| 摘要 |
PURPOSE:To stabilize a brazing sheet by using an Al alloy consisting of specified amts. of Cu, Mn and Mg and the balance Al as a core material, forming an intermediate layer of pure Al (Al alloy) belonging the JIS 1XXX type on one side or both sides of the core material and cladding the layer with an Al-Si alloy brazing material. CONSTITUTION:An Al alloy consisting of 0.1-1.0wt.% Cu, 0.3-1.5wt.% Mn, 0.1-1.0wt.% Mg and the balance Al with inevitable impurities is used as a core material. An intermediate layer of pure Al or an Al alloy belonging to JIS 1XXX type is formed on one side or both sides of the core material and clad with an Al-Si or Al-Si-Mg alloy brazing material to obtain an Al brazing sheet. Fins 5 are arranged in a tubular body 4 obtd. by working and assembling the brazing sheet and they are brazed to produce a core for a drawn cup type oil cooler. Brazability is stabilized, the amt. of the brazing filler metal used can be reduced and the sheet can be made thin. |
