METHOD OF FABRICATING FINS ON HEAT EXCHANGER TUBES

摘要

Aluminum or aluminum alloy extended heat transfer surface is fabricated on ferrous metal tubes (12). The tubes (12), usually steel, are first coated with a layer (20) of a material compatible with aluminum welding. The coating (20) is usually aluminum or aluminum alloy. The fins (14, 16) are usually spiral fins (14, 16) and they are welded to the coating (20) by laser welding.