The SF 16-33 welding machine is a key element of the coldforming fastener production line. It is designed and built to join wire rod hanks and guarantee the continuity of spinning operations in the line. The welding process is developed through a sequence of operations characterised by low energy consumption, operational simplicity, and the elimination of potentially dangerous manual work steps. The use of a mobile welding unit offers the flexibility of welding in different positions and situations, increasing the efficiency and speed of the work.