Process for manufacturing aluminum alloy door and window and application thereof

Abstract

The application discloses an aluminum alloy door and window process and application thereof, and relates to the technical field of aluminum alloy door and window manufacturing, in particular to an aluminum alloy door and window process and application thereof. The aluminum alloy door and window process comprises the following steps: (1) aluminum alloy base material pretreatment; (2) welding; and (3) post-treatment. The aluminum alloy is 6063-T5 aluminum alloy, the pretreatment comprises sand blasting treatment, cutting and burr removal. The obtained welding position is free of oxidation on the back, free of cracks on the surface, free of cavities inside, and the tensile strength of the welding joint is up to 320 MPa. The process is simple and easy to operate, and the prepared aluminum alloy door and window has excellent water seepage prevention effect and high aesthetic degree.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy doors and windows technology, classified under B23K9 / 16, specifically to a process for aluminum alloy doors and windows and its application. Background Technology

[0002] Aluminum alloys have low density, high strength, and good plasticity, making them suitable for processing into various profiles. They also possess excellent electrical and thermal conductivity and corrosion resistance, making them a common material for doors and windows. Currently, all aluminum alloy doors and windows require welding during manufacturing. Commonly used welding methods include laser welding, electron beam welding, friction stir welding (FSW), TIG welding, and MIG welding. However, in actual production, weak welds on aluminum alloy doors and windows can easily lead to water leakage, affecting product sales.

[0003] 6063-T5 aluminum alloy has good corrosion resistance, moderate strength, and good corrosion resistance, and is widely used in building aluminum doors and windows. However, when used as a material for aluminum alloy doors and windows, hot cracks, pores, or blackening often occur during welding, which reduces the aesthetics and tensile strength of the doors and windows.

[0004] Chinese patent CN110984788A discloses an environmentally friendly aluminum alloy door and window with high-efficiency waterproof performance. It achieves the effect of high-efficiency waterproof performance by changing the structure of aluminum alloy door and window, but its manufacturing process is complicated and difficult to mass-produce.

[0005] Chinese patent CN103381518A discloses a welding process for aluminum alloy doors and windows. By adopting a welding corner assembly method, it solves the problems of gaps in the profile cavity and strength at the corner joints. However, it does not solve the problems of aesthetics and reduced tensile strength of 6063-T5 aluminum alloy during welding. Summary of the Invention

[0006] To solve the above problems, the first aspect of the present invention provides a process for aluminum alloy doors and windows, including the following steps: (1) pretreatment of aluminum alloy substrate; (2) welding; (3) posttreatment, wherein the aluminum alloy is 6063-T5 aluminum alloy, and the pretreatment includes sandblasting, cutting and deburring.

[0007] Further preferably, the process of the aluminum alloy doors and windows includes the following steps: (1) After sandblasting and cutting the surface of the aluminum alloy substrate, the cut of the aluminum alloy substrate is ground to remove burrs, thus obtaining the pre-treated aluminum alloy substrate. (2) The pre-treated aluminum alloy substrate is spliced ​​at the corners using pin corner brackets, and then the corners are welded using a welding machine. (3) After welding, the weld scars are milled using a weld bead milling machine, and then the corners are ground smooth using a CNC grinding machine, and then the whole part is sprayed.

[0008] More preferably, in step (2), the welding start and end positions are 2-3mm away from the corner end, the weld reinforcement after welding is 1-3mm, and the welding method is MIG welding.

[0009] Preferably, the thickness of the 6063-T5 aluminum alloy substrate is 1.4-2.0 mm.

[0010] Preferably, the welding method in step (2) is direct welding.

[0011] Preferably, the welding wire used in the welding is aluminum-magnesium welding wire.

[0012] More preferably, the aluminum-magnesium welding wire is ER5356.

[0013] Preferably, the elements in the aluminum-magnesium welding wire include Mg, Mn, Cr, Ti, and Al.

[0014] Using ER5356 aluminum-magnesium welding wire, along with appropriate content of each element, results in smaller precipitate points in the weld metal. The more evenly the material is dispersed at the grain boundaries, the better the tensile strength of the weld joint. Using other types of welding wire will cause indentations in the 6063-T5 aluminum alloy, leading to a significant reduction in the tensile strength of the weld joint.

[0015] Preferably, the welding wire angle is 45-60° during welding.

[0016] More preferably, the welding wire angle is 45-55° during welding.

[0017] More preferably, the welding wire angle is 50° during welding.

[0018] Preferably, the welding current during welding is 60-120 amperes, the welding voltage is 10-15 volts, and the welding speed is 5-8 m / min.

[0019] More preferably, the welding current is 80-100 amperes, the welding voltage is 11-14 volts, and the welding speed is 5-7 m / min.

[0020] More preferably, the welding current is 90 amperes, the welding voltage is 12 volts, and the welding speed is 6 m / min.

[0021] If the welding speed is too fast, the arc will not have enough time to melt the welding rod and base metal, resulting in a weld cross-section that is too small and prone to defects such as incomplete penetration. If the welding speed is too slow, the high-temperature dwell time will increase, the heat-affected zone will increase, the grains of the weld joint will become coarser, the tensile strength will decrease, and the deformation will increase. The welding speed is limited to 5-8 m / min, which ensures the tensile strength and improves the product qualification rate.

[0022] Preferably, the protective gas used during welding is argon, and the argon gas flow rate is 14-22 L / min.

[0023] More preferably, the protective gas used during welding is argon, and the argon gas flow rate is 15-20 L / min.

[0024] More preferably, the protective gas used during welding is argon, and the argon gas flow rate is 18 L / min.

[0025] If the argon flow rate is too low and the gas flow stiffness is insufficient, the protection effect will be poor, which will make the back of the weld seam prone to oxidation, porosity, scorching and other phenomena. At the same time, the tensile strength will also be reduced accordingly. On the other hand, if the argon flow rate is too high, eddies will easily be generated during welding, which will also affect the argon protection effect. When the argon flow rate is limited to 15-20L / min, not only will the appearance be better, but the tensile strength will also be increased accordingly.

[0026] Preferably, after the welding is completed, it needs to be cooled for 10-25 minutes before post-processing.

[0027] More preferably, after the welding is completed, it needs to be cooled for 10-20 minutes before post-processing.

[0028] More preferably, after the welding is completed, it needs to be cooled for 15 minutes before post-processing.

[0029] The second aspect of this invention provides a process for aluminum alloy doors and windows, and its application in aluminum alloy doors and windows.

[0030] Beneficial effects:

[0031] (1) By adjusting specific welding parameters and welding wire type, and selecting specific processes, the present invention achieves a welding position with no oxidation on the back, no cracks on the surface, and no pores inside, and the tensile strength of the welded joint is as high as 320MPa. It is suitable for 6063-T5 aluminum alloy substrates with a thickness of 1.4-2.0mm.

[0032] (2) The process of the present invention is simple and easy to operate. The aluminum alloy doors and windows prepared by the process of the present invention have excellent water-proof effect, high aesthetic appeal, and good practical value. Detailed Implementation

[0033] Example 1

[0034] A process for manufacturing aluminum alloy doors and windows includes the following steps: (1) After sandblasting and cutting the surface of the aluminum alloy substrate, the cut edges of the aluminum alloy substrate are ground to remove burrs, thus obtaining the pre-treated aluminum alloy substrate. (2) The pre-treated aluminum alloy substrate is spliced ​​at the corners using pin corner brackets, and then the corners are welded using a welding machine. (3) After welding, the weld scars are milled using a weld bead milling machine, and then the corners are ground smooth using a CNC grinding machine before overall spraying.

[0035] The aluminum alloy is 6063-T5 aluminum alloy with a thickness of 1.4-2.0mm, purchased from Jiangsu Baige Nonferrous Metals Materials Co., Ltd.

[0036] In step (2), the welding method is direct welding and the welding technique is MIG welding.

[0037] The welding wire used in the welding is aluminum-magnesium welding wire. The elements in the aluminum-magnesium welding wire, by mass percentage, include Mg 4.5-5.5%, Mn 0.02-0.05%, Cr 0.05-0.20%, Ti 0.06-0.20%, with the balance being aluminum. It was purchased from Qinghe County Beizheng Welding Materials Co., Ltd., and the model is ER5356.

[0038] The welding wire angle is 50° during the welding process.

[0039] In step (2), the welding start and end positions are 2mm away from the corner end, and the weld reinforcement after welding is 2mm.

[0040] The welding current is 90 amperes, the welding voltage is 12 volts, and the welding speed is 6 m / min.

[0041] The protective gas used during welding is argon, and the argon gas flow rate is 18 L / min.

[0042] After the welding is completed, it needs to be cooled for 15 minutes before post-processing.

[0043] The second aspect of this invention provides a process for aluminum alloy doors and windows, and its application in aluminum alloy doors and windows.

[0044] The welding position obtained by the welding process of Example 1 has no oxidation on the back side, no cracks on the surface, and no pores inside.

[0045] Example 2

[0046] A process for manufacturing aluminum alloy doors and windows includes the following steps: (1) After sandblasting and cutting the surface of the aluminum alloy substrate, the cut edges of the aluminum alloy substrate are ground to remove burrs, thus obtaining the pre-treated aluminum alloy substrate. (2) The pre-treated aluminum alloy substrate is spliced ​​at the corners using pin corner brackets, and then the corners are welded using a welding machine. (3) After welding, the weld scars are milled using a weld bead milling machine, and then the corners are ground smooth using a CNC grinding machine before overall spraying.

[0047] The aluminum alloy is 6063-T5 aluminum alloy with a thickness of 1.4-2.0mm, purchased from Jiangsu Baige Nonferrous Metals Materials Co., Ltd.

[0048] In step (2), the welding method is direct welding and the welding technique is MIG welding.

[0049] The welding wire used in the welding is aluminum-magnesium welding wire. The elements in the aluminum-magnesium welding wire, by mass percentage, include Mg 4.5-5.5%, Mn 0.02-0.05%, Cr 0.05-0.20%, Ti 0.06-0.20%, with the balance being aluminum. It was purchased from Qinghe County Beizheng Welding Materials Co., Ltd., and the model is ER5356.

[0050] The welding wire angle is 50° during the welding process.

[0051] In step (2), the welding start and end positions are 2mm away from the corner end, and the weld reinforcement after welding is 2mm.

[0052] The welding current is 100 amperes, the welding voltage is 15 volts, and the welding speed is 7 m / min.

[0053] The protective gas used during welding is argon, and the argon gas flow rate is 20 L / min.

[0054] After the welding is completed, it needs to be cooled for 15 minutes before post-processing.

[0055] The second aspect of this invention provides a process for aluminum alloy doors and windows, and its application in aluminum alloy doors and windows.

[0056] The welding position obtained by the welding process in Example 2 has no oxidation on the back side, no cracks on the surface, and no pores inside.

[0057] Example 3

[0058] A process for manufacturing aluminum alloy doors and windows includes the following steps: (1) After sandblasting and cutting the surface of the aluminum alloy substrate, the cut edges of the aluminum alloy substrate are ground to remove burrs, thus obtaining the pre-treated aluminum alloy substrate. (2) The pre-treated aluminum alloy substrate is spliced ​​at the corners using pin corner brackets, and then the corners are welded using a welding machine. (3) After welding, the weld scars are milled using a weld bead milling machine, and then the corners are ground smooth using a CNC grinding machine before overall spraying.

[0059] The aluminum alloy is 6063-T5 aluminum alloy with a thickness of 1.4-2.0mm, purchased from Jiangsu Baige Nonferrous Metals Materials Co., Ltd.

[0060] In step (2), the welding method is direct welding and the welding technique is MIG welding.

[0061] The welding wire used in the welding is aluminum-magnesium welding wire. The elements in the aluminum-magnesium welding wire, by mass percentage, include Mg 4.5-5.5%, Mn 0.02-0.05%, Cr 0.05-0.20%, Ti 0.06-0.20%, with the balance being aluminum. It was purchased from Qinghe County Beizheng Welding Materials Co., Ltd., and the model is ER5356.

[0062] The welding wire angle is 50° during the welding process.

[0063] In step (2), the welding start and end positions are 2mm away from the corner end, and the weld reinforcement after welding is 2mm.

[0064] The welding current is 80 amperes, the welding voltage is 10 volts, and the welding speed is 5 m / min.

[0065] The protective gas used during welding is argon, and the argon gas flow rate is 15 L / min.

[0066] After the welding is completed, it needs to be cooled for 15 minutes before post-processing.

[0067] The second aspect of this invention provides a process for aluminum alloy doors and windows, and its application in aluminum alloy doors and windows.

[0068] The welding position obtained by the welding process in Example 3 has no oxidation on the back side, no cracks on the surface, and no pores inside.

[0069] Comparative Example 1

[0070] The welding current was changed to 60 amperes, the welding voltage to 9 volts, and the welding speed to 4 m / min, with the rest remaining the same as in Example 1.

[0071] Comparative Example 2

[0072] The argon gas flow rate was changed to 13 L / min, and the rest was the same as in Example 1.

[0073] Comparative Example 3

[0074] The argon gas flow rate was changed to 25 L / min, and the rest was the same as in Example 1.

[0075] Comparative Example 4

[0076] The welding wire used in the welding was changed to aluminum-magnesium welding wire. The elements in the aluminum-magnesium welding wire, by mass percentage, include Mg 4.3-5.2%, Mn 0.05-1.0%, Cr 0.05-0.25%, Ti≤0.15%, and the balance is aluminum. It was purchased from Qinghe County Beizheng Welding Materials Co., Ltd., and the model is ER5183.

[0077] Performance Evaluation

[0078] (1) Tensile strength test: The tensile strength of the welded joint was tested according to the test standard GB / T2651-2008. The test results are shown in Table 1 below.

[0079] Table 1

[0080] Example Tensile strength (MPa) Example 1 320 Example 2 318 Example 3 317 Comparative Example 1 300 Comparative Example 2 303 Comparative Example 3 310 Comparative Example 4 298

[0081] Compared with Example 1, the slower welding speed in Comparative Example 1 leads to coarser grains in the weld joint and reduced tensile strength. The slower argon gas flow rate in Comparative Example 2 makes the back side of the weld prone to oxidation, resulting in porosity and a corresponding decrease in tensile strength. The faster argon gas flow rate in Comparative Example 3 also affects its tensile strength. In Comparative Example 4, the aluminum-magnesium welding wire was changed to ER5183. Due to the significant change in the internal element content of the welding wire, the tensile strength of the weld joint was significantly reduced.

Claims

1. A process for manufacturing aluminum alloy doors and windows, characterized in that, Includes the following steps: (1) After sandblasting and cutting the surface of the aluminum alloy substrate, grind the cut of the aluminum alloy substrate to remove burrs, and thus obtain the pre-treated aluminum alloy substrate. (2) After the pre-treated aluminum alloy substrate is spliced ​​at the corners using pin corner brackets, the corners are then welded using a welding machine; (3) After welding, use a weld milling machine to clean the weld scars, then use a CNC grinder to grind the corners flat, and then spray the whole thing. The aluminum alloy is 6063-T5 aluminum alloy; The thickness of the 6063-T5 aluminum alloy substrate is 1.4-2.0 mm; In step (2), the welding method is direct welding, and the welding wire used in the welding is aluminum-magnesium welding wire. The elements in aluminum-magnesium welding wire include Mg, Mn, Cr, Ti and Al. The angle of the welding wire during welding is 45-60°. The welding current during the welding process is 60-120 amperes, the welding voltage is 10-15 volts, and the welding speed is 5-8 m / min; The protective gas used during welding is argon, and the argon gas flow rate is 14-22 L / min.

2. The process for manufacturing aluminum alloy doors and windows according to claim 1, characterized in that, After welding, the material needs to cool for 10-25 minutes before post-processing.

3. The application of the aluminum alloy door and window process according to claim 1 to aluminum alloy doors and windows.