Flat bent tube-type heat exchanger for production of car radiators has tubes made from strip of bent sheet, the surface of which is coated with silicon-containing aluminum-based brazing alloy, to provide a joint between tubes and inserts

摘要

Heat exchanger comprising alternating stack of flat tubes having two opposite main walls and corrugated inserts whose peaks contact the main walls is obtained by producing tubes from strip of bent sheet, at least one surface of which is coated with 8.2 wt.% silicon-containing aluminum-based brazing alloy, to provide a joint between tubes and inserts, and/or continuity of peripheral walls of tubes. The corrugated inserts are preferably free of brazing alloy. Both surfaces of the bent sheet can be coated with the alloy, or one surface can be coated with the alloy and the other surface can be covered with an anticorrosion coating.