Roller seam welding is especially used to join thin sheets. It is another form of resistance welding closely related to spot welding. Hereby the electrodes are formed as copper rolls. The rolls are running atop and below the sheets to join, press them together and simultaneously transfer the welding current. In contrast to spot welding, roller seam welding is a continuous process. The rolls are running over the sheet continuously and are not needed to be opened for the feed. The welding spots are generated by current pulses. The higher the impulse frequency (at the same feed), the closer the welding spots. If the welding current is not interrupted a seal weld can be generated.
We implemented this process in various projects, for example the production of home appliances. For white goods solid seal welds are needed, which can be generated in a high quality with roller seam welding by KUKA Systems. In this way leading home appliance producers in Germany are welding back covers of their dishwashers.