JPS58207591A - Joining part of metallic pipe of different kind - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining part for dissimilar metal pipes of copper and iron.

Conventionally, in refrigerators, for example, silver solder consisting of silver, copper, and zinc has been used to join the pressure aα side iron pipe of the iron R-s and the steel pipe for the refrigerant conduit, but the silver content W The measurement is done remotely because it is more than 20%, and flux is used.
This requires removal, and incomplete removal may promote corrosion.

For this reason, as shown in the drawing, in order to easily join the compressor side iron pipe (1) and the refrigerant pipe copper pipe (2), a connecting iron made of the same material is placed between the two pipes. pipe(
3) and the joining copper pipe (47), and the joining pipes 131141 are pre-coated in a vacuum furnace or CO/CO2 conversion reducing gas furnace using a copper-tin based brazing material (5), which is cheaper than the silver edge. Six furnace brazing joints were attempted.

However, copper-tin based brazing material (5) has a higher melting temperature than silver, so the temperature in the furnace is about 600°C to about 900°C.
For this reason, both pipes t3i and t4
) At the time of attachment, one of the cap pipes 14 becomes soft and its strength decreases, and the tin of the brazing material (5) diffuses into the copper pipe ~4), making the pipe brittle and causing the pipe to become fragile. There was a risk that it could crack and break due to vibration transmission.

In view of this, Suekan 1!11 prevents the softening of the copper pipe (by using a copper alloy pipe (4) instead of 4!), and also reduces the copper-field shrinkage material. 1
5) This is to prevent the tin from being diffused into the actual copper part of the copper alloy pipe (4).

Next, Table 9J11 shows the strength test results comparing the joint parts using the steel alloy pipe (4) according to the present invention and the joint parts using the porcelain vibrator (4) before the improvement of the present invention. The brazing material (5) in the furnace is 92% copper @8%, f
@Wage pipe (4) is made of 88.5% steel, 10% nickel,
The steel pipe +41 uses 1.5% iron, and the steel pipe +41 uses pure copper.

Table 1 It is preferable to use 0.5 to 15% gel, 0.1 to 2% iron, and the remainder copper. 1 manganese to
It is more preferable to use the manganese within the above range, and it has been found that this manganese contributes to improving the extrusion processability and removing impurities when forming the steel alloy pipe (4)' into a pipe shape.

In addition, copper alloy pipe (4) may be made of iron, chromium, cobalt, silicon, etc., although its extrusion workability is poor as an alloy material of I.

As described above, the present invention includes a steel pipe (2) and an iron pipe (1).
Since I used the furnace brazing material (5), the joint pipe (4) and the iron pipe (3) for the joint and piece, as the parts that take care of this,
Inexpensive mausoleum material (5) for strong joint parts (31 (
4) can be manufactured.

In addition, if a nitrogen-based alloy material is used for a C1 steel alloy pipe, the pipe workability will also be affected, making it extremely difficult to use.

＞

[Brief explanation of the drawing]

The inner surface is a sectional view of the main part of the pipe for explaining the invention. (1)・Iron pipe, +21・−・Copper pipe, (31・
...Iron pipe for joining, (pulling...copper alloy pipe, (51
...Brazing material. Out of stock Sanyo MA Co., Ltd. 1 winter ~ 3, agent Shizuo Amizu Sano・-9・″゛＼＼2,

Claims (1)

[Scope of Claims] 11) A part for joining dissimilar metal pipes, which uses a copper joint pipe and an iron pipe that are furnace-brazed to join a copper pipe and an iron pipe. (21) A joining component for dissimilar metal pipes according to claim 1, in which a copper-chilled alloy material is used for a copper alloy pipe.