JPH0255664A - Production of heat exchanger - Google Patents
Production of heat exchangerInfo
- Publication number
- JPH0255664A JPH0255664A JP20531788A JP20531788A JPH0255664A JP H0255664 A JPH0255664 A JP H0255664A JP 20531788 A JP20531788 A JP 20531788A JP 20531788 A JP20531788 A JP 20531788A JP H0255664 A JPH0255664 A JP H0255664A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- joints
- pipe
- extruded
- brazed
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000005219 brazing Methods 0.000 claims abstract description 20
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 13
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 10
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 229910021364 Al-Si alloy Inorganic materials 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 230000007797 corrosion Effects 0.000 abstract description 22
- 238000005260 corrosion Methods 0.000 abstract description 22
- 239000002184 metal Substances 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 4
- 239000000945 filler Substances 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 2
- 239000010953 base metal Substances 0.000 abstract 2
- 239000012299 nitrogen atmosphere Substances 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000007751 thermal spraying Methods 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001007 puffing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はＡｌまたはＡｌ合金からなる熱交換器のａ漬方
法に関し、熱交換器特にコンデンサーの耐食性を向上さ
せたものでおる。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for soaking a heat exchanger made of Al or an Al alloy, and improves the corrosion resistance of the heat exchanger, particularly a condenser.
一般に熱交換器としてのコンデンサーは自動車のエアコ
ン等に用いられているが、該エアコンは第１図に示すよ
うにコンデンサー（１）、リキッドタンク（２）、エバ
ポレーター（３）及びコンプレッサー（４）等を配管（
５）で連結して閉回路を形成し、内部に熱媒体を封入し
たもので、エンジン（６）の回転力を利用してコンプレ
ッサー（４）を駆動し、熱媒体をコンデンサー（１）で
凝縮させて熱を放出し、次に液化した熱媒体をエバポレ
ーター（３）で膨張させて熱を吸収し、さらにガス化し
た熱媒体を再びコンデンサー（１）に送る動きを繰り返
して行うものである。Condensers as heat exchangers are generally used in automobile air conditioners, etc., and as shown in Figure 1, these air conditioners consist of a condenser (1), a liquid tank (2), an evaporator (3), a compressor (4), etc. Plumbing (
5) to form a closed circuit, and a heat medium is sealed inside.The rotational force of the engine (6) is used to drive the compressor (4), and the heat medium is condensed in the condenser (1). The liquefied heat medium is then expanded in the evaporator (3) to absorb the heat, and the gasified heat medium is then sent to the condenser (1) again.
上記コンデンサー（１）として例えば押出偏平多穴管を
用いたサーペンタイン型コンデンサーでは押出管にＪＩ
Ｓ １０５０ （Ａ １９９．５０ ｗｔ％以上）。For example, in a serpentine type condenser using an extruded flat multi-hole tube as the condenser (1), the extruded tube has JI
S 1050 (A 199.50 wt% or more).
ＪＩＳ ３００３合金（Ａ １−０．０５〜０．２０ｗ
ｔ％ＣＬＪ−１，０〜１．５ ｖｔ％Ｍｎ）または／Ｍ
！−Ｃｕ系合金等を使用し、その肉厚は０．８６１１１
程度であり、管の寸法は厚さが５ｍ、幅が２２ｓ程度の
ものを用いている。またフィン材としてはＡｌ−Ｓｉ系
合金であるＪＩＳ ４３４３合金（Ａｊ！−６，８〜８
．２ｗｔ％Ｓｉ）またはＪＩＳ ４０４５合金（／Ｍ！
−９，０〜１１ 、０ｗｔ％Ｓｉ）をろう材とし、該ろ
う材をＪＩＳ３００３合金に１〜２ｗｔ％程度のＺｎを
添加した芯材の両面に片面当たり１０％程度のクラツド
率で貼り合わせた板厚０．１６７１！１ｍ程度のプレー
ジングシートを用いている。JIS 3003 alloy (A 1-0.05~0.20w
t%CLJ-1.0~1.5 vt%Mn) or /M
! -Uses Cu-based alloy, etc., and its wall thickness is 0.86111
The dimensions of the tube used are approximately 5 m thick and 22 s wide. In addition, as a fin material, JIS 4343 alloy (Aj!-6, 8 to 8
．． 2wt%Si) or JIS 4045 alloy (/M!
-9,0~11,0wt%Si) was used as a brazing material, and the brazing metal was bonded to both sides of a core material made of JIS3003 alloy with about 1 to 2wt% of Zn added at a cladding ratio of about 10% per side. A plating sheet with a thickness of about 0.1671!1m is used.
これら押出管とフィン材とを用いてコンデンサーを作製
するには、押出管を蛇行状に成形し、その間にコルゲー
ト加工したフィン材を挟み、ざらに押出管の両端には押
出管と第１図に示す配管（５）とを連結するためのユニ
オンやナツト等を組み付け、フッ化物系のフラックスを
塗布した侵、陣雰囲気中で６００℃に加熱して押出管と
フィン材及び押出管とユニオンをろう付けにより一体コ
アに接合している。なお第２図に示すように、押出管〔
８）両端にユニオン（９）を接合する場合は両者の接合
部にワイヤー状のろう材をいわゆる置きろう（７）とし
て使用する。なお（１１）はフィンを示す。In order to manufacture a capacitor using these extruded tubes and fin materials, the extruded tube is formed into a meandering shape, a corrugated fin material is sandwiched between the extruded tubes, and the extruded tubes and fin materials are roughly attached to both ends of the extruded tube. Assemble unions, nuts, etc. for connecting with piping (5) shown in Figure 1, and heat the extruded tube and fin material and the extruded tube and union together by heating to 600°C in an immersion atmosphere coated with fluoride flux. It is joined to the integral core by brazing. Furthermore, as shown in Fig. 2, the extruded tube [
8) When joining unions (9) to both ends, a wire-shaped brazing material is used as a brazing material (7) at the joint between the two ends. Note that (11) indicates a fin.
このようにして得られたコンデンサーは自動車の前面グ
リル部（即ちラジェターの前方）の位置に装着されるた
め地域によっては塩害による腐食の問題が大きい。この
ため上記フッ化物系フラックスを使用したろう付けにお
いてはｚｎを添加したフィン材の犠牲陽極作用だけでは
押出管のすべての部分の防食を図ることは不可能であっ
た。Since the capacitors obtained in this manner are installed in the front grille of an automobile (that is, in front of the radiator), there is a serious problem of corrosion due to salt damage depending on the region. For this reason, in brazing using the above-mentioned fluoride flux, it is impossible to protect all parts of the extruded tube from corrosion only by the sacrificial anode action of the fin material added with ZN.
そこで従来はろう付は前に押出管にジンケート処理を施
してＺｎを押出管表面に析出させ、または押出管にｚｎ
溶射等により表面にｚｎを付着させた侵、ろう付は加熱
によって押出管表面にＺｎ拡散層を形成して、押出管全
範囲にわたっての耐孔食性を向上させる対策がとられて
いる。Conventionally, before brazing, the extruded tube was subjected to zincate treatment to precipitate Zn on the extruded tube surface, or the extruded tube was
In corrosion and brazing, Zn is attached to the surface by thermal spraying or the like, and a Zn diffusion layer is formed on the surface of the extruded tube by heating, thereby improving pitting corrosion resistance over the entire range of the extruded tube.
しかし上記のようなＺｎまたはＺｎ合金層を外表面に設
けた押出管を使用して配管継手類をろう付けしたコンデ
ンサーにおいてはろう付は接合部が優先的に腐食する傾
向がおり、コンデンサーの耐食寿命を著しく劣化させる
場合があった。However, in condensers that use extruded pipes with a Zn or Zn alloy layer on the outer surface and braze the piping joints as described above, brazing tends to preferentially corrode the joints, and the corrosion resistance of the condenser is There were cases where the lifespan was significantly reduced.
これは第３図に示すようにユニオン（９）と押出管（８
）との接合部でＺｎ層を有する押出管（８）の表面とフ
ィレット（１０）を形成したろう材との電位差により、
ろう材との界面で押出管（８）のＺｎ拡散部分（１２）
が優先腐食するため圧洩れに至るものである。なお（１
３）は優先腐食部分を示す。This consists of a union (9) and an extruded tube (8) as shown in Figure 3.
) Due to the potential difference between the surface of the extruded tube (8) having a Zn layer and the fillet (10) forming the fillet,
Zn diffusion part (12) of the extruded tube (8) at the interface with the brazing material
is preferentially corroded, leading to pressure leaks. Furthermore, (1
3) indicates a preferentially corroded area.
（課題を解決するための手段）
本発明はこれに鑑み種々検討した結果、表面にｚｎ合金
等の層を有する押出管と配管継手類との接合８Ｎでろう
材と押出管の接合界面に表面ｚｎ濃度０．５ｗｔ％以上
のＺｎ拡散層が存在するとろう付は部の優先腐蝕が顕著
になることを知見し、ざらに検討の結果ｚｎ合金等の層
を表面に有する押出管を使用したコンデンサーの耐食寿
命を向上させた熱交換器の製造方法を開発したものであ
る。(Means for Solving the Problems) The present invention has been developed based on various studies in view of the above, and it has been found that the surface of the joint interface between the brazing filler metal and the extruded pipe is It was discovered that the presence of a Zn diffusion layer with a Zn concentration of 0.5 wt% or more causes significant preferential corrosion of the brazed parts, and after a rough study, a capacitor using an extruded tube with a layer of Zn alloy etc. on the surface was found. We have developed a method for manufacturing heat exchangers that improves the corrosion-resistant lifespan of heat exchangers.
即ち本発明はｚｎまたはＺｎ合金層を外表面に設けたＡ
ｌまたはＡｌ合金押出管を蛇行状に成形し、その間にコ
ルゲート加工したフィンを挟着し、該押出管の両端に外
部配管と連結するＡｌ合金継手をＡｌ−５ｔ系合金ろう
材によりろう付けして熱交換器を製造する方法において
、押出管両端のＡｌ合金継手接合部のＺｎまたはＺｎ合
金層を除去した後、Ａｌ合金継手をろう付けすることを
特徴とするものである。That is, the present invention provides A with a Zn or Zn alloy layer on the outer surface.
A l or Al alloy extruded pipe is formed into a serpentine shape, a corrugated fin is sandwiched between them, and an Al alloy joint connecting to external piping is brazed to both ends of the extruded pipe with an Al-5t alloy brazing filler metal. The method for manufacturing a heat exchanger is characterized in that after removing the Zn or Zn alloy layer at the joints of the Al alloy joints at both ends of the extruded tube, the Al alloy joints are brazed.
（作 用）
このように押出管両端のへ１合金層手接合部のｚｎまた
はＺｎ合金層を除去するのは、ろう付は部の優先腐蝕が
大幅に軽減されるからである。この理由は、押出管の両
端の接合部以外の部分はろう付は後に表面７０ｍ度が１
〜４ｗｔ％となると優れた耐孔食性をしめすが、接合部
ではこのように表面Ｚｎ濃度が大きくなるとろう材との
電位差が大きくなり過ぎて優先腐食の問題が生ずること
になる。(Function) The reason why the Zn or Zn alloy layer at the joints of the first alloy layer at both ends of the extruded tube is removed in this manner is that preferential corrosion at the brazed portion is significantly reduced. The reason for this is that the parts other than the joints at both ends of the extruded pipe are brazed after the surface 70 m degree is 1
At ~4 wt%, excellent pitting corrosion resistance is exhibited, but when the surface Zn concentration increases in this way at the joint, the potential difference with the brazing metal becomes too large, resulting in the problem of preferential corrosion.
一方押出管とフィンとの接合部ではフィン材の芯材に添
加されたＺｎによりフィン材は卑となり、またろう材部
弁は芯材や押出管からのＺｎ拡散により卑となるために
フィン、ろう付は部の優先腐蝕によるフィン脱落の問題
はない。On the other hand, at the joint between the extruded pipe and the fin, the fin material becomes base due to Zn added to the core material of the fin material, and the filler metal valve becomes base due to Zn diffusion from the core material and extruded pipe, so the fin With brazing, there is no problem of fins falling off due to preferential corrosion.
なお本発明で用いるＺｎ除去法としては、次のような方
法がある。Note that the Zn removal method used in the present invention includes the following methods.
■ジンケート処理の場合、押出管両端部をゴムキャップ
等で被覆してｚｎの析出を防止する。■In the case of zincate treatment, cover both ends of the extruded tube with rubber caps or the like to prevent the precipitation of ZN.
■ｚｎ溶射の場合、しごき加工で両端部のｚｎ層を削り
取る。■In the case of ZN thermal spraying, the ZN layer at both ends is scraped off by ironing.
■ｚｎ溶射の場合、ミーリング、パフ、サンドベーパー
等でＺｎ層を削り取る。■In the case of Zn thermal spraying, the Zn layer is scraped off using milling, puffing, sand vapor, etc.
■上記いずれの場合も化学薬品でｚｎを溶解させる。こ
の場合硝酸が良い。■In any of the above cases, zn is dissolved with chemicals. In this case, nitric acid is good.
次に本発明の実施例について説明する。 Next, examples of the present invention will be described.
第２図に示すように、表面に２０ｇ／ｍのＺｎを溶射し
たＪＩＳ ３００３合金からなる押出多穴管（８）の両
端部をＪＩＳ ７ＮＯ１合金（／Ｍ！−０，２０〜０．
７ｗｔ％Ｍ ｎ−１，０〜２．Ｏｗｔ％Ｍｇ−４，０〜
ｓ、ｏｗｔ％Ｚｎ）からなるユニオン（９）の開口部に
挿入し、置きろう（７）としてＪＩＳ ４０４５合金か
らなる線径１．６ｍのワイヤーろうを押出管を一周する
ようにリング状にして、ユニオンに密接させた。このと
き本発明法に係るものは上記ｚｎを溶射した押出多穴管
の両端部を１：１硝酸溶液に２０分間浸漬してＺｎ除去
をおこなったが、一方従来法に係るものはＺｎ除去を行
わなかった。As shown in FIG. 2, both ends of an extruded multi-hole tube (8) made of JIS 3003 alloy whose surface is thermally sprayed with 20 g/m of Zn are coated with JIS 7NO1 alloy (/M!-0,20~0.
7wt%M n-1,0-2. Owt%Mg-4,0~
Insert into the opening of the union (9) made of s, owt% Zn), and place a wire braze (7) made of JIS 4045 alloy with a wire diameter of 1.6 m in a ring shape so as to go around the extruded tube. , brought into close contact with the Union. At this time, the method according to the present invention removed Zn by immersing both ends of the extruded multi-hole tube sprayed with Zn in a 1:1 nitric acid solution for 20 minutes, whereas the method according to the conventional method removed Zn. I didn't do it.
その後置きろうの部分にフッ化物系フラックスを５％濃
度で塗布し、２００℃で水分を蒸発させたのち、Ｎ雰囲
気中にて６００℃で１ｏ ｍｉｎのろう付は加熱を行っ
て継手を取りつけた。After that, fluoride flux was applied at a concentration of 5% to the brazing area, and after evaporating the moisture at 200℃, the joint was attached by heating for 1o min of brazing at 600℃ in a N atmosphere. .
これらのろう付継手を７２０ ｈｒキャス試験に供して
押出管表面とろう付部との腐食発生状況を調査した。These brazed joints were subjected to a 720 hr Cath test to investigate the occurrence of corrosion between the extruded tube surface and the brazed portion.
その結果、いずれのろう付継手もろう件部以外の押出管
表面には０．１５＃１Ｉ１１程度の面食が発生したにと
どまり優れた耐蝕性が確認され、さらに本発明法に係る
ろう付部では表面のみの腐食であった。一方、従来法に
係るろう付継手はろう付部が深くまで優先腐食しており
、第３図に示すように継手の内部と外部が貫通していた
。As a result, it was confirmed that all of the brazed joints exhibited excellent corrosion resistance, with only about 0.15#1I11 surface corrosion occurring on the extruded tube surface other than the brazed part. The corrosion was only on the surface. On the other hand, in the brazed joint according to the conventional method, the brazed portion was preferentially corroded to a deep depth, and as shown in FIG. 3, the inside and outside of the joint were penetrated.
（発明の効果）
このように本発明によればｚｎま、たはＺｎ合金層を表
面に形成した押出管を使用して製造するコンデンサーに
おいて、押出管と該押出管に取りつける配管継手類との
ろう付部の耐食性が向上するのでコンデンサーの耐食寿
命を著しく改善する等顕著な効果を奏するものである。(Effects of the Invention) According to the present invention, in a capacitor manufactured using an extruded tube with a Zn or Zn alloy layer formed on the surface, the connection between the extruded tube and the piping fittings attached to the extruded tube is improved. Since the corrosion resistance of the brazed portion is improved, the corrosion resistance life of the capacitor is significantly improved, and other remarkable effects are achieved.
第１図はエアコンの構成を示す回路図、第２図はコンデ
ンサーの端部を示す斜視図、第３図はユニオン取付部の
腐食状況を示す断面図である。
１・・・・・・・・コンデンサー
２・・・・・・・・リキッドタンク
３・・・・・・・・エバポレーター
４・・・・・・・・コンプレッサー
５・・・・・・・・配管
６・・・・・・・・エンジン
７・・・・・・・・置きろう
８・・・・・・・・押出管
９・・・・・・・・ユニオン
１０・・・・・・・・フィレット
１１・・・・・・・・フィン
１２・・・・・・・・ｚｎ拡散部分
１３・・・・・・・・優先腐食部分
第
図
鳳
第２図
第３図Fig. 1 is a circuit diagram showing the configuration of the air conditioner, Fig. 2 is a perspective view showing the end of the condenser, and Fig. 3 is a sectional view showing the state of corrosion of the union attachment part. 1... Condenser 2... Liquid tank 3... Evaporator 4... Compressor 5... Piping 6... Engine 7... Placement 8... Extruded pipe 9... Union 10... ...Fillet 11...Fin 12...Zn diffusion part 13...Priority corrosion part Fig. Otori Fig. 2 Fig. 3
Claims (1)
はＡｌ合金押出管を蛇行状に成形し、その間にコルゲー
ト加工したフィンを挟着し、該押出管の両端に外部配管
と連結するＡｌ合金継手をＡｌ−Ｓｉ系合金ろう材によ
りろう付けして熱交換器を製造する方法において、押出
管両端のＡｌ合金継手接合部のＺｎまたはＺｎ合金層を
除去した後、Ａｌ合金継手をろう付けすることを特徴と
する熱交換器の製造方法。(1) An Al or Al alloy extruded tube with a Zn or Zn alloy layer on the outer surface is formed into a serpentine shape, corrugated fins are sandwiched between the two, and the Al or Al alloy extruded tube is connected to external piping at both ends of the extruded tube. In a method of manufacturing a heat exchanger by brazing alloy joints with an Al-Si alloy brazing material, after removing the Zn or Zn alloy layer at the joints of the Al alloy joints at both ends of the extruded pipe, the Al alloy joints are brazed. A method for manufacturing a heat exchanger, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20531788A JPH0240422B2 (en) | 1988-08-18 | 1988-08-18 | NETSUKOKANKINOSEIZOHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20531788A JPH0240422B2 (en) | 1988-08-18 | 1988-08-18 | NETSUKOKANKINOSEIZOHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0255664A true JPH0255664A (en) | 1990-02-26 |
| JPH0240422B2 JPH0240422B2 (en) | 1990-09-11 |
Family
ID=16504948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20531788A Expired - Lifetime JPH0240422B2 (en) | 1988-08-18 | 1988-08-18 | NETSUKOKANKINOSEIZOHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0240422B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004044258A1 (en) * | 2002-11-12 | 2004-05-27 | Showa Denko K.K. | Aluminum pipe and process for producing same |
| JP2004176178A (en) * | 2002-11-12 | 2004-06-24 | Showa Denko Kk | Aluminum pipe and method for manufacturing the same |
| JP2006226613A (en) * | 2005-02-17 | 2006-08-31 | Shinko Alcoa Yuso Kizai Kk | Flat tube for heat exchanger |
| JP2014020704A (en) * | 2012-07-20 | 2014-02-03 | Panasonic Corp | Bonded body of pipe members and heat exchanger for refrigeration cycle device |
| WO2014076949A1 (en) * | 2012-11-14 | 2014-05-22 | パナソニック株式会社 | Al alloy pipe assembly and heat exchanger using same |
-
1988
- 1988-08-18 JP JP20531788A patent/JPH0240422B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004044258A1 (en) * | 2002-11-12 | 2004-05-27 | Showa Denko K.K. | Aluminum pipe and process for producing same |
| JP2004176178A (en) * | 2002-11-12 | 2004-06-24 | Showa Denko Kk | Aluminum pipe and method for manufacturing the same |
| JP2006226613A (en) * | 2005-02-17 | 2006-08-31 | Shinko Alcoa Yuso Kizai Kk | Flat tube for heat exchanger |
| JP2014020704A (en) * | 2012-07-20 | 2014-02-03 | Panasonic Corp | Bonded body of pipe members and heat exchanger for refrigeration cycle device |
| WO2014076949A1 (en) * | 2012-11-14 | 2014-05-22 | パナソニック株式会社 | Al alloy pipe assembly and heat exchanger using same |
| CN104768690A (en) * | 2012-11-14 | 2015-07-08 | 松下电器产业株式会社 | Al alloy pipe assembly and heat exchanger using same |
| JPWO2014076949A1 (en) * | 2012-11-14 | 2017-01-05 | パナソニック株式会社 | Al alloy pipe joined body and heat exchanger using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0240422B2 (en) | 1990-09-11 |
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