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UNS/CDA
C61800 ALUMINUM BRONZE A2
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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.)
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Cu(1)
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Al
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Fe
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Pb
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Si
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Zn
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Min./Max.
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Rem.
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8.5-11.0
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.50-1.5
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.02
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.10
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.02
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Nominal
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89.0
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10.0
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1.0
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-
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-
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-
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(1) Cu value includes Ag. Note: Cu + Sum of
Named Elements, 99.5% min.
Applicable Specifications
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Product
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Specification
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Electrode, Welding
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AWS A5.6
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Rod, Welding
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AWS A5.13, A5.7, A5.15
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Wire
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AWS A5.7
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Wire, Metallizing
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MILITARY MIL-W-6712
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Common Fabrication
Processes Drawing, Hot forging, Hot
pressing
Fabrication Properties
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Joining Technique
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Suitability
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Soldering
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Fair
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Brazing
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Good
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Oxyacetylene Welding
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Not Recommended
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Gas Shielded Arc Welding
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Good
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Coated Metal Arc Welding
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Good
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Spot Weld
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Good
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Seam Weld
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Good
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Butt Weld
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Good
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Capacity for Being Cold Worked
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Fair
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Capacity for Being Hot Formed
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Good
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Forgeability Rating
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50
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Machinability Rating
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40
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Physical Properties
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US Customary
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Metric
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Melting Point - Liquidus
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1913 F
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1045 C
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Melting Point - Solidus
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1904 F
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1040 C
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Density
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0.272 lb/in3 at 68 F
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7.53 gm/cm3 @ 20 C
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Specific Gravity
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7.53
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7.53
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Electrical Resistivity
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79.8 ohms-cmil/ft @ 68 F
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13.27 microhm-cm @ 20 C
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Electrical Conductivity
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13 %IACS @ 68 F
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0.076 MegaSiemens/cm @ 20 C
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Thermal Conductivity
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37.0 Btu · ft/(hr · ft2·o
F)at 68F
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64.0 W/m · o K
at 20 C
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Coefficient of Thermal Expansion
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9.0 10-6 per oF(68-572
F)
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16.2 ·10-6 per
oC(20-300 C)
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Specific Heat Capacity
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0.09 Btu/lb/o F at 68
F
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377.1 J/kg · o
K at 293 K
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Modulas of Elasticity in Tension
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17000 ksi
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117000 MPa
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Modulus of Rigidity
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6400 ksi
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44130 MPa
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Typical Uses
Industrial Welding Rod, Bushings, Bearing
Liners, Pickling Hooks, Shafts, Welding Wire, Tie Rods,
Bearings, Pump Impellers Marine Marine
Hardware
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