JPS60162744A - Multihole tube for aluminum heat exchanger and its production - Google Patents

Abstract

PURPOSE:To braze extremely thinfilms to multihole tube without buckling the fines in the stage of manufacturing an Al heat exchanger by coating double an Al-Si-Mg brazing material on the surface of the multihole tube formed by extrusion of an Al alloy. CONSTITUTION:A flat-shaped extruded multihole tube 1 having plural holes 1a in the longitudinal direction is manufactured of an Al alloy having >=630 deg.C m.p. in the stage of producing an Al heat exchanger. The tube is bent zigzag and corrugated fins 2 made of thin Al sheets are brazed between the same thus manufacturing the heat exchanger. The tube 1 in this case is dipped for <=1min in total in an Al alloy bath contg. 6-13% Si, 0.4-3% Mg or contg. further <0.2% Bi or <3% Zn and having 610-630 deg.C m.p. and an Al alloy bath having the m.p. lower by >=10 deg.C than said m.p. and contg. 9-13% Si and 0.4-3% Mg to form double plating layers 3 having 30-80mum thickness by which a brazing material is formed. Brazing of the fins 2 as thin as 0.13mm. are brazed without buckling by using such brazing material.

Description

【発明の詳細な説明】 本発明はろう付は法により組立てるアルミ製熱交換器の
多穴チューブとその製造法に関するもので、特に熱交換
器の軽量化及びコストダウンを可能に１−ると共に、チ
ューブの耐食性を向上させるｂのＣある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-hole tube for an aluminum heat exchanger that is assembled using a brazing method and a method for manufacturing the same. , C of b improves the corrosion resistance of the tube.

アルミ製熱交換器、例えばカークーラー用のコンデンサ
ーやエバポレーター等には、第１図に示すように複数個
の穴（１ａ）を長手方向に設けた偏平状の押出多穴チュ
ーブ（１）を第２図に示ｆように蛇行状に曲げ加工し、
チューブ（１）間にプレージングシートからなるコルグ
ー１−状フイン（２）を組込み、主として真空ろう付は
法により接合した熱交換器コアーが用いられている。For aluminum heat exchangers, such as condensers and evaporators for car coolers, a flat extruded multi-hole tube (1) with a plurality of holes (1a) in the longitudinal direction is used as shown in Figure 1. Bending it into a meandering shape as shown in Figure 2 f,
A heat exchanger core is used in which Korgu 1-shaped fins (2) made of plating sheets are incorporated between tubes (1) and joined mainly by vacuum brazing.

従来押出多穴チューブにはＡ、ｅｌＩｉ度９９．５ｗｔ
％（以下ｗｔ％を単に％と略記）は上のＪ１３１０５０
、Ａ、９−０．１５％ＣｕのＪＩＳＩｌｏｏ、Ａ　、ｅ
−０，１５％Ｃｕ−１，１％ＭｎのＪＩＳ３００３、Ａ
　、２−　ｉ、ｉ％ＭｎのＪｉ３３２０３等を用い、フ
ィンにはＪＩＳ３００３、Ｊ　Ｉ　５３２０３３１１Ａ
　、ｅ−０，３５％３ｉ　−０，２７％Ｃｕ−０，６％
ＭｇのＡ　Ａ　６９５１を芯材とし、その両面にＡｌ−
８ｉ−１ｖｌｏ系合金ろう拐、例えばＡ（−１０％５ｉ
−１，５％ＭＩＪのＪＩＳ４００４、又はＡ（−１０％
５ｉ−１，５％Ｍｇ−ｏ、１％ＢｉのＡ　Ａ　４１０４
を８面につき全板厚の約１０％被覆した厚ざ０，１３〜
０．１６ｍのプレージングシートを用い、通常１０−４
〜１０−５１−ｏｒｒの真空中で約６００℃の温度に３
〜１０分程度加熱して接合している。Conventional extruded multi-hole tube has A, elIi degree of 99.5wt
% (hereinafter wt% is simply abbreviated as %) is J131050 above.
, A, 9-0.15% Cu JISIloo, A, e
-0,15%Cu-1,1%Mn JIS3003, A
, 2-i, i%Mn Ji33203 etc. are used, and the fins are JIS3003, JI 53203311A.
, e-0,35%3i-0,27%Cu-0,6%
Mg AA 6951 is used as the core material, and Al-
8i-1vlo alloy wax, e.g. A(-10%5i
-1.5% MIJ JIS4004 or A (-10%
5i-1,5%Mg-o, 1%Bi A A 4104
The thickness is 0.13~, which covers about 10% of the total plate thickness on 8 sides.
Using a 0.16m praising sheet, usually 10-4
3 to a temperature of about 600°C in a vacuum of ~10-51-orr.
They are joined by heating for about 10 minutes.

近年省エネルギー及８びコストダウンの見地から熱交換
器コアーのａｍ化が強く望まれ、これに対応するためフ
ィンの薄肉化が検討されている。しかし前記プレージン
グシートからなるフィンを０．１３＃ＩＩＩより薄肉化
り−ると６００℃前後のろう付は温度にＪ５いてフィン
が座屈する問題があった。In recent years, from the standpoint of energy saving and cost reduction, there has been a strong desire for AM heat exchanger cores, and in order to meet this demand, thinning of the fins is being considered. However, when the fins made of the plating sheet are made thinner than 0.13#III, there is a problem that the fins buckle at a temperature of J5 during brazing at around 600°C.

本発明はこれに鑑み種々検討の結果、ろう付は時におけ
るフィンの座屈はブレージングシー１〜のろう材中の３
ｉが芯材中に拡散し、芯材をＡｌ−８１系に合金化して
融点と強度を低下させるために起ることを知見し、更に
検討の結果、ろう材を被覆しない裸のフィンを用いるも
、ろう付番プが可能で、熱交換器コアーの軽量化及びコ
ストダウンが１１Ｔ能で、チューブの耐食性を向上させ
ることができるアルミ製熱交換器用多穴チューブとその
製造法を開発したものである。In view of this, the present invention has conducted various studies and found that buckling of fins during brazing is caused by brazing seams 1 to 3 in the brazing filler metal.
It was discovered that this occurs because i diffuses into the core material and alloys the core material with Al-81 system, lowering the melting point and strength.As a result of further investigation, bare fins without coating with brazing material were used. We have developed a multi-hole aluminum tube for heat exchangers and its manufacturing method that can be brazed, reduce the weight and cost of the heat exchanger core by 11T, and improve the corrosion resistance of the tube. It is.

即ち本発明チューブは第３図に示Ｊように融点が６３０
’Ｃｕ上のＡ、ｅ又はＡ、ｅ合金からなる押出多穴デユ
ープ（１）の外表面にＡぶ一６〜１３％Ｓｉ−〇、４〜
３％ＭＣＩ系合金ろう祠（３）を３０〜８０μの厚さに
被覆したことを特徴とりるものぐある。That is, the tube of the present invention has a melting point of 630 as shown in FIG.
'The outer surface of the extruded multi-hole duplex (1) made of A, e or A, e alloy on Cu is
This product is characterized by being coated with a 3% MCI alloy braze (3) to a thickness of 30 to 80μ.

また本発明製造法は、融点が６３０℃以上のＡ１１ｉよ
／１合金からなる押出多穴チューブを、ＡＩ！−６〜９
％３ｉ−０，４〜３％ＭＯ系合金からなる一次ろう材の
６１０〜６３０℃の溶融浴中に１〜５９秒間浸漬して、
チューブ外表面に一次ろう祠を溶融メッキした後、Ａ、
ｅ−９〜１３％３ｉ−０，４〜３％Ｍｇ系合金からなる
二次ろう材の５９０〜６１０℃の溶融浴中に１〜５９秒
問浸漬し゛【、−次ろう拐上に更に二次ろう材を溶融メ
ッキし、３０〜８０μの厚さにろう材を被覆Ｊることを
特徴とするものである。Furthermore, the manufacturing method of the present invention can produce an extruded multi-hole tube made of A11i/1 alloy with a melting point of 630°C or higher using AI! -6～9
%3i-0.4 to 3% MO alloy by immersion in a molten bath of 610 to 630°C for 1 to 59 seconds,
After hot-dip plating the primary brazing pad on the outer surface of the tube, A.
e-9 to 13% 3i-0,4 to 3% Mg-based alloy was immersed in a molten bath of 590 to 610°C for 1 to 59 seconds. Next, a brazing material is hot-dipped and coated with the brazing material to a thickness of 30 to 80 microns.

本発明において、押出多穴チューブの融点を６３０℃以
上と限定したのは、融点が６３０℃未満ではＡｚ−ｓｔ
−ｖｇ系合金ろう祠の溶融メッキに際し、デユープがろ
う材中に溶解し易くなり、ろう材の溶融メッキが困難と
なるばかりか、チューｌの肉厚が減少するためである。In the present invention, the melting point of the extruded multi-hole tube is limited to 630°C or higher because if the melting point is lower than 630°C, Az-st
-During hot-dip plating of a vg-based alloy braze, the dupe easily dissolves in the brazing material, which not only makes hot-dip plating of the brazing material difficult, but also reduces the thickness of the tulle.

融点が６３０℃以上のＡＩ！又はＡＩ！合金とし【は、
例えばＪ、Ｉ　５１０５０．１１００．３００３．３２
０３．３００５等を用いればよい。AI with a melting point of 630℃ or higher! Or AI! Alloy [is,
For example J, I 51050.1100.3003.32
03.3005 etc. may be used.

またチューブ外表面にＡＪ！−８ｉ−１ｖＨ＋系合金ろ
う祠を３０〜８０μの厚さに被ｉｔ＋るのは、ろう祠を
被覆しない裸のフィン材、例えばＪＩＳ３００３．３２
０３．５００５．６９５１等からなるフィン材との組合
わＬにおいて、ろう付けを可能にするためであり、ろう
拐の被覆厚さが３０μ未満でも、８０μを越えＣも良好
な真空ろう付番ノが得られないためである。Also, AJ on the outer surface of the tube! -8i-1vH+ alloy braze is coated with a thickness of 30 to 80μ by bare fin material that does not cover the braze, such as JIS3003.32
This is to enable brazing in combination L with fin material made of 03.5005.6951 etc. Even if the brazing thickness is less than 30μ, it is more than 80μ and has a good vacuum brazing number C. This is because it cannot be obtained.

Ａ、ｅ−８ｉ−Ｍｇ系合余ろう材としては、Ｓｉ６〜１
３％、Ｍａｏ、４〜３％を含み、残部Ａｉかうなる合金
を用い、ろう材の流動性及び濡れ性を改善する必要があ
る場合にはＢｉを０．２％以下、ｐｂを０．３％以下、
Ｓ「を０．３％以下の範囲内で何れか１種又は２種以上
を加え、ろう祠をアノードとし゛（電気防食性を改善す
る必要がある場合にはＺｒ２を３ｗｔ％以下、ＳＯを０
．３％以下、ｉｎを０．３％以下の範囲で何れか１種又
は２種以上を加えるとよい。特にこれ等の内ろう材の流
動性及び濡れ性の改善にはＢ１の添加が最も有効であり
、ろう拐の電気防食性の改善にはＩｎとＳ１１の添加が
最も有効である。A, e-8i-Mg alloy brazing filler metal is Si6~1
When using an alloy containing 3% Mao, 4 to 3% and the balance Al, and it is necessary to improve the fluidity and wettability of the brazing filler metal, Bi is 0.2% or less and PB is 0.3%. %below,
Add one or more of S' within the range of 0.3% or less, and use the wax as an anode.
．． It is preferable to add one or more of these in an amount of 3% or less and an in of 0.3% or less. In particular, the addition of B1 is most effective for improving the fluidity and wettability of these inner brazing filler metals, and the addition of In and S11 is most effective for improving the electrolytic corrosion protection of brazing filler metals.

上記ろう材において、Ｓｉはろう材の融点を下げるため
であり、その含有ｍ６〜１３％と限定したのは、６％未
満でも１３％を越えてもろう材の融点高くなり、溶融メ
ッキやろう付けが困難となるためである。ＭＱは３ｉと
共存さぜることで、ろう材の融点を下げると共に、フラ
ックスや超音波や１Ｍ！擦手段を用いることなく、溶融
メッキを均一にし、かつ真空ろう付は時にゲッター材と
して働き、ろう付けを可能ならしめるためである。即ら
６００℃前後の溶融ろう材中に多穴チューブを浸漬Ｊる
と、アルミ素地と酸化皮膜（Ａ、ｅｚ　Ｏａ　）との熱
膨張の差により、酸化皮膜に亀裂が生じ、チューブに清
浄な面が露出するため、ろう材が濡れ易くなる。またろ
う材中のＭｇが酸化皮膜（Ａλ２０３）と反応し、ＭＯ
ＡＪ２０等１のＭｉｌｌ酸化物を生成し、該皮膜がＡ、
ｅｚ　０３よりもろう材の濡れ性が良く、一層ろう材の
濡れ性を促進し、ろう材が均一にメッキされ易くなる。In the above-mentioned brazing filler metal, Si is used to lower the melting point of the filler metal, and the reason for limiting its content to m6 to 13% is that if it is less than 6% or more than 13%, the melting point of the filler metal will rise, so it is difficult to use hot-dip plating. This is because it becomes difficult to attach. By coexisting with 3i, MQ lowers the melting point of the brazing filler metal, and also allows flux, ultrasonic waves, and 1M! This is to make the hot-dip plating uniform without using any rubbing means, and to make the vacuum brazing possible by sometimes acting as a getter material. That is, when a multi-hole tube is immersed in molten brazing filler metal at around 600°C, cracks occur in the oxide film due to the difference in thermal expansion between the aluminum base and the oxide film (A, ez Oa), and the tube becomes clean. Since the surface is exposed, the brazing filler metal gets wet easily. In addition, Mg in the brazing metal reacts with the oxide film (Aλ203), and the MO
A Mill oxide of 1 such as AJ20 is produced, and the film is A,
It has better wettability of the brazing material than ez 03, further promotes wetting of the brazing material, and makes it easier to plate the brazing material uniformly.

更にろう材中に残ったＭｏは真空ろう付【ノ時に蒸発す
ることより、炉内雰囲気を清浄化するゲッター作用をな
し、真空ろう付けを容易になる。しかしてＭＱ含有量を
０．４〜３％と限定したのは、０．４％未満では上記溶
融メッキ、並びにろう付は時のゲッター効果が不十分で
あり、３％を越えると効果が飽和Ｊ゛るばかりでなく、
真空ろう付は時に蒸発して炉壁に４４着するＭｇ量が増
大し、これを定期的に除去Ｊる必要が生じ、作業上大き
な負担となるためである。Furthermore, the Mo remaining in the brazing material evaporates during vacuum brazing, which acts as a getter to clean the atmosphere in the furnace, making vacuum brazing easier. However, the reason why the MQ content was limited to 0.4 to 3% is that if it is less than 0.4%, the getter effect during hot-dip plating and brazing is insufficient, and if it exceeds 3%, the effect is saturated. Not only J゛ru but also
This is because vacuum brazing sometimes evaporates and increases the amount of Mg deposited on the furnace wall, which requires periodic removal, which poses a heavy workload.

またろう材の流動性及び濡れ性改善の目的で添加ＪるＢ
ｉの含有量を０．２％以下と限定したのは、０．２％を
越えて含有せしめると、多穴チューブの曲げ加工時にろ
う材の被覆層に割れなどを発生し、チューブの成形性を
阻害するためである。またろう材の電気防食性の改善に
添加するＺｌｌの含有量を３％以下と限定したのは、含
有量が３％を越えると、真空ろう付は時に炉壁を極端に
ｔＳ染するようになるためである。Also added for the purpose of improving the fluidity and wettability of the brazing filler metal.
The reason why the content of i was limited to 0.2% or less is that if the content exceeds 0.2%, cracks will occur in the brazing filler metal coating layer during bending of a multi-hole tube, and the formability of the tube will deteriorate. This is to inhibit the In addition, the reason why the content of Zll added to improve the electrolytic corrosion protection of the brazing metal was limited to 3% or less is because if the content exceeds 3%, vacuum brazing may cause extreme tS staining of the furnace wall. To become.

本発明において押出多穴チューブの外表面に上記ろう拐
を３０〜８０μの厚さに被ＩＴ＋−５するためには、融
点の高いＡ（−６〜９％３ｉ−０，４〜３％Ｍｇ系合金
からなる一次ろう材を溶融メッキした後、融点の低いＡ
（−９〜１３％３ｉ−０，４〜３％ＩＶＨＩ系合金から
なる二次ろう祠を溶融メツキタる。このような溶融メッ
キを２回に分りで行なうのはチューブ外表面に真空ろう
ｉ＝ｔけに必要なＷさ３０〜８０μのろう材層を形成す
るためで、１回だ（プの溶融メッキではろう月の３ｉ含
有量をどのように選んでも厚さ３０μ以上のろう材層を
形成することはぐきない。In the present invention, in order to coat the outer surface of the extruded multi-hole tube with the above-mentioned solder to a thickness of 30 to 80 μm, A (-6 to 9% 3i-0, 4 to 3% Mg After hot-dip plating the primary brazing filler metal made of alloy based on A, which has a low melting point.
(-9 to 13% 3i-0, 4 to 3% IVHI alloys are melt-plated. This hot-dip plating is carried out in two steps, so that the outer surface of the tube is vacuum soldered i= This is to form a brazing filler metal layer with a W thickness of 30 to 80μ, which is necessary for the process. It is difficult to form.

一次ろう拐のｗＪ融メッキにおい１、浴温を６１０〜６
３０℃、浸漬時間を１〜５９秒と限定したのは、−次ろ
う材の良好なメッキ層を得るためで、６１０℃未満の温
度では一次ろう材の液相線温度に近く、完全溶解となっ
ていないため良好なメッキが得られず、６３０℃を越え
る温度では多穴チューブの固相線温度を越え、チューブ
の一部に変形や溶解が起り、また浸漬時間が１秒未満で
は予めチューブを予熱したどしてもメッキが不完全とな
り、６０秒を越えるとろう材中の３ｉがチューブ内に部
分的に深く粒界拡散づるばかりか、ろう付番］に必要な
厚さのメッキ層が得られなくなり、更に溶融ろう材中に
アルミが溶Ｇノ込み、その結果チューブ肉厚の減少を招
くためである。Primary waxing wJ fusion plating odor 1, bath temperature 610-6
The reason why we limited the immersion time to 30℃ and 1 to 59 seconds was to obtain a good plating layer of the secondary brazing filler metal.At temperatures below 610℃, it is close to the liquidus temperature of the primary brazing filler metal, and it is difficult to completely melt. If the temperature exceeds 630°C, the solidus temperature of the multi-hole tube will be exceeded, causing deformation or melting of a part of the tube, and if the immersion time is less than 1 second, the tube will not be properly plated. Even if preheated, the plating will be incomplete, and if the time exceeds 60 seconds, not only will the 3I in the brazing filler metal diffuse partially deep into the grain boundaries within the tube, but the plating layer will not be as thick as necessary for the brazing number. This is because molten aluminum is no longer obtained, and furthermore, molten aluminum is mixed into the molten brazing filler metal, resulting in a decrease in the tube wall thickness.

二次ろう祠の溶融メッキにおいて、浴温を５９０〜６１
０℃、浸漬時間を１〜５９秒と限定したのは、メッキし
た一次ろう材上に二次ろう材の良好で均一なメッキ層を
形成するためで、５９０℃未満の温度Ｃは二次ろう祠の
液相線温度に近く、完全溶解となつＣいないため良好な
メッキが得られず、６１０℃を超える温度Ｃはメッキし
た一次ろう材層が溶解し、その結果３０μ以上の厚さが
得られず、また浸漬時間が１秒未満ではあらかじめチュ
ーブを予熱したとしてもメッキが不完全となり、６０秒
を越えるとろう材中の３ｉがチューブ内に部分的に深く
粒界拡散するばかりか、ろうイ」けに必要な厚さのメッ
キ層が得られないためである。In hot-dip plating of secondary brazing shrine, the bath temperature is 590-61
The reason why we limited the dipping time to 0℃ and 1 to 59 seconds was to form a good and uniform plating layer of the secondary brazing filler metal on the plated primary brazing filler metal. C is close to the liquidus temperature of the shrine and does not completely melt, making it impossible to obtain good plating.At temperatures above 610℃, the plated primary brazing metal layer melts, resulting in a thickness of 30μ or more. Furthermore, if the immersion time is less than 1 second, the plating will be incomplete even if the tube is preheated, and if the immersion time exceeds 60 seconds, not only will the 3i in the brazing filler metal diffuse partially deep into the tube, but also the soldering This is because it is not possible to obtain a plating layer of the thickness required for the process.

尚−次ろう材上にメッキする二次ろう材としＣ′は、−
次ろう祠の液相線温度よりｉｏ’ｃ以上低い液相線温度
のろう材を用い、−次ろう材の溶融メッキにおける浸漬
時間と二次ろう祠の溶融メッキにおける浸漬時間の合計
を６０秒以下と゛す°る必要があり、浸漬時間の合計が
６０秒を越えると、チューブが部分的にろう拐中に溶解
し、デユープの肉厚減少の原因となる。Furthermore, the secondary brazing filler metal C' to be plated on the next brazing filler metal is -
Using a brazing material whose liquidus temperature is more than io'c lower than the liquidus temperature of the secondary brazing pad, the sum of the immersion time in the hot-dip plating of the secondary brazing material and the immersion time in the hot-dip plating of the secondary brazing pad is 60 seconds. If the total soaking time exceeds 60 seconds, the tube will partially dissolve during waxing, causing a decrease in the wall thickness of the duplex.

本発明において溶融メッキに先立って多穴チューブの表
面処理は特に必要ないが、表面を溶剤脱脂、アルカリエ
ツチング、研摩などにより清浄化し、必要に応じてチュ
ーブを予熱すれば溶融メッキの浸漬時間を短縮すること
ができる。また多穴チューブの熱間押出に続いて溶融メ
ッキを行なえば、チューブ表面が活性化しており、しか
もチュー１自体が３００℃以上に加熱されているため、
これが予熱の代りとなり、極く短時間（数秒）の浸漬に
より良好なメッキ層が得られる。In the present invention, surface treatment of the multi-hole tube is not particularly necessary prior to hot-dip plating, but the immersion time for hot-dip plating can be shortened by cleaning the surface by solvent degreasing, alkali etching, polishing, etc., and preheating the tube as necessary. can do. Furthermore, if hot-dip plating is performed following hot extrusion of a multi-hole tube, the tube surface will be activated, and the tube 1 itself will be heated to over 300°C.
This is an alternative to preheating, and a good plating layer can be obtained with extremely short immersion (several seconds).

このように本発明は多穴チューブの表面にＡλ−６〜１
３％Ｓｉ　−０，４〜３ｗｔ％Ｍｌｌ系合金ろう材を被
覆したもので、ろう材の被覆は極めて容易であり、かつ
両面にろう材を被覆したプレージングシートからなるフ
ィンを用いることなく、裸のフィンと組合わせ゛Ｃ真空
ろう付けにより熱交換器コアーを得ことができる。従っ
て真空ろう付は時のフィンの耐座屈性が良好で、フィン
の薄肉化が可能となる。更にチューブの外表面には電位
の高いろう拐が被覆されているため、腐食環境の厳しい
所で使用しても、チューブ側がフィンにょっＣ電気的に
防食されるメリットがある。In this way, the present invention provides Aλ-6 to 1 on the surface of a multi-hole tube.
It is coated with a 3%Si-0.4~3wt%Mll alloy brazing filler metal, and it is extremely easy to coat the brazing filler metal, and it does not require the use of fins made of plating sheets coated with brazing filler metal on both sides. A heat exchanger core can be obtained by vacuum brazing in combination with bare fins. Therefore, vacuum brazing provides good buckling resistance of the fins and allows the fins to be made thinner. Furthermore, since the outer surface of the tube is coated with high-potential solder, there is an advantage that the tube side is electrically protected from corrosion by the fins even when used in a harsh corrosive environment.

以下本発明を実施例について詳細に説明Ｊ゛る。The present invention will be described in detail below with reference to embodiments.

実施例（１） 第１図に示ず形状の通常のｈ法で造られた押出多穴チュ
ーブを用い、その外表面に第１表に示すＡ、ｅ−３ｉ−
Ｍｕ系合金の一次ろう材を溶融メッキし、その上にＡＪ
！−８＋−１ｖＨＩ系合金の二次ろう材を溶融メッキし
た。チューブについては特に前処理を施さず、約３００
℃に予熱した後、第１表に示す条件で一次ろう材の溶融
メッキと二次ろう材の溶融メッキを行なった。これ等に
ついて、メッキ状態を観察すると共に、チューブを蛇行
状に曲げ加工し、ＪＩＳ３００３からなる厚；ｊ５０．
１０ａｍ＋　（７）　ｍｌシルゲートフィン（高さｉｅ
ｓ、ピッチ４嗣、巾２２釧ンと組合わせ、５ｘｌＯ−Ｉ
　Ｔｏｒｒの真空中で６１０℃の温度に５分間加熱し′
（真空ろう付けし、第２図に示づ熱交換器ファーを作成
し、これについてろう付は性、ろうの流動性及びチュー
ブの耐食性を調べた。これ等の結果を第２表に示１゜尚
ろう付ＧＪ性についＣはチューブとフィンの接合が得ら
れなかったものを不可、不均一なものを不良、ろう付は
性が完全なものを良とした。Example (1) An extruded multi-hole tube made by the normal h method with a shape not shown in Fig. 1 was used, and the outer surface was coated with A, e-3i- shown in Table 1.
A primary brazing filler metal of Mu-based alloy is hot-dip plated, and AJ
! A secondary brazing filler metal of -8+-1vHI alloy was hot-dip plated. No particular pretreatment was applied to the tube, and approximately 300
After preheating to .degree. C., hot-dip plating of the primary brazing filler metal and hot-dipping plating of the secondary brazing filler metal were performed under the conditions shown in Table 1. Regarding these, the plating condition was observed, and the tube was bent into a meandering shape, and the thickness was JIS 3003: j50.
10am+ (7) ml silgate fin (height ie
Combined with s, pitch 4, width 22, 5xlO-I
Heat to a temperature of 610°C for 5 minutes in a vacuum of Torr.
(The heat exchanger fur shown in Fig. 2 was prepared by vacuum brazing, and the brazing performance, brazing fluidity, and corrosion resistance of the tube were investigated. The results are shown in Table 2. Regarding brazing GJ properties, C was graded as poor if the tube and fin could not be joined, bad if uneven, and good if the brazing was perfect.

流動性はノイレットの長さが１．５　ａｍ以上を翰、１
．０〜１．５＃ｉｌＢを良好（一般的）　、１．０　ｍ
以下ヲ不良とした。また耐食性を最も厳しいｆｇ食環境
を想定してＣＡＳＳ試験を５００時間４ｊない、デユー
プに生じた孔食深さが１００μ以下を優、１ｏｏ〜５０
０μを良好、５００以上を不良とした。Fluidity is 1.5 am or more when the length of the knotlet is 1.5 am or more.
．． 0-1.5 #ilB good (general), 1.0 m
The following items were classified as defective. In addition, the corrosion resistance was tested by CASS test for 500 hours assuming the most severe FG corrosion environment.
A value of 0μ was considered good, and a value of 500 or more was considered poor.

第　１　表　（１） 穴チューブ　Ｎｏ、チューブ　−次　ろ　う　旧材　質
　融点　組　成（％）　液相線温度メッキ条件、　（’
Ｃ）Ｓｉ　Ｍｇ　Ｂｉ　Ｚｎ　（’Ｃ）　５４度（℃ト
時間（秒）発明チューブ　Ｉ　ＪＩＳ１０５０６４６　
６　’１．５　−　−　６２０　６２５　５２　〃　Ｇ
７．５Ｎ−−ω８　６２０　Ｇ３　ｌｌｎ　９　ｕ　−
−５９７６１０Ｔｒ４　ｕ　ｎ　７．Ｓ　Ｇ０４　−　
’　６０８　Ｇ２０　１０５　ｕ　ｎ　ｎ　１．５　−
　−　Ｔｒ５　ｕ　ｎ　ｓ　３．Ｑ　−−Ｇ ７　ＪＩＳ３００３６４３　〃＋、５　０．０１　−　
ｐ８ｒｒ　ｕ　Ｎ　＃０．０８　−　ｒｒ　’＃　Ｇ９
　ｎ　ｎ　ｎ　ｓ　Ｏ，２−ＩＩ １０　ＪＩＳ３００５６３０　＃　Ｎ　−０，２＃ｉｊ
　ｎ　ｎ　ｎ　〃−ｉ、５　ｎ １２　ｌｌ〃〃〃−３，０、。Table 1 (1) Hole tube No., tube -Next wax Old material Melting point Composition (%) Liquidus temperature plating conditions, ('
C) Si Mg Bi Zn ('C) 54 degrees (℃ time (seconds) Invention tube I JIS1050646
6 '1.5 - - 620 625 52 〃G
7.5N--ω8 620 G3 lln 9 u-
-597610Tr4 un 7. S G04 -
' 608 G20 105 u n n 1.5 -
- Tr5 uns 3. Q --G 7 JIS3003643 〃+, 5 0.01 -
p8rr u N #0.08 - rr '# G9
n n n s O,2-II 10 JIS3005630 #N -0,2#ij
n n n 〃-i, 5 n 12 ll〃〃〃-3,0,.

１３　ｎ　〃＃　ｎ　Ｏ，０８１゜５　ｎ１４　ＡＪ！
−０，４％Ｃｕ ６１１５　Ｂ　ＩＩ　Ｏ，０１−曲５　Ｇ１５　７１５
　１１　ｎ　ａｎ　−−ｕ ｉｌｉ　ＩＩ　ｎ　＃　ＩＩ　＝−Ｇ １７　＃　ｎ　＃　＃　−−ｓ ＋８　ＡＪ！−０，３％Ｃｕ　−０，３％Ｍｎ６４３　
＃　ＩＩ　−−ｎ ｉ９　ＩＩ　ｎ　Ｔｒ　１１　−　−　Ｉｔ〃２Ｑ　ｕ
　ｎ　ａｎ　−−ｎ ２１　’　＃　＃　＃　、Ｉｔ　−−ＩＴ　〃＃２２　
ＪＩＳＩＩω　ｍ　７．５　〃−−６０８６３０１２３
＃　−〃Ｎ−−−＃５９ ２４　ｎ　ｎ　ｎ　ｕ−−ｎ　ｎ　ＩＱ二　次　ろ　う
　材 組　成（％）　液相線温度メッキ条件 Ｓｔ　Ｍｇ　Ｂｉ　Ｚｎ　（’Ｃ）　１１２度（’Ｃ）
時間（秒）１２　１．５　−−　５８０　５９５　５ｎ
　ｒｒ　−−ｕ　ｆｉＱＱ　ｕ ＃　＃　−−〃６１Ｑ　ｎ １０　ｕ　Ｏ，０＋　−５９０６０５１ｒｒｕｎ−’＃ １３　＃　−−５９３５９０１５ ９〃−−５９５　６００　。13 n〃#n O,081゜5 n14 AJ!
-0,4%Cu 6115 B II O,01-Track 5 G15 715
11 n an --u ili II n # II =-G 17 # n # # --s +8 AJ! -0,3%Cu -0,3%Mn643
# II --n i9 II n Tr 11 --- It〃2Q u
n an --n 21'###, It --IT 〃#22
JISIIω m 7.5 〃--608630123
# -〃N---#59 24 n n n u--n IQ secondary filler material composition (%) Liquidus temperature plating condition St Mg Bi Zn ('C) 112 degrees ('C)
Time (seconds) 12 1.5 -- 580 595 5n
rr --u fiQQ u # # --〃61Q n 10 u O,0+ -5906051rrun-'# 13 # --59359015 9〃--595 600.

１２　０．４　−　−　５８０　５９５　１０ｒｒ　３
．Ｑ　”　−＋　Ｈ 、１，５０，２−、、、。12 0.4 - - 580 595 10rr 3
．． Q ” −+ H , 1,50,2−,,.

＃　＃　−０，２＃ ｎ　ｒｒ　−３，０＃　ｎ　ｎ ／Ｊ　ｓ　Ｏ，０８１，５〃〃’ ｎ　＃　−−ＩＩ　ｒｒ　ｓ ＃　ＩＩ　−−ｎ　ｎ　ｌ ｎ　ｎ　−、−ｎ 第　１　表　（２） トユー７　１１Ｊｏ、チューブ　−次　ろ　う　拐材　
質　融点　組　成（％）　液相ｉｉ１服メッキ条件（’
Ｃ）　Ｓｉ　ＭＯＢＩ　Ｚｎ　（”Ｃ）　ＩＪ（’Ｃ）
時間（秒）　５ｎチュー−；／　２５　ＪＩＳｌｌｏｏ
　６４３　７．５　１．５−−　６０８　６３０　１　
１２６　ｎ　ｎ　ｎ　＃　−−７１＃　３０’／トユー
ブ　２７　ＪＩＳ１０５０６４６　ｎ　ｒｒ−−ｎ　６
４０　１６”　＋２８　ｕ　＃　ｓ　ｎ　−−ｎ６２０
　ｎ　ａｎ　２９　ｎ　ｎ　ｎ　＃　−−ｕ　６ＱＱ　
＃　ｒ□３０　／ｌ　＃　４　ｓ　−−６３３６３０ｕ
　ｎ３１　ｌｒ　ｎ　１０　ｍ　−−５！１０　６２Ｏ
ｎ　！１３２　ｎ　ｎ　７．５　ｎ　−−ｆｉ０８　６
３０　Ｇ３３　ｎ　ｎ　ｎ　＃　−−ｕ　＃　ｎ　ｉ３
４　＃　〃＃　０，２　−　−ｎ６２０　ｎ１３５　〃
　〃　〃　し５　−　−　〃 ３１ｉ　ｎ　ｎ　ｎ　＃　−−ｎ　ｎ　Ｑ、５　Ａ３７
　ｎ　ｎ　ｎ　ｓ　−−ｕ　ｎ　ｉＱ　ｒｒ北　ＪＪ　
Ｎ　Ｉｔ　＃　−−〃＃　８Ｑ　＃ｎ３９ｎｎｎｎ−−
ＩＩ＃１Ｑｎ ４Ｑ　ｔｒ　ｎ　＃　ｎ　−−ｎ　ｕ　４Ｑ　ａ二　次
　ろ　う　材 組　成（％）　液相Ｉｉ！温度メッキ条件：ｉ　ＭＱ　
Ｂｉ　Ｚｎ　（’Ｃ）　ｍ度（’Ｃ）ＩＮＩＩＩＩ（秒
）！　ｉ、５　−　−　５８０　５９５　５９＃　−Ｉ
Ｔ　ＩＴ　（支） ”　−−５８５ｎ　１６ ’−−＃６２０＃ 〃−−〃５８０＃ ｎ　−−ｓ　（ｉＱＱ　。# # -0,2# n rr -3,0# n n /J s O,081,5〃〃' n # --II rr s # II --n n l n n -, -n Table 1 (2) Toyu 7 11Jo, tube - next waxing material
Quality Melting point Composition (%) Liquid phase II1 plating conditions ('
C) Si MOBI Zn (”C) IJ(’C)
Time (seconds) 5n Chu; / 25 JISlloo
643 7.5 1.5-- 608 630 1
126 n n n # --71 # 30'/Teube 27 JIS1050646 n rr --n 6
40 16” +28 u #s n --n620
n an 29 n n n # --u 6QQ
#r□30/l #4s --633630u
n31 lr n 10 m --5!10 62O
n! 132 n n 7.5 n --fi08 6
30 G33 n n n # --u # n i3
4 # 〃# 0,2 - -n620 n135 〃
〃 〃 し5 - - 〃 31i n n n # --n n Q, 5 A37
n n n s --u n iQ rr north JJ
N It # --〃#8Q #n39nnnn--
II#1Qn 4Q trn #n --nu 4Qa Secondary filler metal composition (%) Liquid phase Ii! Temperature plating conditions: i MQ
Bi Zn ('C) m degrees ('C) INIII (seconds)! i, 5 - - 580 595 59# -I
TIT (branch) ” --585n 16'--#620#〃--〃580# n --s (iQQ.

１．５　１．　−　−　（３） １　＃　−−６１０ １〃−−５８５５９５〃 ０．２　−−ｕ １．５　−　−、　＃ ｎ　−−ｎ　’　ｒｒ　Ｑ、５ ｎ　−−ｕ　ｎ　ｉＱ ＃　−−ｎ　、ｕ　７Ｑ 〃−−〃＃４０ 切 ４１８＠ζ靴ｌ１Ｉｌミ篭−ζ嘔歓ζζ側ζ歓脇 駅 醐ｍｉたζζミ丸邸舞喚側ζ−準側崎概別 艙 つ ミ 憎 賭ｃｑ　、　１１ｗ靴ζ靴ζ靴ミ社靴歓Φ歇１彊 −城 −の 砦 儒　− ミ ≦一 つ Ｃ５Ｊｌｌｊｚ ’ｒ’ｒ＋　宿Ａ　８９篭　鴫８舞　ζ８勉　歓哨ΦΦ
−へ 臂 汝 ｚ　ｒ−（’Ｊの？　Ｌｌ’）　Ｃｏ　トの■９　：ｌ
：　ｐ　ｐ　：ｌ！　＋４９１ト、 昏　大 騙で 儒　へ ミ ３−／ イ１ ２　″：起＝８にさ８真目出に起さ８お宮ト、 へ１ 篭 憎 腿哨寸輪の−８に宮 侶 敲 硯　− ≦− 蝮 へ　１ 什４＋−妥９！＝目靴８靴８ ス 味　ｉ臂 ］牛 ２８品８８宮８冑容 第１表及び第２表から明らかなように、融点が６３０℃
以上の純Ａ（及びＡ（合金からなる押出多穴チューブを
、Ａλ−６〜９％５ｉ−０，４〜３％ＭＩＪ系合金から
なる一次ろう材の６１０〜６３０℃の溶融浴中に１〜５
９秒浸漬して一次ろう材を溶融メッキしＩｃ後、／’Ｊ
！−９〜１３％５ｉ−０．４〜３％Ｍｕ系合金からなる
二次ろう材の５９０〜６１０℃の溶融浴中に１・〜５９
秒浸漬して二次ろう材を溶融メッキし、かつ−次ろう材
と二次ろう材の合計量ｌＩＩ、＋１間を６０秒以］τと
してチューブ表面にろう材を溶融メッキした本発明チュ
ーブＮ００１〜２６は、何れもメッキ状態が良好Ｃ１第
４図（イ）に示すようにブー１−ブ（１）内部にろう材
（３）中の８１のｈ′Ｏ部拡散深さく１１）が３〜３５
μと浅く、熱交換器」ブーのろうイ４け性及び耐食性も
優れていることが判る。1.5 1. - - (3) 1 # --610 1〃--585595〃 0.2 --u 1.5 - -, # n --n' rr Q, 5 n --u n iQ # --n, u 7Q 〃--〃#40 Kiri 418 @ ζ shoes l1Il Mi basket - ζ o huan ζ ζ side ζ Kanwaki station 醜 it was ζ ζ Mimaru residence dance side ζ - quasi side zaki general betsu tsumi hate bet cq, 11w Shoes ζ Shoes ζ Shoes Misha Shoes Welcome Φ 1 彊 - Castle - Fort Confucianism - Mi ≦ One C5 Jlljz 'r'r + Inn A 89 baskets 8 dances ζ 8 studies Kanto ΦΦ
-Here you z r- ('J's? Ll') Co's ■9 :l
: p p :l! +491 To, Confucianism in the great deception Hemi 3-/I1 2 ″: 8 Omiya To, 8 Omiya To, 8 Omiya To, 8 Omiya To, To 1 Kago Hate Shusunwa -8, Shrine inkstone - ≦- To the viper 1 tithe 4 + - 9! = Eye shoes 8 shoes 8 taste i arm] 28 items of beef 88 palaces 8 bowls As is clear from Tables 1 and 2, the melting point is 630°C
The above extruded multi-hole tube made of pure A (and A (alloy) ~5
After dipping for 9 seconds and hot-dip plating the primary brazing filler metal, /'J
! -9~13%5i-0.4~3%Mu-based alloy in a molten bath at 590~610°C with 1.~59
Tube No. 001 of the present invention, in which the secondary brazing filler metal is molten plated by dipping for seconds, and the total amount of the -secondary brazing filler metal and the secondary brazing filler metal lII, +1 is set to 60 seconds or more ]τ on the tube surface. - 26 are all in good plating condition C1 As shown in Figure 4 (a), the diffusion depth 11) of the h'O portion of 81 in the brazing filler metal (3) is 3. ~35
It can be seen that the heat exchanger's brazing resistance and corrosion resistance are excellent.

これに対しチュー１及びろう材が本発明の範囲でも、−
次ろう材の溶融メッキにおける浴温が本発明の範囲を越
えて高い比較チューブＮ　ｏ、２７ではチューブの一部
が溶解し、二次ろう材の溶融メツキにおける浴温か本発
明の範囲を越えで高い比較ブーユープＮ　ｏ、２８では
、−次ろう材が二次ろう拐の溶融浴中に溶解し易く、メ
ッキ厚さが３０μ以−トどなり、ろう付番ノ性及び耐食
性が不ｉすとなる。また−次ろう拐と二次ろう材の溶融
メッキにお４する浴温が本発明の範囲より低い比較チュ
ーブＮ　Ｏ，２９ひは、溶融メッキができｆ１外観上も
好ましくないばかりか、ろう付は性も不可となる。On the other hand, even if the chew 1 and the brazing filler metal are within the scope of the present invention, -
In comparison tube No. 27, where the bath temperature during hot-dip plating of the secondary brazing filler metal was higher than the range of the present invention, a part of the tube melted, and the bath temperature during hot-dip plating of the secondary brazing filler metal exceeded the range of the present invention. In the case of a high comparison No. 28, the secondary brazing filler metal easily dissolves in the molten bath of secondary brazing, the plating thickness becomes 30μ or more, and the brazing properties and corrosion resistance deteriorate. . In addition, comparative tube No. 29, in which the bath temperature used for secondary brazing and hot-dip plating of the secondary brazing metal is lower than the range of the present invention, is not only unfavorable in appearance, but also sex is also prohibited.

−次ろう材の溶融メッキにおい°（ろう材の３ｉ含有員
が少ない比較チューブＮｏ、３０Ｃはメッキ状態が不良
で、ろう付は性も不可となり、Ｓｉ含有量の多い比較チ
ューブＮ　ｏ、３１では二次ろう材の溶融メッキにおい
て、−次ろう材層が溶は出し、全体のメッキ層が厚くな
らず、ろう付は性が不良とな。また二次ろう材の溶融メ
ッキにおいて、ろう材の３ｉ含有量の少ない比較チュー
ブＮ　ｏ、３２及び３ｉ含有量の多い比較チューブＮ　
Ｏ，３３では、何れもメッキ層が不均一となり、ろう付
は性も不良となる。更に一次ろう材及びニー次ろう材の
溶融メッキにおい゛（、それぞれろう材のＭｌ＋含有量
が少ない比較チューブＮ　ｏ、３４、Ｎｏ、３５ではメ
ッキが不均一どなるぽかりか、厚くメッキすることがＣ
ぎず、ろうＧｌけ性も不可である。- Next, in the hot-dip plating of the brazing filler metal (comparison tube No. 30C, which has a low 3i content in the brazing filler metal, the plating condition is poor and brazing is not possible, and comparison tube No. 31, which has a high Si content) In hot-dip plating of secondary brazing filler metal, the second brazing filler metal layer melts and the overall plating layer is not thick, resulting in poor brazing properties.Furthermore, in hot-dip plating of secondary brazing filler metal, Comparative tube No. with low 3i content, Comparative tube No. with high 32 and 3i content
In both O and 33, the plating layer becomes non-uniform and the brazing properties are poor. Furthermore, in the hot-dip plating of the primary brazing filler metal and the secondary brazing filler metal (comparative tubes No. 34, No. 35, each of which has a low Ml+ content in the brazing filler metal, the plating may be uneven, or it may be difficult to plate thickly).
It is also not suitable for wax or glaze.

チューブ、−次ろう材、二次ろう材及び溶融メッキの浴
温が本発明の範囲内であってもメッキ時間が一次ろう材
又は二次ろう材の溶融メッキの何れかで短かい比較チュ
ーブＮ　Ｏ，３６、Ｎ　ｏ、３７では、メッキＩ９ざが
３０μ以下と薄く、ろうｆｊけ性が不良　−となる。ま
た−次ろう材と二次ろう祠の溶融メッキにお番プる浸漬
時間の合計が６０秒を越える比較チュー７　Ｎ　Ｏ，３
８〜４０では、チューブが部分的に一部溶解するばかり
か、第４図（ロ）に示づようにチューブ（１）内部にろ
う材（３）中の３ｉが局部的に深く拡散°するばかりか
、ろう付は性及び耐食性が不良となることが判る。Comparative tube N in which the plating time is short by hot-dip plating of either the primary brazing material or the secondary brazing material even if the bath temperatures of the tube, the secondary brazing material, the secondary brazing material, and the hot-dip plating are within the range of the present invention. For No. 0, 36, No. 37, the plating I9 has a thin thickness of 30μ or less, and the solderability is poor. Also - comparison tube 7 in which the total immersion time for hot-dip plating of the secondary brazing filler metal and secondary brazing pad exceeds 60 seconds
At 8 to 40, not only the tube partially dissolves, but also 3i in the brazing filler metal (3) locally and deeply diffuses inside the tube (1) as shown in Figure 4 (b). Moreover, it is found that brazing results in poor properties and corrosion resistance.

尚、本発明チューブを用いて真空ろう付けした熱交抜器
コアーでは、Ｊ　Ｉ　８３００３からなる裸の厚さ０．
１０Ｍの比較的薄いコルゲート状フィンを用いたにもか
かわらず、何れもフィンの座屈は全く認められなかった
。比較のため、ＪＩＳＩ０５０からなる第１図に示す押
出チューブを用い、ろう材を溶融メッキ層ることなく、
第２図に示すように曲げ加工し、Ｊ１３３００３かうな
る芯材の両面に／１−１０％３ｉ−１，５％Ｍｇ合金ろ
うＵ　（Ｊ　Ｉ　８４００４）を片面あたり全板厚の１
０％を被覆した厚さ０．１６ｍ及び０．１２Ｍのル−ジ
ングシートをコルゲート状に加工したフィンと組合わせ
、上記実施例と同様の条件で真空ろう付けを行なったと
ころ、チューブとフィンのろう付番ノ性は良好で、厚さ
０．１６Ｍｍのフィンには座廂が認められなかったが、
厚さ０．１２顯のフィンには座屈が生じ、熱交換器とし
ての機能が得られなかっ１％−６ 実施例（２） 第１１２！ｌに承り形状の通常のｈ法で造られたＪＩＳ
　１０５０の押出多穴チューブを用い、その外表面に第
３表に示−’Ｊ’　Ａλ−３ｉ−ＭＩＪ系合金の一次ろ
う材を溶融メッキし、その上に液相線温度が一次ろう材
に比べて１０℃以上低いＡ、ｅ−８ｉ−ＭＯ系の二次ろ
う拐をメッキした。続いて実施例（１）と同様に真空ろ
う付けで熱交換器」アーを作成し、これについて諸性能
を調べた。その結果を第４表に示す。In addition, in the heat exchanger core vacuum-brazed using the tube of the present invention, the bare thickness of J I 83003 is 0.
Even though relatively thin corrugated fins of 10M were used, no buckling of the fins was observed. For comparison, an extruded tube made of JISI050 shown in Figure 1 was used, without a layer of hot-dip plating with brazing filler metal.
After bending as shown in Figure 2, apply 1-10% 3i-1,5% Mg alloy brazing U (J I 84004) to both sides of the J133003 core material by 1% of the total plate thickness per side.
Lusizing sheets with a thickness of 0.16 m and 0.12 m coated with 0.0% were combined with corrugated fins, and vacuum brazing was performed under the same conditions as in the above example. The brazing properties were good, and no rim was observed on the 0.16 mm thick fin, but
Buckling occurred in the fins with a thickness of 0.12 mm, and the function as a heat exchanger could not be obtained.1%-6 Example (2) No. 112! JIS made by the normal h method with a shape of l
A 1050 extruded multi-hole tube is used, and a primary brazing filler metal of the 'J' Aλ-3i-MIJ alloy shown in Table 3 is hot-dipped on its outer surface, and the liquidus temperature of the primary brazing filler metal is applied to the outer surface of the tube. A, e-8i-MO-based secondary solder was plated at a temperature of 10°C or more lower than that of the A, e-8i-MO system. Subsequently, a heat exchanger "A" was made by vacuum brazing in the same manner as in Example (1), and its various performances were investigated. The results are shown in Table 4.

第　３ チューブ　−次　ろ　う　セ Ｎｏ、材　質　融　点　組成（％）　液相線　メ　ッ　
キ（’Ｃ）’　Ｓｉ　ＭＱ　ＰＪ＆＜’Ｃ）　ｍ度（’
Ｃ）本発明チューブ　４１　ＪＩＳ１０５０　６４６　
６　１，５　６２０　６２５４２　、．８　＃６０５　
６２０ ４３　〃９　〃５９７　６１５ ４４　＃　ＩＩ　Ｉｔ　＃ 比較チューブ　４５ ４６〃 第　４　表 メ　ッ　生状態　ろう岨ノ性 外　観　平均メッキ　Ｓｉ拡散 厚ざ（μ）　深さくμ） 本発明チューブ　４１　均　−５０５良　好４２＃４５ ．４３＃４Ｇ ＃　羽　〃３５ 比較チューブ　４５＃２５４　不　良 ＃４６＃　δ 二　次　ろ　う　材　液相温 条件　組成（％）液相線　メッキ条件　度差（’Ｃ）時
間（秒）　Ｓｉ　Ｍｇ　温度（’Ｃ）　温度（’Ｃ）時
間（秒）１０　１２　１．５　５８０　５９０　１０　
４０５ ＩＩ　ＩＩ　ＩＩ　１７ １０．３　＃　５８７　５９５　、／　１０１０　ｎ　
５９０　６００　ｎ　７ ９．５　＃　５９４　３ 第３表及び第４表から明らかなように、−次ろう伺の液
相線温度と二次ろう材のそれとの差が１０℃以上で、後
は本発明範囲内の条件の本発明チューブＮ０．４１〜４
４はメッキ厚さが、いずれも３０〃以上で、熱交換器に
組立てた時のろう付は性も良好であった。3rd tube - Next wax No., material Melting point Composition (%) Liquidus line
Ki ('C)' Si MQ PJ&<'C) m degrees ('
C) Tube of the present invention 41 JIS1050 646
6 1,5 620 62542,. 8 #605
620 43 〃9 〃597 615 44 # II It # Comparative tube 45 46〃 Table 4 Condition Waxy appearance Average plating Si diffusion thickness (μ) Depth μ) Invention tube 41 Average -505 Good 42#45. 43#4G # Feather 〃35 Comparison tube 45#254 Defective #46# δ Secondary filler metal Liquidus temperature conditions Composition (%) Liquidus line Plating conditions Degree difference ('C) Time (sec) Si Mg Temperature ( 'C) Temperature ('C) Time (sec) 10 12 1.5 580 590 10
405 II II II 17 10.3 # 587 595, / 1010 n
590 600 n 7 9.5 # 594 3 As is clear from Tables 3 and 4, if the difference between the liquidus temperature of the secondary brazing material and that of the secondary brazing material is 10°C or more, then the main Invention tube No. 41 to 4 under conditions within the invention range
No. 4 had a plating thickness of 30 mm or more, and had good brazing properties when assembled into a heat exchanger.

それに比較して、液相線編度差が１０℃未満ｅある比較
チューブＮ　Ｏ，４５，４Ｇではメッキ厚さが３０〃未
満で、ろう付は性が不良となる。In comparison, in comparison tubes NO, 45, and 4G, which have a liquidus knitting difference of less than 10°C, the plating thickness is less than 30°C, and the brazing properties are poor.

このように本発明によれば、ろう材を被覆しない裸のフ
ィンを用いて熱交換器］アーの真空ろう付けが可能とな
り、かつフィンを薄肉化してｂ真空ろう付は時の座屈を
防止Ｊると共にデユープの耐食性を向上し得るもので、
熱交換器の軽量化及びコストダウンを可能になる顕著な
効果を奏°りるものである。As described above, according to the present invention, it is possible to vacuum-braze a heat exchanger using bare fins that are not coated with brazing material, and the fins can be thinned to prevent buckling during vacuum brazing. It can improve the corrosion resistance of the duplex along with J.
This has the remarkable effect of making it possible to reduce the weight and cost of the heat exchanger.

【図面の簡単な説明】[Brief explanation of drawings]

第１甲はアルミ製熱交換器用多穴チューブの一例を示゛
す°斜視図、第２図はアルミ製熱交換器コノ′−の一例
を示づ斜視図、第３図は本発明チューｌの一例を示ツ斜
視図、第４図（イ）、（ロ）はろう材を溶融メッキした
押出多穴チューブの要部拡大断面図で、（イ）は本発明
チューブ、（ロ）は比較チューブを示す。 １　押出多穴チューブ １ａ穴 ２　コルゲートツイン ３　溶融メッキろう祠 第１図 １゜ 第２図 第３図 第４図 （イ） （０）1A is a perspective view showing an example of a multi-hole tube for an aluminum heat exchanger, FIG. 2 is a perspective view showing an example of an aluminum heat exchanger tube, and FIG. An example is shown in a perspective view, and Figures 4 (a) and 4 (b) are enlarged cross-sectional views of the main parts of an extruded multi-hole tube coated with a brazing filler metal, in which (a) is the tube of the present invention and (b) is a comparison Tube shown. 1 Extruded multi-hole tube 1a hole 2 Corrugated twin 3 Hot-dip plating brazing shrine Fig. 1 ゜ Fig. 2 Fig. 3 Fig. 4 (A) (0)

Claims (5)

【特許請求の範囲】[Claims] （１）融点が６３０℃以上のＡ１又はＡ、ｅ合金からな
る押出多穴チューブの外表面に、Ａ１−６〜１３ｗｔ％
　Ｓ　ｉ　−０，４〜３　Ｉｔ％ＭＯ系合金ろう材を３
ｏ′にｇｏμの厚さに被覆したことを特徴とするアルミ
製熱交換器用多穴チューブ。(1) A1-6 to 13 wt% A1-6 to 13 wt%
S i -0,4~3 It% MO based alloy brazing filler metal 3
A multi-hole tube for an aluminum heat exchanger, characterized in that o' is coated to a thickness of goμ. （２）合金ろう材にＳｉ６〜１３ｗｔ％、Ｍｇ０．４〜
３ｗｔ％を含み、残部Ａｉかうなる合金ろう材、又はＳ
ｉ６〜１３ｗ【％、ＭｇＯ，４〜３ｗｔ％と、３　ｉ　
０，２１１Ｔｔ％以下又は／及びＺｎ５ｗｔ％以下を含
み、残部へぶからなる合金ろう材を用いる特許請求の範
囲第１項記載のアルミ製熱交換器用多穴チューブ。(2) Si6~13wt%, Mg0.4~ in alloy brazing filler metal
An alloy brazing filler metal containing 3wt% with the balance being A or S
i6~13w[%, MgO, 4~3wt%, and 3i
The multi-hole tube for an aluminum heat exchanger according to claim 1, using an alloy brazing filler metal containing 0,211 Tt% or less and/or Zn 5wt% or less, with the remainder being heb. （３）融点が６３０℃以上のＡ（又はＡ１合金からなる
押出多穴チューブを、１ｅ−６〜９ｗｔ％５ｉ−０，４
〜３ｗｔ％Ｍｇ系合金からなる一次ろう材の６１０〜６
３０℃の溶融浴中に１〜５９秒間浸漬して、チューブ外
表面に一次ろう材を溶融メッキした後、Ａぶ−９〜１３
ｗｔ％３ｉ−０，４〜３Ｗ【％Ｍｕ系合金からなる二次
ろう材の５９０〜６１０℃の溶融浴中に１〜５９秒間浸
漬して、−次ろう材上に更に二次ろう材を溶融メッキし
、３０〜８０μの厚さにろう材を被ｌｉすることを特徴
とするアルミ製熱交換器用多穴チューブの製造法。(3) Extruded multi-hole tube made of A (or A1 alloy) with a melting point of 630°C or higher, 1e-6 to 9wt%5i-0,4
610-6 of the primary brazing filler metal consisting of ~3 wt% Mg-based alloy
After immersing the tube in a molten bath at 30°C for 1 to 59 seconds to hot-dip plate the primary brazing filler metal on the outer surface of the tube,
wt%3i-0.4~3W [%] Immerse the secondary brazing filler metal made of Mu-based alloy in a molten bath of 590~610°C for 1~59 seconds to further apply the secondary brazing filler metal on top of the secondary brazing filler metal. A method for producing a multi-hole aluminum tube for a heat exchanger, which comprises hot-dip plating and covering with a brazing material to a thickness of 30 to 80 microns. （４）−次ろう材の液相線温度より１０℃以上低い液相
線温度の二次ろう材を用いる特許請求の範囲第３項記載
のアルミ製熱交換器用多穴チューブの製造法。(4) - The method for producing a multi-hole tube for an aluminum heat exchanger according to claim 3, which uses a secondary brazing filler metal whose liquidus temperature is 10° C. or more lower than the liquidus temperature of the secondary brazing filler metal. （５）−次ろう材溶融浴中の浸漬時間と二次ろう材溶融
浴中の浸漬時間の合計を６０秒以内とする特許請求の範
囲第１項又は第２項記載のアルミ製熱交換器用多穴チュ
ーブの製造法。(5) - For an aluminum heat exchanger according to claim 1 or 2, wherein the total immersion time in the secondary brazing filler metal molten bath and the immersion time in the secondary brazing filler metal molten bath is within 60 seconds. Method for manufacturing multi-hole tubes.