| 摘要 |
PURPOSE:To provide a thin-walled, light weight heat exchanger by brazing a corrugated material thinner than a certain thickness onto a meandering tube having a brazing material coated or adhered on it. CONSTITUTION:A fin 6 having a wall thickness less than 110mum and a width more than 15mum is held in position by a welding jig in such a manner that it is interposed between a tube 3 which is wound to meander, and such is brought into an oven to vacuum-heat to melt a brazing material on the surface of the tube 3, which completes the brazing between the tube 3 and the fin 6. As the fin 6 has only a core material 1 and does not contain the brazing material 2, silicon 1a in the brazing material does not diffuse into the core material 1 even after brazing. Although there may be a case where a trace silicon may diffuse into parts where a part of the fin 6 is joined with the tube 3, such parts have adequate stiffness and are able to bear the necessary brazing load as they are solidly welded to the tube 3. |
