Tech-Rod Weld A description: Tech-Rod Weld A electrodes are used for welding of nickel-chromium-iron alloys to themselves as well as for dissimilar welding between various nickel alloys to a steel or stainless steels. These electrodes can also be used to overlay cladding where a similar composition is needed. These electrodes have wide applications ranging from cryogenic temperature up to 1500°F.