| 摘要 |
PURPOSE:To ensure the brazing between beads themselves and to secure the pressure resistance by supporting with a jig so as to form a gap between the lower parts of a flat tube and a tube insert hole and brazing. CONSTITUTION:At the time of laying a laminated heat exchanger sideward on a belt conveyor 18, the push-up jig 19 is arranged at the lower side of each flat tube 2 so as to be supported by uniformly pushing upward to a header tank 4. Each tube 2 is brazed under condition in which the gap 20 is formed between the joining parts 14 positioned at the lower part of the flat tube 2 and the lower end surface in the tube insert hole, i.e., the other end surface in the width direction of the tube insert hole. At the time of brazing, a brazing filler metal on the outer surface of the flat tube 2 flows downward and the gap 20 formed between the lower sides of the flat tube 2 and the tube insert hole is buried and the brazing between the flat tube 2 and the tube insert hole is surely executed. |
