CN117139922A - Manufacturing method of brazing composite board - Google Patents
Manufacturing method of brazing composite board Download PDFInfo
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- CN117139922A CN117139922A CN202210568459.6A CN202210568459A CN117139922A CN 117139922 A CN117139922 A CN 117139922A CN 202210568459 A CN202210568459 A CN 202210568459A CN 117139922 A CN117139922 A CN 117139922A
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- brazing
- alloy
- composite plate
- casting
- flux
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- 238000005219 brazing Methods 0.000 title claims abstract description 105
- 239000002131 composite material Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 229910018125 Al-Si Inorganic materials 0.000 claims abstract description 3
- 229910018520 Al—Si Inorganic materials 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000956 alloy Substances 0.000 abstract description 25
- 238000000034 method Methods 0.000 abstract description 21
- 229910045601 alloy Inorganic materials 0.000 abstract description 19
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 12
- 230000004907 flux Effects 0.000 description 31
- 239000000463 material Substances 0.000 description 30
- 239000011162 core material Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000523 sample Substances 0.000 description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- RXCBCUJUGULOGC-UHFFFAOYSA-H dipotassium;tetrafluorotitanium;difluoride Chemical compound [F-].[F-].[F-].[F-].[F-].[F-].[K+].[K+].[Ti+4] RXCBCUJUGULOGC-UHFFFAOYSA-H 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a method for manufacturing a brazing composite plate, which can form a fillet with excellent fatigue strength by brazing with an aluminum alloy containing Mg. The manufacturing method comprises the following steps: a casting step of adding a Si raw material to an aluminum liquid and casting an Al-Si-based brazing filler metal ingot containing 7 to 12 mass% of Si; and a rolling step of rolling the brazing composite plate containing the brazing alloy ingot so that the plate thickness is 0.8-3 mm, wherein the brazing alloy in the brazing composite plate has a thickness ratio of 3-12%, and the Si raw material does not contain a fluxing agent.
Description
Technical Field
The invention provides a method for manufacturing a brazing composite plate capable of being brazed with an aluminum alloy containing Mg.
Background
Aluminum alloy heat exchangers typified by automotive heat exchangers are often manufactured from a composite material formed by coating a core material with a brazing material.
The most commonly used brazing method in recent years is the CAB method (Controlled Atmosphere Brazing: shielding gas brazing method). The CAB method is a method of heating an aluminum material in a non-oxidizing atmosphere such as nitrogen, and performing braze welding by breaking an oxide film on the surface of the aluminum material with a molten non-corrosive brazing flux.
As a support material for fixing a heat exchanger Tank (Tank) material, a 6-series alloy to which Mg is added, which can improve vibration fatigue resistance, is used. Mg contained in the material is oxidized during brazing, and a strong oxide film is formed, so that brazing is suppressed. In CAB method, a fluoride-based flux (hereinafter referred to as flux) is generally used, but the flux reacts with Mg contained in the material, and thus the flux cannot function to sufficiently break the oxide film, and thus a fillet of a normal shape may not be formed.
In particular, in the case where the weld fillet shape is abnormal in the joint portion where strength is required and fatigue fracture is likely to occur due to vibration, stress is likely to concentrate in the weld fillet portion and fatigue fracture occurs. In this case, even if the strength of the material is improved by using an aluminum alloy to which Mg is added, good fatigue strength cannot be obtained.
Disclosure of Invention
Problems to be solved by the invention
The invention provides a method for manufacturing a brazing composite plate, which can form a fillet with excellent fatigue strength by brazing with an aluminum alloy containing Mg.
Solution for solving the problem
According to an embodiment of the present invention, the following solution is provided.
The invention provides a method for manufacturing a brazing composite plate, which is characterized by comprising the following steps: a casting step of casting an Al-Si-based brazing filler metal ingot containing 7 to 12 mass% of Si by mixing a Si raw material with a molten aluminum liquid; and a rolling step of rolling the brazing composite plate containing the brazing alloy ingot so that the plate thickness is 0.8-3 mm, wherein the brazing alloy in the brazing composite plate has a thickness ratio of 3-12%, and the Si raw material does not contain a fluxing agent.
Effects of the invention
Compared with the prior art, the invention has the beneficial effects that: according to the embodiments of the present invention, it is possible to prevent a flux that hinders the exertion of a fluoride system at the time of brazing heating from being mixed into a brazing material together with a Si raw material at the time of casting, and to form a fillet of a normal shape in joining with an Mg-containing aluminum alloy. The invention provides a method for manufacturing a brazing composite plate, which can form a fillet with excellent fatigue strength by brazing with an aluminum alloy containing Mg.
Drawings
Fig. 1 is a flow chart of the production of an aluminum alloy composite panel.
Fig. 2 (a) is a schematic view of a sample material viewed from the vertical direction, and fig. 2 (b) is a photograph of the sample material taken from the vertical direction.
Fig. 3 (a) and 3 (b) are photographs of sample materials taken from a vertical direction, fig. 3 (c) and 3 (d) are photographs of sample materials taken from an oblique direction, and fig. 3 (e) and 3 (f) of fig. 3 are photographs of cross sections showing a fillet.
Detailed Description
The invention is further described below in connection with the following detailed description.
The raw materials in examples and comparative examples are commercially available.
Unless specifically stated otherwise, materials, methods and apparatus employed in the present invention are those conventional in the art.
1. Construction of brazed composite plate
The brazing sheet manufactured by the manufacturing method according to the embodiment of the invention is a brazing composite sheet having a total sheet thickness of 0.8 to 3.0mm, and has a core material and at least one layer of brazing filler metal. The coating rate of the brazing layer is 3-12% (thickness ratio). The cladding ratio is the ratio of the thickness of the brazing material to the total thickness of the composite plate. The brazing layer may be compounded on only one surface of the core material, or may be compounded on both surfaces of the core material. When brazing layers are present on both surfaces of the core material, the cladding ratio represents the thickness ratio of the individual brazing layers.
The core material may be an al—mn alloy typified by 3003 alloy, or may be an alloy in which strength is improved by adding 0.05 to 1.2 mass% of Cu or 0.05 to 0.3 mass% of Mg to the al—mn alloy. The core material may contain 0.3 mass% or less of Cr, zr, ti, or 1.0 mass% or less of Zn, ni. The contents of Cr, zr, ti, zn and Ni within the above-described content ranges do not affect the effects of the present invention. The core material may contain impurity elements other than the above elements within a range that does not affect the effect of the present invention, and specifically may contain impurity elements within a range that is 0.05 mass% or less each and 0.15 mass% or less total.
The brazing material used in the present invention may be an al—si-based alloy used in CAB method, and an alloy such as 4343, 4045, and 4047 may be applied as the brazing material.
As described above, the coating ratio of the brazing layer is 3 to 12% (thickness percentage). When the coating ratio of the brazing layer is less than 3%, the manufacturing of the composite board becomes difficult. On the other hand, in the brazing composite plate manufactured by the present invention, if the brazing filler metal is thickened to a coating ratio exceeding 12%, an excessive amount of molten brazing filler metal is generated during brazing, and the molten brazing filler metal flows along members such as pipes, resulting in a problem that the base metal is melted.
When the brazing material is present on only one surface of the core material, an alloy represented by the 1050 alloy or an al—zn alloy represented by the 7072 alloy may be clad on the surface on the opposite side from the brazing material. Further, an alloy material containing 1 or 2 or more of 0.5 to 5 mass% Zn, 0.05 to 2.5 mass% Mg, and 0.05 to 1.2 mass% Mn may be coated on the surface opposite to the brazing layer. The sacrificial corrosion resistance can be improved by coating the Zn-containing alloy material, and the strength can be improved by coating the Mg-and Mn-containing alloy material.
Since the lower limit of the thickness of the brazing composite plate of this example is 0.8mm, which is sufficiently thick, it can be considered that: the alloy material clad on the surface on the opposite side does not affect the shape of the fillet formed by brazing. Therefore, the alloy that can be coated on the surface opposite to the brazing material is not limited, and various characteristics of the composite plate can be improved by coating various alloy materials.
When the plate thickness of the brazing composite plate is 0.8mm or more, fatigue failure of the fillet may occur before the composite plate itself is fatigue-broken. Therefore, by applying the present invention in the production of a brazing sheet having a sheet thickness of 0.8mm or more, the fatigue strength at the fillet can be improved, and the fatigue resistance of a product to which the brazing composite sheet is applied can be improved. On the other hand, when the thickness of the brazing sheet is 3mm or less, it is difficult to suppress fatigue fracture of the fillet due to deformation in the vicinity of the fillet due to the mechanical properties of the brazing composite sheet itself. Therefore, by applying the invention when manufacturing the brazing composite plate with the thickness of less than 3mm, the fatigue strength of the welding angle is improved, and the fatigue resistance of the product using the brazing composite plate is improved.
2. Method for manufacturing brazing composite plate
Fig. 1 is a schematic view of the production flow of the brazing composite plate according to this embodiment.
First, in the casting step, an ingot of an al—si based brazing filler metal containing 7 to 12 mass% of Si is cast by adding a Si raw material and mixing with a molten aluminum. Specifically, a brazing filler metal ingot of the brazing composite plate is cast by a DC method (rapid cooling casting). The surface of the composite board is made of leather. The same casting method as the core material is used for the cast ingots of other skins except the brazing filler metal. And then, milling the surface of the leather ingot. While milling the surface of the skin ingot, one or both of the head and tail of the ingot may be sawed. In addition, the skin ingot may be subjected to homogenization (soaking) as needed.
Similarly, an ingot of the core material is manufactured by DC casting. Next, the ingot of the core material is homogenized. In general, a core ingot is subjected to homogenization treatment in order to improve the formability of the material. In addition, it is necessary to mill the ingot of the core material, and one or both of the head and tail portions may be sawn as required.
Then, in the rolling step, the composite sheet containing the brazing filler metal is rolled so that the thickness of the composite sheet is 0.8 to 3mm, and the ratio of the thickness of the brazing filler metal layer in the brazing composite sheet is 3 to 12%. The rolling process comprises the following steps: a skin rolling step of forming a skin rolled sheet by hot rolling; a welding step of forming a composite material by welding an ingot of the sheath material and the core material in a thickness direction; a hot rolling compounding step of forming a composite plate by compounding and rolling; and a cold rolling step of rolling the brazing composite sheet to a final sheet thickness.
In the skin rolling step, the thickness of the skin can be brought to a target plate thickness by hot rolling. When a plurality of skins are required as the clad layer, casting and rolling processes of the skins can be performed for each skin.
In the bonding process, a bonding material is formed by bonding the sawn core ingot and sheath in the thickness direction, and the core ingot and sheath are fixed by beating a steel strip or welding. When the core ingot and the skin are welded, the core ingot and the skin may be subjected to a surface treatment, such as a brushing or chemical treatment.
In the composite rolling process, the skin material and the core material of the material are bonded together by composite rolling the material. And obtaining the composite coiled material through hot rolling and coiling pass.
In the cold rolling step, the composite coil is cold rolled to form a material having a final sheet thickness. Annealing is performed during or after cold rolling to give the brazing composite sheet the desired material state of H24, H14, O, etc. The purpose is to satisfy the material formability and to suppress the diffusion of the brazing filler metal into the core material during brazing. After the annealing conditions are determined, the annealing may be performed according to a conventional method.
Hereinafter, a casting process of the brazing sheet ingot will be described in detail. In the casting process of this example, an aluminum-based metal and a Si raw material were mixed, melted in a melting furnace, and the composition was adjusted in a holding furnace, followed by DC casting.
By using Si raw material without flux during casting, a fillet having a normal shape can be formed when the composite material is brazed with an Mg-containing aluminum alloy.
When a molten Al-Si alloy is formed during casting, a Si raw material having a high melting point is added to the molten aluminum liquid. At this time, al reacts with Si to form an al—si eutectic composition, which lowers the melting point and forms a molten metal bath of an al—si alloy. Conventionally, in order to promote melting of Si raw materials, a flux is added to the Si raw materials.
The flux used to promote melting of the Si raw material at the time of casting (hereinafter referred to as casting flux) is usually a fluotitanic acid flux, and is different from a fluoride flux used at the time of composing brazing. The casting flux remaining in the brazing filler metal suppresses the action of the flux during brazing heating, and thus causes unstable formation of fillet, and in particular, in joining with an Mg-containing aluminum alloy, it has been found that the use of Si raw material to which no casting flux is added can normally form fillet on the Mg-containing aluminum alloy.
In this case, the absence of the flux in the Si raw material means that the casting flux is not mixed into the molten aluminum liquid with the mixing of the Si raw material. That is, the casting flux is not contained in the Si raw material, and the casting flux does not adhere to the surface of the Si raw material.
In the case of the brazing composite sheet produced by the production method, brazing can be performed by a so-called CAB method using a fluoride-based non-corrosive brazing flux in a non-oxidizing atmosphere. With respect to the brazing composite plate manufactured by this manufacturing method, even in the CAB method using the fluoride-based flux, a fillet of a normal shape can be formed.
AA6101 alloy or AA6063 alloy are typical alloy materials for use with the brazing composite sheet produced by this method of manufacture. However, the material to be used for the brazing composite plate is not limited to the AA6101 alloy or the AA6063 alloy, as long as it is an aluminum alloy containing 0.1 to 3 mass% Mg. The brazing composite sheet produced by the production method of this example can also be brazed with a mating material having an Mg content of less than 0.1 mass%.
3. Examples
[ Table 1 ]
Among these, si raw materials containing a flux were used in comparative examples, and Si raw materials containing no flux were used in examples.
A brazing composite plate having a two-layer structure composed of a brazing filler metal and a core material having chemical compositions shown in table 1 was industrially produced. As shown in table 1, the composite plates in the examples and comparative examples have almost the same chemical composition. The brazing composite plates of the examples and the comparative examples each had a plate thickness of 1.25mm and were O-state in quality.
The brazing layer as a comparative example is different from the brazing layer as an example in that a Si raw material containing only 4 mass% of a casting flux was used in the casting process. Specifically, the Si raw material used in the comparative example contains potassium hexafluorotitanate as a main component, and also contains sodium hexafluorotitanate, potassium chloride, and sodium chloride as casting fluxes. On the other hand, the Si raw material used in the example contains about 0.3 mass% of Fe or the like as an impurity, but does not contain a casting flux.
The brazing layer of the embodiment is manufactured by the manufacturing method described above. The brazing layer of the comparative example was produced by the same production method as in the example, except that a Si raw material containing a casting flux was used in the casting process.
The brazing composite sheets of examples and comparative examples were used for evaluation of brazability. Fig. 2 (a) and 2 (b) are schematic diagrams and photographs of the evaluation method of weldability. As shown in fig. 2 (a), the brazing composite sheet specimen was cut into pieces 20mm wide and 50mm long. Then, a flux of potassium fluoroaluminate type, so-called Nocolox flux, was used as a flux at a rate of 5g/m 2 Spraying on the surface of the solder. Then, an AA6101 alloy (Al-0.45 Si-0.35Fe-0.55Mg alloy) having a thickness of 4mm, a width of 14mm, and a length of 20mm was placed at the center on the solder surface of the sample material coated with the flux.
Next, brazing was performed by CAB method in the following manner. The brazing heating was performed in nitrogen gas, and the fillet shape of the sample after the brazing heating was evaluated. The brazing heating is heating performed in a furnace after the sample material reaches 600 ℃.
Fig. 3 (a), 3 (c) and 3 (e) are photographs of the fillet shape of the example, and fig. 3 (b), 3 (d) and 3 (f) are photographs of the fillet shape of the comparative example. As shown in fig. 3 (b), 3 (d) and 3 (f), there are portions where a sufficient fillet is not formed in the brazing composite plate of the comparative example. Accordingly, the fatigue strength of the brazing composite plate in the comparative example was lowered. On the other hand, as shown in fig. 3 (a), 3 (c) and 3 (e), the brazing composite plate of the embodiment forms a fillet at any portion and forms a very uniform fillet shape over the entire circumference. Therefore, stress is not concentrated on a part of the fillet, and the possibility of fatigue fracture is small.
Claims (1)
1. A method of making a brazed composite plate comprising:
a casting step of casting an Al-Si-based brazing filler metal ingot containing 7 to 12 mass% of Si by mixing a Si raw material with a molten aluminum liquid; and
a rolling step of rolling a brazing composite plate containing the brazing filler metal ingot so that the thickness of the brazing composite plate is 0.8 to 3mm, wherein the brazing filler metal in the brazing composite plate has a thickness ratio of 3 to 12%,
the Si feedstock is free of fluxing agents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210568459.6A CN117139922A (en) | 2022-05-23 | 2022-05-23 | Manufacturing method of brazing composite board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210568459.6A CN117139922A (en) | 2022-05-23 | 2022-05-23 | Manufacturing method of brazing composite board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117139922A true CN117139922A (en) | 2023-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210568459.6A Pending CN117139922A (en) | 2022-05-23 | 2022-05-23 | Manufacturing method of brazing composite board |
Country Status (1)
| Country | Link |
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| CN (1) | CN117139922A (en) |
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2022
- 2022-05-23 CN CN202210568459.6A patent/CN117139922A/en active Pending
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