JPH0569118A - Method for brazing end face of thin sheet - Google Patents

Method for brazing end face of thin sheet

Info

Publication number
JPH0569118A
JPH0569118A JP25977791A JP25977791A JPH0569118A JP H0569118 A JPH0569118 A JP H0569118A JP 25977791 A JP25977791 A JP 25977791A JP 25977791 A JP25977791 A JP 25977791A JP H0569118 A JPH0569118 A JP H0569118A
Authority
JP
Japan
Prior art keywords
brazing
plate
heat exchanging
partition plate
coating
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.)
Pending
Application number
JP25977791A
Other languages
Japanese (ja)
Inventor
Yoichi Hisamori
洋一 久森
Original Assignee
Mitsubishi Electric Corp
三菱電機株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp, 三菱電機株式会社 filed Critical Mitsubishi Electric Corp
Priority to JP25977791A priority Critical patent/JPH0569118A/en
Publication of JPH0569118A publication Critical patent/JPH0569118A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the labor to coat a partition flange with brazing filler metal by flowing grains coated with granular core material between a heat exchanging element and a partition plate and obviate the need for finish precision at the side of the side of the heat exchanging element by providing air tightness by brazing on the side of the heat exchanging element. CONSTITUTION:A granular core material 20 is coated with coating material 21 having lower a melting point than that of the core material 20, a heat exchanging material 1 and a partition plate 10 to obtain coated material 22. These many coated materials 22 are piled up around the heat exchanging element 1 raised on the partition plate 10 and the heat exchanging element 1 and the partition plate 20 provided with these piled up coated material 22 are heated at temperature higher than the melting point of the coated material 22 and lower than the melting points of the core material 20, the heat exchanging element 1 and the partition plate 10. Then, the coating materials 21 are melted, and contact parts between the coating materials 22 and contact parts between the coated materials 22 the heat exchanging element 1 and the partition plate 10. Then, the coating materials 21 are melted, and contact parts between the coating materials 22 and contact parts between the coated materials 22 the heat exchanging element 1 and the partition plate 10 are welded.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】この発明は、燃焼器の空気予熱器
などの熱交換器に用いられているコルゲート板(波板状
の熱交換エレメント)と、このコルゲート板の両端面に
接合されるフランジのろう付などに代表されるような、
接合強度が余り必要でなく、かつある程度の気密(完全
の気密は必要でない)を必要とする、薄板の端面と板材
などとのろう付方法に関するものである。
BACKGROUND OF THE INVENTION This invention relates to a corrugated plate (corrugated plate-shaped heat exchange element) used in a heat exchanger such as an air preheater of a combustor, and to both end faces of the corrugated plate. As typified by flange brazing,
The present invention relates to a brazing method between an end face of a thin plate and a plate material, which requires less bonding strength and requires a certain degree of airtightness (not completely airtightness).
【0002】[0002]
【従来の技術】図5は例えば実開昭60−145257
号公報に示された従来の空気予熱器を示す断面図であ
り、図において、1は波板状の熱交換エレメント、2は
燃焼空間、3は燃焼排気ガスの流路を連通させるスリッ
ト3aが設けられた防護板、4は燃焼空気が流入する入
口管、5は排気ガスが流出する出口管である。また、図
6は図5のA−A線に沿って切断した一部拡大断面図で
あり、6は排気ガスが流れるガス側流路、7は燃焼用空
気が流れる空気側流路である。8は熱交換エレメント1
の端面と溶接またはろう付により接合され、排気ガスと
燃焼用空気が混ざらないように気密にされている仕切り
フランジa、9は熱交換エレメント1の他端を溶接また
はろう付により接合された仕切りフランジb、11は燃
焼ガス側流路7を形成させる側板a、12は空気側流路
6を形成させる側板bである。
2. Description of the Related Art FIG.
FIG. 3 is a cross-sectional view showing a conventional air preheater disclosed in Japanese Patent Publication No. JP-A-2003-264, in which 1 is a corrugated plate-shaped heat exchange element, 2 is a combustion space, and 3 is a slit 3a for communicating a flow path of combustion exhaust gas. The protective plate 4 provided is an inlet pipe through which combustion air flows in, and 5 is an outlet pipe through which exhaust gas flows out. 6 is a partially enlarged cross-sectional view taken along the line AA in FIG. 5, 6 is a gas side flow path through which exhaust gas flows, and 7 is an air side flow path through which combustion air flows. 8 is a heat exchange element 1
Partition flanges a and 9 which are joined to the end face of the heat exchange element 1 by welding or brazing and are made airtight so that exhaust gas and combustion air do not mix with each other. The flanges b and 11 are side plates a that form the combustion gas side flow passage 7, and the flange 12 is a side plate b that forms the air side flow passage 6.
【0003】次に動作について説明する。燃焼空間2で
発生した排気ガスは、スリット3aを通ってガス側流路
6を流れ、出口管5から大気に流出する。一方、入口管
4にブロワー(図示せず)によって送られてきた燃焼用
空気は、空気側流路7を流れ、その間に対向して流れる
燃焼ガスと熱交換されて暖められ、燃料と混合される。
そして、燃焼排ガスは逆に熱を奪われる。この時、空気
予熱器の持つ特性としては、熱交換性能が高く、両流体
が流れるときの圧力損失が小さい方がよい。そのために
は、両流体が混ざらないように熱交換エレメント1の端
面の気密が保たれねばならない。そのときの気密性能と
しては、熱交換エレメント1の端面部からの漏れの圧力
損失が、燃焼用空気の空気側流路を流れる時の圧力損失
の1/100程度であればよい。本実施例では、波板の熱交
換エレメントに対応した仕切りフランジ8,9を図7に
示すように溶接(Tig,Mig溶接)13で接合され
ていると思われる。また、図8のように熱交換エレメン
ト1を鏡板状の仕切り板10にろう付する場合、ろう材
14が熱交換エレメント1のガス側流路6や空気側流路
7の狭い流路に毛細管現象で14aの如く引き込まれ、
流路を詰めてしまったり、ろう材が流路6,7側に流れ
たために、熱交換エレメントを接合するろう材が不足し
て、気密ができないことが起こる。
Next, the operation will be described. The exhaust gas generated in the combustion space 2 flows through the slit 3a, the gas side flow path 6, and the outlet pipe 5 into the atmosphere. On the other hand, the combustion air sent to the inlet pipe 4 by a blower (not shown) flows through the air-side flow path 7 and is heat-exchanged with the combustion gas flowing in the opposite direction to be warmed and mixed with the fuel. It
On the contrary, the combustion exhaust gas is deprived of heat. At this time, as the characteristics of the air preheater, it is preferable that the heat exchange performance is high and the pressure loss when both fluids flow is small. For that purpose, the end face of the heat exchange element 1 must be kept airtight so that both fluids are not mixed. As the airtightness at that time, the pressure loss due to leakage from the end surface portion of the heat exchange element 1 may be about 1/100 of the pressure loss when flowing through the air side flow path of the combustion air. In this embodiment, it is considered that the partition flanges 8 and 9 corresponding to the heat exchange element of the corrugated plate are joined by welding (Tig, Mig welding) 13 as shown in FIG. Moreover, when the heat exchange element 1 is brazed to the partition plate 10 in the shape of a plate as shown in FIG. 8, the brazing filler metal 14 forms a capillary in a narrow flow passage 6 of the heat exchange element 1 or a narrow flow passage of the air side 7. It is drawn in like 14a by a phenomenon,
Since the flow passages are filled up or the brazing filler metal flows to the flow passages 6 and 7, the brazing filler metal for joining the heat exchange elements is insufficient, and airtightness cannot be achieved.
【0004】そこで、ガス側流路6や空気側流路7をろ
う材の流れ過ぎにより、流路を詰めてしまう問題を解決
するために次のような提案がなされた。即ち波板の熱交
換エレメント1の端面と仕切りフランジ8,9のろう付
にNiろうを用い、Niろうの重量に対し1%〜5%の
Ni粉末をろう付時に消失するバインダーで混ぜ合わせ
たろう材を用い、このろう材を仕切りフランジにもり、
波板の熱交換エレメント1の端面と仕切りフランジ8,
9をNiろう付温度でろう付する。
Therefore, the following proposals have been made in order to solve the problem that the brazing filler metal flows too much through the gas side flow path 6 and the air side flow path 7 to fill the flow path. That is, Ni brazing is used for brazing the end face of the heat exchange element 1 of the corrugated plate and the partition flanges 8 and 9, and 1% to 5% of Ni powder based on the weight of the Ni brazing is mixed with a binder that disappears during brazing. Using a brazing material, put this brazing material on the partition flange,
End face of heat exchange element 1 of corrugated plate and partition flange 8,
Braze 9 at Ni brazing temperature.
【0005】[0005]
【発明が解決しようとする課題】しかしこの技術では、
流路を詰めることなく、気密の信頼性を向上させること
ができたが、上記ろう材を仕切りフランジにもる手間が
多くかかり、ろう付による気密も熱交換エレメント1の
端面で行なうため、熱交換エレメント1の端面の仕上げ
精度が必要であり、この加工に時間がかかるなどの問題
点が残っていた。
However, with this technique,
Although it was possible to improve the reliability of the airtightness without clogging the flow path, it takes a lot of time and effort to put the brazing material on the partition flange, and the airtightness by brazing is also performed on the end surface of the heat exchange element 1. The finishing accuracy of the end surface of the exchange element 1 is required, and there remains a problem that this processing takes time.
【0006】この発明は上記のような問題点を解消する
ためになされたもので、ガス側流路や空気側流路をろう
材の流れ過ぎにより、流路を詰めてしまうことなく、か
つろう材を仕切りフランジにもる手間が削減でき、熱交
換エレメント端面の仕上げ精度が不要なろう付方法を得
ることを目的とする。
The present invention has been made in order to solve the above-mentioned problems, and prevents the flow path from being clogged due to excessive flow of the brazing material in the gas side flow path or the air side flow path. It is an object of the present invention to obtain a brazing method that can reduce the labor of material to be used as a partition flange and does not require finishing accuracy of the end surface of the heat exchange element.
【0007】[0007]
【課題を解決するための手段】この発明に係る薄板の端
面と板材などとのろう付方法は、粒状のコア材にメッキ
を施した粒子を、熱交換エレメントと仕切り板の間に流
し込むことにより、熱交換エレメント側面にメッキを施
した粒子を積み重ね、メッキろうのろう付温度で加熱す
ることで、メッキが融解し、メッキがろう材と同様に働
いてろう付するようにしたものである。
A brazing method for an end face of a thin plate and a plate material according to the present invention is a method for injecting heat between a heat-exchange element and a partition plate by pouring particles obtained by plating a granular core material. By stacking plated particles on the side surface of the exchange element and heating them at the brazing temperature of the brazing filler metal, the plating melts and the plating acts like a brazing filler metal for brazing.
【0008】[0008]
【作用】この発明におけるろう付方法によれば、被覆し
たメッキが溶融してろう材と同様の働きをし、熱交換エ
レメントと仕切り板の間に、粒子の多孔質体を形成し、
熱交換エレメント側面部に多孔質体が接合するので、熱
交換エレメントと仕切り板の間からの漏れを小さくでき
る(この部分の圧力損失を非常に大きくできる)。ま
た、ろう材として働くのはメッキ部分の薄膜なので、ガ
ス側流路や空気側流路をろう材の流れ過ぎにより、流路
を詰めてしまうことなく、かつろう材を仕切りフランジ
にもる手間が削減でき、ろう付による気密も熱交換エレ
メント側面で行なうため、熱交換エレメント端面の仕上
げ精度が不要となるので、接合に要する準備時間を著し
く削減できる。
According to the brazing method of the present invention, the coated plating melts and acts like a brazing filler metal, forming a porous body of particles between the heat exchange element and the partition plate.
Since the porous body is joined to the side surface of the heat exchange element, the leakage between the heat exchange element and the partition plate can be made small (the pressure loss in this portion can be made very large). In addition, since the thin film of the plated portion acts as a brazing filler metal, the brazing filler metal does not clog the gas side flow passage and the air side flow passage due to excessive flow of the brazing filler metal, and the brazing filler metal can be used as a partition flange. Since the airtightness by brazing is also performed on the side surface of the heat exchange element, the finishing accuracy of the end surface of the heat exchange element is not required, and the preparation time required for joining can be significantly reduced.
【0009】[0009]
【実施例】【Example】
実施例1.以下この発明の一実施例を図について説明す
る。図1〜図3において、1は波板状の熱交換エレメン
ト、10はこの熱交換エレメント1と接合される鏡板状
の仕切り板であり、22は粒径100(μm)程度のス
テンレス粉のコア材20に、10(μm)程度のNiメ
ッキを施した被覆材21からなる被覆処理材で、仕切り
板10と熱交換エレメント1の隙間に多数充填されてい
る。
Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, 1 is a corrugated plate-shaped heat exchange element, 10 is a mirror plate-shaped partition plate joined to the heat exchange element 1, and 22 is a core of stainless powder having a particle diameter of about 100 (μm). A large number of gaps between the partition plate 10 and the heat exchange element 1 are filled with a covering material made of a covering material 21 obtained by plating the material 20 with Ni (about 10 μm).
【0010】次にそのろう付方法について図2を用いて
説明する。図2は本発明のろう付部の断面側面を拡大し
たものであり、本実施例では、粒径10〜100(μ
m)のステンレス粒子をコア材20として使用し、無電
解Niメッキ(ニッケル:87〜93%、りん:4〜1
2%、その他1%)溶液中で90℃、40分のメッキ処
理を行ない、コア材20に被覆材21となるNiメッキ
膜を形成して、ステンレス粒子に10(μm)程度のN
iメッキ膜を持った被覆処理材22を得る。材料の融点
が被覆材21より高い熱交換エレメント1(本実施例で
はステンレス材)を、同材料からなり熱交換エレメント
1が入る溝が形成された仕切り板10にはめ込み、仕切
り板10と熱交換エレメント1の隙間に多数の被覆処理
材22を流し込んで充填する(図2A)。このように被
覆処理材22を充填した後に、仕切り板10に振動を与
え、被覆処理材22の粒子が均等に積み重なるように
し、この状態で、真空(10−3Torr程度)の雰囲気の
ろう付炉の中に入れ、950℃で30分加熱する。この
加熱処理により、Niメッキの被覆材21は融解して、
表面張力、ぬれ性などにより互いに引き集まり、ろう材
として働き、仕切り板10と熱交換エレメント1をコア
材20を介して接合する。そして余った被覆材21が、
コア材20間の隙間に浸透していき、ボイド23の少な
い接合部を形成する。(図2B)。
Next, the brazing method will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional side view of the brazing part of the present invention. In the present embodiment, the particle size is 10 to 100 (μ
m) stainless particles are used as the core material 20, and electroless Ni plating (nickel: 87-93%, phosphorus: 4-1) is used.
(2%, other 1%) plating at 90 ° C. for 40 minutes in a solution to form a Ni plating film serving as the coating material 21 on the core material 20, and to the stainless steel particles about 10 (μm) N
A coating material 22 having an i-plated film is obtained. The heat exchange element 1 (stainless steel material in this embodiment) whose melting point is higher than that of the coating material 21 is fitted into the partition plate 10 made of the same material and provided with the groove into which the heat exchange element 1 is inserted, and heat exchange with the partition plate 10 is performed. A large number of coating treatment materials 22 are poured and filled in the gaps of the element 1 (FIG. 2A). After filling the coating material 22 in this way, the partition plate 10 is vibrated so that the particles of the coating material 22 are evenly stacked, and in this state, brazing in a vacuum (about 10 −3 Torr) atmosphere is performed. Place in furnace and heat at 950 ° C. for 30 minutes. By this heat treatment, the Ni-plated covering material 21 is melted,
The partition plates 10 and the heat exchange element 1 are joined together via the core material 20 by attracting each other due to surface tension, wettability, and the like, and acting as a brazing material. And the remaining covering material 21
It penetrates into the gaps between the core materials 20 and forms a joint with few voids 23. (FIG. 2B).
【0011】これにより、図3に示すように、熱交換エ
レメント1を仕切り板10にはめ込んだ時、隙間Δhが
発生していても熱交換エレメント1の側面と仕切り板1
0の上面にコア材20を介して、加熱処理により融解し
た被覆材21で接合されるため、ある程度の気密を得る
ことができる。
Thus, as shown in FIG. 3, when the heat exchange element 1 is fitted into the partition plate 10, even if a gap Δh is generated, the side surface of the heat exchange element 1 and the partition plate 1 are separated.
Since it is joined to the upper surface of 0 through the core material 20 with the covering material 21 melted by the heat treatment, a certain degree of airtightness can be obtained.
【0012】実施例2.図2に示した方法では、コア材
20の粒径を100(μm)の1種類としたが、図4に
示すように粒径の異なるコア材を用いてもよい。即ち1
00、50、10(μm)の粒径を持つ数種のコア材2
0に、それぞれの粒径の10%ほどの厚みになるよう
に、被覆材21となるNiメッキを施し、被覆処理材2
2としたものを、適当な割合で混合し、それを仕切り板
10と熱交換エレメント1の隙間に流し込んで充填し、
前述の熱処理と同様な方法により接合を行なう。この場
合、大きい粒径の粒子の間に小さな粒子が入り込むため
の、接合後ボイド23の少ない接合部を得ることができ
る。
Example 2. In the method shown in FIG. 2, the particle size of the core material 20 is 100 (μm), but as shown in FIG. 4, core materials having different particle sizes may be used. Ie 1
Several kinds of core materials 2 having a particle size of 00, 50, 10 (μm) 2
0 is Ni-plated so that the coating material 21 has a thickness of about 10% of each particle diameter.
2 is mixed at an appropriate ratio, poured into the gap between the partition plate 10 and the heat exchange element 1 to be filled,
Bonding is performed by the same method as the heat treatment described above. In this case, it is possible to obtain a bonded portion with few voids 23 after bonding because small particles enter between particles of large particle size.
【0013】また上記実施例では、コア材20と仕切り
板10と熱交換エレメント1の材料にステンレスを使用
したが、銅、ニッケル、ベリリウム銅などの金属、ある
いはガラスなどの無機物質、あるいはスチレンなどのポ
リマーでもよく、被覆材21も本例では、Niメッキと
したが、銀、銀ろう、アルミ半田などの半田材でも同様
である。
In the above embodiment, stainless steel was used as the material for the core material 20, the partition plate 10 and the heat exchange element 1. However, metals such as copper, nickel and beryllium copper, inorganic materials such as glass, styrene, etc. In this example, the coating material 21 is Ni-plated, but the same applies to a solder material such as silver, silver solder, or aluminum solder.
【0014】[0014]
【発明の効果】以上のように、この発明によれば、ガス
側流路や空気側流路をろう材の流れ過ぎにより、流路を
詰めてしまうことなく、かつろう材を仕切りフランジに
もる手間が削減でき、ろう付による気密も熱交換エレメ
ント側面で行なうため、熱交換エレメント端面の仕上げ
精度を不要にできるなどのすぐれた効果がある。
As described above, according to the present invention, the brazing filler metal can be applied to the partition flange without filling the flow passage due to the excessive flow of the brazing filler metal in the gas side flow passage and the air side flow passage. Since it is possible to reduce the labor and the airtightness by brazing is performed on the side surface of the heat exchange element, there is an excellent effect that the finishing accuracy of the end surface of the heat exchange element is unnecessary.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明の一実施例による薄板の端面ろう付方法
を示す斜面図である。
FIG. 1 is a perspective view showing a method of brazing an end face of a thin plate according to an embodiment of the present invention.
【図2】本発明の一実施例による薄板の端面ろう付方法
の工程図(A)(B)である。
FIG. 2 is a process diagram (A) (B) of a method for brazing an end face of a thin plate according to an embodiment of the present invention.
【図3】本発明の一実施例による薄板の端面ろう付方法
を示す側面図である。
FIG. 3 is a side view showing a method of brazing an end face of a thin plate according to an embodiment of the present invention.
【図4】本発明の他の実施例を示す断面図である。FIG. 4 is a sectional view showing another embodiment of the present invention.
【図5】薄板の端面ろう付が使用されている空気予熱器
を示す断面図である。
FIG. 5 is a sectional view showing an air preheater in which end face brazing of a thin plate is used.
【図6】空気予熱器の流路部の拡大断面図である。FIG. 6 is an enlarged cross-sectional view of a flow path portion of the air preheater.
【図7】従来の溶接による接合方法を示す断面側面図で
ある。
FIG. 7 is a sectional side view showing a conventional joining method by welding.
【図8】従来のろう付による接合方法を示す断面側面図
である。
FIG. 8 is a cross-sectional side view showing a conventional joining method by brazing.
【符号の説明】[Explanation of symbols]
1 熱交換エレメント 10 仕切り板 20 コア材 21 被覆材 22 被覆処理材 1 Heat Exchange Element 10 Partition Plate 20 Core Material 21 Covering Material 22 Covering Material

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 薄板端面と板材などの側面の接合におい
    て、粒状のコア材に、このコア材および上記薄板材と板
    材より融点の低い被覆材を成膜して被覆処理材を得、こ
    の多数の被覆処理材を、板材に立てた薄板材の周りに積
    み重ね、この積み重ねた被覆処理材を有する薄板材と板
    材を、上記被覆材の融点より高く、かつコア材および上
    記薄板材と板材の融点より低い温度で加熱して、上記被
    覆材を溶融し、被覆処理材相互間及び被覆処理材と薄板
    及び板材間の接触部とを融着させることによりろう付す
    ることを特徴とする薄板の端面ろう付方法。
    1. When a thin plate end face is joined to a side face such as a plate material, a coating material having a melting point lower than that of the core material and the thin plate material and the plate material is formed on a granular core material to obtain a coating treatment material. The coating material of (1) is stacked around a thin plate material that has been erected on a plate material, and the thin plate material and the plate material having the stacked coating material are higher than the melting point of the coating material, and the melting point of the core material and the thin plate material and the plate material. An end face of a thin plate characterized by being brazed by heating at a lower temperature to melt the coating material, and by fusing the coating treatment materials and the contact portions between the coating treatment material and the thin plate and the plate material. Brazing method.
  2. 【請求項2】 コア材の粒径を数種類変えて成膜した、
    粒径の違う被覆処理材を混合して用いたことを特徴とす
    る請求項1記載の薄板の端面ろう付方法。
    2. The film is formed by changing the particle size of the core material to several types.
    The method for brazing an end surface of a thin plate according to claim 1, wherein coating treatment materials having different particle sizes are mixed and used.
JP25977791A 1991-09-10 1991-09-10 Method for brazing end face of thin sheet Pending JPH0569118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25977791A JPH0569118A (en) 1991-09-10 1991-09-10 Method for brazing end face of thin sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25977791A JPH0569118A (en) 1991-09-10 1991-09-10 Method for brazing end face of thin sheet

Publications (1)

Publication Number Publication Date
JPH0569118A true JPH0569118A (en) 1993-03-23

Family

ID=17338833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25977791A Pending JPH0569118A (en) 1991-09-10 1991-09-10 Method for brazing end face of thin sheet

Country Status (1)

Country Link
JP (1) JPH0569118A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009500523A (en) * 2005-07-07 2009-01-08 オネラ(オフィス・ナショナル・ドゥエチュード・エ・ドゥ・ルシェルチェ・アエロスパシャル) Method for producing hollow metal body and hollow metal body obtainable thereby

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009500523A (en) * 2005-07-07 2009-01-08 オネラ(オフィス・ナショナル・ドゥエチュード・エ・ドゥ・ルシェルチェ・アエロスパシャル) Method for producing hollow metal body and hollow metal body obtainable thereby

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