The SDPR HF800 roller welder is made of machined electro-welded sheet and structural steel which underwent severe normalization treatments so that high precision, excellent rigidity and resistance to stress can be ensured.

Roller holding heads with rolling bearings, friction contacts machined which ensure a proper electric contact for the welding current, cooled by cooling liquid circulation. The heads are moved by a three-phase asynchronous motor activated by an inverter to precisely regulate welding speed and movement. Water cooled and vacuum impregnated transformer to ensure sport-welding continuity. MICRO8 Rulli weld control board of synchronous type with a microprocessor controlled in 5 steps. It controls timing which is synchronous with the network frequency, of the various phases of the cycle (docking, welding, cold time and maintenance) and the regulation of welding current by digital measuring. Spot-welding can be continuous or pulsed. It offers the dual program as standard. Multi-turn potentiometer for the adjustment of the roller rotation speed with the possibility of reversing. 1000Hz control frequency inverter generator for medium frequency transformers. The compact device allows to control the primary current of the power transformer keeping its value constant regardless of the variations in the mains voltage and any thermal and aging drifts of the different components of the system. The working frequency of 1KHz allows to reduce the dimensions of the transformer and to improve the form factor of the output current by reducing the ripple of the current and allowing the creation of more controlled welding points both in terms of time and maximum current. The inverter control board interfaces with the remote unit such as MICRO8 or J-TEK provides the welding parameters and sends error codes to manage diagnostics in the event of anomalies.