Abstract
The tube-header joint in heat exchangers for automobiles requires to fill the clearance perfectly. Effects of factors such as clearance geometry, Si content in Al–Si braze alloy and brazing temperature etc. were examined in the fluoride flux brazing by clearance fillability test. Clearance geometry, especially clearance width was the most dominant for fillability. In the same clearance width, fillability increased with higher Si content in braze alloy and higher brazing temperature. Further, excellent fillability was obtained even in lower brazing temperature at 580°G in the Al–Si braze alloys containg Zn or Cu. The results were discussed in terms of flowability of the filler, that is, the fraction of the liquid at the temperature.
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