Patent ID: 6325141
Filing Date: 2001-12-04
Classification: B21C,F28D,F28F,Y10T

Abstract:
A tube constituted by inserting an inserting section formed along one edge of a sheet-like workpiece into a grooved section formed by bending the other edge of the sheet-like workpiece in a groove shape and by bonding both the sections together by a brazing to define a tube body for allowing a fluid to pass therethrough, whereinthe grooved section comprises a pair of opposed first and second side wall portions and a connecting portion for connecting both the first and second side wall portions to define a generally U-shaped cross-section, and is disposed inside of the tube body;the second side wall portion being integral and contiguous with an inner wall of the tube body, while the first side wall portion is not integral and contiguous with the inner wall of the tube body;the first side wall portion having a plurality of first projections extending therefrom away from the connecting portion, and;a tip end of the first projection abutting an inner wall of the tube body opposed to the connecting portion.