Patent ID: 8732951

Claim:
Method for manufacturing finned tubes made of metal, in particular heat exchanger tubes, where at least one continuous strip forming the fins is fed tangentially to a tubular body set into rotational motion, and wound onto it in a roughly helical line, the side of the strip facing the tubular body is connected to the tube surface by means of a welding device and using a filler material, the working end of the welding device is guided into the free wedge-shaped gap between the tube surface and the strip to be wound, and the strip to be wound is guided between guide discs just behind the welding area, said discs reaching close up to the tube surface, characterised in that the guide discs are cooled with a cooling liquid and the cooling liquid is fed to the guide discs at a point remote from the welding area and is dosed in such a way that the water component evaporates before reaching the welding area, whereas the welding release agent, which has a higher boiling point than water, only evaporates at or downstream of the welding area.