The auto extrusion aluminum tube is also called aluminum high frequency tube. Its manufacturing method is to make the flat aluminum strip into tubes, then connect the edges by high frequency welding process, and then seam weld without using any filler material. Then adjust the size of the welded pipe until the exact size and tolerance are achieved.
The auto extrusion aluminum tube is a kind of composite tube. The main difference between extruded pipe and drawn tube is that the weldable layer can be made of different aluminum alloy materials. The core material is generally 3003, and the composite weldable alloy is 4343 or 4045. It is widely used in heat exchanger production tubes to enable furnace or flame brazing and to provide sacrificial corrosivity.
