Automatic equipment with lathe for double TIG welding with cold wire of flanges on aluminium tubes, diameters between 300 mm e 660 mm and maximum length of 8000 mm. The unit is composed of a machined beam with two moving heads to adjust the length of the pipe to be welded and complete with two lifters, two expanders to lock and centre the flanges and two motorized vertical slides with torch support to adjust the diameter of the pipe to be welded.