A flat tube for a heat exchanger

A flat tube for a heat exchanger for a flow of a fluid therein,

• the flat tube comprising:
• a sheet metal strip having a length,
• wherein the flat tube is formed by bending the sheet metal strip along its length,
• wherein the metal strip comprising longitudinal edges;
• a first wall,
• a second wall parallel to the first wall (3),
• wherein said walls being substantially flat;
• and
• two complementary side wall portions joining said first and second walls together,
• wherein the first wall comprises:
• a seam extending along a longitudinal axis of the flat tube so that juxtaposed longitudinal edges of the metal strip join together in parallel manner towards the second wall (4) to form a closed profile of the tube, the seam comprises:
• a first section;
• and
• a second section arranged in series with respect to the first portion of the seam,
• wherein the sections being spaced apart from the second wall and extending along the seam along the longitudinal axis of the flat tube,
• wherein the second wall comprises:
• at least one deflection protruding towards the seam, so that the first section is in contact with the second wall whereas the second section remains spaced apart from the second wall.