Abstract
Joining process is one of the major steps in the manufacturing of stainless steel bipolar plates (BPPs). In this paper, the resistance seam welding method with a capacitor discharge (CD) welding machine is used for welding the metallic bipolar plates of polymer electrolyte membrane (PEM) fuel cells. For welding, the curved paths in the surroundings of the BPPs, ball electrode is used on the positive side of the welding machine and electrode wheel is used for welding the short straight paths inside the flow field channels. Weld seam quality and leakage resistance are examined with the peel test and pillow test. Eventually, according to the results of the peel and pillow tests, the optimum welding parameters for welding a BPP are determined. Finally, two halves of a BPP with parallel serpentine channel flow field are welded together by resistance seam welding method.
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