| 摘要 |
PURPOSE:To perform completely the holding of liquid tightness of joining part by melting with placing a foil solder on the upper face of the upper side bracket and with placing a string solder on the upper face of the lower side bracket and by flowing the solder thereof into the recessed part of the upper face of the upper and lower brackets. CONSTITUTION:The upper and lower both side parts of each heat transfer tube 1, 1 are penetrated into the through holes 8, 8 of the upper and lower brackets 4a, 4b and tentatively assembled. A foil solder 10 is placed on the upper part bracket 4a and a string solder 11 on the lower side bracket 4b respectively. The solders 10, 11 are melted simultaneously with joining the heat transfer tubes 1, 1 and a fin by heating each member with putting into a heating furnace the tubes 1, 1 and brackets 4a, 4b with solders 10, 11 and the melted solders are flowed into the recessed parts 9a, 9b of each brackets upper face. The solders flowed into the recessed parts 9a, 9b are solidified with cooling after taking off from the heating furnace the tubes and brackets, holding the liquid tightness of the part where each tube 1, 1 penetrates the bracket 4a, 4b.
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