| 摘要 |
PURPOSE: A joining pipe for brazing is provided to obtain a uniform brazing strength as filler metal is regularly penetrated by consistently maintaining a gap of the welded portions of the pipe bodies by straight projecting the pipes. CONSTITUTION: A joining pipe for brazing comprises an expanded pipe body(10) and a projection pipe body(30). The expanded pipe body comprises a trumpet-shaped expanded portion(11) and a linear expanded portion(12). The linear expanded portion is formed in the lower part of the trumpet-shaped expanded portion. The projection pipe body is fitted into the inside of the expanded pipe body and comprises linear projections(31) and annular projections(32). The linear projections are radially formed in the outer periphery of the front end portion of the projection pipe body along an axial direction. The linear projections prevent the projection pipe body from being tilted in the inside of the expanded pipe body. The annular projections are formed into a shape in correspondence to the size of a void around an inlet so that filler metal(22) is saved as much as the volume of the annular projections. [Reference numerals] (AA) Detailed "A"; (BB) Detailed "B" |
