In general, tubes are divided into two large families, depending on the production method: extruded tubes and welded tubes. In the former, a peeled billet is extruded and the tube is obtained, which can then be calibrated using dies and mandrels. In the welding process, a sheet is deformed to the desired shape and then welded along its ends. It is a continuous process, therefore characterized by a much higher productivity, and allows the production of complex pipe shapes with good dimensional tolerances, without the need for subsequent calibration steps.
Diamil designs and manufactures tools and inserts in Hard Metal for the production of welded pipe, used for the preparation of the sheet metal (where necessary), for the removal of the excess welding material (internal and external weld separation) and for the bevelling of the pipe ends before packing.