JPH0475119B2 - - Google Patents
Info
- Publication number
- JPH0475119B2 JPH0475119B2 JP62297721A JP29772187A JPH0475119B2 JP H0475119 B2 JPH0475119 B2 JP H0475119B2 JP 62297721 A JP62297721 A JP 62297721A JP 29772187 A JP29772187 A JP 29772187A JP H0475119 B2 JPH0475119 B2 JP H0475119B2
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- flux
- aluminum
- polybutene
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005219 brazing Methods 0.000 claims description 48
- 239000000463 material Substances 0.000 claims description 44
- 230000004907 flux Effects 0.000 claims description 40
- 229910052782 aluminium Inorganic materials 0.000 claims description 34
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 34
- 229920001083 polybutene Polymers 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 239000002612 dispersion medium Substances 0.000 description 11
- 239000012535 impurity Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000011162 core material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005253 cladding Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- SKFYTVYMYJCRET-UHFFFAOYSA-J potassium;tetrafluoroalumanuide Chemical compound [F-].[F-].[F-].[F-].[Al+3].[K+] SKFYTVYMYJCRET-UHFFFAOYSA-J 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910020239 KAlF4 Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000004580 weight loss Effects 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
- B23K35/22—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
- B23K35/3601—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 with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
ａ 発明の目的
（産業上の利用分野）
この発明に係るアルミニウム材のろう付方法
は、アルミニウム、或はアルミニウム合金（本明
細書では、これらを総称してアルミニウム材とす
る。）同士をろう付して、各種製品を造る場合に
利用するもので、例えばラジエータやコンデンサ
等として使用されるアルミニウム材製の熱交換器
を造る場合に利用される。
（従来の技術）
例えばアルミニウム材製の熱交換器を造る場
合、アルミニウム材製の伝熱管と、同じくアルミ
ニウム材製の放熱フインとを組み合わせた状態
で、これら伝熱管とフインとを加熱炉中で加熱
し、予め伝熱管とフインとの当接面間に介在させ
たろう材（Siを５〜16％含むアルミニウム合金）
を溶融させ、このろう材によつて伝熱管とフイン
とをろう付する様にしている。
このろう付作業の際、伝熱管やフインを構成し
ているアルミニウム材の表面の酸化膜を破壊し
て、伝熱管とフインとのろう付が良好に行なわれ
る様にする為、ろう付部にフラツクスを塗布する
事が広く行なわれている。
この様なアルミニウム材同士のろう付に使用す
るフラツクスとして従来から、特公昭58−27037
号公報に開示されている様なものが知られてい
る。
この公報に開示されたフラツクスは、65.6〜
99.9％のKAlF4と34.4〜0.1％のK3AlF6とから成
るもので、『NOCOLOK FLUX』（商品名）とし
て一般に市販されている。
このフラツクスは、従来から知られている他の
フラツクスに比べてろう付性が良好で、しかもろ
う付後に生じる残渣にアルミニウム材に対する腐
食性がない事から、ラジエータやコンデンサ、或
はエバポレータ等のアルミニウム製熱交換器を製
造する場合に広く使用されている。
（発明が解決しようとする問題点）
ところが、上述の様なフラツクスを使用して行
なう、従来のアルミニウム材のろう付に於いて
も、依然として次に述べる様な不都合を生じる。
即ち、従来のろう付方法に於いては、何れのフ
ラツクスを使用する場合に於いても、水を分散媒
として使用し、ろう付に使用するフラツクスを分
散媒としての水の中に所定濃度で分散し、懸濁液
としていた。
この懸濁液は、ろう付前にろう付部分に塗布す
るが、フラツクスは本来、伝熱管とフインとの接
触部等、ろう付部にのみ塗布すれば良く、それ以
外の部分に塗布しても、フラツクスが無駄に消費
されるだけでなく、ろう付後の残渣がフインの表
面に付着して、通気抵抗を増大させたり、更に残
渣が著しく多い場合には、この残渣がフインを詰
らせたりしてしまう。
ところが、水を分散媒として使用した場合、フ
ラツクスの懸濁液の粘度は極く小さいものとなつ
て（流動性が極めて良くなつて）、この懸濁液を
ろう付部にのみ塗布する事は極めて困難となる。
この為従来は、ろう付に必要な部分だけでなく、
それ以外の部分にもフラツクスの懸濁液を、スプ
レー等によつて塗布していた為、ろう付後に上述
の様な問題が生じる事が避けられなかつた。
分散媒として水の代りに合成樹脂を使用する事
も一部で研究されてはいるが、現状に於いては、
合成樹脂を使用した場合、ろう付時の加熱に伴な
つて合成樹脂が炭化する事で、ろう付後に炭素粉
末が残留し、ろう付性の面からも、残渣処理の面
からも好ましくないとされている。
フラツクスを使用する事なく、アルミニウム材
同士をろう付する方法として、10-3〜10-5Torr
の高真空中でろう付を行なう、真空ろう付法が知
られているが、この真空ろう付法の場合、防食の
為にアルミニウム材中に含有させたZnが、ろう
付の為の加熱時に飛散してしまい、Znを添加す
る事に伴なう犠牲腐食作用が弱くなつて、ろう付
によつて得られるアルミニウム材製品に十分な耐
食性を期待出来なくなつてしまう。
本発明のアルミニウム材のろう付方法は、フラ
ツクスの分散媒を工夫する事で、上述の様な不都
合を何れも解消するものである。
ｂ 発明の構成
（問題を解決するための手段）
本発明のアルミニウム材のろう付方法に於いて
は、フラツクスを分散させる為の分散媒として、
イソブチレンを主体とする共重合体で末端に１個
の二重結合を有し、構造式
で表わされるポリブテンを使用する。
ろう付を行なう場合には、この様なポリブテン
中にフラツクスを均一に分散混合したものを、対
となつて互いにろう付されるアルミニウム材の内
の、少なくとも一方のアルミニウム材の表面に塗
布した後、上記対となるアルミニウム材を非酸化
性雰囲気中で加熱し、対となるアルミニウム材の
間に存在するろう材を溶融させる。
又、フラツクスとしては、前記特公昭58−
27037号公報に開示され、『NOCOLOK FLUX』
として市販されている、65.6〜99.9％のKAlF4と
34.4〜0.1％のK3AlF6とから成るものを使用する。
（作用）
本発明のアルミニウム材のろう付方法に於い
て、フラツクスの分散媒として使用されるポリブ
テンは、流動性はあるにしても、水に比べて十分
に大きな粘性を有する為、フラツクスを必要とす
るろう付部分にのみ、これを塗布する事が可能と
なり、フラツクスの使用量を少なく抑えると同時
に、ろう付後に於けるフラツクス残渣を少なくす
る事が出来る。
又、ポリブテンは、アルミニウム材同士のろう
付温度（通常600℃程度）以下の約300℃で解重合
して昇華する為、ろう付後にカーボン残渣が生じ
る事もなく、ろう付性の悪化やフインの目詰り等
を生じる事もない。
ポリブテンと、フラツクスを構成するKAlF4
及びK3AlF6は、両者を混ぜた場合に何れも化学
変化を起したりする事はない為、フラツクスの分
散媒としてポリブテンを使用した場合に於いて
も、『NOCOLOK FLUX』の有する優れたろう
付性は、そのまま発揮される。
尚、本発明を実施する場合に於いては、ポリブ
テン中へのフラツクスの添加量は、10〜50％の範
囲が好ましい。
これは、添加量が10％未満の場合、フラツクス
の絶対量が不足して、ろう付性を低下させ、50％
を越えて添加した場合、フラツクスの分散がなさ
れずに流動性が悪くなり、ろう付部分への塗布が
困難となる為である。
（実施例）
次に、本発明の効果を確認する為に行なつた実
施例に就いて説明する。
本発明に於いて、フラツクスの分散媒として使
用するポリブテンの加熱時に於ける変化を確認す
る為、分子量が1000のポリブテンを加熱炉中に入
れ、このポリブテンの重量を測定しつつ、この加
熱炉内の温度を第１図の曲線ａで示す様に徐々に
上昇させた所、ポリブテンの重量は、同図に曲線
ｂで示す様に減少し、450℃程度でほぼ100％昇華
して、後には何の残渣も残らなかつた。
この事から、ポリブテンが、アルミニウム材の
ろう付温度である600℃よりも低い温度で解重合
し、完全に昇華する事が解つた。
尚、ポリブテンとしては、分子量が200〜2500
のものを使用出来るが、分子量によつて粘度が異
なる（分子量が多い程、粘度が高くなる。分子量
1000のもので、粘度は10000cp程度。）為、ろう
付部分の形状等に応じて適当な粘度（8000cp程
度のものが、熱交換器製造の際に、好ましく使用
出来る。）を有するポリブテンを選択する。但し、
粘度を低下させる為ならば、ポリブテンを有機溶
剤（パラフイン系炭化水素）によつて希釈する事
も出来る。
上述の様な性質を有するポリブテン中に混合す
るフラツクスとして、特公昭58−27037号に係る、
『NOCOLOK FLUX』として、カナダ国の会社
である『アルキヤン・リサーチ・アンド・デイベ
ロツプメント・リミテツド』が『NOCOLOK
100』として市販しているものを使用し、第２〜
３図に示す様な熱交換器のろう付を行なつた。
この熱交換器は、伝熱管１，１とフイン２，２
とから成るコア部３の両端に座板４，４を設けた
もので、伝熱管１，１とフイン２，２とがろう付
され、伝熱管１，１と座板４，４とがろう付され
る。
この様な熱交換器の伝熱管１を構成する為のア
ルミニウム材製板材として、厚さが0.34mmのクラ
ツド板を、フイン２を構成する為のアルミニウム
材製板材として、厚さ0.10mmのものを、座板４を
構成するアルミニウム材製板材として、厚さ1.0
mmのクラツド板を、それぞれ使用した。
この内、伝熱管１を構成するクラツド板は、芯
材の外面（伝熱管１の外周面に露出する面）にろ
う材である皮材を、内面（伝熱管１の内周面）に
防食の為の犠牲腐食層を、それぞれ10％のクラツ
ド率（板全体の厚さに対するクラツド層（皮材
層）の厚さの割合）でクラツド（両面で合計20
％）したもので、芯材にはJIS 3003材（Siが0.6
％以下、Feが0.7％以下、Cuが0.05〜0.20％、Mn
が1.0〜1.5％、Znが0.10％以下、その他の不純物
が、個々の物が0.05％以下で、不純物の合計が
0.15％以下とし、残りをAlとしたもの）を、皮材
にはJIS 4343材（Siが6.8〜8.2％、Feが0.8％以
下、Cuが0.25％以下、Mnが0.10％以下、Znが
0.20％以下、その他の不純物が、個々の物が0.05
％以下で、不純物の合計が0.15％以下とし、残り
をAlとしたもの）を、犠牲腐食層にはJIS 7072
材（SiとFeとが合計で0.7％以下、Cuが0.10％以
下、Mnが0.10％以下、Mgが0.10％以下、Znが
0.8〜1.3％、その他の不純物が、個々の物が0.05
％以下で、不純物の合計が0.15％以下とし、残り
をAlとしたもの）を、それぞれ使用した。
又、フイン用のアルミニウム材としては、JIS
3003材に1.5％のZnを添加したもの（Siが0.6％以
下、Feが0.7％以下、Cuが0.05〜0.20％、Mnが
1.0〜1.5％、Znが1.5％、その他の不純物が、個々
の物が0.05％以下で、不純物の合計が0.15％以下
とし、残りをAlとしたもの）を使用した。
更に座板４を構成するクラツド板としては、芯
材の片面（コア部３と対向する面）にろう材であ
る皮材を、10％のクラツド率でクラツドしたもの
で、芯材としてはJIS 3003材を、皮材としては
JIS 43433材を、それぞれ使用した。
それぞれ、上述の様なアルミニウム材製板材に
より造られた伝熱管１，１とフイン２，２と座板
４，４とは、第２図に示す様に組み合わせ、本発
明のろう付方法、従来の様に水を分散媒として使
用するろう付方法により、互いにろう付し、ろう
付後の熱交換器に就いて、それぞれ放熱性能と耐
久性とを試験した所、次頁の表に示す様な結果が
得られた。
尚、本発明のろう付方法を実施する場合に於い
ては、非腐食性雰囲気としてN2ガス雰囲気を使
用したが、ろう付時に於ける露点は−30℃とし、
フラツクスの塗布量は２〜３ｇ／m2とした。又、
分散媒として水の使用する従来法を実施する場合
に於いては、フラツクスの塗布量は５ｇ／m2とし
て、浸漬法によりフラツクスの塗布を行なつた。
又、ろう付を行なう際には、第２図に示す様に
組み合わされた伝熱管１とフイン２とを、150℃
で３分間予熱した後、600℃で３分間加熱して、
ろう付した。
a. Purpose of the invention (industrial application field) The method for brazing aluminum materials according to the present invention is a method for brazing aluminum or aluminum alloys (in this specification, these are collectively referred to as aluminum materials). It is used in the manufacture of various products, for example, in the manufacture of aluminum heat exchangers used as radiators, condensers, etc. (Prior art) For example, when manufacturing a heat exchanger made of aluminum material, heat transfer tubes made of aluminum material and heat radiation fins also made of aluminum material are combined, and these heat transfer tubes and fins are placed in a heating furnace. A brazing filler metal (aluminum alloy containing 5 to 16% Si) that has been heated and interposed in advance between the contact surfaces of the heat transfer tube and the fins.
The heat exchanger tube and the fins are brazed together using this brazing filler metal. During this brazing work, in order to destroy the oxide film on the surface of the aluminum material that makes up the heat exchanger tubes and fins, and to ensure good brazing between the heat exchanger tubes and fins, Applying flux is widely practiced. Traditionally, the flux used for brazing aluminum materials was
The one disclosed in the publication No. 1 is known. The flux disclosed in this publication is 65.6~
It is composed of 99.9% KAlF 4 and 34.4 to 0.1% K 3 AlF 6 , and is generally commercially available as "NOCOLOK FLUX" (trade name). This flux has better brazing properties than other conventionally known fluxes, and the residue produced after brazing is not corrosive to aluminum materials. Widely used in manufacturing heat exchangers. (Problems to be Solved by the Invention) However, even in the conventional brazing of aluminum materials using the above-mentioned flux, the following disadvantages still occur. That is, in the conventional brazing method, water is used as a dispersion medium, and the flux used for brazing is added to water as a dispersion medium at a predetermined concentration, regardless of which flux is used. It was dispersed and made into a suspension. This suspension is applied to the brazed parts before brazing, but originally flux only needs to be applied to the brazed parts, such as the contact area between the heat transfer tube and the fins, and should not be applied to other parts. Not only is flux wasted, but residue after brazing may adhere to the surface of the fin, increasing ventilation resistance, and if there is a significant amount of residue, this residue may clog the fin. I end up letting it happen. However, when water is used as a dispersion medium, the viscosity of the flux suspension becomes extremely small (fluidity is extremely good), so it is difficult to apply this suspension only to the brazed parts. It will be extremely difficult.
For this reason, in the past, not only the parts necessary for brazing,
Since the flux suspension was applied to other parts by spraying or the like, it was inevitable that the above-mentioned problems would occur after brazing. Although there is some research into using synthetic resin instead of water as a dispersion medium, at present,
When synthetic resin is used, the synthetic resin carbonizes as it heats up during brazing, leaving carbon powder behind after brazing, which is undesirable from both brazing properties and residue treatment. has been done. 10 -3 to 10 -5 Torr is a method for brazing aluminum materials together without using flux.
A vacuum brazing method is known in which brazing is performed in a high vacuum. As a result, the sacrificial corrosion effect associated with the addition of Zn becomes weaker, and aluminum products obtained by brazing cannot be expected to have sufficient corrosion resistance. The method for brazing aluminum materials of the present invention eliminates all of the above-mentioned disadvantages by devising a flux dispersion medium. b. Structure of the invention (means for solving the problem) In the method for brazing aluminum materials of the present invention, as a dispersion medium for dispersing flux,
A copolymer mainly composed of isobutylene, it has one double bond at the end and has the structural formula A polybutene represented by is used. When performing brazing, a mixture of flux uniformly dispersed in polybutene is applied to the surface of at least one of the aluminum materials to be brazed to each other in a pair. The pair of aluminum materials is heated in a non-oxidizing atmosphere to melt the brazing material present between the pair of aluminum materials. In addition, as a flux, the above-mentioned special public
Disclosed in Publication No. 27037, "NOCOLOK FLUX"
with 65.6-99.9% KAlF4 , commercially available as
34.4 to 0.1% K 3 AlF 6 is used. (Function) In the method of brazing aluminum materials of the present invention, polybutene used as a flux dispersion medium has fluidity but has sufficiently high viscosity compared to water, so flux is not necessary. This makes it possible to apply this only to the parts to be brazed, thereby reducing the amount of flux used and at the same time reducing the amount of flux residue left after brazing. In addition, polybutene depolymerizes and sublimates at about 300℃, which is below the brazing temperature between aluminum materials (usually about 600℃), so there is no carbon residue left after brazing, which can cause deterioration of brazing properties or fins. No clogging or the like occurs. Polybutene and KAlF 4 forming the flux
and K 3 AlF 6 do not cause any chemical change when they are mixed, so even when polybutene is used as a flux dispersion medium, the excellent wax possessed by ``NOCOLOK FLUX'' can be used. The adhesion properties are exhibited as they are. In carrying out the present invention, the amount of flux added to polybutene is preferably in the range of 10 to 50%. This is because if the amount added is less than 10%, the absolute amount of flux will be insufficient and the brazability will decrease, resulting in a 50%
This is because if it is added in excess of this amount, the flux will not be dispersed and its fluidity will deteriorate, making it difficult to apply it to the brazed parts. (Example) Next, an example carried out to confirm the effects of the present invention will be described. In the present invention, in order to confirm changes in polybutene used as a flux dispersion medium during heating, polybutene with a molecular weight of 1000 was placed in a heating furnace, and while the weight of this polybutene was measured, When the temperature of polybutene was gradually increased as shown by curve a in Figure 1, the weight of polybutene decreased as shown by curve b in the same figure, sublimated almost 100% at about 450°C, and later No residue was left behind. From this, it was found that polybutene depolymerizes and completely sublimates at a temperature lower than 600°C, which is the brazing temperature for aluminum materials. In addition, polybutene has a molecular weight of 200 to 2500.
However, the viscosity varies depending on the molecular weight (the higher the molecular weight, the higher the viscosity.
1000, the viscosity is about 10000 cp. ) Therefore, select polybutene with an appropriate viscosity (about 8000 cp can be preferably used when manufacturing heat exchangers) depending on the shape of the brazed part. however,
In order to lower the viscosity, polybutene can be diluted with an organic solvent (paraffinic hydrocarbon). As a flux to be mixed into polybutene having the above-mentioned properties,
``NOCOLOK FLUX'' is a Canadian company ``Alkyan Research and Development Limited'' is ``NOCOLOK FLUX''.
100'' on the market, and
The heat exchanger was brazed as shown in Figure 3. This heat exchanger consists of heat exchanger tubes 1, 1 and fins 2, 2.
The heat exchanger tubes 1, 1 and the fins 2, 2 are brazed together, and the heat exchanger tubes 1, 1 and the seat plates 4, 4 are brazed together. will be attached. A clad plate with a thickness of 0.34 mm is used as an aluminum plate material for constructing the heat transfer tube 1 of such a heat exchanger, and a clad plate with a thickness of 0.10 mm is used as an aluminum plate material for constructing the fins 2. As the aluminum plate material constituting the seat plate 4, the thickness is 1.0
mm clad plates were used, respectively. Among these, the clad plate that constitutes the heat exchanger tube 1 has a skin material that is a brazing material on the outer surface of the core material (the surface exposed on the outer circumferential surface of the heat exchanger tube 1), and a corrosion-protective coating on the inner surface (the inner circumferential surface of the heat exchanger tube 1). The sacrificial corrosion layer for each plate is cladded (total of 20% on both sides) with a cladding rate of 10% (the ratio of the thickness of the cladding layer (skin layer) to the thickness of the entire plate).
%), and the core material is JIS 3003 material (Si is 0.6
% or less, Fe 0.7% or less, Cu 0.05-0.20%, Mn
Zn is 1.0 to 1.5%, Zn is 0.10% or less, other impurities are 0.05% or less individually, and the total impurity is
0.15% or less, and the remainder is Al), and the skin material is JIS 4343 material (6.8 to 8.2% Si, 0.8% or less Fe, 0.25% or less Cu, 0.10% or less Mn, and 0.10% or less Zn).
0.20% or less, other impurities, individual substances 0.05
% or less, the total impurity is 0.15% or less, and the remainder is Al), and the sacrificial corrosion layer is JIS 7072
Material (Si and Fe total 0.7% or less, Cu 0.10% or less, Mn 0.10% or less, Mg 0.10% or less, Zn
0.8~1.3%, other impurities, individual items 0.05
% or less, the total impurity was 0.15% or less, and the remainder was Al). In addition, as aluminum material for fins, JIS
3003 material with 1.5% Zn added (Si 0.6% or less, Fe 0.7% or less, Cu 0.05-0.20%, Mn
1.0 to 1.5%, Zn was 1.5%, other impurities were 0.05% or less individually, the total impurity was 0.15% or less, and the remainder was Al). Furthermore, the cladding board constituting the seat plate 4 is made by cladding a skin material, which is a brazing material, on one side of the core material (the surface facing the core part 3) at a cladding rate of 10%, and the core material is JIS. 3003 material as a leather material
JIS 43433 materials were used for each. The heat exchanger tubes 1, 1, fins 2, 2, and seat plates 4, 4, each made of the above-mentioned aluminum plate materials, are combined as shown in FIG. The heat exchangers were brazed together using a brazing method that uses water as a dispersion medium, and the heat dissipation performance and durability of each heat exchanger after brazing were tested, as shown in the table on the next page. The results were obtained. In carrying out the brazing method of the present invention, a N2 gas atmosphere was used as a non-corrosive atmosphere, but the dew point during brazing was -30°C.
The amount of flux applied was 2 to 3 g/m 2 . or,
When carrying out the conventional method using water as a dispersion medium, the amount of flux applied was 5 g/m 2 and the flux was applied by dipping. Also, when brazing, heat transfer tubes 1 and fins 2 combined as shown in Fig. 2 are heated to 150°C.
After preheating at 600℃ for 3 minutes,
Brazed.
【表】
この上記の表に於いて、耐久性の試験は、ろう
付けされた熱交換器を−30℃で30分間冷却した
後、120℃で30分間加熱する行程を１サイクルと
して、熱交換器のシール部（座板４にゴム製のパ
ツキングを介して装着される合成樹脂製タンクと
座板４との間のパツキングによるシール部）に漏
れが発生する迄に要するサイクル数の多少によ
り、耐久性を判定する事で行なつた。比較例１の
耐久性が750とは、上記サイクルを750回行なつた
時点でシール部に漏れが発生した事を、本発明の
実施例の耐久性が1000以上とは、上記サイクルを
1000回行なつても、シール部に漏れが発生しなか
つた事を、それぞれ表わしている。この様に本発
明のろう付方法によつた場合にシール性に関する
耐久性が向上するのは、シール用のパツキングが
当接する座板４の表面に、フラツクス残渣による
細かい凹凸が形成されない為である。
更に、放熱性能は、比較例によつて造られた熱
交換器の放熱性能を100とし、本発明のろう付方
法により造られた全く同じ大きさの熱交換器の放
熱性能を、これ（比較例）の放熱性能と比較する
事で行なつた。
この様な試験の結果を示す前掲の表から明らか
な通り、本発明のろう付方法によりアルミニウム
材同士をろう付する場合、良好なろう付を行なう
事が出来、しかもフラツクスの残渣減少に伴なつ
て、熱交換器の性能及び耐久性が向上する事を確
認出来た。
ｃ 発明の効果
本発明のアルミニウム材のろう付方法は、以上
に述べた通り構成され実施される為、フラツクス
を必要な部分にのみ塗布する事が可能となつて、
フラツクスの使用量低減に伴なうろう付製品の製
作費低減を図れるだけでなく、余分なフラツクス
の残渣によるろう付製品の品質、性能の低下を防
止出来、耐久性の優れたアルミニウム材ろう付製
品を得る事が出来る。[Table] In the above table, the durability test was conducted by cooling the brazed heat exchanger at -30℃ for 30 minutes and then heating it at 120℃ for 30 minutes. Depending on the number of cycles required before leakage occurs in the seal part of the container (the seal part between the synthetic resin tank attached to the seat plate 4 via the rubber packing and the seat plate 4), This was done by evaluating durability. The durability of Comparative Example 1 of 750 means that leakage occurred in the seal after 750 cycles, and the durability of 1000 or more of the example of the present invention means that the above cycle was repeated 750 times.
Each figure indicates that no leakage occurred in the seal even after 1000 cycles. The reason why the durability in terms of sealing performance is improved when the brazing method of the present invention is used is that fine irregularities caused by flux residue are not formed on the surface of the seat plate 4 that the sealing packing comes into contact with. . Furthermore, the heat dissipation performance of the heat exchanger made by the comparative example is taken as 100, and the heat dissipation performance of the heat exchanger of exactly the same size made by the brazing method of the present invention is compared to this (comparison). This was done by comparing the heat dissipation performance of example). As is clear from the table above showing the results of such tests, when aluminum materials are brazed together using the brazing method of the present invention, it is possible to achieve good brazing, and moreover, there is a reduction in flux residue. It was confirmed that the performance and durability of the heat exchanger were improved. c. Effects of the Invention Since the method for brazing aluminum materials of the present invention is configured and carried out as described above, it is possible to apply flux only to the necessary areas.
Not only can the production cost of brazed products be reduced by reducing the amount of flux used, but also the quality and performance of brazed products can be prevented from deteriorating due to excess flux residue, making it possible to braze aluminum materials with excellent durability. You can get the product.
第１図は温度上昇に伴なうポリブテンの重量減
少の状態を示す線図、第２図は本発明のろう付方
法によつて造られるアルミニウム材製熱交換器の
正面図、第３図は同端面図である。
１：伝熱管、２：フイン、３：コア部、４：座
板。
Figure 1 is a diagram showing the weight loss of polybutene as the temperature rises, Figure 2 is a front view of an aluminum heat exchanger manufactured by the brazing method of the present invention, and Figure 3 is FIG. 1: heat transfer tube, 2: fin, 3: core, 4: seat plate.
Claims (1)
１個の二重結合を有し、構造式 で表わされるポリブテン中に、65.6〜99.9％の
KAlF4と34.4〜0.1％のK3AlF6とから成るフラツ
クスを均一に分散混合したものを、対となつて互
いにろう付けされるアルミニウム材の内に、少な
くとも一方のアルミニウム材の表面に塗布した
後、上記対となるアルミニウム材を非酸化性雰囲
気中で加熱し、対となるアルミニウム材の間に存
在するろう材を溶融させる、アルミニウム材のろ
う付方法。[Claims] 1. A copolymer mainly composed of isobutylene, having one double bond at the end, and having the structural formula 65.6 to 99.9% of the polybutene represented by
A uniformly dispersed mixture of a flux consisting of KAlF 4 and 34.4 to 0.1% K 3 AlF 6 was applied to the surface of at least one of the aluminum materials to be brazed to each other in pairs. A method for brazing aluminum materials, in which the pair of aluminum materials is then heated in a non-oxidizing atmosphere to melt the brazing material present between the pair of aluminum materials.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29772187A JPH01143796A (en) | 1987-11-27 | 1987-11-27 | Method for brazing aluminum |
| US07/246,778 US4906307A (en) | 1987-10-16 | 1988-09-20 | Flux used for brazing aluminum-based alloy |
| AU22757/88A AU584024B1 (en) | 1987-10-16 | 1988-09-23 | Flux used for brazing aluminum-based alloy |
| CA000578701A CA1320416C (en) | 1987-10-16 | 1988-09-28 | Flux used for brazing aluminum-based alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29772187A JPH01143796A (en) | 1987-11-27 | 1987-11-27 | Method for brazing aluminum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01143796A JPH01143796A (en) | 1989-06-06 |
| JPH0475119B2 true JPH0475119B2 (en) | 1992-11-27 |
Family
ID=17850315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29772187A Granted JPH01143796A (en) | 1987-10-16 | 1987-11-27 | Method for brazing aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01143796A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04333390A (en) * | 1991-05-07 | 1992-11-20 | Nippon Genma:Kk | Aluminum brazing paste |
| TW415867B (en) | 1998-07-29 | 2000-12-21 | Calsonic Corp | Method for applying flux for use in brazing aluminum material, flux coating apparatus, and method for manufacturing a heat exchanger |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5314138A (en) * | 1976-06-07 | 1978-02-08 | Massachusetts Inst Technology | Underwater submerged arc welding process and apparatus therefor |
| JPS5443853A (en) * | 1977-09-16 | 1979-04-06 | Fuyuujian Inc | Paste brazing material consisting of single structure element |
| JPS5827037A (en) * | 1981-07-30 | 1983-02-17 | ホホテンペラト−ル−レアクトルバウ・ゲゼルシヤフト・ミト・ベシユレンクタ・ハフツンク | Measuring device for tension |
| JPS5954496A (en) * | 1982-09-14 | 1984-03-29 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Brazing method and brazing paste |
-
1987
- 1987-11-27 JP JP29772187A patent/JPH01143796A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5314138A (en) * | 1976-06-07 | 1978-02-08 | Massachusetts Inst Technology | Underwater submerged arc welding process and apparatus therefor |
| JPS5443853A (en) * | 1977-09-16 | 1979-04-06 | Fuyuujian Inc | Paste brazing material consisting of single structure element |
| JPS5827037A (en) * | 1981-07-30 | 1983-02-17 | ホホテンペラト−ル−レアクトルバウ・ゲゼルシヤフト・ミト・ベシユレンクタ・ハフツンク | Measuring device for tension |
| JPS5954496A (en) * | 1982-09-14 | 1984-03-29 | インタ−ナシヨナル ビジネス マシ−ンズ コ−ポレ−シヨン | Brazing method and brazing paste |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01143796A (en) | 1989-06-06 |
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