Class: ERCuSi-A

AWS: A5.7

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

Silicon Bronze: Mig Welding Process (GMAW)

AWS Chemical Composition Requirements
Cu = Remainder	Zn = 1.0 max
Sn = 1.0 max	Mn = 1.5 max
Fe = 0.50 max	Si = 2.8 – 4.0
Al = 0.01 max	Pb = 0.02 max
Other = 0.50 max

 

Available Sizes
Diameter X Spool Sizes	Diameter X Coil Sizes
.035 x 30#	1/16 x 60#
.045 x 30#	3/32 x 60#
1/16 x 30#	1/8 x 60#

Application
Use for welding of Silicon Bronze Copper, or Aluminum Bronze of low aluminum content. It can also be used for brazing malleable iron and light gauge steel.

Deposited Chemical Composition % (Typical)
Dependent on weld process

(Nominal) All Weld Metal Properties Requirements
Tensile Strength                                          50,000 psi

Recommended Welding Parameters
Process	Diameter of Wire	Voltage (V)	Amperage (A)	Gas	Feed
MIG	.035 inches	20-26	100-200	100% Argon or 75% Argon, 25% Helium	45-55 CFH
GMAW (DCEP)	.045 inches	22-28	100-200	100% Argon or 75% Argon, 25% Helium	45-55 CFH
	1/16 inches	29-32	250-400	100% Argon or 75% Argon, 25% Helium	45-55 CFH
	3/32 inches	32-34	350-500	100% Argon or 75% Argon, 25% Helium	45-55 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.