UNS/CDA C61800
ALUMINUM BRONZE A2

 


Specifications

AWS A5.7 Class ERCuAl-A2
ASME SFA5.7 ERCuAl-A2
QQ-R-571C, MIL-R-19631B Type MIL-RCuAl-A2
MIL-W-6712
MIL-E-23765/3 (MIL-CuAl-A2)

Description
  Aluminum Bronze A2 is an iron-bearing MIG and TIG filler metal used for joining aluminum bronze of similar composition, silicon and manganese bronze, high strength copper-zinc alloys, some copper-nickel alloys, ferrous metals and dissimilar metals. Dissimilar metal combinations would include aluminum bronze to steel and copper to steel.   Aluminum Bronze A-2 is excellent for building-up or overlaying metal for wear and corrosion resistant surfaces. Weld deposits exhibit high mechanical properties, tensile strength, yield strength and hardness. Most common applications would include marine maintenance and repair welding of ship propellers; pump housings, rigging jacks, piston heads, bearings and many overlay or surfacing applications.

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

 

Cu(1)

Al

Fe

Pb

Si

Zn

Min./Max.

Rem.

8.5-11.0

.50-1.5

.02

.10

.02

Nominal

89.0

10.0

1.0

-

-

-

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

Applicable Specifications

Product

Specification

Electrode, Welding

AWS A5.6

Rod, Welding

AWS A5.13, A5.7, A5.15

Wire

AWS A5.7

Wire, Metallizing

MILITARY MIL-W-6712

 

Common Fabrication Processes
Drawing, Hot forging, Hot pressing

Fabrication Properties

Joining Technique

Suitability

Soldering

Fair

Brazing

Good

Oxyacetylene Welding

Not Recommended

Gas Shielded Arc Welding

Good

Coated Metal Arc Welding

Good

Spot Weld

Good

Seam Weld

Good

Butt Weld

Good

Capacity for Being Cold Worked

Fair

Capacity for Being Hot Formed

Good

Forgeability Rating

50

Machinability Rating

40

 

Physical Properties

 

US Customary

Metric

Melting Point - Liquidus

1913 F

1045 C

Melting Point - Solidus

1904 F

1040 C

Density

0.272 lb/in3
at 68 F

7.53 gm/cm3
@ 20 C

Specific Gravity

7.53

7.53

Electrical Resistivity

79.8 ohms-cmil/ft @ 68 F

13.27 microhm-cm @ 20 C

Electrical Conductivity

13 %IACS @ 68 F

0.076 MegaSiemens/cm @ 20 C

Thermal Conductivity

37.0 Btu · ft/(hr · ft2·o
F)at 68F

64.0 W/m · o
K at 20 C

Coefficient of Thermal
Expansion

9.0 10-6
per oF(68-572 F)

16.2 ·10-6
per oC(20-300 C)

Specific Heat Capacity

0.09 Btu/lb/o
F at 68 F

377.1 J/kg · o
K at 293 K

Modulas of Elasticity
in Tension

17000 ksi

117000 MPa

Modulus of Rigidity

6400 ksi

44130 MPa


Typical Uses

Industrial
Welding Rod, Bushings, Bearing Liners, Pickling Hooks, Shafts, Welding Wire, Tie Rods, Bearings, Pump Impellers
Marine
Marine Hardware