Welding process for 1-series aluminum alloy cooling disc part

Abstract

The invention relates to the technical field of aluminum alloy part welding, in particular to a 1-series aluminum alloy cooling disc part welding process, a cooling disc part comprises a disc body and a cover plate, a lower limit groove is formed in the center of the disc body, a flow channel is formed in a sunken groove, the cover plate is assembled into the sunken groove, the edge of the disc body is machined into a longitudinal weld groove A, and the edge of the cover plate is machined into a longitudinal weld groove B; the longitudinal weld groove A and the longitudinal weld groove B form a butt joint groove structure; the to-be-welded planes and the butt joint groove structures of the disc body and the cover plate are connected in a vacuum brazing mode and a manual argon tungsten-arc welding mode respectively, and the surfaces of welded parts are seamless, sealed and free of leakage. The longitudinal fit clearance between the disc body and the cover plate is welded through the argon tungsten-arc welding method, the defect that longitudinal weld joints cannot be welded through vacuum brazing is overcome, surface forming is good after welding, the defects of air holes, holes and the like do not exist, and sealing performance is good; and argon tungsten-arc welding is good in operation flexibility and low in cost.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy parts welding technology, and in particular to a welding process for 1-series aluminum alloy cooling plate parts. Background Technology

[0002] Cooling pans are common components in semiconductor equipment, containing various flow channels that allow coolant to pass through, thus achieving cooling. Aluminum alloys possess excellent thermal conductivity and corrosion resistance, good stability, and good machinability and weldability, making them a commonly used material for manufacturing cooling pans. 1-series aluminum alloys, based on pure aluminum with an aluminum content of over 99%, offer better ductility and plasticity compared to conventional 6-series aluminum alloys, and also exhibit superior electrical and thermal conductivity and corrosion resistance, making them an increasingly widely used aluminum alloy material.

[0003] Aluminum alloy cooling disc parts are typically welded from two parts, with electron beam welding and vacuum brazing being the most common welding methods. For parts with simple flow channel characteristics and a cover plate contour consistent with the flow channel contour, electron beam welding can be used. However, for parts with complex flow channels requiring sealed welding at all internal flow channel intervals, electron beam welding results in significant deformation and is difficult to perform. Furthermore, when the part is thick, full penetration cannot be achieved, making electron beam welding unsuitable. In such cases, vacuum brazing can be used. Vacuum brazing involves pre-placing a filler metal with a lower melting temperature than the base material at the disc mating positions. The molten filler metal, after heating, wets and capillary-flows in the interface gaps, dissolving and diffusing with the base material to achieve welding at the contact surfaces. However, vacuum brazing has poor weldability for vertical longitudinal welds, and defects such as poor surface finish, voids, and poor sealing are prone to occur after welding. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention discloses a welding process for 1-series aluminum alloy cooling disc parts.

[0005] The specific technical solution is as follows: A welding process for a 1-series aluminum alloy cooling plate component, comprising a plate body and a cover plate, wherein the plate body is larger than the cover plate, the center of the plate body has a lower groove, the interior of the groove is a flow channel, the cover plate is assembled into the groove, the edge of the plate body is machined into a longitudinal weld bevel A, and the edge of the cover plate is machined into a longitudinal weld bevel B, the longitudinal weld bevel A and the longitudinal weld bevel B forming a butt joint bevel structure; the plate body and the cover plate are connected at the welding surfaces and the butt joint bevel structure by vacuum brazing and manual tungsten inert gas welding, respectively, resulting in a seamless and leak-free surface on the part after welding, specifically including the following steps: (1) Before assembly, the disc body and cover plate are chemically cleaned and dried to remove surface impurities; (2) During assembly, aluminum alloy brazing filler metal is first placed on the surface to be welded of the disc, and then the cover plate is assembled into the recessed groove. The bottom surface of the cover plate is in contact with the brazing filler metal, and the gap between the side of the cover plate and the side of the recessed groove is 0.2-0.3mm. The longitudinal weld groove A and the longitudinal weld groove B form a longitudinal butt weld groove. (3) The assembled parts are first vacuum brazed, clamped and fixed with tooling, and placed in a vacuum brazing furnace. The parts are heated for the first time and kept at that temperature for a period of time. The parts are then heated for the second time and kept at that temperature for a period of time before the heating is turned off. The parts are cooled in the furnace and taken out when the temperature of the parts reaches below 80°C to complete the vacuum brazing. (4) After vacuum brazing, a pressure test is performed to check the sealing performance of the vacuum brazing weld. The flow channel is filled with water and pressurized. During the pressure holding process, there is no leakage in the gap between the parts, indicating that the sealing performance of the brazing weld is qualified and the weld quality is good. (5) After the pressure test is completed, dry the parts and clean the surface of the longitudinal butt joint weld. Use manual tungsten inert gas welding with filler wire to fill the longitudinal butt joint weld to a height above the surface of the disc and cover plate, and complete the welding of the parts. (6) After the parts are welded, the surface weld excess is removed by machining to ensure good weld surface quality and no defects such as gaps, pores, or holes; (7) The parts were filled with water and pressure tested. During the pressure holding process, there was no leakage in the longitudinal butt joint bevel weld, indicating that the argon arc weld was qualified in terms of sealing and the weld quality was good.

[0006] In step (3), the vacuum brazing furnace is first heated to 350℃ and held for 2 hours; then it is heated to 550-560℃ and held for 30 minutes.

[0007] In step (5), the grade of the filler wire used for manual tungsten inert gas welding is 1100, the welding current is 250-300A, and argon gas is used for protection during welding.

[0008] The disc body and cover plate are both made of 1050 aluminum alloy.

[0009] Compared with the prior art, the present invention has the following beneficial technical effects: This invention uses vacuum brazing to weld the contact surface between the disc and the cover plate, achieving welding and sealing between the internal flow channel walls. It can simultaneously achieve planar welding and longitudinal weld welding between the disc and the cover plate. After the surface of the part is processed, the longitudinal fit gap is well welded, and there are no welding defects such as pores or holes, resulting in good product sealing.

[0010] This invention uses tungsten inert gas welding (TIG) to weld the longitudinal fit gap between the disc and the cover plate, which makes up for the inability of vacuum brazing to weld longitudinal welds. The surface after welding is well formed, without defects such as pores or holes, and has good sealing performance. Moreover, TIG welding has good operational flexibility and low cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the assembly of the disc body and cover plate of the present invention; Figure 2 This is a three-dimensional structural diagram of the disk body of the present invention; Figure 3 This is a three-dimensional structural diagram of the cover plate of the present invention; In the figure, 1 is the disc body; 11 is the recessed groove; 12 is the longitudinal weld bevel A; 13 is the flow channel; 14 is the surface to be welded; 2 is the cover plate; and 21 is the longitudinal weld bevel B. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the drawings.

[0013] Figure 1 This is a schematic diagram of the assembly of the disc body and cover plate of the present invention. Figure 2 This is a three-dimensional structural diagram of the disk body of the present invention. Figure 3 The figure shows a three-dimensional structural diagram of the cover plate of the present invention: This invention relates to a welding process for aluminum alloy cooling plate parts. The cooling plate parts include a plate body 1 and a cover plate 2 made of 1050 aluminum alloy. The outer dimensions of the plate body 1 are larger than those of the cover plate 2. The center of the plate body 1 is a lower limit groove 11, and the interior of the groove 11 is a flow channel 13. The cover plate 2 is assembled into the groove 11. The edge of the plate body 1 is machined into a longitudinal weld bevel A12, and the edge of the cover plate 2 is machined into a longitudinal weld bevel B21. The longitudinal weld bevels A12 and B21 form a butt joint bevel structure. The welding plane 14 of the plate body 1 and the cover plate 2 and the butt joint bevel structure are connected by vacuum brazing and manual tungsten inert gas welding, respectively. After welding, the surface of the parts is seamless and leak-free. The specific steps include the following: (1) Before assembly, the disc body 1 and the cover plate 2 are chemically cleaned and dried to remove surface impurities; (2) During assembly, aluminum alloy brazing filler metal is first placed on the welding plane 14 of the disc 1, and then the cover plate 2 is assembled into the recessed groove 11. The bottom surface of the cover plate 2 is in contact with the brazing filler metal, and the gap between the side of the cover plate 2 and the side of the recessed groove 11 is 0.2-0.3mm. The longitudinal weld groove A12 and the longitudinal weld groove B21 form a longitudinal butt weld groove. (3) The assembled parts are first vacuum brazed, clamped and fixed with tooling, and placed in a vacuum brazing furnace. The parts are heated to 350°C for the first time and kept at that temperature for 2 hours. The parts are then heated to 550-560°C for the second time and kept at that temperature for 30 minutes. The heating is then turned off and the parts are cooled in the furnace. When the part temperature reaches below 80°C, the parts are taken out to complete the vacuum brazing. (4) After vacuum brazing, a pressure test is performed to check the sealing performance of the vacuum brazing weld. The flow channel 13 is filled with water and pressurized. During the pressure holding process, there is no leakage in the gap between the parts, indicating that the sealing performance of the brazing weld is qualified and the weld quality is good. (5) After the pressure test is completed, dry the parts and clean the surface of the longitudinal butt joint weld. Use manual tungsten inert gas welding with filler wire to fill the longitudinal butt joint weld to a height higher than the surface of the disc 1 and the cover plate 2, and complete the welding of the parts. The grade of the filler wire used in the manual tungsten inert gas welding is 1100, the welding current is 250-300A, and argon gas is used for protection during welding. (6) After the parts are welded, the surface weld excess is removed by machining to ensure good weld surface quality and no defects such as gaps, pores, or holes; (7) The parts were filled with water and pressure tested. During the pressure holding process, there was no leakage in the longitudinal butt joint bevel weld, indicating that the argon arc weld was qualified in terms of sealing and the weld quality was good.

Claims

1. A welding process for 1-series aluminum alloy cooling disc parts, characterized in that: The cooling plate component includes a plate body (1) and a cover plate (2). The outer dimensions of the plate body (1) are larger than those of the cover plate (2). The center of the plate body (1) is a lower limit groove, and the interior of the recessed groove (11) is a flow channel (13). The cover plate (2) is assembled into the recessed groove (11). The edge of the plate body (1) is machined into a longitudinal weld bevel A (12), and the edge of the cover plate (2) is machined into a longitudinal weld bevel B (21). The longitudinal weld bevel A (12) and the longitudinal weld bevel B (21) constitute a butt joint bevel structure. The welding plane (14) of the plate body (1) and the butt joint bevel structure of the cover plate (2) are connected by vacuum brazing and manual tungsten inert gas welding, respectively. After welding, the surface of the part is seamless and sealed without leakage. The specific steps include the following: (1) Before assembly, the disc body (1) and the cover plate (2) are chemically cleaned and dried to remove surface impurities; (2) During assembly, aluminum alloy brazing filler metal is first placed on the welding plane (14) of the disc (1), and then the cover plate (2) is assembled into the recessed groove (11). The bottom surface of the cover plate (2) is in contact with the brazing filler metal, and the gap between the side of the cover plate (2) and the side of the recessed groove (11) is 0.2-0.3mm. The longitudinal weld groove A (12) and the longitudinal weld groove B (21) form a longitudinal butt weld. (3) The assembled parts are first vacuum brazed, clamped and fixed with tooling, and placed in a vacuum brazing furnace. The parts are heated for the first time and kept at that temperature for a period of time. The parts are then heated for the second time and kept at that temperature for a period of time before the heating is turned off. The parts are cooled in the furnace and taken out when the temperature of the parts reaches below 80°C to complete the vacuum brazing. (4) After vacuum brazing, a pressure test is performed to check the sealing performance of the vacuum brazing weld. The flow channel (13) is filled with water and pressurized. During the pressure holding process, there is no leakage in the gap between the parts, indicating that the sealing performance of the brazing weld is qualified and the weld quality is good. (5) After the pressure test is completed, dry the parts and clean the surface of the longitudinal butt joint weld. Use manual tungsten inert gas welding with filler wire to fill the longitudinal butt joint weld to a height higher than the surface of the disc (1) and cover plate (2) to complete the welding of the parts. (6) After the parts are welded, the surface weld excess is removed by machining to ensure good weld surface quality and no defects such as gaps, pores, or holes; (7) The parts were filled with water and pressure tested. During the pressure holding process, there was no leakage in the longitudinal butt joint bevel weld, indicating that the argon arc weld was qualified in terms of sealing and the weld quality was good.

2. The welding process for 1-series aluminum alloy cooling disc parts according to claim 1, characterized in that: In step (3), the vacuum brazing furnace is first heated to 350℃ and held for 2 hours; then it is heated to 550-560℃ and held for 30 minutes.

3. The welding process for 1-series aluminum alloy cooling disc parts according to claim 1, characterized in that: In step (5), the grade of the filler wire used for manual tungsten inert gas welding is 1100, the welding current is 250-300A, and argon gas is used for protection during welding.

4. The welding process for 1-series aluminum alloy cooling disc parts according to claim 1, characterized in that: The disc body (1) and cover plate (2) are both made of 1050 aluminum alloy.

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