METHOD OF MAKING A TUBE FOR A HEAT EXCHANGER

摘要

Production economy in the manufacture of dimpled, flattened tubes for heat exchangers is achieved in a method including the steps of: a) providing an elongated strip of aluminum based material having opposed edges and a braze alloy on only one side thereof; b) forming dimples in the strip such that the dimples project to the side of the strip opposite the strip one side and the dimples on one sid e of a predetermined fold line located between opposed edges will align with the dimples on the other side of the fold line; c) placing slits extending through the strip at the apexes of the dimples on at least one side of the fold line; d) folding the strip along the fold line and bringing the edges into contact with one another while causing the apexes of aligned ones of the dimples to abut one another; e) welding the edges to each other to form a tube; and f) causing the braze alloy to flow from the strip one side through the slits to the interior of the tube and braze the apexes of the aligned dimples together.