... copper, brass, redcopper, bronze, nickel, gold high-conductivity metal weldingSolid solder joint, solder joint resistance is small, no traces ... safe, easy to operate.Welding range:Battery pole piece of metal welding processes: aluminum + nickel, nickel + copper, multi- ... relay, automotive wiring harness, brass sealing and other colored metal welding. For more information ,welcome contact with us !