Double wall nickel or nickel alloy coated stainless steel tubing

摘要

Tubing material (10) is rolled into a double wall tubular member (34) to form a vehicle fluid line. The tubing material includes a stainless steel sheet metal (12) having a nickel or nickel alloy coating. The double wall tubing member is then heated to a brazing temperature to melt the nickel or nickel alloy coating (14, 16) and secure the tubing material into the double wall shape. A cooling process may be used to obtain desired mechanical properties.