| 摘要 |
PURPOSE:To make sure joining and to reduce the time for joining by imposing an annular brazing filler metal to the flared step part of the 1st refrigerant pipe then fitting the end of the 2nd refrigerant pipe into said part and heating the flared part of the 1st refrigerant pipe. CONSTITUTION:The annular brazing filler metal 3 is imposed on the flared part 1 of the 1st refrigerant pipe 2 and the end of the 2nd refrigerant pipe 4 is fitted therein. The extreme end 1b in the flared part of the pipe 2 is heated simultaneously on both sides by a 2-nozzle burner, etc. The brazing filler metal 3 is melted to spread over the entire surface between both pipes 2 and 4 and begings to overflow from the spacing. The molten brazing filler metal cools to solidify and the pipes 2, 4 are joined when the heating of the burner is stopped at this time. The metal 3 is thereby uniformly melted to reach to the entire surface in the spacing between the pipes 2, 4 and therefore the joining by brazing is made sure and the joining time is reduced.
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