PRODUCTION OF ALUMINUM HEAT EXCHANGER

摘要

PURPOSE:To prevent the buckling of fins and to produce a titled heat exchanger having an exact shape and size and light weight by using bare materials for tubes and fins, disposing a specific brazing filler metal between the tubes and the fins and brazing these materials. CONSTITUTION:The extruded multi-hole tubes 1 consisting of the bare material are formed zigzag and the fins 6 of the bear material are worked to a currugated shape. The Al-Si alloy brazing filler metal 7 formed by sticking a slight amt. of a mixture composed of 1 or >=2 kinds of potassium fluoroaluminate complex salts, for example, KAlF4, K2AlF5 and K3AlF6 as a flux thereto and drying the same and 20-100mum thickness is disposed between the tubes 1 and the fins 6 in the stage of disposing the fins 6 between the tubes 1. The assembly is heated in a non-oxidizing atmosphere and is thus brazed.