A method and a system for resistance seam welding of a foil and at least
one foil support of a fuel cell system. During welding, the thin foil,
together with the thicker foil support, is moved relative to the roller
electrode while resting on a flat support element. In a suitable welding
system, a counter-electrode is designed as a flat support element, such
as a welding strip, that is displaceable relative to the roller
electrode, the roller electrode being in rolling contact with the foil
support, but not with the foil. Depending on whether one foil is to be
welded to one or two foil frames, the support element may be designed
having a high or a low specific electric resistance.