UNS/CDA C65600
SILICON BRONZE

 


Specifications

AWS A5.7 ERCuSi-A, AWS A5.27 RcuSi-A
ASME SFA5.7 ASME SFA 5.27 ERCuSi-A
QQ-R-571C, MIL-R-19631B Type MIL-RcuSi-A
MIL-E-23765/3 (MIL-CuSi)

Description
 Silicon Bronze is a copper based filler metal containing 3% silicon and small amounts of manganese, tin and zinc. Primarily used for MIG, TIG and oxyacetylene welding of copper, copper-silicon and copper-zinc base metals to themselves and to steel. Excellent for plain or galvanized steel sheet metal as well as other coated steels.   Silicon Bronze is also used for surfacing areas subjected to corrosion.
 The oxyacetylene gas flame should be slightly oxidizing. Keep the weld puddle small in order to promote fast solidification and minimize cracking. A high boric acid flux should be used both before and during welding. Preheating is NOT recommended.

Chemical Composition
(%max., unless shown as range or min.)

 

Cu(1)

Al

Fe

Pb

Mn

Si

Sn

Zn

Min./Max.

Rem.

.01

.50

.02

1.5

2.8-4.0

1.5

1.5

Nominal

96.6

-

-

-

-

3.4

-

-

(1) Cu value insludes Ag.
Note: Cu + Sum of Named Elements, 99.5% min.

Applicable Specifications

Product

Specification

Electrode, Welding

AWS A5.6

Rod, Welding

AWS A5.27, A5.7

 

Common Fabrication Processes
Welding
Industrial
Welding Rod, Filler Metal