COPPER ALLOYS

Good electrical & thermal conductivity (1.5 x Al), resistant to oxidation/fresh/salt water/ammonia free-alkaline solution, and many organic chemical.

Classifieds into 8 (eight) group :

• Coppers
• High Copper Alloys
• Brasses (Cu-Zn)
• Bronzes (Cu-Sn)
• Copper-Nickel (Cu-Ni)
• Copper-Nickel-Zinc Alloys (Nickel Silver)
• Leaded Copper
• Special Alloys

Application : Electrical conductor, water tubing, valves/fittings, heat exchanger and chemical equipment

Consideration to weld :

• Welding Process : Arc Welding (GTAW, GMAW, Plasma Arc, SMAW), Oxyacetylene Welding, Resistance Welding, Brazing, Soldering, & Other Welding 
•  Filler Metal : see table below 
• Preheat :  depend on thermal conductivity (Copper is high, Copper Alloy is low) and metal thickness. Over heating by high welding current should nor be used (will cause weld metal overheat, rough bead surface, undercut, porosity & oxide inclusion) 
•  PWHT : usually required if the base metal can be strengthened by heat treatment (high copper, copper aluminum alloys, copper-nickel castings containing Beryllium) or if service environment can cause stress corrosion cracking (high zinc brasses, manganese bronze, nickel manganese bronze, aluminum bronzes and nickel silver)
  Type of PWHT : Stress Relieve & Annealing  (for hardening purpose)

copper alloys filler metal

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