JPH048676B2

JPH048676B2 -

Info

Publication number: JPH048676B2
Application number: JP57091993A
Authority: JP
Priority date: 1982-05-28
Filing date: 1982-05-28
Publication date: 1992-02-17
Also published as: JPS58207591A

Description

[Detailed description of the invention]

本発明は銅と鉄との異種金属パイプの接合部品
に関するものである。従来、例えば冷凍機に於いて、鉄製ケースの圧
縮機側鉄パイプと冷媒導管用銅パイプとの接合に
銀、銅、亜鉛からなる銀鑞が使用されているが、
銀の含有量が20％以上と多い為高価であり、且つ
フラツクスを使用する為にその除去が必要とな
り、除去が不完全であると腐食を促進させてしま
う欠点があつた。この為、図面に示すように圧縮機側鉄パイプ１
と冷媒導管用銅パイプ２とを容易に接合し易いよ
うにこの両パイプ間に夫々対応する同材質の接合
用鉄パイプ３と接合用銅パイプ４とを介在させ、
この接合用両パイプ３，４を予め銀鑞より安価な
銅−錫系の鑞材５により真空炉あるいはCO／
CO₂変成の還元ガス炉内で炉中鑞付接合すること
が試みられた。しかしながら、銅−錫系の鑞材５は銀鑞と比較
して溶融温度が高い為炉中温度を約600℃から約
900℃まで上げる必要があり、この為、両パイプ
３，４接合時、一方の銅パイプ４が高温軟化して
強度が低下すると共に鑞材５中の錫が銅パイプ４
に拡散して該パイプが脆くなり、圧縮機からの振
動伝達に耐えられず亀裂がはいつて折損してしま
う虞れがあつた。本発明は斯かる点に鑑み、銅パイプ４の代わり
に銅−ニツケル系の合金製接合パイプ４′を使用
することにより該パイプ４′の軟化を防止すると
共に銅−錫系鑞材５中の錫が銅−ニツケル系の合
金製接合パイプ４′中の銅質部に拡散するのを防
止するようにしたものである。次に本発明による銅−ニツケル系の合金製接合
パイプ４′使用の接合部品と本発明改良前の銅パ
イプ４使用の接合部品とを比較した強度試験結果
を第１表に示す。尚、この試験に用いた炉中鑞材
５は銅92％、錫８％のものを銅−ニツケル系の合
金製接合パイプ４′は銅88.5％、ニツケル10％、
鉄1.5％のものを、銅パイプ４は純銅のものを採
用したものである。 TECHNICAL FIELD The present invention relates to a joint component for dissimilar metal pipes of copper and iron. Conventionally, in refrigerators, for example, silver solder made of silver, copper, and zinc has been used to join the iron pipe on the compressor side of the iron case and the copper pipe for the refrigerant conduit.
It is expensive because it has a high silver content of 20% or more, and since flux is used, it must be removed, and if the removal is incomplete, it has the disadvantage of accelerating corrosion. For this reason, as shown in the drawing, the compressor side iron pipe 1
In order to easily join the refrigerant conduit copper pipe 2, a joining iron pipe 3 and a joining copper pipe 4 made of the same material are interposed between the two pipes, respectively.
Both pipes 3 and 4 for joining are bonded in advance using a copper-tin based brazing material 5 which is cheaper than silver solder in a vacuum furnace or CO/
An attempt was made to perform in-furnace brazing in a CO ₂ converter reducing gas furnace. However, since the copper-tin based brazing material 5 has a higher melting temperature than silver solder, the temperature in the furnace can be changed from about 600℃ to about 600℃.
It is necessary to raise the temperature to 900℃, and for this reason, when both pipes 3 and 4 are joined, one of the copper pipes 4 softens at high temperature and its strength decreases, and the tin in the solder metal 5 melts into the copper pipe 4.
As a result, the pipe became brittle and could not withstand vibration transmission from the compressor, leading to cracks and breakage. In view of this, the present invention uses a copper-nickel alloy joint pipe 4' instead of the copper pipe 4, thereby preventing the pipe 4' from softening and reducing the content of the copper-tin brazing material 5. This is designed to prevent tin from diffusing into the coppery portion of the copper-nickel alloy joint pipe 4'. Next, Table 1 shows the strength test results comparing the joint parts using the copper-nickel alloy joint pipe 4' according to the present invention and the joint parts using the copper pipe 4 before the improvement of the present invention. The furnace brazing material 5 used in this test was made of 92% copper and 8% tin, and the joint pipe 4' made of a copper-nickel alloy was made of 88.5% copper, 10% nickel, and
The copper pipe 4 is made of 1.5% iron, and the copper pipe 4 is made of pure copper.

【表】尚、銅−ニツケル系の合金製接合パイプ４′に
含有される成分量はニツケルを0.5〜15％、鉄を
0.1〜２％、この残りを銅とするのが好ましく、
且つニツケル成分による強度性を更に助長させる
為に上述の鉄成分の他にマンガンを１％範囲内で
使用すれば一層好ましく、しかもこのマンガンは
銅−ニツケル系の合金製接合パイプ４′をパイプ
状にする際の押し出し加工性の向上と不純分の除
去に貢献することが判明した。以上の如く、本発明は鉄パイプ１と銅パイプ２
とを接合する第１、第２の接合パイプ３，４′同
志を銅−錫系の鑞材５を用いて炉中鑞付するもの
において、鉄パイプ１と接合される第１の接合パ
イプ３には鉄材を用い、銅パイプ２と接合される
第２の接合パイプ４′には銅−ニツケル系の合金
材を用いるようにしたので、第２の接合パイプ
４′はニツケル成分により約900℃の炉中温度でも
軟化しにくく強度が低下する虞れが少ないと共に
第２の接合パイプ４′中の銅質部に鑞材５中の錫
が拡散するのをニツケル成分により阻止されるた
め第２の接合パイプ４′が脆くなるのが防止され、
安価な鑞材５で強固な接合部品用パイプ３，４′
を製造することができる等、極めて有用である。[Table] The amount of ingredients contained in the copper-nickel alloy joint pipe 4' is 0.5 to 15% of nickel and 0.5 to 15% of iron.
It is preferable that 0.1 to 2% be made of copper, with the remainder being copper.
In order to further enhance the strength of the nickel component, it is more preferable to use manganese in a range of 1% in addition to the above-mentioned iron component. It has been found that this contributes to improving extrusion processability and removing impurities during processing. As described above, the present invention provides iron pipe 1 and copper pipe 2.
The first and second joint pipes 3 and 4' are furnace-brazed using a copper-tin brazing material 5, in which the first joint pipe 3 and the iron pipe 1 are joined together. Since the second joint pipe 4' to be joined to the copper pipe 2 is made of copper-nickel alloy material, the temperature of the second joint pipe 4' is about 900℃ due to the nickel component. Because it is difficult to soften even at temperatures in the furnace of The joint pipe 4' is prevented from becoming brittle,
Pipe 3, 4' for strong joint parts using inexpensive brazing material 5
It is extremely useful as it allows the production of

[Brief explanation of drawings]

図面は本発明を説明する為のパイプ要部断面図
である。１……鉄パイプ、２……銅パイプ、３……第１
の接合パイプ、４′……第２の接合パイプ、５…
…鑞材。 The drawing is a sectional view of a main part of a pipe for explaining the present invention. 1... Iron pipe, 2... Copper pipe, 3... 1st
joint pipe, 4'...second joint pipe, 5...
...Brazing material.

Claims

[Claims]

1 First and second steps for joining iron pipe and copper pipe
In the method in which jointed pipes are brazed in a furnace using a copper-tin based brazing material, the first jointed pipe to be joined to the iron pipe is made of iron material, and the first jointed pipe to be joined to the copper pipe is soldered in a furnace. A joint component for dissimilar metal pipes, characterized in that a copper-nickel alloy material is used for the second joint pipe.