Claims
- 1. A method of soldering parts of which at least one is made of aluminum or aluminum alloy, comprising the steps of:
- fluxing the parts to be connected together by means of an organic flux;
- covering at least said fluxed portions with a soldering alloy comprising
- 65-85% lead by weight
- 12-30% cadmium by weight
- 1-6% antimony by weight
- 0.5-1% tin by weight;
- heating said portions up to the liquidus temperature of the soldering alloy while holding said portions together; and
- cooling down to ambient temperature.
- 2. A method in accordance with claim 1 wherein said parts to be connected are portions of heat exchangers comprising heat distributors made of aluminum in contact with circulation tubes made of a metal selected from the group consisting of copper, brass, stainless steel and the like.
- 3. A method in accordance with claim 1 wherein said soldering alloy further contains additives selected among:
- bismuth 0.5-5% by weight
- zinc 0.2-1% by weight
- silver 0.2-1% by weight
- 4. A method in accordance with claim 1 wherein said soldering alloy consists essentially of:
- Pb 79.7 % by weight
- Cd 16.7% by weight
- Sb 2.6% by weight
- Sn 1% by weight
- to give an alloy having solidus-liquidus temperatures of respectively 234.degree. C and 242.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
75.13565 |
Mar 1975 |
FR |
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Parent Case Info
This is a division of application Ser. No. 566,991, filed Apr. 11, 1975, now U.S. Pat. No. 3,969,110 dated July 13, 1976.
US Referenced Citations (6)
Divisions (1)
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Number |
Date |
Country |
Parent |
566991 |
Apr 1975 |
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