some embodiments of the present invention, step S1 includes: S1.1: Obtain the base plate and the plug, wherein the base plate has a cavity extending to the edge of the base plate, and the edge of the base plate includes a first edge portion and a second edge portion located on opposite sides of the cavity; S1.2: Wipe the surface of the base plate with ethanol; S1.3: Use a stainless steel wire brush with a diameter of 0.15-0.2mm to polish the first edge, the second edge, and the outer surface of the plug. S1.4: Insert the plug between the first edge portion and the second edge portion to seal the cavity. The plug and the base plate are interference-fitted with an interference amount of less than 0.05 mm.

[0015] According to a second aspect embodiment of the present invention, the aluminum profile water channel plate is formed by welding the aluminum profile water channel plate of any of the above embodiments.

[0016] The aluminum profile water channel plate according to embodiments of the present invention has at least the following beneficial effects: By using the welding method of aluminum profile water channel plate in any of the above embodiments to process aluminum profile water channel plate, during the welding process, different welding processes and parameters can be preset according to the different plate thicknesses and edge shapes of each area. Thus, by switching different welding processes for different plate thickness areas, the welding deformation of the product can be effectively reduced and the service life of the product can be extended.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the welding of the aluminum profile waterway plate according to an embodiment of the present invention; Figure 2 This is another welding schematic diagram of the aluminum profile water channel plate according to an embodiment of the present invention; Figure 3 This is an exploded view of the aluminum profile water channel plate according to an embodiment of the present invention; Figure 4 This is a schematic diagram of an aluminum profile water channel plate according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the edge partitioning of the aluminum profile water channel plate according to an embodiment of the present invention.

[0019] Figure label: Workpiece 100, first region 101, second region 102, third region 103, base plate 110, first edge portion 111, second edge portion 112, cavity 113, plug 120, first straight segment 130, first arc segment 140, second arc segment 150, second straight segment 160; Welding torch 200; Positioning fixture 300, clamp 310, stop block 320; Swing path 400. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Reference Figures 1 to 5 An embodiment of the present invention provides a welding method for an aluminum profile water channel plate, comprising the following steps: S1: Assembly, obtaining a workpiece 100, the workpiece 100 including a base plate 110 and a plug 120, the base plate 110 having a cavity 113 extending to the edge of the base plate 110, the edge of the base plate 110 including a first edge portion 111 and a second edge portion 112 located on opposite sides of the cavity 113, the plug 120 being inserted between the first edge portion 111 and the second edge portion 112 and sealing the cavity 113; S2: Positioning, the assembled workpiece 100 is placed into the positioning fixture 300, and the base plate 110 is clamped by the fixture 310; S3: Partitioning, in the thickness direction of the workpiece 100, the edge of the workpiece 100 is divided into a first region 101, a second region 102 and a third region 103, the first region 101 at least partially covers the first edge portion 111, the second region 102 is located at the plug 120, and the third region 103 at least partially covers the second edge portion 112. S4: Welding, the welding torch 200 moves along the edge of the workpiece 100 and makes a periodic oscillating motion in the thickness direction of the workpiece 100, and the oscillation path 400 spans the first region 101, the second region 102 and the third region 103. CMT welding process is used in the first region 101 and the third region 103, and pulsed MIG welding process is used in the second region 102. The welding heat input of the first region 101 and the third region 103 is less than the welding heat input of the second region 102. In the length direction of the workpiece 100, the edge of the workpiece 100 has a first straight segment 130, a first arc segment 140, a second arc segment 150, and a second straight segment 160 connected in sequence. The first arc segment 140 is an outwardly convex arc, and the second arc segment 150 is an inwardly concave arc. During welding, the welding torch 200 passes through the first straight segment 130, the first arc segment 140, the second arc segment 150, and the second straight segment 160 in sequence. When the welding torch 200 passes through the first arc segment 140, the welding heat input is reduced; When the welding torch 200 passes through the second arc segment 150, the welding heat input is increased; When the welding torch 200 passes through the second straight segment 160, the welding heat input is reduced.

[0026] In the welding method of aluminum profile water channel plate in this embodiment of the invention, since the first edge portion 111 and the second edge portion 112 on both sides of the cavity 113 are relatively thin, they are prone to deformation or even internal collapse during the welding process. By dividing the edge of the workpiece 100 into a first region 101, a second region 102 and a third region 103 in the thickness direction of the workpiece 100, the welding torch 200 is moved along the edge of the workpiece 100 and makes a periodic oscillating motion in the thickness direction of the workpiece 100 during welding. The oscillation path 400 spans the first region 101, the second region 102 and the third region 103. CMT welding process is used in the first region 101 and the third region 103, and pulsed MIG welding process is used in the second region 102. The welding heat input of the first region 101 and the third region 103 is less than the welding heat input of the second region 102. In this method, since the first edge portion 111 and the second edge portion 112 are relatively thin, CMT welding technology is used in the first region 101 and the third region 103. CMT welding technology, with its extremely low heat input and near-no-spatter characteristics, produces a soft and stable arc. In the first region 101 and the third region 103, it can minimize defects such as deformation, burn-through, collapse, and undercut caused by excessive heat input in the first edge portion 111 and the second edge portion 112, achieving safe and high-quality deposition of the thin plate. Since the stopper block 120 is relatively thick, when the welding torch 200 swings from the first region 101 or the third region 103 to the second region 102, it switches to pulsed MIG welding technology, outputting preset high heat input parameters. At this time, the arc becomes a strong pulse state. The pulsed arc provides high energy density and strong arc force, which can increase the effective penetration depth at the stopper block 120 position, achieving deep penetration welding between the stopper block 120 and the base plate 110, and forming a full weld shape. Therefore, the welding method of the aluminum profile water channel plate in this embodiment of the invention can preset different welding processes according to the different plate thicknesses in each area. By switching different welding processes for different plate thickness areas, the welding deformation of the product can be effectively reduced and the service life of the product can be extended.

[0027] Furthermore, in the welding method for the aluminum profile water channel plate of this embodiment, since the edge of the workpiece 100 has an outwardly protruding first arc segment 140 and an inwardly concave second arc segment 150, when the welding torch 200 passes through the first arc segment 140, because the first arc segment 140 is an outwardly protruding outer arc, the welding heat will concentrate at the center point of the arc. Therefore, it is necessary to ensure sufficient heating area to prevent burn-through failure. Therefore, when the welding torch 200 moves from the first straight segment 130 to the first arc segment 140, by reducing the welding heat input, the risk of burn-through failure due to the large concentration of welding heat at the center point of the arc in the first arc segment 140 can be reduced. When the welding torch 200 passes through the second arc segment, because the second arc segment is an inwardly concave inner arc, the arc direction during welding presents a divergent structure. Therefore, when the welding torch 200 moves from the first arc end to the second arc segment 150, the welding heat input can be increased to ensure welding quality. When the welding torch 200 passes through the second straight segment 160, the temperature of the welding area of ​​the entire workpiece 100 will rise significantly due to the welding process in the first three segments. Therefore, when the welding torch 200 moves from the second arc segment to the second straight segment 160, the welding heat input can be reduced to ensure welding quality and fusion consistency. Thus, the welding method for the aluminum profile waterway plate of this embodiment can adjust different welding parameters for different edge shapes, thereby greatly improving welding quality and extending product lifespan.

[0028] As is understandable, CMT welding refers to cold metal over-welding, a process that significantly reduces heat generation and conduction of welding heat within the workpiece. Furthermore, this process achieves better weld thickness transition, offers high welding speeds without spatter, greatly improves welding productivity, and effectively ensures the weld quality of the workpiece.

[0029] Reference Figures 1 to 5 In some embodiments, in step S3, in the thickness direction of the workpiece 100, the first region 101 covers the first edge portion 111 and extends to cover the plug portion 120, and the second region 102 covers the second edge portion 112 and extends to cover the plug portion 120. Thus, when welding the first region 101 or the third region 103, the low-temperature range of the CMT welding process can slightly cover the edge of the plug portion 120, ensuring good fusion of the bonding line while protecting the first edge portion 111 and the second edge portion 112 from overheating.

[0030] Reference Figures 1 to 5In some embodiments, in the thickness direction of the workpiece 100, the thickness of the first edge portion 111 and the second edge portion 112 is 1.5-3 mm, the thickness of the plug 120 is 5-10 mm, and the thickness of the first region 101 and the third region 103 is 2-4 mm; in step S4, the welding torch 200 performs a periodic oscillating motion with a sinusoidal waveform centered on the center line of the plug 120 in the thickness direction of the workpiece 100, and the trajectory of the oscillation path 400 is as follows: Figure 5 As shown, the oscillation frequency is 3.5-4.0 Hz, and the oscillation amplitude of the welding torch 200 is 3-8 mm. Therefore, both the first region 101 and the second region 102 can extend to cover the plug 120, and the low-temperature range of the CMT welding process slightly covers part of the plug 120, which helps ensure good fusion of the bonding line and greatly improves the welding quality.

[0031] It is understood that in some embodiments, the thickness of the first edge portion 111 and the second edge portion 112 in the thickness direction of the workpiece 100 is 1.5 mm, the thickness of the plug 120 is 5 mm, and the thickness of the first region 101 and the third region 103 is 2 mm; in step S4, the welding torch 200 performs a periodic oscillating motion with a sinusoidal waveform centered on the center line of the plug 120 in the thickness direction of the workpiece 100, and the trajectory of the oscillation path 400 is as follows: Figure 5 As shown, the oscillation frequency is 3.5-4.0 Hz, and the oscillation amplitude of the welding torch 200 is 3-3.5 mm. Therefore, both the first region 101 and the second region 102 can extend to cover the plug 120, and the low-temperature range of the CMT welding process slightly covers part of the plug 120, which helps ensure good fusion of the bonding line and greatly improves the welding quality.

[0032] In some embodiments, in step S4, the welding heat input of the CMT welding process is 0.15-0.2 kJ / mm, and the welding heat input of the pulsed MIG welding process is 0.33-0.45 kJ / mm. This allows for the pre-setting of differentiated welding processes and parameters based on the different plate thicknesses in each region, resulting in a significantly higher welding heat input in the second region 102 than in the first and second regions 101 and 102 on both sides; that is, the heat input in the thicker plate region is significantly higher than that in the thinner plate regions on both sides. Specifically, since both the first edge portion 111 and the second edge portion 112 are 1.5 mm thick ultra-thin plates, the CMT welding process is used in the first region 101 and the third region 103, with a welding heat input of 0.15-0.2 kJ / mm. The CMT process, with its extremely low heat input and near-no-splatter characteristics, perfectly avoids burn-through, collapse, and undercut defects in the 1.5 mm ultra-thin plate in this region. Since the plug 120 is a 5mm thick plate, the second region 102 is treated with pulsed MIG process with a welding heat input of 0.33-0.45kJ / mm. The pulsed arc provides high energy density and strong arc force, which can ensure sufficient penetration for the 8mm thick plate, avoid incomplete fusion, and form a full weld shape.

[0033] In some embodiments, in step S4, the welding current of the CMT welding process is 65-70A, the welding voltage is 12.3-12.8V, and the welding speed is 7-9mm / s; the peak current of the pulsed MIG welding process is 200A, the base current is 60A, the frequency is 80Hz, and the welding speed is 7-9mm / s. This allows for more precise pre-setting of differentiated welding processes and parameters based on the varying plate thicknesses in different areas, which helps to further avoid burn-through, collapse, and undercut defects in the first edge portion 111 and the second edge portion 112, and improves the welding quality between the plug block 120 and the first edge portion 111 and the second edge portion 112.

[0034] In some embodiments, in step S4 When the welding torch 200 moves from the first straight section 130 to the first arc section 140, the welding heat input is reduced by increasing the wire feed speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed. When the welding torch 200 moves from the first arc segment 140 to the second arc segment 150, the welding heat input is increased by reducing the wire feed speed of the CMT welding process and / or increasing the pulse peak current and / or reducing the welding speed. When the welding torch 200 moves from the second arc segment 150 to the second straight segment 160, the welding heat input is reduced by increasing the wire feed speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed.

[0035] In the above method, the welding heat input can be increased or decreased by changing the welding parameters. Specifically, when the welding torch 200 moves from the first straight segment 130 to the first arc segment 140, the welding heat input can be reduced by increasing the wire feed speed of the CMT welding process and / or decreasing the pulse peak current and / or increasing the welding speed. This reduces the risk of burn-through failure in the first arc segment 140 due to the large concentration of welding heat at the arc center point. When the welding torch 200 moves from the first arc segment 140 to the second arc segment 150, the welding heat input can be increased by decreasing the wire feed speed of the CMT welding process and / or increasing the pulse peak current and / or decreasing the welding speed. This avoids insufficient heat input caused by the divergent arc direction during welding in the second arc segment, which is beneficial for improving welding quality. When the welding torch 200 moves from the second arc segment 150 to the second straight segment 160, the welding heat input is reduced by increasing the wire feeding speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed. This avoids the overheating that occurs in the fourth welding segment due to the significant temperature rise in the welding area of ​​the entire workpiece 100 caused by the first three welding processes, which helps to ensure welding quality and fusion consistency.

[0036] In some embodiments, in step S4 When the welding torch 200 moves from the first straight section 130 to the first arc section 140, the wire feed speed of the CMT welding process is increased by 10%-30%, and / or the pulse peak current is increased by 40-80A, and / or the welding speed is increased by 15%-35%, so as to reduce the welding heat input by 15%-35%. When the welding torch 200 moves from the first arc segment 140 to the second arc segment 150, the wire feed speed of the CMT welding process is reduced by 10%-30%, and / or the pulse peak current is reduced by 40-80A, and / or the welding speed is reduced by 15%-35%, so as to increase the welding heat input by 15%-35%. When the welding torch 200 moves from the second arc segment 150 to the second straight segment 160, the wire feed speed of the CMT welding process is increased by 10%-30% and / or the pulse peak current is increased by 40-80A, and / or the welding speed is increased by 15%-35%, so as to reduce the welding heat input by 15%-35%.

[0037] By adopting the above method, different welding parameters can be selected more accurately according to different sections, which is conducive to further ensuring welding quality.

[0038] In some embodiments, in step S4, the welding torch 200 is moved by a welding robot unit to perform welding; wherein the welding robot unit includes: A six-axis industrial robot is used to drive the welding torch 200 to move along a preset trajectory. The welding power supply has two welding process modes: CMT and pulsed MIG, and can switch between the two welding process modes. A wire feeding mechanism for feeding welding wire into the welding torch 200; The central control unit, using a PLC or industrial computer, pre-stores all welding programs and can synchronously coordinate the movement of the six-axis industrial robot and the output of the welding power supply. The position sensing unit is installed at the tip of the welding torch 200. The position sensing unit is used to track the position of the tip of the welding torch 200 relative to the weld trajectory and feed the position information back to the central control unit. The central control unit can determine the position of the welding torch 200 and control the output of the welding power supply based on the position information fed back by the position sensing unit. When the tip of the welding torch 200 swings to the first zone 101 or the third zone 103, the central control unit controls the welding power supply to switch to the CMT welding process mode. When the tip of the welding torch 200 swings to the second zone 102, the central control unit controls the welding power supply to switch to the pulse MIG welding process mode.

[0039] In the above structure, the central control unit can determine the position of the welding torch 200 in real time based on the position information fed back by the position sensing unit. Based on this position determination, the central control unit can issue an instant switching command to the welding power source, thereby controlling the dynamic changes in the welding process. When the welding torch 200 swings to the first region 101 or the third region 103, the system immediately triggers the CMT welding process and outputs the preset low-heat input parameters. At this time, the arc is gentle and stable, achieving safe and high-quality deposition on thin plates. When the welding torch 200 swings from the first region 101 or the third region 103 into the second region 102, the system switches the welding process to pulse MIG mode within milliseconds, outputting the preset high-heat input parameters. At this time, the arc becomes a strong and powerful pulse state, achieving deep penetration welding on thick plates. This "sensing-judgment-switching" process is automatically, accurately, and cyclically performed with each reciprocating swing of the welding torch 200 between the three regions: the first region 101, the second region 102, and the third region 103. Within a complete oscillation cycle, the process undergoes two switching cycles: "CMT → Pulse MIG → CMT", thereby achieving "customized" welding for different plate thicknesses on a continuous weld seam.

[0040] Understandably, the central control unit can determine the position of the welding torch 200 and control the output of the welding power supply based on the position information fed back by the position sensing unit. Specifically, the position coordinates of transition points P1 and P2 can be pre-stored in the program, where P1 refers to the transition point between the first region 101 and the second region 102, and P2 refers to the transition point between the second region 102 and the third region 103. The position sensing unit can monitor and feed back the precise spatial coordinates of the tip of the welding torch 200 to the central control unit in real time. The central control unit compares this coordinate with the pre-stored transition point P1 and P2 positions in the program at high speed, thereby determining in real time which region the welding torch 200 is currently in among the first region 101, the second region 102, and the third region 103. Based on this position determination, the central control unit sends an immediate switching command to the welding power supply to control the dynamic changes in the welding process.

[0041] It is understood that the position sensing unit can be a laser vision sensor, or other types of position sensors, and the present invention does not specifically limit the use of such sensors.

[0042] In some embodiments, step S1 includes: S1.1: Obtain the base plate 110 and the plug 120. The base plate 110 has a cavity 113 extending to the edge of the base plate 110. The edge of the base plate 110 includes a first edge portion 111 and a second edge portion 112 located on opposite sides of the cavity 113. S1.2: Wipe the surface of the base plate 110 with ethanol to remove oil stains and other foreign matter from the surface of the base plate 110; S1.3: Use a stainless steel wire brush with a diameter of 0.15-0.2mm to polish the outer surface of the first edge 111, the second edge 112 and the plug 120 until a metallic luster is exposed. S1.4: Insert the plug 120 between the first edge portion 111 and the second edge portion 112 and seal the cavity 113. The plug 120 and the base plate 110 are interference-fitted with an interference amount of less than 0.05mm, thereby preventing the plug 120 from being misaligned or falling off after assembly, which would affect subsequent welding.

[0043] Reference Figure 1 and Figure 2In some embodiments, in step S2, the positioning fixture 300 has two sets of clamps 310 and a stop block 320. The two sets of clamps 310 clamp the base plate 110 and abut the side edge of the base plate 110 away from the first edge portion 111 and the second edge portion 112 against the stop block 320. That is, the side edge of the base plate 110 away from the welding gun 200 abuts against the stop block 320. The clamps 310 are tightened by the knob on the clamps 310, thereby ensuring the stable clamping of the workpiece 100 and preventing the workpiece 100 from shifting during the welding process.

[0044] A second aspect of the present invention also provides an aluminum profile water channel plate, which is formed by welding the aluminum profile water channel plate of any of the above embodiments.

[0045] By using the welding method of aluminum profile water channel plate in any of the above embodiments to process aluminum profile water channel plate, during the welding process, different welding processes and parameters can be preset according to the different plate thicknesses and edge shapes of each area. Thus, by switching different welding processes for different plate thickness areas, the welding deformation of the product can be effectively reduced and the service life of the product can be extended.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A welding method for aluminum profile water channel plates, characterized in that, Includes the following steps: S1: Assemble and obtain a workpiece (100), the workpiece (100) includes a base plate (110) and a plug (120), the base plate (110) has a cavity (113) extending to the edge of the base plate (110), the edge of the base plate (110) includes a first edge portion (111) and a second edge portion (112) located on opposite sides of the cavity (113), the plug (120) is inserted between the first edge portion (111) and the second edge portion (112) and blocks the cavity (113). S2: Positioning, placing the assembled workpiece (100) into the positioning fixture (300), and clamping the base plate (110) with the clamp (310); S3: Partitioning, in the thickness direction of the workpiece (100), the edge of the workpiece (100) is divided into a first region (101), a second region (102) and a third region (103), the first region (101) at least partially covers the first edge portion (111), the second region (102) is located at the plug (120), and the third region (103) at least partially covers the second edge portion (112). S4: Welding, the welding torch (200) moves along the edge of the workpiece (100) and makes a periodic oscillating motion in the thickness direction of the workpiece (100), and the oscillation path (400) spans the first region (101), the second region (102) and the third region (103). CMT welding process is used in the first region (101) and the third region (103), and pulsed MIG welding process is used in the second region (102). The welding heat input of the first region (101) and the third region (103) is less than the welding heat input of the second region (102). In the length direction of the workpiece (100), the edge of the workpiece (100) has a first straight segment (130), a first arc segment (140), a second arc segment (150), and a second straight segment (160) connected in sequence. The first arc segment (140) is an outwardly convex arc, and the second arc segment (150) is an inwardly concave arc. During welding, the welding torch (200) passes through the first straight segment (130), the first arc segment (140), the second arc segment (150), and the second straight segment (160) in sequence. When the welding torch (200) passes through the first arc segment (140), the welding heat input is reduced; When the welding torch (200) passes through the second arc segment (150), the welding heat input is increased; When the welding torch (200) passes through the second straight segment (160), the welding heat input is reduced.

2. The welding method for aluminum profile water channel plates according to claim 1, characterized in that, In step S3, in the thickness direction of the workpiece (100), the first region (101) covers the first edge (111) and extends to cover the plug (120), and the second region (102) covers the second edge (112) and extends to cover the plug (120).

3. The welding method for aluminum profile water channel plates according to claim 2, characterized in that, In the thickness direction of the workpiece (100), the thickness of the first edge portion (111) and the second edge portion (112) is 1.5-3mm, the thickness of the plug (120) is 5-10mm, and the thickness of the first region (101) and the third region (103) is 2-4mm. In step S4, the welding torch (200) makes a periodic oscillating motion with a sinusoidal waveform in the thickness direction of the workpiece (100) with the center line of the plug (120) as the center. The oscillation frequency is 3.5-4.0HZ and the oscillation amplitude of the welding torch (200) is 3-8mm.

4. The welding method for aluminum profile waterway plate according to claim 3, characterized in that, In step S4, the welding heat input of the CMT welding process is 0.15-0.2 kJ / mm, and the welding heat input of the pulsed MIG welding process is 0.33-0.45 kJ / mm.

5. The welding method for aluminum profile waterway plate according to claim 4, characterized in that, In step S4, The welding current for CMT welding is 65-70A, the welding voltage is 12.3-12.8V, and the welding speed is 7-9mm / s. The peak current of the pulsed MIG welding process is 200A, the base current is 60A, the frequency is 80Hz, and the welding speed is 7-9mm / s.

6. The welding method for aluminum profile water channel plate according to claim 5, characterized in that, In step S4, when the welding torch (200) moves from the first straight segment (130) to the first arc segment (140), the welding heat input is reduced by increasing the wire feed speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed. When the welding torch (200) moves from the first arc segment (140) to the second arc segment (150), the welding heat input is increased by reducing the wire feed speed of the CMT welding process and / or increasing the pulse peak current and / or reducing the welding speed. When the welding torch (200) moves from the second arc segment (150) to the second straight segment (160), the welding heat input is reduced by increasing the wire feed speed of the CMT welding process and / or reducing the pulse peak current and / or increasing the welding speed.

7. The welding method for aluminum profile waterway plate according to claim 6, characterized in that, In step S4, When the welding torch (200) moves from the first straight section (130) to the first arc section (140), the wire feed speed of the CMT welding process is increased by 10%-30%, and / or the pulse peak current is increased by 40-80A, and / or the welding speed is increased by 15%-35%, so as to reduce the welding heat input by 15%-35%; When the welding torch (200) moves from the first arc segment (140) to the second arc segment (150), the wire feed speed of the CMT welding process is reduced by 10%-30%, and / or the pulse peak current is reduced by 40-80A, and / or the welding speed is reduced by 15%-35%, so as to increase the welding heat input by 15%-35%; When the welding torch (200) moves from the second arc segment (150) to the second straight segment (160), the wire feed speed of the CMT welding process is increased by 10%-30% and / or the pulse peak current is increased by 40-80A, and / or the welding speed is increased by 15%-35%, so as to reduce the welding heat input by 15%-35%.

8. The welding method for aluminum profile water channel plate according to claim 1, characterized in that, In step S4, the welding torch (200) is moved by the welding robot unit to perform welding; The welding robot unit includes: A six-axis industrial robot is used to drive a welding torch (200) to move along a preset trajectory; The welding power supply has two welding process modes: CMT and pulsed MIG, and can switch between the two welding process modes. A wire feeding mechanism for feeding welding wire to the welding torch (200); The central control unit, using a PLC or industrial computer, pre-stores all welding programs and can synchronously coordinate the movement of the six-axis industrial robot and the output of the welding power supply. A position sensing unit is installed at the tip of the welding torch (200). The position sensing unit is used to track the position of the tip of the welding torch (200) relative to the weld trajectory and feed the position information back to the central control unit. The central control unit can determine the position of the welding torch (200) based on the position information fed back by the position sensing unit and control the output of the welding power supply. When the tip of the welding torch (200) swings to the first region (101) or the third region (103), the central control unit controls the welding power supply to switch to CMT welding process mode; When the tip of the welding torch (200) swings to the second region (102), the central control unit controls the welding power supply to switch to pulsed MIG welding process mode.

9. The welding method for aluminum profile water channel plate according to claim 1, characterized in that, Step S1 includes: S1.1: Obtain the base plate (110) and the plug (120). The base plate (110) has a cavity (113) extending to the edge of the base plate (110). The edge of the base plate (110) includes a first edge portion (111) and a second edge portion (112) located on opposite sides of the cavity (113). S1.2: Wipe the surface of the base plate (110) with ethanol; S1.3: Use a stainless steel wire brush with a diameter of 0.15-0.2mm to polish the outer surfaces of the first edge portion (111), the second edge portion (112), and the plug (120); S1.4: Insert the plug (120) between the first edge portion (111) and the second edge portion (112) and seal the cavity (113). The plug (120) and the base plate (110) are interference-fitted with each other, and the interference amount is less than 0.05mm.

10. An aluminum profile water channel plate, characterized in that, It is formed by welding the aluminum profile waterway plate according to any one of claims 1-9.

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