Copper Chromium Zirconium
Copper Chromium Zirconium C18150, RWMA Class 2, AWS J1.3
Copper Chromium Zirconium Alloy has the addition of zirconium to chromium copper to improve creep resistance at high operating temperatures and reduces sticking of electrodes to the work during spot welding of galvanized/coated materials. C18150 is specified mainly for electrode applications. Copper Chromium Zirconium is an RWMA Class 2 material and is stronger than the RWMA Class 1 materials.
Chemical Compositions of RWMA Materials Group A - Copper Base Alloys | |||||
RWMA Class | UNS Number | Description | Cu | Cr | Zr |
2 | C18150 | Chromium Zirconium Copper | Balance | 0.5 – 1.5% | 0.02 – 0.20% |
Cu: Copper
Cr: Chromium
Zr: Zirconium
Available in Rod, Bar, Plate, Wire/Coil.
Typical usages of RWMA Class 2 Copper Alloy: C18150 is recommended for spot and seam, welding cold and hot rolled steels, coated materials, current-carrying shafts and arms, back-up bars for both resistance and arc welding, and electrical current carrying structural parts.
It is used extensively for cap-style resistance welding electrodes. It can provide less sticking and resistance for much longer than its counterpart copper -chromium in some specific situations.