METHOD OF BRAZING ALUMINUM, AND FLAT TUBE FOR ALUMINUM HEAT EXCHANGER MANUFACTURED BY THE BRAZING METHOD

• Main Authors: HASEGAWA YOSHIHARU, YAMASHITA NAOKI, ITO YASUNAGA, HIRAO KOJI
• Format: Patent
• Language: English
• Published: 29.03.2012
• Subjects: ALLOYS; BLASTING; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; FERROUS OR NON-FERROUS ALLOYS; HEAT EXCHANGE IN GENERAL; HEATING; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a method of brazing aluminum capable of improving bondability when manufacturing flat tubes for an aluminum heat exchanger by brazing by joining to braze a tube material and inner fins.SOLUTION: The method of brazing aluminum joins to braze the tubes containing 2-6% of Si and shaped so that a clad layer of an aluminum two-layer clad material having a clad layer of a thickness of 5 μm or more of an Al-Si based alloy consisting of a remainder Al and impurities is an inner face, and an aluminum inner fin material containing 7.5-12% of Si and cladding an Al-Si based alloy brazing material consisting of a remainder Al and impurities by being assembled so that the clad layer of the Al-Si based alloy and the Al-Si based alloy brazing material are contacted on the one side face of a core material of an aluminum alloy.