JPS6119357B2 - - Google Patents
Info
- Publication number
- JPS6119357B2 JPS6119357B2 JP3765677A JP3765677A JPS6119357B2 JP S6119357 B2 JPS6119357 B2 JP S6119357B2 JP 3765677 A JP3765677 A JP 3765677A JP 3765677 A JP3765677 A JP 3765677A JP S6119357 B2 JPS6119357 B2 JP S6119357B2
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- brazed
- furnace
- oxide film
- vacuum
- 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
- 238000005219 brazing Methods 0.000 claims description 64
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 239000000945 filler Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052787 antimony Inorganic materials 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 229910052712 strontium Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Description
この発明は、前処理としての酸化皮膜除去処理
を必要とすることなく、AlおよびAl合金部品を
短時間でろう付けする方法に関するものである。
最近、例えばカークーラー用コンデンサーやラ
ジエーターなどの自動車用熱交換器にはAlやAl
合金が使用され、これら材質の部品の組立てに
は、フラツクスを使用しないことによつてもたら
される種々の利点から、フラツクスなしろう付け
方法、特に真空ろう付け方法が適用されている。
すなわち、真空ろう付け方法においては、酸化皮
膜の厚さが薄い状態に保持されているので酸化皮
膜と素地金属とのろう付け加熱時の熱膨脹率の差
による前記皮膜の破壊が可能となり、この結果生
じた金属素地の再酸化が真空雰囲気によつて防止
されてろう材の流れを可能にすることから完全な
ろう付けが行なわれるのである。
しかしながら、上記真空ろう付け方法では、真
空度10-4〜10-5torrの高真空並び比較的長時間の
高温加熱を必要とするために、Al合金部品やろ
う材中に含有されている気化し易いMgやZn成分
などが気化して、真空ろう付け炉を汚染したり、
また前記成分の蒸発損失によるろう付け製品の強
度および耐食性低下を招き、特にカークーラー用
コンデンサーやラジエーターなどの使用環境のき
びしいものにおいてはかなりの腐食事故が発生
し、加うるに、Mg成分などを含有しないろう材
を使用する場合は前記トラブルは発生しないが、
そのかわり一層の高真空と面倒な酸化皮膜除去処
理を必要とする。
このようなことから、真空ろう付け後のAlお
よびAl合金製品に化成皮膜の形成や塗装などの
表面処理を施すことによつて腐食を防止する試み
もなされたが、この試みによつても完全な防食効
果は得られていない。
この発明は、上述のような観点から、ろう付け
に際してろう付け部品からのZnやMgなどの蒸発
損失が少なく、すなわちろう付け製品に強度低下
や耐食性低下などの発生がなく、しかも面倒な前
処理としての酸化皮膜除去処理を必要とすること
のない、AlおよびAl合金部品のフラツクスなし
ろう付けを比較的短かいサイクルで行なうことが
できる方法を提供するもので、
(a) ろう材として、重量％で、
Si：４〜16％，
Mg：0.2〜５％，
Zn：２〜10％，
Li，Ca，Ｋ，Na，Sr，Sb，Ba，およびBiの
うちの１種または２種以上：0.01〜２％，
を含有し、残りがAlと不可避不純物からなる
組成を有するものを使用し、
(b) ろう付けせんとするAlまたはAl合金部品
を、その酸化皮膜を除去することなく装入した
ろう付け炉内に、不活性ガスを導入することに
よつて前記炉内の残留ガスをパージすると共
に、前記炉内雰囲気を露点−50℃以下、酸素濃
度5ppm以下に調整し、この場合前記炉内残留
ガスのより迅速なパージを確実に行なうため
に、前記不活性ガスの導入に真空引きおよび／
または200℃以下の加熱を併用することが望ま
しく、
(c) このように調整された大気圧または多少プラ
ス圧の不活性ガス雰囲気中で、前記ろう付け部
品をろう付け温度に加熱し、この場合前記のよ
うに前記炉内雰囲気は大気圧または多少プラス
圧にして、露点−50℃以下、酸素濃度5ppm以
下に調整されているので、前記ろう付け部品お
よびろう材の酸化並びにこれに含有する気化し
易い金属の蒸発が防止されると共に、その加熱
が急速かつ均一に行なわれることになり、この
結果多数のろう付け部品のろう付け炉内への同
時装入が可能となると共に、加熱温度の不均一
によるろう材の未溶解および溶け過ぎが防止さ
れて、ろう付け製品の品質向上および生産性向
上がはかれ、
(d) ついで、前記ろう付け雰囲気をろう付け温度
に保持しながら真空度10-2〜10-3torr程度に真
空引きして、前記ろう材中に含有するMg，
Zn，Li，およびCaなどの気化し易い金属を蒸
発させて酸化皮膜を破壊し、これら金属の蒸発
は酸化皮膜破壊の引き金的役割をはたすと共に
ろう付け温度での保持時間の短縮化（通常１〜
２分の保持時間でよい）をはかつて前処理とし
て酸化皮膜除去処理なしでのろう付けを確実な
ものとし、
(e) 続いて再び前記真空引き炉内に不活性ガスを
導入して前記炉内を加熱時と同一の条件に調整
した状態で冷却することによつて、ろう付け製
品の酸化防止および急速にして均一な冷却によ
るろう付け時間の短縮をはかる
以上(a)〜(e)項に示される主要工程からなること
に特徴を有するものである。
この発明の方法において、ろう材の成分組成並
びに加熱時および冷却時のろう付け雰囲気条件を
上述のように限定した理由を説明する。
(A) ろう材の成分組成
(a) Si
Si成分にはろう材の溶融温度を低下させて
その流動性を向上させる作用があるが、その
含有量が４％未満では前記作用に所望の効果
が得られず、一方15％を越えて含有させると
再び溶融温度が上昇するようになつて好まし
くないことから、４〜15％と定めたが、望ま
しくは７〜12％の含有が好ましい。
(b) Mg
Mg成分にはSi成分と同様ろう材の溶融温
度を低下させてその流動性を向上させると共
に、ろう付け温度での真空引きによつて気化
して酸化皮膜の破壊の引き金となる作用があ
るが、その含有量が0.2％未満では前記作用
に所望の効果が得られず、一方５％を越えて
含有させるとろう付け部の表面着色がひどく
なることから、0.2〜５％と定めた。
(c) Zn
Zn成分には、ろう材の溶融温度を低下さ
せると共に、犠性陽極的防食効果を付与する
作用があるが、その含有量が２％未満では前
記作用に所望の効果が得られず、一方10％を
越えて含有させさせてもより一層の向上効果
が見られないことから、その含有量を２〜10
％と定めた。
(d) Li，Ca，Ｋ，Na，Sr，Sb，Ba，およびBi
これらの成分にも、Mg成分と同様にろう
材の溶融温度を低下させせると共に、流動性
向上させ、さらに酸化皮膜を破壊する作用が
あるほか、表面張力およびフイレツトの形成
を改善する作用があるが、その含有量が0.01
％未満では前記作用に所望の効果が得られ
ず、一方２％を越えて含有させてもより一層
の向上効果が得られないことから、その含有
量を0.01〜２％と定めた。なお、以下これら
の成分を総称してフイレツト改善成分とい
う。
(B) 雰囲気条件
露点−50℃および酸素濃度5ppmをそれぞれ
越えた雰囲気条件にすると、前記雰囲気中に含
有する水分および酸素の量が多くなり、ろう付
け部品およびろう材がこの水分および酸素によ
つて酸化されて、ろう付け時点での酸化皮膜の
破壊が充分に行なわれなくなると共に、気化し
易い金属の酸化消失も著しくなつて成分組成の
安定したろう付け製品を得ることができなくな
ることから、前記上限値以下の雰囲気条件にす
る必要がある。
つぎに、この発明を実施例により図面を参照し
ながら説明する。
実施例 １
厚さ0.48mmをもち、組成：Al−1.2％Mn
（AA3003材）をもつたAl合金板（コア材）の両
面に、それぞれ厚さ0.06mmをもち、第１表に示さ
れる組成をもつた本発明ろう材(1)〜(3)および比較
ろう材(1)をクラツドしたものからなる全体厚さ
0.6mmのブレージングシートと、厚さ0.2mmをも
ち、組成：Al−１％Zn（AA7072材、以上重量
％）をもつたAl合金薄板とを用意し、前記ブレ
ージングシートからは長さ100mm×巾50mmの寸法
をもつた
The present invention relates to a method for brazing Al and Al alloy parts in a short time without requiring oxide film removal treatment as a pretreatment. Recently, aluminum and aluminum are used in automotive heat exchangers such as car cooler condensers and radiators.
Alloys are used, and flux-free brazing methods, especially vacuum brazing methods, are used to assemble parts made of these materials because of the various advantages brought about by not using flux.
In other words, in the vacuum brazing method, since the thickness of the oxide film is kept thin, the film can be destroyed due to the difference in coefficient of thermal expansion during brazing heating between the oxide film and the base metal. The vacuum atmosphere prevents re-oxidation of the resulting metal matrix and allows flow of the brazing material, resulting in a perfect braze. However, the vacuum brazing method described above requires a high vacuum with a degree of vacuum of 10 -4 to 10 -5 torr and high temperature heating for a relatively long period of time, so the vapor contained in the Al alloy parts and brazing material is removed. Mg and Zn components that are easily oxidized may evaporate and contaminate the vacuum brazing furnace.
In addition, the strength and corrosion resistance of brazed products decrease due to evaporation loss of the above components, and considerable corrosion accidents occur especially in products that are used in harsh environments such as car cooler condensers and radiators. If you use a brazing filler metal that does not contain it, the above trouble will not occur, but
Instead, it requires an even higher vacuum and a troublesome oxide film removal process. For this reason, attempts have been made to prevent corrosion by applying surface treatments such as forming a chemical conversion film or painting to Al and Al alloy products after vacuum brazing, but these attempts have also failed to completely prevent corrosion. No anti-corrosion effect was obtained. From the above-mentioned viewpoints, this invention reduces the evaporation loss of Zn, Mg, etc. from the brazed parts during brazing, that is, there is no decrease in strength or corrosion resistance of the brazed product, and moreover, it does not require troublesome pretreatment. The present invention provides a method for fluxless brazing of Al and Al alloy parts in a relatively short cycle without the need for oxide film removal treatment as a filler metal. %, Si: 4-16%, Mg: 0.2-5%, Zn: 2-10%, one or more of Li, Ca, K, Na, Sr, Sb, Ba, and Bi: (b) Al or Al alloy parts to be brazed are charged without removing their oxide film. The residual gas in the furnace is purged by introducing an inert gas into the brazing furnace, and the atmosphere in the furnace is adjusted to a dew point of -50°C or less and an oxygen concentration of 5ppm or less. In order to ensure a more rapid purging of residual gases in the furnace, the introduction of said inert gas is accompanied by a vacuum and/or
(c) Heating the parts to be brazed to the brazing temperature in an inert gas atmosphere at atmospheric pressure or a slightly positive pressure adjusted in this way; As mentioned above, the atmosphere in the furnace is adjusted to atmospheric pressure or slightly positive pressure, with a dew point of -50°C or lower and an oxygen concentration of 5 ppm or lower, which prevents oxidation of the brazed parts and brazing metal, as well as the air contained therein. This prevents the evaporation of metals that are easily oxidized, and allows them to be heated rapidly and uniformly.As a result, it is possible to charge a large number of brazing parts into the brazing furnace at the same time, and the heating temperature can be reduced. Unmelted or overly melted brazing material due to non-uniformity is prevented, and the quality and productivity of brazed products are improved. The Mg contained in the brazing filler metal is removed by vacuuming to about -2 to 10 -3 torr.
Easily vaporized metals such as Zn, Li, and Ca are evaporated to destroy the oxide film, and the evaporation of these metals serves as a trigger for the oxide film destruction, as well as shortening the holding time at the brazing temperature (usually 1 ~
(2 minutes holding time is sufficient) was used as a pre-treatment to ensure brazing without oxide film removal treatment, (e) Then, inert gas was introduced into the vacuum furnace again and the furnace was heated. By cooling the brazed product under the same conditions as during heating, it is possible to prevent oxidation of the brazed product and shorten the brazing time by rapid and uniform cooling. Items (a) to (e) above. It is characterized by consisting of the main steps shown in the following. In the method of this invention, the reason why the component composition of the brazing material and the brazing atmosphere conditions during heating and cooling are limited as described above will be explained. (A) Component composition of the brazing filler metal (a) Si The Si component has the effect of lowering the melting temperature of the brazing filler metal and improving its fluidity, but if its content is less than 4%, the desired effect will not be achieved. However, if the content exceeds 15%, the melting temperature will rise again, which is undesirable. (b) Mg Mg component, like the Si component, lowers the melting temperature of the brazing filler metal and improves its fluidity, and also vaporizes when vacuumed at the brazing temperature, triggering the destruction of the oxide film. However, if the content is less than 0.2%, the desired effect cannot be obtained, while if the content exceeds 5%, the surface coloring of the brazed part will become severe. Established. (c) Zn The Zn component has the effect of lowering the melting temperature of the brazing filler metal and providing sacrificial anodic corrosion protection, but if its content is less than 2%, the desired effect cannot be obtained. On the other hand, even if the content exceeds 10%, no further improvement effect can be seen, so the content should be increased by 2 to 10%.
%. (d) Li, Ca, K, Na, Sr, Sb, Ba, and Bi. Like the Mg component, these components also lower the melting temperature of the brazing filler metal, improve fluidity, and form an oxide film. In addition to having a destructive effect, it also has the effect of improving surface tension and fillet formation, but the content is 0.01
If the content is less than 2%, the desired effect cannot be obtained, and if the content exceeds 2%, no further improving effect can be obtained. Therefore, the content was set at 0.01 to 2%. Hereinafter, these components will be collectively referred to as fillet improving components. (B) Atmospheric conditions If the atmospheric conditions exceed a dew point of -50°C and an oxygen concentration of 5 ppm, the amount of moisture and oxygen contained in the atmosphere will increase, and the parts and brazing metal to be brazed will be affected by this moisture and oxygen. As a result, the oxide film is not sufficiently destroyed at the time of brazing, and the oxidation loss of the easily vaporized metal becomes significant, making it impossible to obtain a brazed product with a stable component composition. Atmospheric conditions must be below the upper limit value. Next, the present invention will be described by way of examples with reference to the drawings. Example 1 Thickness: 0.48mm, composition: Al-1.2%Mn
The brazing fillers of the present invention (1) to (3) and the comparative brazing filler metals, each having a thickness of 0.06 mm and having the composition shown in Table 1, were applied to both sides of an Al alloy plate (core material) with (AA3003 material). Overall thickness consisting of clad material (1)
Prepare a 0.6 mm brazing sheet and an Al alloy thin plate with a thickness of 0.2 mm and a composition of Al-1% Zn (AA7072 material, weight %). with dimensions of 50mm
【表】
試験片を下板１として、また前記Al合金薄板か
らは長さ100mm×巾20mmの寸法をもつた試験片を
３枚１組にして上板２として切出し、第１図に正
面図で、第２図に側面図で示されるように下板１
の上面に上板２を10mm間隔をおいて並列立設した
状態に組立てて、ろう付け炉内に装入した。
ついで、上記本発明ろう材(1)〜(3)を適用した組
立て体に対しては、ろう付け炉内に不活性ガスと
しての窒素ガスを200℃に加熱しながら導入し
て、前記炉内残留ガスをパージすると共に、炉内
雰囲気を露点−50℃以下、酸化濃度5ppm以下に
調整し、このように調整した僅かにパラス圧（30
mm水柱）の雰囲気を保持しながら、ろう付け温度
である600℃に加熱し、ついで600℃に加熱した時
点で真空引きを行なつて１分間保持した後、再び
前記窒素ガスを導入することからなるろう付け
（本発明ろう付け方法）を施した。
一方、上記比較ろう材(1)を適用した組立て体に
対しては、真空度１×10-4torrの雰囲気中、ろう
付け温度600℃に１分間保持後炉冷の真空ろう付
けを施した。
つぎに、上記本発明ろう付け方法によつてろう
付けされたろう付け体（以下単に本発明ろう付け
体という）(1)〜(3)と、上記真空ろう付け方法によ
つてろう付けされたろう付け体（以下比較ろう付
け体という）(1)について、上板２の残留Zn量お
よび塩水噴霧試験（JIS規格による30日間塩水噴
霧）による下板１の腐食状態を測定した。この結
果が第２表に示されている。[Table] A test piece was cut out as the lower plate 1, and a set of 3 test pieces with dimensions of 100 mm in length x 20 mm in width were cut out from the Al alloy thin plate as the upper plate 2. Figure 1 shows the front view. Then, as shown in the side view in Fig. 2, the lower plate 1
The upper plates 2 were assembled in a state in which they were erected in parallel on the upper surface with an interval of 10 mm, and then charged into a brazing furnace. Next, for the assembly to which the brazing materials (1) to (3) of the present invention are applied, nitrogen gas as an inert gas is introduced into the brazing furnace while being heated to 200°C. In addition to purging the residual gas, the atmosphere inside the furnace was adjusted to a dew point of -50°C or less and an oxidation concentration of 5 ppm or less.
While maintaining an atmosphere of 2 mm water column), heat to the brazing temperature of 600°C, then after heating to 600°C, evacuate and hold for 1 minute, then reintroduce the nitrogen gas. Brazing (brazing method of the present invention) was performed. On the other hand, the assembly to which the comparative brazing filler metal (1) was applied was subjected to vacuum brazing in an atmosphere with a degree of vacuum of 1 × 10 -4 torr, at a brazing temperature of 600°C for 1 minute, and then cooling in a furnace. . Next, the brazed bodies (hereinafter simply referred to as the brazed bodies of the present invention) (1) to (3) brazed by the brazing method of the present invention described above, and the brazed bodies brazed by the vacuum brazing method described above. Regarding the body (hereinafter referred to as the comparative brazed body) (1), the amount of residual Zn in the upper plate 2 and the corrosion state of the lower plate 1 were measured by a salt water spray test (salt water spray for 30 days according to JIS standards). The results are shown in Table 2.
【表】
第２表に示されるように、上板２の残留Zn量
に関しては、本発明ろう付け体(1)〜(3)では、初期
Zn含有量１％が0.7〜0.9％に減少するだけなのに
対して、比較ろう付け体(1)においては、それが
0.05％に激減している。このような比較ろう付け
体における上板２のZn含有量の激減は、塩水噴
霧試験結果に明確に表われており、このような
Zn含有量の減少による犠牲陽極効果の低下によ
つて、比較ろう付け体(1)の下板１は著しく腐食し
ている。これに対して上板のZn含有量の減少が
僅かな本発明ろう付け体(1)〜(3)においては、Zn
成分によつてもたらされるすぐれた犠牲陽極効果
によつて全く腐食が発生していない。
実施例 ２
第３図に側面図で、第４図に第３図のＡ−Ａ線
視横断面図で示される組立て体において、立設対
向配置の２枚の波状ブレージング３を、厚さ0.64
mmをもち、組成：Al−1.2％Mn（AA3003材）を
もつたAl合金板（コア材）の両面に、それぞれ
厚さ0.08mmに対して第３表に示される組成をもつ
た本発明ろう材(4)〜（14）および比較ろう材(2)を
クラツドして全体厚さ0.8mmとし、その高さが40
mmをもつたもので構成し、一方上板４および下板
５をそれぞれ厚さ５mmおよび0.5mmをもつと共
に、長さ100mm、巾50mmの寸法をもつた99.0％Al
板（AA1100材）で構成し、実施例１におけると
同一の条件、すなわち本発明ろう材(4)〜（14）使
用のものには本発明ろう付け方法を、また比較ろ
う材(2)使用のものには真空ろう付け方法を適用し
て、それぞれろう付けを行つた。[Table] As shown in Table 2, regarding the amount of residual Zn in the upper plate 2, in the brazed bodies (1) to (3) of the present invention, the initial
While the Zn content of 1% only decreases to 0.7-0.9%, in the comparative brazed body (1), it decreases to 0.7-0.9%.
It has decreased sharply to 0.05%. The drastic decrease in the Zn content of the upper plate 2 in such comparative brazed bodies is clearly shown in the salt spray test results.
The lower plate 1 of the comparative brazed body (1) is severely corroded due to the decrease in the sacrificial anode effect due to the decrease in Zn content. On the other hand, in the brazed bodies (1) to (3) of the present invention in which the Zn content of the upper plate is slightly reduced, Zn
No corrosion occurs due to the excellent sacrificial anode effect provided by the components. Embodiment 2 In an assembly shown in FIG. 3 as a side view and FIG. 4 as a cross-sectional view taken along line A-A in FIG.
mm, and the composition: Al-1.2%Mn (AA3003 material) was coated on both sides of an Al alloy plate (core material) with the composition shown in Table 3 for a thickness of 0.08 mm. Materials (4) to (14) and comparative filler metal (2) were clad to a total thickness of 0.8 mm, and the height was 40 mm.
The upper plate 4 and the lower plate 5 are made of 99.0% Al having a thickness of 5 mm and 0.5 mm, respectively, and have dimensions of 100 mm in length and 50 mm in width.
The brazing method of the present invention was applied to the plate (AA1100 material) under the same conditions as in Example 1, that is, using the inventive brazing filler metals (4) to (14), and the comparative brazing filler metal (2) was used. The vacuum brazing method was applied to each of the parts.
【表】
この結果得られた本発明ろう材(4)〜（14）使用
のろう付け体においては、いずれもブレージング
シート３と上板４および下板５とのろう付けが完
全に行なわれているのに対して、比較ろう材(2)使
用のろう付け体においては、ブレージングシート
３と下板５のろう付けは良好に行なわれていた
が、ブレージングシート３と上板４とのろう付け
はろうの流れが不十分なため不完全なものであつ
た。
上述のように、この発明のフラツクスなしろう
付け方法によれば、従来真空ろう付け方法に見ら
れるような気化し易いMgやZn成分などの蒸発損
失が比較的少ないので、ろう付け製品に強度低下
や耐食性低下の発生がなく、さらにろう付け部品
の酸化皮膜除去処理を必要とすることなく、しか
も不活性ガス雰囲気の適用によつてろう付けを短
かいサイクルで行なえるなど、工業上きわめて有
用な効果をもたらされるのである。[Table] In the brazed bodies using brazing materials (4) to (14) of the present invention obtained as a result, the brazing sheet 3 and the upper plate 4 and lower plate 5 were completely brazed. In contrast, in the brazed body using comparative brazing filler metal (2), the brazing sheet 3 and the lower plate 5 were well brazed, but the brazing sheet 3 and the upper plate 4 were brazed well. It was incomplete due to insufficient flow of wax. As mentioned above, according to the flux-free brazing method of the present invention, there is relatively little evaporation loss of Mg and Zn components, which are easily vaporized, as seen in conventional vacuum brazing methods, so there is no decrease in strength of the brazed product. It is extremely useful industrially because it does not cause corrosion or corrosion resistance, does not require oxide film removal treatment on brazed parts, and can be brazed in a short cycle by applying an inert gas atmosphere. It brings about an effect.
第１図および第２図はろう付け体（試験片）の
組立て態様を示す正面図および側面図、第３図は
他の形状のろう付け体の組立て態様を示す側面
図、第４図は第３図のＡ−Ａ線視横断面図であ
る。
１，５……下板、２，４……上板、３……波状
ブレージングシート。
Figures 1 and 2 are front and side views showing how a brazed body (test piece) is assembled, Figure 3 is a side view showing how a brazed body of another shape is assembled, and Figure 4 is a side view showing how a brazed body (test piece) is assembled. FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3; 1, 5... lower plate, 2, 4... upper plate, 3... wavy brazing sheet.
Claims (1)
を、酸化皮膜を除去することなく、 Si：４〜16％、 Mg：0.2〜５％、 Zn：２〜10％、 Li，Ca，Ｋ，Na，Sr，Sb，Ba，およびBiのう
ちの１種または２種以上：0.01〜２％、 を含有し、残りがAlと不可避不純物からなる組
成（以上重量％）をもつたろう材と共にろう付け
炉内に装入し、 ついで上記ろう付け炉内に不活性ガスを導入す
ることによつて前記炉内の残留ガスをパージする
と共に、前記炉内雰囲気を露点−50℃以下、酸素
濃度5ppm以下に調整し、 このように調整した不活性ガス雰囲気下でろう
付け温度に加熱した後、真空引きを行なうことに
よつて前記ろう材中に含有する気化し易い金属の
蒸発を促して酸化皮膜を破壊しながらろう付けを
行ない、 続いて再び不活性ガスを導入して冷却を行なう
ことを特徴とするAlおよびAl合金部品のフラツ
クスなしろう付け方法。[Claims] 1 Al and Al alloy parts to be brazed can be brazed without removing the oxide film, Si: 4 to 16%, Mg: 0.2 to 5%, Zn: 2 to 10%, Li, One or more of Ca, K, Na, Sr, Sb, Ba, and Bi: 0.01 to 2%, and the remainder is Al and unavoidable impurities (wt%). Then, by introducing an inert gas into the brazing furnace, residual gas in the furnace is purged, and the atmosphere in the furnace is reduced to a dew point of -50°C or less. After adjusting the oxygen concentration to 5 ppm or less and heating it to the brazing temperature in an inert gas atmosphere adjusted in this way, a vacuum is drawn to promote the evaporation of the easily vaporized metal contained in the brazing filler metal. A flux-free brazing method for Al and Al alloy parts, characterized in that brazing is performed while destroying the oxide film, and then cooling is performed by introducing an inert gas again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3765677A JPS53123354A (en) | 1977-04-04 | 1977-04-04 | Fluxless brazing method of al and al alloy parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3765677A JPS53123354A (en) | 1977-04-04 | 1977-04-04 | Fluxless brazing method of al and al alloy parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53123354A JPS53123354A (en) | 1978-10-27 |
| JPS6119357B2 true JPS6119357B2 (en) | 1986-05-16 |
Family
ID=12503675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3765677A Granted JPS53123354A (en) | 1977-04-04 | 1977-04-04 | Fluxless brazing method of al and al alloy parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS53123354A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0039153B1 (en) * | 1980-04-29 | 1984-10-24 | Marston Palmer Ltd. | A sheet of foil, clad sheet of aluminium and method of brazing using a strontium containing brazing alloy |
| JPS59126747A (en) * | 1983-01-06 | 1984-07-21 | Furukawa Alum Co Ltd | Vacuum brazing sheet for aluminum |
| JPS59126748A (en) * | 1983-01-07 | 1984-07-21 | Furukawa Alum Co Ltd | Vacuum brazing sheet for aluminum |
| JPS6083770A (en) * | 1983-10-12 | 1985-05-13 | Sumitomo Precision Prod Co Ltd | Vacuum brazing method |
| JPS60250893A (en) * | 1984-05-25 | 1985-12-11 | Sumitomo Light Metal Ind Ltd | Aluminum alloy brazing filler metal for heat exchanger made of aluminum |
| JPS6137395A (en) * | 1984-07-31 | 1986-02-22 | Sumitomo Light Metal Ind Ltd | Aluminum alloy brazing filler metal for aluminum heat exchanger |
| US7306133B2 (en) * | 2003-04-25 | 2007-12-11 | St Assembly Test Services Ltd. | System for fabricating an integrated circuit package on a printed circuit board |
| JP5614883B2 (en) * | 2010-08-31 | 2014-10-29 | 三菱アルミニウム株式会社 | Fluxless brazing method of aluminum material, aluminum alloy brazing sheet for fluxless brazing, and aluminum alloy brazing material for fluxless brazing |
| JP2012050995A (en) * | 2010-08-31 | 2012-03-15 | Mitsubishi Alum Co Ltd | Aluminum alloy brazing material sheet for fluxless brazing and fluxless brazing method for aluminum material |
| JP6132347B2 (en) * | 2013-07-31 | 2017-05-24 | 株式会社Uacj | Aluminum alloy brazing sheet and method for producing the same |
-
1977
- 1977-04-04 JP JP3765677A patent/JPS53123354A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53123354A (en) | 1978-10-27 |
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