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Brass Brazing Welding Rod S221 Brass Filler Metals Welding Wire. Brass Filler Metal: S221 Brass filler metal for brazing copper, steel, and copper-nickel alloys. Versatile Welding Types: Suitable for both gas welding and arc welding applications. No Flux Required: Does not contain flux, ensuring clean slag characteristics. OEM/ODM Support: Customized support available for OEM, ODM, and OBM services. Quality Assurance: Pre-production samples and final inspections before shipment. Fast Lead Time: Off-season lead time within 15 workdays; peak season one month.