METHOD FOR BRAZING ALUMINUM MATERIAL

PURPOSE:To reduce consumption of fluoride series flux by brazing with high frequency induction heating to joint part of two Al materials while injecting inert gas. CONSTITUTION:At end part of a first Al pipe 1, an expanded pipe part 1a is formed and at periphery of a second Al pipe 2, a ring-like brazing filler metal 3 is fitted and covered, and this end part is inserted into the expanded pipe part 1a of the first Al pipe 1. On the joint part in both pipes 1, 2 and the brazing filler metal 3, the flux is applied. An induction coil 4 in the high frequency induction heating device is set at surroundings of the joint part in both pipes 1, 2 and inert gas injecting pipes 5 forming plural inert gas injecting holes 5a are set at both upper and lower sides of the induction coil 4. The inert gas is injected toward the joint part in both pipes 1, 2, and also, by executing the high frequency induction heating with the induction coil 4, the Al pipes 1, 2 are brazed.