| abstract |
A method of manufacturing an aluminum alloy heat exchanger in which a coating material obtained by mixing a Si powder, flux powder and a binder is applied to the surface of a flat multi-walled refrigerant passage tube made of an aluminum alloy extruded material, and an aluminum alloy bead pin is assembled and brazed Wherein the refrigerant passage pipe comprises an aluminum alloy extruded material containing 0.5 to 1.7% of Mn, Si of less than 0.10% and Cu of less than 0.10%, and the remaining Al and inevitable impurities, The fin is a corrugated fin formed by molding an Al-Mn-Zn alloy material. The coating material is a mixture of a compound-based flux powder containing Si powder and Zn, a compound-based flux powder containing no Zn and a binder , And the application amount of the Si powder is 1 g / m 2 to 4 g / m 2, so that the deepest portion of the refrigerant passage tube portion of the heat exchanger manufactured by soldering And the potential is lowered in the order of the coolant passage tube surface, the pin joint fillet, and the fin. |