seam welding derives directly from the spot welding.
It consists in fact in the realization of a series of contiguous points,
that can be periodically overlapped (watertight welding) or
This result is obtained using circular electrodes (seams), of which at
least one put in rotation by an appropriate motor.
The welding speed, the conduction times, the current value and
the force between the electrodes are adjustable to obtain
the characteristics demanded in function of the nature, of the thickness
and the shape of pieces to weld.