JPH0144439B2 - - Google Patents
Info
- Publication number
- JPH0144439B2 JPH0144439B2 JP15496787A JP15496787A JPH0144439B2 JP H0144439 B2 JPH0144439 B2 JP H0144439B2 JP 15496787 A JP15496787 A JP 15496787A JP 15496787 A JP15496787 A JP 15496787A JP H0144439 B2 JPH0144439 B2 JP H0144439B2
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- flux
- aluminum
- immersion
- fluoride
- 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
Links
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 or 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 or 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrolytic Production Of Metals (AREA)
- Nonmetallic Welding Materials (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は、アルミニウム又はその合金部材の浸
漬ろう付け接合法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an immersion brazing method for joining aluminum or its alloy members.
(ロ) 背景技術
従来からの浸漬ろう付けは、一般に塩化ナトリ
ウム、塩化カリウム、塩化リチウムならびにフツ
化アルミニウム等のフツ化物からなるフラツクス
を耐火物槽中に溶融し、組立てられたろう付け部
材を該溶融液中に浸漬して、接合部にあらかじめ
クラツドされる又は置かれたろう材を溶融させて
接合部材を接合するもので、溶融フラツクスはそ
の本来の役割であるフラツクス効果の他に無酸化
加熱雰囲気と無酸化加熱媒体を構成するものであ
る。(B) Background Art Conventional immersion brazing generally involves melting a flux consisting of fluorides such as sodium chloride, potassium chloride, lithium chloride, and aluminum fluoride in a refractory tank, and then melting the assembled brazed parts into the refractory tank. This method joins joint members by immersing them in a liquid and melting the brazing filler metal that has been clad or placed in the joint beforehand.In addition to its original role as a flux, the molten flux also creates a non-oxidizing heating atmosphere. It constitutes a non-oxidizing heating medium.
これらのことから、浸漬によるろう付け接合方
法は、加熱炉によるろう付け法等に比して昇温速
度が早くかつ均一加熱が容易で、ろう付けの信頼
性が高いという特徴を有している。 For these reasons, the brazing joining method using immersion has the characteristics of a faster temperature rise rate, easier uniform heating, and higher reliability of brazing compared to brazing methods using a heating furnace. .
ところが、ろう付け温度と整合するフラツクス
溶融温度、流動性アルミニウムの表面清浄力なら
びにろう材の流れ誘導などの諸性質を持たせるた
めに開発されたフラツクス（塩化ナトリウム、塩
化カリウム、塩化リチウム、フツ化物など）は潮
解性が強く、鋼や銅などの金属を強く腐食し、ま
た導電性であるので電気機器の絶縁を破壊する欠
点がある。 However, fluxes (sodium chloride, potassium chloride, lithium chloride, fluoride, etc.) have strong deliquescent properties and strongly corrode metals such as steel and copper, and because they are conductive, they have the disadvantage of destroying the insulation of electrical equipment.
フラツクスの潮解性は、ろう付け温度の580〜
620℃においても、フラツクス中に水分が存在し
てアルミニウムを激しく酸化させ、ろう付けを阻
害する。 The deliquescent property of flux is from 580℃ to the brazing temperature.
Even at 620°C, moisture is present in the flux, severely oxidizing aluminum and inhibiting brazing.
このため、溶融フラツクスはあらかじめ表面の
浄化されたアルミニウム板をフラツクス中に浸漬
して水と反応させ、水素と酸化アルミニウムとし
て脱水する必要がある。また、溶融フラツクスは
長時間にわたる空気との接融が避けられず、脱水
作業を繰り返し行なう必要がある。しかも、脱水
作業でできた酸化アルミニウムなどの沈殿物の除
去作業も欠かせない等の問題があつた。 For this reason, it is necessary to immerse an aluminum plate whose surface has been purified in advance in the molten flux to react with water and dehydrate it into hydrogen and aluminum oxide. Furthermore, the molten flux cannot avoid being in contact with air for a long period of time, requiring repeated dehydration operations. Moreover, there were problems such as the necessity of removing precipitates such as aluminum oxide produced during dehydration.
(ハ) 発明の開示
本発明は、潮解性のないフラツクスによる浸漬
ろう付け法を提案するものである。(C) Disclosure of the Invention The present invention proposes an immersion brazing method using a non-deliquescent flux.
即ち、本発明は潮解性を持たない塩化バリウム
（BaCl2）、塩化ナトリウム（NaCl）ならびに塩
化カリウム（KCl）を主とし、これにフツ化物を
加えて、化学活性化のあるフラツクスとしたもの
である。 That is, the present invention mainly uses barium chloride (BaCl 2 ), sodium chloride (NaCl), and potassium chloride (KCl), which do not have deliquescent properties, and adds fluoride to them to create a chemically activated flux. be.
例えば、BaCl2、NaCl及びKClの重量比がそれ
ぞれ54.7：18.0：27.3の共融塩の融点は540℃であ
る。またアルミニウム硬ろうのAl−Si基合金の
溶融温度が564〜580℃であり、ろう付け作業温度
が580〜615℃であることから、上記共融塩の溶融
温度540℃はアルミニウム又はその合金のろう付
けフラツクスとして適当である。 For example, a eutectic salt containing BaCl 2 , NaCl, and KCl in a weight ratio of 54.7:18.0:27.3, respectively, has a melting point of 540°C. Furthermore, since the melting temperature of the Al-Si base alloy of aluminum hard solder is 564 to 580°C and the brazing temperature is 580 to 615°C, the melting temperature of the eutectic salt is 540°C. Suitable as a brazing flux.
また、フラツクスの化学的活性化のために、フ
ツ化物例えばフツ化アルミニウム（AlF3）やフ
ツ化ナトリウム（NaF）などを混合するが、こ
の場合によるフラツクスの溶融温度は570℃好ま
しくは565℃まで昇温してもよいので、上記共融
塩が540℃であるから、30℃（又は25℃）の余裕
がなおあることとなる。これは、フツ化物の種類
と量の選択に幅があり、また共融塩の混合比にも
幅を持たせることができることになる。 In addition, in order to chemically activate the flux, a fluoride such as aluminum fluoride (AlF 3 ) or sodium fluoride (NaF) is mixed, but the melting temperature of the flux in this case is 570℃, preferably 565℃. Since the temperature may be increased, since the temperature of the eutectic salt is 540°C, there is still a margin of 30°C (or 25°C). This means that there is a wide range of selection in the type and amount of fluoride, and also in the mixing ratio of the eutectic salt.
この場合、塩化バリウム、塩化ナトリウム、塩
化カリウム及びフツ化物の重量比の範囲は、それ
ぞれ55〜47％、18〜22％、27〜33％、１〜20％で
ある。 In this case, the weight ratio ranges of barium chloride, sodium chloride, potassium chloride and fluoride are 55-47%, 18-22%, 27-33% and 1-20%, respectively.
従つて、従来の塩化物フラツクスを用いた場合
と異なつて、本発明の方法に用いられるフラツク
スは潮解性がないために溶融フラツクス中の水分
の脱水作業を行なう必要はないが、長時間の運転
作業中に溶融フラツクス中に生じる徴量の不純物
（金属、水分、酸素等）を除去して、より高精度
のろう付けを保証する必要がある。 Therefore, unlike the case of using a conventional chloride flux, the flux used in the method of the present invention is not deliquescent, so there is no need to dehydrate the water in the molten flux, but it does not require long-term operation. Significant impurities (metal, moisture, oxygen, etc.) that occur in the molten flux during operation must be removed to ensure higher precision brazing.
このため、本発明は直流電解法によりこれらの
不純物を容易にかつ必要に応じて除去する方法を
提案するものである。 Therefore, the present invention proposes a method for easily removing these impurities as needed by direct current electrolysis.
(ニ) 実施例
実施例 １
BaCl2、NaCl及びKClの粉末を重量比で54.7
％、18.0％23.3％と、これに重量比10％のNaF粉
末を混合し、黒鉛電極を炉内槽底部に対向して設
けられた耐火レンガ製電極炉で溶融し、610℃±
３℃に保持し、空気雰囲気電気炉で560℃±５℃
に予熱したAl−Si基のアルミニウム合金ろう付
け接合部材を該溶融フラツクス中に浸漬し、610
℃に昇温して３分間保持後に取出した。その後、
空冷、湯洗、洗浄剤による洗浄でフラツクスを除
去し、部材表面を清浄化した。(D) Examples Example 1 BaCl 2 , NaCl and KCl powders in a weight ratio of 54.7
%, 18.0% 23.3%, and NaF powder of 10% by weight were mixed with this, and a graphite electrode was melted in a refractory brick electrode furnace installed opposite the bottom of the furnace tank, and heated to 610℃±
Maintained at 3℃ and heated to 560℃±5℃ in air atmosphere electric furnace
A preheated Al-Si based aluminum alloy brazed joint member is immersed in the molten flux,
The temperature was raised to °C, held for 3 minutes, and then taken out. after that,
The flux was removed by air cooling, hot water washing, and washing with a detergent to clean the surface of the parts.
ろう付けの結果は全接合部が充分なフイレツト
を形成し、強固な接合部材が得られた。 As a result of brazing, all joints formed sufficient fillets, and a strong joint member was obtained.
さらに、12時間後と24時間後に上記したところ
と同様に事前の脱水作業を行なうことなく同一の
電気炉中で浸漬ろう付けを行なつたが、上記と同
様に良好な接合が得られた。 Furthermore, after 12 and 24 hours, immersion brazing was carried out in the same electric furnace without performing the dehydration work in advance, and good joints were obtained in the same manner as above.
また、電気炉から昇る蒸気はベタついておら
ず、蒸気も潮解性のないものであつて、作業環境
に悪影響を与えないことも認められた。 It was also confirmed that the steam rising from the electric furnace was not sticky and non-deliquescent, and did not adversely affect the working environment.
上記したろう付け作業を更に引続き行ない運転
を重ねたところ、ろう付け時にアルミニウム合金
ろう付け接合部材の表面に黒色付着物が認められ
るに至つた。 When the above-mentioned brazing operation was continued and the operation was repeated, black deposits were observed on the surface of the aluminum alloy brazed joint member during brazing.
そこで、ろう付けを中断して、フラツクス中の
不純物を除去する目的で、アルミニウム電極２枚
を610℃の溶融フラツクス中に対向させ、電極間
に直流2Vをかけ、電流値3Aで１時間直流電解し
た（電極単位面積当り0.05A／cm2）。 Therefore, in order to interrupt the brazing and remove impurities in the flux, two aluminum electrodes were placed facing each other in a molten flux at 610°C, a DC 2V was applied between the electrodes, and DC electrolysis was performed at a current value of 3A for 1 hour. (0.05 A/cm 2 per unit area of electrode).
その後ろう付け作業をしたところ、アルミニウ
ムろう付け表面は光輝状態で接合された。 When brazing work was then carried out, the aluminum brazed surfaces were joined in a bright state.
これは、溶融フラツクス中の長時間の運転中に
生じた微量の不純物である金属及び水分、酸素が
除去されたためである。 This is because trace amounts of impurities such as metal, moisture, and oxygen that were generated during long-term operation in the molten flux were removed.
実施例 ２
電極抵抗加熱によるニツケル−モリブデン合金
のポツトを用いて、実施例１と同一組成のフラツ
クスを溶融し、同一条件でろう付けしたところ、
良好な接合が得られた。Example 2 Using a nickel-molybdenum alloy pot heated by electrode resistance, a flux having the same composition as in Example 1 was melted and brazed under the same conditions.
A good bond was obtained.
長時間運転後、ろう付け時にアルミニウム表面
に黒色付着物が増加した。 After long-term operation, black deposits increased on the aluminum surface during brazing.
そこで、運転を止め、実施例１と同様にフラツ
クスを直流電解した。 Therefore, the operation was stopped, and the flux was subjected to DC electrolysis in the same manner as in Example 1.
その結果、アルミニウムろう付け部材の表面に
は光輝状態で接合された。 As a result, it was bonded to the surface of the aluminum brazing member in a bright state.
(ホ) 発明の効果
本発明は上記のようにBaCl、NaCl、KClとフ
ツ化物とでフラツクスを用いたろう付け方法にお
いて、フラツクスを常時清浄に保つことができ、
アルミニウム又はその合金のろう付け性に必要な
化学活性や溶融ろうとの置換性、ろう材に対応す
るフラツクスの融点などを満足しながら、従来の
フラツクスによる浸漬ろう付けでの脱水作業のほ
とんどを省略することができ、また炉底部の沈殿
物除去の軽減や吸水によるフラツクスの組成変化
の減少など多くの優れた効果をあげることができ
る。(E) Effects of the Invention As described above, the present invention is capable of keeping the flux clean at all times in the brazing method using flux with BaCl, NaCl, KCl and fluoride.
It satisfies the chemical activity required for the brazing properties of aluminum or its alloys, the replaceability with molten solder, and the melting point of the flux corresponding to the brazing filler metal, while omitting most of the dehydration work in conventional flux-based immersion brazing. It also has many excellent effects, such as reducing the need to remove sediment from the bottom of the furnace and reducing changes in flux composition due to water absorption.
特に、フラツクスが容易に清浄化できるので、
アルミニウム被ろう付け部材はその表面が光輝状
態でろう付けされる利点は卓越したところであ
る。 Especially since the flux can be easily cleaned,
An outstanding advantage of aluminum brazing parts is that their surfaces are brazed in a bright state.
本発明は以上の如く、信頼性の高いろう付け性
を維持しつつ、作業性や経済性を大きく改善した
浸漬ろう付け接合方法を提供することができるも
のである。 As described above, the present invention can provide an immersion brazing joining method that greatly improves workability and economic efficiency while maintaining highly reliable brazing performance.
Claims (1)
その合金部材を、55〜47重量％の塩化バリウムと
18〜22重量％の塩化ナトリウムと27〜33重量％の
塩化カリウムと１〜20重量％のフツ化物とからな
る溶融フラツクス中に浸漬してろう付けする方法
であつて、該溶融フラツクスはろう付け前に直流
電解して必要に応じ浄化してなることを特徴とす
るアルミニウム又はその合金部材の浸漬ろう付け
法。1. Aluminum or its alloy member with brazing material applied in advance is mixed with 55 to 47% by weight barium chloride.
A method of brazing by immersion in a molten flux consisting of 18 to 22% by weight of sodium chloride, 27 to 33% by weight of potassium chloride, and 1 to 20% by weight of fluoride, the molten flux being used for brazing. A method for immersion brazing of aluminum or its alloy members, characterized in that aluminum or its alloy members are first subjected to direct current electrolysis and purified as necessary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15496787A JPS63317297A (en) | 1987-06-22 | 1987-06-22 | Dip brazing method for aluminum or its alloy member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15496787A JPS63317297A (en) | 1987-06-22 | 1987-06-22 | Dip brazing method for aluminum or its alloy member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63317297A JPS63317297A (en) | 1988-12-26 |
| JPH0144439B2 true JPH0144439B2 (en) | 1989-09-27 |
Family
ID=15595811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15496787A Granted JPS63317297A (en) | 1987-06-22 | 1987-06-22 | Dip brazing method for aluminum or its alloy member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63317297A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10314700A1 (en) | 2003-03-31 | 2004-10-14 | Behr Gmbh & Co. Kg | Method for producing surface-modified workpieces |
-
1987
- 1987-06-22 JP JP15496787A patent/JPS63317297A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63317297A (en) | 1988-12-26 |
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