KR101157494B1 - Filler metal alloy composition - Google Patents
Filler metal alloy composition Download PDFInfo
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- KR101157494B1 KR101157494B1 KR1020100082233A KR20100082233A KR101157494B1 KR 101157494 B1 KR101157494 B1 KR 101157494B1 KR 1020100082233 A KR1020100082233 A KR 1020100082233A KR 20100082233 A KR20100082233 A KR 20100082233A KR 101157494 B1 KR101157494 B1 KR 101157494B1
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Abstract
In the present invention, in the filler metal alloy composition brazing welded to the connection portion between the base material so that the base material of the same material or different materials can be stably bonded to each other, silver (Ag), copper (Cu), zinc (Zn), Tin (Sn), lithium (Li) and other unavoidable impurities, the composition ratio of the filler metal composition is 20-24% by weight of silver (Ag), 36-45% by weight of copper (Cu), zinc (Zn) 29- A filler metal composition comprising 39% by weight, 1-3% by weight of tin (Sn), 0.1-1.0% by weight of lithium (Li) and other unavoidable impurities is disclosed. The filler metal alloy composition of the present invention can significantly reduce the manufacturing cost compared to the electrode composed of a conventional Ag, Cu, Zn, Sn, Si, and the oxide film to reduce the bonding properties by the oxidation of the base metal oxide film is reduced Applicable to various base materials.
Description
The present invention relates to a filler metal composition, and more specifically, by minimizing the content of silver (Ag) and adding tin (Sn) and lithium (Li) components, the appearance of welded parts and the spreadability of the filler metal, bonding properties, etc. A good filler metal composition is disclosed.
In general, welding is divided into welding and soldering, which are welding using filler metal, and pressure welding, which is welding without filler material. Here, in the fusion welding and soldering, the base materials are joined to each other through the filler metal between the welded materials (base materials) to be joined.
The brazing is a method of melting a welded portion and a filler material of the base material and melting the welded portion of the base material without melting the welded portion of the base material. The soldering is performed by soldering, which is a low melting point and brazing, It is divided.
Among the filler metals used in the welding and soldering, the silver solder filler metal is the most representative of the precious metal filler materials, and the joining temperature is lower than that of other filler metals and the heat affected zone on the base material is less.
In addition, the silver lead filler material has been widely used for joining large members such as electronic products, industrial equipment, and equipment because of easy joining and excellent bonding to various materials.
The basic composition of the silver lead filler material is usually a ternary system of Ag-Cu-Zn, and alloys containing Cd, Ni, Sn, In, Mn, etc. have been developed in accordance with the purpose of use, such as workability, joint strength, and corrosion resistance.
As the silver lead filler material, for example, Ag-Cu-Zn filler metal composition is applied for refrigerant circulation pipe brazing, and the filler metal alloy composition applied to Ag-Cu-Zn system for refrigerant circulation pipe brazing is brazing. Indium (In) is added to lower the melting point of the alloy and increase flowability.
Specifically, the conventional filler metal alloy composition includes 30 to 40% by weight of silver (Ag), 34 to 38% by weight of copper (Cu), 33% by weight of zinc (Zn), and 1.2% by weight of indium (In). In particular, the conventional filler metal alloy composition is manufactured and used, including 30% by weight of silver (Ag), 35.8% by weight of copper (Cu), 33% by weight of zinc (Zn), and 1.2% by weight of indium (In).
On the other hand, the filler metal composition as described above is applied as a welding rod in the brazing welding operation of the refrigerant circulation pipe, wherein the refrigerant circulation pipe is usually used aluminum-zinc (Al-Zn) coated steel pipe.
Here, when the aluminum-zinc (Al-Zn) coated steel material is bonded by a welding rod made of the conventional filler metal alloy composition, when bonding between the same material, that is, aluminum-zn (Al-Zn) coated steel material, due to the characteristics of the material The joinability of the joint is not good.
In addition, the aluminum-zinc (Al-Zn) coated steel material is not a homogeneous material, that is, even when the joining of the other material, that is, aluminum-zinc (Al-Zn) coated steel material and other materials is not good bonding.
Therefore, in the aluminum-zinc (Al-Zn) coated steel pipe as described above, when bonding by brazing welding, a buffing operation is preceded by a pretreatment operation, and a polishing operation of the coating portion is performed as a prior process.
In this case, the buffing operation is to grind the surface of the aluminum-zinc (Al-Zn) coated steel pipe, so that the surface of the coated steel pipe is fully buffed until the surface state of the coated steel pipe is welded. Proceed with multiple buffing operations.
As described above, the filler metal alloy composition according to the prior art is used by adding indium (In) to lower the melting point of the brazing alloy and increase the flowability, the silver (Ag) component contains more than 30% by weight Is being applied.
However, the filler metal alloy composition according to the prior art has a problem that the manufacturing cost is high because the expensive silver (Ag) component content is high. Moreover, there is a problem that the manufacturing cost is increased by adding indium (In) which is a rare metal and expensive.
In addition, the filler metal alloy composition according to the prior art has a problem in that the zinc (Zn) vaporization phenomenon occurs because of the high vapor pressure (Vnor pressure) at the time of manufacturing the zinc (Zn) is near each boiling point.
In addition, there is a problem in that the zinc (Zn) vaporization phenomenon has a harmful effect on the worker, and also a problem that has a harmful effect during the welding operation with the welding rod formed of the filler metal composition prepared There was this.
There was a problem in that harmful effects on the worker even during welding with the manufactured filler material. In addition, during the manufacturing process of the conventional filler metal, slag is formed of a large amount of oxide in the molten metal, and when the filler metal billet is extruded, an extreme oxidation scale is formed on the surface due to the high temperature heating of the billet, and waste is generated after the extrusion. There was a problem that the surface is discolored.
In order to solve the above problems, the present invention is a filler metal composition excellent in appearance and good spreadability and bonding properties of the welded part by minimizing the content of silver (Ag) and adding a small amount of tin (Sn) and lithium (Li), and the like. It is an object to provide a composite material formed using a filler metal composition.
In order to achieve the above object,
In the filler metal alloy composition brazing welded to the connection portion between the base material so that the same base material or different material base material can be stably bonded to each other, silver (Ag), copper (Cu), zinc (Zn), tin (Sn) ), Lithium (Li) and other unavoidable impurities,
The composition ratio of the filler metal composition is 20-24 wt% silver (Ag), 36-45 wt% copper (Cu), 29-39 wt% zinc (Zn), 1-3 wt% tin (Sn), lithium (Li) ) 0.1-1.0 wt% and other unavoidable impurities.
Here, the composition ratio of the filler metal alloy composition is a composition ratio of the filler metal alloy composition is 20-22% by weight of silver (Ag), 38-43% by weight of copper (Cu), 33-39% by weight of zinc (Zn), tin (Sn) 1-3 wt%, lithium (Li) comprises 0.1-0.3 wt% and other unavoidable impurities.
In order to achieve the above another object, the present invention
A composite material formed by liquefying and curing the filler metal composition including silver (Ag), copper (Cu), zinc (Zn), tin (Sn), lithium (Li), and other unavoidable impurities above a melting temperature and curing the same. to provide.
In the filler metal alloy composition of the present invention, the following effects can be obtained by minimizing the content of silver (Ag) and adding a small amount of tin (Sn) and lithium (Li).
First, there is an advantage that the manufacturing cost can be significantly reduced compared to the welding rod composed of conventional Ag, Cu, Zn, Sn, Si.
Secondly, the base metal oxide film may be applied to various base materials in which an oxide film having a redox function reduces the adhesion.
Third, base materials of the same type or different types of base materials are stably bonded to each other, and the appearance of welded parts is excellent, and the spreadability and the bonding property are good.
Figure 1 shows the spreadability test results according to an embodiment of the present invention.
Figure 2a to 2d is a picture showing the appearance of the welded portion in the pipe connection welding according to the prior art.
3A and 3B illustrate external appearance photographs of a welded part when welding a pipe connection according to an embodiment of the present invention.
4A to 4D are photographs showing a cross-sectional state of a welded part when welding a pipe connection according to the related art.
5a and 5b is a photograph showing a cross-sectional state of the welded portion when welding the pipe connection according to an embodiment of the present invention.
In the present invention, in the filler metal alloy composition brazing welded to the connection portion between the base material so that the base material of the same material or different materials can be stably bonded to each other, silver (Ag), copper (Cu), zinc (Zn), Tin (Sn), lithium (Li) and other unavoidable impurities, the composition ratio of the filler metal composition is 20-24% by weight of silver (Ag), 36-45% by weight of copper (Cu), zinc (Zn) 29- It provides a filler metal composition comprising 39% by weight, 1-3% by weight of tin (Sn), 0.1-1.0% by weight of lithium (Li) and other unavoidable impurities.
The compositional component ratio of the filler metal alloy composition is preferably a composition ratio of the filler metal composition 20-22% by weight of silver (Ag), 38-43% by weight of copper (Cu), 33-39% by weight of zinc (Zn), tin (Sn) ) 1-3% by weight, lithium (Li) of 0.1-0.3% by weight and other unavoidable impurities.
The composition ratio of the filler metal alloy composition is most preferably the composition ratio of the filler metal composition is 20-22% by weight of silver (Ag), 38-43% by weight of copper (Cu), 33-39% by weight of zinc (Zn), tin ( Sn) 1-3 wt%, lithium (Li) 0.1 wt% and other unavoidable impurities.
The present invention minimizes the content of silver (Ag) in the existing Ag-Cu-Zn filler metal composition and adds a small amount of tin (Sn) and lithium (Li) to significantly reduce manufacturing costs compared to conventional electrodes. In view of the fact that the reducing oxide film is applicable to various base materials, the reference to silver (Ag), copper (Cu), and zinc (Zn), which are commonly used components, will be omitted.
The content of silver (Ag) in the filler metal alloy composition of the present invention is 20-24% by weight, preferably 20-22% by weight. Compared with the filler metal alloy composition containing 30 wt% silver (Ag) according to the prior art, the hardness is significantly higher. Therefore, the manufacturing cost can be reduced by 20-30% compared to using a conventional 30% by weight of the electrode.
Tin (Sn) has a very low melting point can lower the alloy melting point, it can have the effect of improving the flow rate, wettability, penetration of the alloy composition. It is added to lower the melting point and improve spreadability instead of the existing cadmium (Cd).
The content of tin (Sn) added in the alloy composition is preferably 1-3% by weight. If the content is less than 1% by weight, the amount of tin is too small and the effect of the addition is insignificant. Therefore, when the content is more than about 3% by weight, the spreadability and fragility become poor and the workability is very poor. Not desirable
Lithium (Li) has a tendency to gather at the interface between the filler metal and the base material, and this action promotes wettability because it increases the fluidity of the filler metal and reduces the oxide film of the base material. Until now, it has been applied to filler metals containing aluminum (Al) or titanium (Ti) or high Ag filler metals. The content of lithium (Li) to be added is preferably a small amount of 0.1-0.3% by weight. If the amount is less than 0.1% by weight, the content of lithium is so small that the effect of addition is insignificant, which is not preferable. If the content is more than about 0.3%, the production is not easy and the improvement of the effect is not preferable.
In the filler metal composition of the present invention, when tin (Sn) and lithium (Li) are added in combination, the improvement in width is greater than the degree of spreadability at the time of addition. When only tin (Sn) is added alone, there is an improvement in spreadability, but when tin (Sn) and lithium (Li) are added together, synergistic effects may occur.
When only lithium (Li) alone was added, there was a slight improvement in spreadability, but there was little difference in spreadability, and it would be far less than when tin (Sn) and lithium (Li) were added together.
According to another aspect of the present invention, in the filler metal composition of the filler metal composition brazing welded to the connection portion between the base material so that the base material of the same material or the heterogeneous material can be stably bonded to each other, the composition ratio of the filler metal composition is silver ( Ag) 20-24% by weight, 36-45% by weight of copper (Cu), 29-39% by weight of zinc (Zn), 1-3% by weight of tin (Sn), 0.1-1.0% by weight of lithium (Li) and other unavoidable It provides a composite material formed by liquefying and curing the filler metal alloy composition containing impurities at a melting temperature or more.
Such a composite material is manufactured by using the filler metal alloy composition according to the present invention, and includes a welding result obtained by using the electrode. The filler metal alloy composition of the present invention may be welded by applying a variety of conventional welding methods, and the result of the welding may include tin (Sn) and lithium (Li), and the content of each component also depends on the composition ratio of the present invention. Can be formed.
The present invention will be described in more detail with reference to the following Examples, which should not be construed as being limited or limited to the Examples.
Example
Example 1
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 37.4 wt% zinc (Zn), 1.5 wt% tin (Sn), and 0.1 wt% lithium (Li) was prepared.
Example 2
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 36.9 wt% zinc (Zn), 2.0 wt% tin (Sn), and 0.1 wt% lithium (Li) was prepared.
Example 3
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 35.9 wt% zinc (Zn), 3.0 wt% tin (Sn), and 0.1 wt% lithium (Li) was prepared.
Comparative Example 1
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), and 39 wt% zinc (Zn) was prepared.
Comparative Example 2
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 38 wt% zinc (Zn), and 1.0 wt% tin (Sn) was prepared.
Comparative Example 3
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 37.5 wt% zinc (Zn), and 1.5 wt% tin (Sn) was prepared.
Comparative Example 4
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 37.5 wt% zinc (Zn), and 1.5 wt% tin (Sn) was prepared.
Comparative Example 5
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 36 wt% zinc (Zn), and 3.0 wt% tin (Sn) was prepared.
Comparative Example 6
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 34 wt% zinc (Zn), and 5.0 wt% tin (Sn) was prepared.
Comparative Example 7
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 38.9 wt% zinc (Zn), and 0.1 wt% lithium (Li) was prepared.
Comparative Example 8
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 38.8 wt% zinc (Zn), and 0.2 wt% lithium (Li) was prepared.
Comparative Example 9
A filler metal composition including 20 wt% silver (Ag), 41 wt% copper (Cu), 38.7 wt% zinc (Zn), and 0.3 wt% lithium (Li) was prepared.
Evaluation and Results
<Expansion test method>
Spreadability (Spereadability) test is an Al-Zn-coated 50 mm × weight of 250 mg on a 50 mm × 1.2 mm steel plate and then cross-sectional area, place the insert metal 25cm 2 is prepared in the middle coating a flux 50LPG + 170O 2 Flame After shooting at the bottom of the steel plate for 5 seconds while keeping the distance from the steel plate at 10.5 cm, measure the spreading area of the electrode with respect to the whole area of the steel sheet by using an image analyzer, and obtain the actual spreading area according to the following equation. Was calculated. The spreadability test was conducted three times for each condition using a brazing machine [manufacturer: Hydrox Korea Co., Ltd.] to obtain an average.
<Expansion test result>
Figure 1 shows the spreadability test results according to an embodiment of the present invention. Referring to FIG. 1, Examples 1 to 3 showed an improvement in width larger than the degree of spreadability at the time of adding tin (Sn) and lithium (Li) in the complex addition. On the other hand, Comparative Examples 1 to 4 have an improvement in spreadability when the tin (Sn) is added, the tin (Sn) was the largest in the 3 wt% content.
However, in Comparative Example 5 having a tin (Sn) content of 5% by weight, a problem of workability due to excessive embrittlement occurs, and it can be seen that the critical content of tin (Sn) is preferably 3% by weight or less. Comparative Examples 5 and 6 showed a slight improvement in spreadability when lithium (Li) was added, but there was little difference in spreadability according to 0.1%, 0.2%, and 0.3% content.
<Joint test evaluation>
Bonding tests were conducted using the automatic mode of the brazing machine to rule out operator differences in skill during manual brazing. 0.2g of ring-type filler materials are prepared and Al-Zn-coated steel pipes are fastened using expansion pipes on one side, and then ring-shaped filler materials are mounted and flux is applied thereon. After preheating the fastening part for 2 seconds by applying the method, the joining material was heated by heating the filler metal part for 8 seconds. For airtightness and durability (vibration, pressure, etc.) of the joint, the filler metal should completely cover the end of the expansion pipe (the beginning of the joint), and the continuous penetration of the filler material between both tubes should be high. Therefore, the evaluation of the bonded specimens was performed by using a brazing machine (manufactured by Hydrox Korea Co., Ltd.) to observe the appearance (whether the filler metal completely covers the end of the expansion tube) and the cut surface (if the continuous penetration rate between the filler metal is high between both tubes). Evaluation was carried out with the eggplant.
<Joint test result>
Results of the bonding test are shown in FIGS. 2A to 2D, 3A and 3B.
3A and 3B show external photographs of the joints according to Example 1 and Example 2, respectively, and it can be confirmed that Example 1 and Example 2 have a good appearance. 2A to 2D show the external photographs of the joints according to Comparative Examples 3, 5, 7, and 8, respectively, and Comparative Examples 3, 7 and 8 were poor in appearance and Comparative Example 5 was normal in appearance. (Judged based on appearance factors of good, normal and bad judgment criteria).
The results of internal penetration are shown in FIGS. 4A-4D, 5A and 5B.
5A and 5B show cross-sectional photographs showing the appearance of internal penetration according to Example 1 and Example 2, respectively. 5A and 5B, Example 1 and Example 2 showed good internal penetration. 4A to 4D show cross-sectional photographs showing the appearance of internal penetration according to Comparative Examples 3, 5, 7, and 8, respectively. 4A to 4D, Comparative Examples 3, 5, 7, and 8 showed poor internal penetration. In Comparative Example 5, the appearance was normal, but the internal penetration was partially poor, and thus processing was impossible. The results of Examples 1 and 2 and Comparative Examples 3, 5, 7, and 8 are collectively shown in Table 1.
(Good: ○, normal: △, poor: X)
Although specific embodiments of the present invention have been described in detail above, the present invention is not limited thereto, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention as claimed in the claims. Modifications are possible and such variations are within the scope of the present invention.
Claims (4)
The composition ratio of the filler metal composition is 20-24 wt% silver (Ag), 36-45 wt% copper (Cu), 29-39 wt% zinc (Zn), 1-3 wt% tin (Sn), lithium (Li) ) Filler metal alloy composition comprising 0.1-1.0% by weight and other unavoidable impurities.
The composition ratio of the filler metal composition is 20-22 wt% silver (Ag), 38-43 wt% copper (Cu), 33-39 wt% zinc (Zn), 1-3 wt% tin (Sn), lithium (Li) And a 0.1-0.3% by weight and other unavoidable impurities.
The filler metal alloy composition, characterized in that the content of lithium is 0.1% by weight.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100082233A KR101157494B1 (en) | 2010-08-25 | 2010-08-25 | Filler metal alloy composition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100082233A KR101157494B1 (en) | 2010-08-25 | 2010-08-25 | Filler metal alloy composition |
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| KR20120019088A KR20120019088A (en) | 2012-03-06 |
| KR101157494B1 true KR101157494B1 (en) | 2012-06-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101231550B1 (en) | 2012-07-30 | 2013-02-07 | (주)알코마 | Cu-p-ag-zn brazing alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04339590A (en) * | 1991-05-10 | 1992-11-26 | Citizen Watch Co Ltd | Silver brazing filler metal |
| KR100246229B1 (en) | 1997-06-19 | 2000-04-01 | 구자홍 | Cd-free ag solder and flux |
| JP2000153389A (en) | 1998-11-18 | 2000-06-06 | Ngk Spark Plug Co Ltd | Brazing filler metal, and brazed body |
| KR100950686B1 (en) | 2009-09-08 | 2010-03-31 | 주식회사 한국번디 | Filler metal alloy compositions |
-
2010
- 2010-08-25 KR KR1020100082233A patent/KR101157494B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04339590A (en) * | 1991-05-10 | 1992-11-26 | Citizen Watch Co Ltd | Silver brazing filler metal |
| KR100246229B1 (en) | 1997-06-19 | 2000-04-01 | 구자홍 | Cd-free ag solder and flux |
| JP2000153389A (en) | 1998-11-18 | 2000-06-06 | Ngk Spark Plug Co Ltd | Brazing filler metal, and brazed body |
| KR100950686B1 (en) | 2009-09-08 | 2010-03-31 | 주식회사 한국번디 | Filler metal alloy compositions |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101231550B1 (en) | 2012-07-30 | 2013-02-07 | (주)알코마 | Cu-p-ag-zn brazing alloy |
| WO2014021580A1 (en) * | 2012-07-30 | 2014-02-06 | (주)알코마 | Ag-pb brazing alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20120019088A (en) | 2012-03-06 |
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