ERCu

Class: ERCu
AWS: A5.7

Conforms to Certification: AWS – 5.7 | ASME SFA A5.7

Copper: Tig Welding process (GTAW)

AWS Chemical Composition Requirements
Cu + Ag = 98.0 Sn = 1.0 max
Mn = 0.50 max Si = 0.50 max
P = 0.15 max Al = 0.01 max
Pb = 0.02 max Other = 0.50 max

Available Sizes
.035 x 36
.045 x 36
1/16 x 36
3/32 x 36
1/8 x 36
3/16 x 36
5/32 x 36

Application
This weld material is used to fabricate deoxidized copper and repair weld copper castings. Both the gas metal arc and gas tungsten arc weld processes can be used. Can also be used to weld galvanized steel and deoxidized copper to weld steel where high strength joints are not required.

Deposited Chemical Composition % (Typical)
Dependent on weld process

(Nominal) All Weld Metal Properties
Tensile Strength 8,000 psi
Yield Strength 29,000 psi
Elongation 29%
Reduction of Area 45%

Recommended Welding Parameters

Process Diameter of Wire Voltage (V) Amperage (A) Gas Feed
TIG – GTAW 1/16 inches x 36 –0– 70-120 100% Helium or 100% Argon 40-55 CFH
3/32 inches x 36 –0– 120-160 100% Helium or 100% Argon 40-55 CFH
1/8 inches x 36 –0– 170-230 100% Helium or 100% Argon 40-55 CFH

Preheat / Interpass Recommendations
Preheating copper – base alloys is frequently unnecessary provided section thicknesses are not unusually heavy.
Preheat and Interpass temperatures will vary depending on section thickness, selected weld process and other variables.