CN113909734A - High-conductivity flux-cored soldering sheet - Google Patents
High-conductivity flux-cored soldering sheet Download PDFInfo
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- CN113909734A CN113909734A CN202111333591.0A CN202111333591A CN113909734A CN 113909734 A CN113909734 A CN 113909734A CN 202111333591 A CN202111333591 A CN 202111333591A CN 113909734 A CN113909734 A CN 113909734A
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- 238000005476 soldering Methods 0.000 title claims description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 143
- 239000002184 metal Substances 0.000 claims abstract description 143
- 238000005219 brazing Methods 0.000 claims abstract description 141
- 239000000945 filler Substances 0.000 claims abstract description 67
- 238000002844 melting Methods 0.000 claims abstract description 37
- 230000008018 melting Effects 0.000 claims abstract description 31
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 24
- 239000002923 metal particle Substances 0.000 claims abstract description 8
- 230000004907 flux Effects 0.000 claims description 31
- 229910045601 alloy Inorganic materials 0.000 claims description 25
- 239000000956 alloy Substances 0.000 claims description 25
- 229910000679 solder Inorganic materials 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 11
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 9
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 8
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 229910000676 Si alloy Inorganic materials 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 35
- 238000003466 welding Methods 0.000 abstract description 25
- 238000000034 method Methods 0.000 abstract description 22
- 230000008569 process Effects 0.000 abstract description 15
- 229910001092 metal group alloy Inorganic materials 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 23
- 239000012752 auxiliary agent Substances 0.000 description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 description 4
- 238000003490 calendering Methods 0.000 description 4
- 238000010587 phase diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/282—Zn as the principal constituent
-
- 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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- 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
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a high-conductivity flux-cored brazing sheet, which belongs to the field of brazing, in particular to the field of aluminum alloy brazing, and comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than the melting point of the metal, the metal is wound and connected with the brazing filler metal or metal particles made of the metal are filled in the brazing filler metal and pressed into a sheet shape, and a certain amount of high-melting-point metal material is placed in the sheet-shaped brazing filler metal alloy to penetrate through two surfaces of the sheet-shaped brazing filler metal to form a stable conductive channel. The channel material does not melt during the welding process and remains in the weld joint after welding without affecting the strength of the joint. Therefore, the conductivity of the whole welding process is ensured, the conditions of sparking and splashing explosion of welding materials in large current are avoided, and the welding quality is ensured.
Description
Technical Field
The invention belongs to the field of brazing, particularly relates to the field of aluminum alloy brazing, and particularly relates to a high-conductivity flux-cored brazing sheet.
Background
The aluminum motor is a development direction of the motor industry at present, and the aluminum material replaces the copper material to be used as a coil material of the large motor, so that the aluminum motor has the advantages of being cheap, reducing weight and facilitating construction. The coil is composed of a large number of aluminum wires having a rectangular cross section. After the aluminum wires are installed one by one in the assembly stage, they are connected end to end with each other. The connection of the conducting wire needs to ensure the conductivity and the strength by welding.
The current method mainly used is fusion welding (argon arc welding). This way can guarantee welding strength and electric conductivity.
However, argon arc welding is inefficient and takes several minutes per joint. In motors with up to a thousand joints, argon arc welding undoubtedly greatly limits the production efficiency.
A more serious disadvantage is that in order to save space, the aluminum wires are arranged very closely, the wire joints are very close, and the welding gun for argon arc welding is difficult to penetrate other wire joints and extend into the assembly space to weld the inner welding port.
The argon arc welding has the major defect that the temperature is very high, the temperature of local electric arc reaches ten thousand ℃, and after two joints are continuously welded, the temperature of a lead is very high, so that adjacent insulating coating materials are easily damaged. In order to solve this problem, the process design must wait for the joint temperature to drop before the coating of the local insulating material is performed after the welding is completed. This seriously affects the coating quality and production efficiency.
In the production of conventional copper machines，Resistance heating brazing processes are commonly used by practitioners. The copper coil joint is clamped by a clamp made of conductive graphite, and copper-phosphorus brazing alloy is preset between the joints. After the power is on, the graphite chuck is heated by a huge current, so that the copper material is heated, and then the copper-phosphorus brazing alloy is heated. After the melting point of the alloy is reached, the brazing filler metal alloy melting liquid is linked with the copper material under the action of phosphorus elements in the copper-phosphorus brazing filler metal alloy, and a good joint is formed after cooling to complete brazing. Compared with argon arc welding, the process has the advantages of convenient construction, high efficiency and low temperature.
However, this process is difficult to implement in the production of aluminum electrical machines. This is because there is no solder alloy available that can "self-braze" like copper phosphorus alloys in the alternative materials for aluminum brazing. Flux must be additionally added in the brazing of aluminum materials, however, flux powder is insulating, and if the flux is coated on the surface of the aluminum brazing alloy according to a general scheme, a current path cannot be formed when a joint is heated, so that a graphite chuck cannot be heated, and the brazing cannot be completed.
There is therefore a need for an aluminium alloy brazing material which is both electrically conductive and provides sufficient brazing aid.
The applicant of the present invention conceived a way to make flux cored aluminum alloy brazing filler metal in the course of development. The brazing filler metal alloy is made into a flat tube shape, the flat tube is filled with the flux powder, or the thinner flux-cored wire is coiled into a flat ring shaped like a clip or an S shape. These two solder forming methods are theoretically possible to solve the problem. However, in the actual use process, the problems of sparking and explosion occur, and the use cannot be realized at all.
The reason why the problem of sparking explosion occurs is that the flowing state of the melted brazing filler metal is unstable in a small space of a joint due to the fluctuation of factors such as human, machine, material, method, ring and the like during specific construction, and the brazing flux clamped in the tubular brazing filler metal cannot flow out in time and cannot dissolve oxides on the surface of metal in time. This causes local poor conduction in the gradual softening and flowing process of the solder, and local current is too large due to too small contact area, and the solder is rapidly gasified by joule heat. Then local arcs are initiated because of the very short electrical gap. Such arcs can impact the local materials to be burned, and particularly the brazing aids can decompose and gasify in the event of instantaneous overheating. This causes the surface of the base material to discolor, even to be over-sintered and melted, and the light one cannot continue to complete the brazing, and the heavy one causes the base material to be scrapped.
Therefore, a need exists for a sheet aluminum alloy brazing material that is stable in electrical conductivity, does not spark, and provides sufficient flux.
Disclosure of Invention
The invention aims at the aspect of aluminum alloy brazing and provides a flaky aluminum alloy brazing material which can be stably conductive, does not spark and can provide enough soldering flux.
In order to solve the problems, the adopted material design scheme is to provide metal materials with high melting points which are arranged in a sheet-shaped brazing alloy and penetrate through two surfaces of the sheet-shaped brazing alloy to form a stable conductive channel with a certain area. The channel material does not melt during the welding process and remains in the weld interface after welding without affecting the strength of the joint. Therefore, the condition that the conductive contact area is too small cannot occur, and the welding quality and the conductivity can be well guaranteed.
Specifically, the method comprises the following steps: when the low-melting-point brazing filler metal is a zinc-aluminum alloy, the brazing auxiliary agent is FB502S brazing auxiliary agent powder in JB/T6045-2017 soldering flux for brazing standard. The high melting point metal is selected from zinc alloy or aluminum alloy with the liquidus line more than 20 ℃ higher than that of the low melting point solder.
The zinc-aluminum alloy as the low melting point brazing filler metal is preferably Zn 78-98% and Al 2-22%. For example: zn 98% Al 2% alloy, Zn 95% Al 5% alloy, Zn 85% Al 15% and Zn 78% Al 22% alloy.
The aluminum alloys containing zinc and aluminum as the high melting point metal are preferably BAl95Si, BAl92Si, BAl90Si and BAl88Si in GB/T13815-2008 "aluminum-based brazing filler".
When the low-melting-point brazing filler metal is aluminum-silicon alloy, the brazing auxiliary agent is FB501S brazing auxiliary agent powder in the standard JB/T6045-2017 soldering flux for brazing. The high melting point metal is selected from aluminum alloy with the liquidus higher than that of the low melting point solder by more than 20 ℃.
The aluminum-silicon alloys described above as low melting point solders are preferably BAl88Si, BAl90Si, and BAl92Si in GB/T13815-.
The aluminum alloy containing the aluminum-silicon alloy as the high-melting metal is preferably SAl 1070 in GB/T10858-.
In addition, the scheme also discloses a preparation method of the high-conductivity flux-cored brazing sheet.
The preparation method comprises the following steps: a hollow pipeline is arranged in the low-melting-point alloy, and then the brazing auxiliary agent is canned in the pipeline to prepare the seamless flux-cored wire, wherein the content of the brazing auxiliary agent is 5-20% (the brazing auxiliary agent accounts for the total weight of the seamless flux-cored wire). The seamless flux-cored wire and the high-melting-point metal wire are mutually wound. This wound body is then calendered into a sheet form by a calender.
Preferably, the material is selected to be a high-melting-point metal wire and one to three seamless flux-cored wires made of low-melting-point metal which are mutually wound. Preferably, a high melting point metal wire is intertwined with a seamless flux-cored wire made of a low melting point metal.
Preferably, the winding mode is that the seamless flux-cored wire made of low-melting metal is tightly wound on a high-melting metal wire at the center.
Preferably, the diameter of the middle high-melting-point metal wire is larger than that of the seamless flux-cored wire made of the low-melting-point metal and is smaller than twice of that of the seamless flux-cored wire made of the low-melting-point metal.
In addition, the scheme also discloses another preparation method of the high-conductivity flux-cored brazing sheet.
Taking brazing filler metal and metal, preparing the metal into metal particles, and placing the metal particles in the brazing filler metal; and rolling into sheets by a rolling mill.
Compared with the prior art, the high-conductivity flux-cored soldering sheet disclosed by the invention can be stably conductive, does not spark and can provide enough soldering flux.
Drawings
Fig. 1 is a schematic structural diagram of one to ten embodiments of the highly conductive flux-cored soldering sheet of the present invention.
FIG. 2 is a schematic structural diagram of an eleventh embodiment of the highly conductive flux-cored soldering sheet of the present invention
FIG. 3 is a gold phase diagram of the welding interface of the first embodiment.
Fig. 4 is an enlarged view of the metallographic phase of the first embodiment.
FIG. 5 is a gold phase diagram of the first embodiment.
FIG. 6 shows a golden phase diagram of the first embodiment corresponding to the eleventh embodiment.
Detailed Description
The following detailed description of the present invention will be provided by way of specific embodiments with reference to the accompanying drawings, which are provided for illustration purposes only and are not to be construed as further limiting the present invention.
The first embodiment is as follows:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is BAl95Si in GB/T13815-2008 aluminum-based solder.
The low-melting-point brazing filler metal is zinc-aluminum alloy, wherein Zn accounts for 98% and Al accounts for 2%.
The soldering flux in the flux-cored solder is FB502S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
In FIG. 3, the region A is the base material to be welded and is commercially pure aluminum. Zone B is the metal component Zn98Al alloy in the flux cored solder and zone C is BAl95Si metal. It can be seen that the filling effect of the whole brazing interface is outstanding, and the transition layers are also well diffused.
As shown in FIG. 4, further observation of the metallurgical change revealed that the Zn98Al2 alloy and B alloy could be observed more clearlyATransition diffusion layer between al95Si alloy.
Also better brazing results were obtained in a wider area of Al95Si, as shown in fig. 5.
Example two:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is BAl92Si in GB/T13815-2008 aluminum-based solder.
The low-melting-point brazing filler metal is zinc-aluminum alloy, wherein Zn accounts for 95% and Al accounts for 5%.
The soldering flux in the flux-cored solder is FB502S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
Example three:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is BAl90Si in GB/T13815-2008 aluminum-based solder.
The low-melting-point brazing filler metal is zinc-aluminum alloy, wherein Zn accounts for 85% and Al accounts for 15%.
The soldering flux in the flux-cored solder is FB502S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
Example four:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is BAl88Si in GB/T13815-2008 aluminum-based solder.
The low-melting-point brazing filler metal is zinc-aluminum alloy, wherein the Zn accounts for 78% and the Al accounts for 22%.
The soldering flux in the flux-cored solder is FB502S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
Example five:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is SAl 1070 in GB/T10858-.
The low-melting-point brazing filler metal is silicon-aluminum alloy which is BAl88Si in GB/T13815-2008 aluminum-based brazing filler metal.
The soldering flux in the flux-cored solder is FB501S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
Example six:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is SAl 1070 in GB/T10858-.
The low-melting-point brazing filler metal is silicon-aluminum alloy which is BAl90Si in GB/T13815-2008 aluminum-based brazing filler metal.
The soldering flux in the flux-cored solder is FB501S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
Example seven:
fig. 1 shows a high-conductivity flux-cored brazing sheet, which comprises metal and brazing filler metal, wherein the melting point of the brazing filler metal is lower than that of the metal, and the brazing filler metal is wound and connected with the metal and pressed into a sheet shape.
The high-melting-point metal is aluminum alloy which is SAl 1070 in GB/T10858-.
The low-melting-point brazing filler metal is silicon-aluminum alloy which is BAl92Si in GB/T13815-2008 aluminum-based brazing filler metal.
The soldering flux in the flux-cored solder is FB501S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
In addition, the invention also discloses a preparation method of the high-conductivity flux-cored soldering sheet, which comprises the following specific embodiments:
example eight:
as shown in fig. 1, a low melting point brazing filler metal is arranged in a hollow pipeline, and then a brazing auxiliary agent is canned in the hollow pipeline to prepare the seamless flux-cored wire, wherein the brazing auxiliary agent accounts for 5% of the total weight of the seamless flux-cored wire. The seamless flux-cored wire and the high-melting-point metal wire are mutually wound. This wound body is then calendered into a sheet form by a calender.
The material is selected to be a high-melting-point metal wire and three seamless flux-cored wires made of low-melting-point metal which are mutually wound.
The diameter of the middle high melting point metal wire is twice that of the seamless flux-cored wire made of low melting point metal.
Example nine:
as shown in fig. 1, a low melting point brazing filler metal is arranged in a hollow pipeline, and then a brazing auxiliary agent is canned in the hollow pipeline to prepare the seamless flux-cored wire, wherein the brazing auxiliary agent accounts for 20% of the total weight of the seamless flux-cored wire. The seamless flux-cored wire and the high-melting-point metal wire are mutually wound. This wound body is then calendered into a sheet form by a calender.
A high melting point metal wire is wound with a seamless flux-cored wire made of a low melting point metal.
The diameter of the middle high-melting-point metal wire is slightly larger than that of the seamless flux-cored wire made of the low-melting-point metal.
Example ten:
as shown in fig. 1, a low melting point brazing filler metal is arranged in a hollow pipeline, and then a brazing auxiliary agent is canned in the hollow pipeline to prepare the seamless flux-cored wire, wherein the brazing auxiliary agent accounts for 15% of the total weight of the seamless flux-cored wire. The seamless flux-cored wire and the high-melting-point metal wire are mutually wound. This wound body is then calendered into a sheet form by a calender.
The winding mode is that a seamless flux-cored wire made of low-melting metal is tightly wound on a high-melting metal wire at the center.
The diameter of the middle high-melting-point metal wire is 1.5 times of that of the seamless flux-cored wire made of the low-melting-point metal.
Example eleven:
as shown in fig. 2, this embodiment corresponds to the first embodiment to the second embodiment, and the difference is that: the metal and the brazing filler metal are wound and connected, and metal particles made of metal are filled in the brazing filler metal and pressed into sheets.
As shown in fig. 6, when an alternative embodiment was used, a distinct granular BAl95Si was observed to appear in the linker (C). The number of particles actually observed is lower than the one we have added, while in the gold phase diagram it is also observed that the concentrated crystals (D) which are clearly rich in silicon are likely to appear because many particles are eroded by the zinc-aluminium alloy due to the problem of heating, so the boundaries are not clear.
Blank case one:
a flame brazing mode is adopted, a flux-cored brazing bar made of Zn98Al alloy is held by hand, and brazing seams are filled continuously in the heating process until the brazing seams are filled fully. After testing the tensile strength, dissecting the section and detecting the metallographic phase. And selecting a sample which is completely filled and has no macroscopic obvious defects as a qualified sample.
Blank case two:
the low-melting point brazing filler metal is made into a sheet and is heated by adopting the resistance brazing heating process. When heating, two aluminum wires are externally bundled by aluminum wires to be used as an external conductive channel, so that the phenomena of sparking and splashing are prevented. After testing the tensile strength, dissecting the section and detecting the metallographic phase. And selecting a sample which is completely filled and has no macroscopic obvious defects as a qualified sample.
The low-melting-point brazing filler metal is zinc-aluminum alloy, wherein Zn accounts for 98% and Al accounts for 2%.
The soldering flux in the flux-cored solder is FB502S soldering assistant powder in the standard of JB/T6045-2017 soldering flux for brazing.
Strength test: the sheets made in the case were: 0.7mm thick, 11.5mm wide, 28mm long. Two 10mm thick 12.5mm wide aluminum wires were lapped, the lap length being 28 mm. By using the heating method, a joint of 28mm by 12.5mm is formed.
Intensity values: (GB/T228.1-2010 metallic Material tensile test) three averages were taken.
The detection of the metallographic effect mainly focuses on the existence of microscopic defects, the state of a diffusion layer and the composition of an interface. Microscopic defects are difficult to avoid in brazing, however, the defects are small and small, and discontinuities can ensure application reliability.
In order to be able to realize industrial applications, the materials must be able to be successfully produced in large quantities at an acceptable cost. In the technology, the processing manufacturability problems encountered in the actual production process mainly include: 1. the affinity between different metals has a great influence, and after high-pressure bonding, the bonding surfaces between different metals need to have certain bonding strength to ensure that the integrity is maintained in the grinding and pressing process. 2. Since the present technique is a sheet material obtained by grinding, the stress of different materials due to the difference in ductility during grinding is excessive, and material deformation occurs. 3. In the metal grinding and pressing process, different metals have fatigue and other changes, annealing treatment is needed, the annealing times are more, the material is more unstable, and the cost is higher. 4. The material in the wound form is asymmetrically stressed and stretched at different positions during the grinding process, which results in different lower limits of the grinding thickness of the material.
All four of the above problems must be solved to be industrially implementable. The examples in the table above are all solutions that allow a smooth, cost-acceptable industrial production within the processing limits described.
Blank case description: the blank cases one and two are mainly for obtaining an optimal result. When the metallographic examination gave better welding results (good filling, no imperfections) it was considered that this was the best result for this material on this lap joint structure. Blank case one is compared with the traditional process, and blank case two is compared with the traditional material under the resistance heating process. The problem of sparking and splashing is avoided by adding extra conductive paths externally, the strength obtained in this case being a standard result that can be considered as the material under the process.
We can observe that the strength data of the material obtained by the present technique is not inferior to that of the conventional material, and the added high melting point metal has no adverse effect on the brazing result.
Introduction of the principle: and providing a plurality of high-melting-point metal materials which are arranged in the flaky solder alloy and penetrate through two surfaces of the flaky solder to form a stable conductive channel with a certain area. The channel material does not melt during the welding process and remains in the weld interface after welding without affecting the strength of the joint. Therefore, the condition that the conductive contact area is too small cannot occur, and the welding quality and the conductivity can be well guaranteed.
Compared with the prior art, the high-conductivity flux-cored soldering sheet disclosed by the invention can be stably conductive, does not spark and can provide enough soldering flux.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A high-conductivity flux-cored soldering sheet is characterized in that: the brazing filler metal is wound and connected with the brazing filler metal or the metal is made into metal particles and filled in the brazing filler metal, and the metal particles are pressed into sheets.
2. The highly conductive flux-cored brazing sheet according to claim 1, wherein: the metal is zinc alloy or aluminum alloy, and the brazing filler metal is flux-cored brazing filler metal.
3. A highly conductive flux-cored brazing sheet according to claim 1 or 2, wherein: the high melting point metal is zinc alloy or aluminum alloy which is BAl95Si, BAl92Si, BAl90Si and BAl88Si in GB/T13815-2008.
4. The highly conductive flux-cored brazing sheet according to claim 3, wherein: the low-melting-point brazing filler metal is a zinc-aluminum alloy, wherein the Zn accounts for 78-98% and the Al accounts for 2-22%.
5. The highly conductive flux-cored brazing sheet according to claim 4, wherein: the flux in the flux-cored solder is FB502S brazing auxiliary powder in JB/T6045-2017 standard.
6. A highly conductive flux-cored brazing sheet according to claim 1 or 2, wherein: the high-melting-point metal is aluminum alloy which is SAl 1070 in GB/T10858-.
7. The highly conductive flux-cored brazing sheet according to claim 6, wherein: the low melting point brazing filler metal is aluminum-silicon alloy which is BAl88Si, BAl90Si and BAl92Si in GB/T13815-2008.
8. The highly conductive flux-cored brazing sheet according to claim 7, wherein: the flux in the flux-cored solder is FB501S brazing auxiliary powder in JB/T6045-2017 standard.
9. A preparation method of a high-conductivity flux-cored soldering sheet is characterized by comprising the following steps: the preparation steps are as follows:
s1: taking brazing filler metal and metal, and mutually winding the brazing filler metal and the metal;
s2: and rolling the winding body into a sheet shape through a rolling machine.
10. A preparation method of a high-conductivity flux-cored soldering sheet is characterized by comprising the following steps: the preparation steps are as follows:
s1: taking brazing filler metal and metal, preparing the metal into metal particles, and placing the metal particles in the brazing filler metal;
s2: and rolling into sheets by a rolling mill.
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