JOINING METHOD OF PERFORATED PIPE AND UNION OF HEAT EXCHANGER

摘要

PURPOSE:To seal and join surely with pressure-fitting a solder to the joining part of a union and perforated pipe by pressing and heating a brazing sheet after overlapping the brazing sheet covered with a solder on the plane face of union and fitting-in the end part of a perforated pipe. CONSTITUTION:A perforated pipe 1 is fitted to the connection aperture 4 of the union 2 after fitting in the perforated pipe 1 into the fitting aperture 7 of a brazing sheet 6 and a heat exchanger is incorporated by pressing the brazing sheet 6 to the plane face 5 of the union 2 by an adequate jig. It is then heated at the prescribed temp. and for the prescribed time with pressing to the union 2 by inserting into the furnace of nitrogen gas atmosphere and by applying the prescribed pressure from the above of the brazing sheet 6. The brazing material 8 cladded to the brazing sheet 6 is thus press-fitted and joined by being pushed out to the joined part of the plane face 5 and fitting aperture 7 of the brazing sheet 6 and union 2 and the outer peripheral face of the perforated pipe 1 and the connection aperture 4 of the union 2, etc. by the press of the brazing sheet 6 without using a flux. The pressure resistant force and airtightness of the soldered part are thus obtd.