Roll Seam Welding (Stitch Welding)

With roll seam welding, weld rolls assume the task of the electrode and the pressure tool.  A copper wire is guided between the rolls and the work piece while simultaneously providing a constant high quality weld seam.  The copper wire allows for minimal wear to the weld rolls.  Welding spots are set closely by the rolls to allow for a continuous leak proof seam.  The pulse frequency of the current determines the spot weld spacing.  For tack welding the spots are set further apart.

If a completely leak proof seam is required then the frequency is increased and a continuous seam is created.  Movement can take place during the welding process between the work pieces and the roll electrodes as a result from the rotating electrodes in roll seam welding.  This allows for the creation of a safe leak proof weld seam.

Deviations may occur when a work piece is moved and will not have a detrimental effect on the quality of the weld seam.  In order to keep abrasion and wear on the expensive weld rolls at a minimum to ensure a constant high quality weld seam, we exclusively use roller heads with wire intermediate electrodes in our welding applications.

Soutec is a worldwide leader in seam welding of sequential spot welds for which the place of the spot welded electrodes is taken by the roller electrodes.