Stainless welding rod is a consumable metal wire used to join stainless steel, with common types like E308L (for 304/304L), E309L (for dissimilar metals/overlay), and E316L (for 316/316L, marine/chemical use) providing specific corrosion resistance and strength, chosen based on material grade, thickness, welding position, and application requirements, often with low-carbon ("L") versions for better weld quality.