Patent ID: 7207179
Filing Date: 2007-04-24
Classification: B21D,B23K,B23P,F16L,F25B,F28F,Y10T

Abstract:
1. A method comprising: providing a heat transfer pipe including a pipe end part; providing a capillary tube having a tube end part with a diameter smaller than that of said pipe end part of said heat transfer pipe; performing a flaring fabrication process on said pipe end part of said heat transfer pipe to form a cylindrical flared part, having pipe diameter larger than that of an initial pipe diameter of said pipe end part of said heat transfer pipe; performing a flat crushing process that includes flatly crushing in a pipe latitudinal direction only a portion of said cylindrical flared part of said heat transfer pipe to form a pinched part disposed inwardly of a pipe end face of said cylindrical flared part, and a brazing filler material pooling part disposed between said pinched part and said pipe end face of said cylindrical flared part with said brazing filler material pooling part having an inner cross sectional area that is larger than that of said pinched part; inserting said capillary tube into said pipe end part of said heat transfer pipe so that said tube end part of said capillary tube extends within said pinched part; and performing a brazing process that brazes said capillary tube to said heat transfer pipe by flowing brazing filler material into said brazing filler material pooling part.