The plate for flattened tube production, production manner of the flattened tube and production manner null of the

摘要

PROBLEM TO BE SOLVED: To provide a flat tube capable of protecting at least one of side walls.;SOLUTION: A flat tube 1 comprises a pair of upper and lower walls 2 and 3 opposed to each other, two side walls 4 and 5 interconnecting the upper and lower walls 2 and 3 at left and right opposite side edges thereof, and a covering wall 6 provided over the outer surface of the left side wall 4 and brazed to the left side wall 4. The left side wall 4 is made from a side wall forming portion 9 projecting downward from the upper wall 2 integrally therewith and a side wall forming portion 11 projecting upward from the lower wall 3 integrally therewith by brazing these portions 9, 11 as butted against each other. The covering wall 6 is made by folding a covering wall forming portion 12 formed by extending one side edge of the upper wall 2.;COPYRIGHT: (C)2006,JPO&NCIPI