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Shield-Bright 309L X-tra was developed for the welding of stainless steels to carbon or low alloy steels and the first layer cladding of carbon and low alloy steels. It was developed for welding in the flat position and horizontal fillet welds with flat to concave beads with excellent slag removal. For joining thick sections, it is preferred the non-stainless steel be buttered with a layer of Shield-Bright 309L X-tra and the joint completed with Shield-Bright 316L X-tra or 308L X-tra. The service temperature should not exceed approximately 750°F (399°C).