C656 Silicon Bronze


INTRODUCTION

Aufhauser 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. The oxyacetylene gas flame should be slightly oxidizing. Keep the weld puddle small in order to promote fast solidification and to minimize cracking. A high boric acid flux such as Aufhauser Flux600 should be used both before and during welding. Preheating is NOT recommended.

ADVANTAGES

  • Joints are made at lower temperature than in gas or arc welding
  • Minimizes thermal stress and distortion
  • Less susceptibility to cracking
  • Soft and ductile weld deposits
  • Easy machinability
  • Low residual stress
  • High strength fillets
  • Mobile equipment for simple on-site repair

METALS TO BE BRAZE WELDED

  • Steels, cast irons, copper alloys, nickel alloys and stainless steel

APPLICATIONS

  • MIG, TIG and oxyacetylene welding of copper, copper-silicon and copper-zinc base metals to themselves and to steel
  • Surfacing areas subject to corrosion

GENERAL INFORMATION

Chemical Composition
Copper Zinc Tin Manganese Iron Silicon Aluminum Lead Others
Remainder 1.0 1.0 1.5 0.50 2.8-4.0 0.01 0.02 0.50

Note: Copper contains Silver. All values are maximum percentage, unless shown in range.

ADDITIONAL INFORMATION

Copper and its alloys require a relatively high heat input with shortened welding time. Higher preheat temperatures and faster welding rates than for steel are necessary.

PHYSICAL and MECHANICAL PROPERTIES
Melting Point 1866°F (1019°C)
Solidification 1904°F (1904°C)
Density at 68°F 0.308 lbs./in³
Electrical Conductivity at 68°F 7.0 %IACS (annealed)
Thermal Conductivity at 68°F 21 Btu
Tensile Strength 50,000 psi, min.
Elongation in 2" 65%
Brinell Hardness 80-100
 
SPECIFICATIONS MEET OR EXCEED
AWS A5.7 ERCuSi-A
ASME SFA5.7
QQ-R-571C
MIL-R-19631B Type MIL-RCuSi-A
MIL-E-23765/3 (MIL-CuSi)

 

STANDARD SIZES AND DIAMETERS
Size Cast
(12" Spool)
Helix
(12" Spool)
3/32 or 1/8 x 36" rod N/A N/A
0.035" dia. x 30 lb. spl 15-40" < 1"
0.045" dia. x 30 lb. spl 15-40" < 1"
0.062" dia. x 30 lb. spl 15-40" < 1"

 

GMAW (MIG) Parameters (DC Reverse Polarity) Electrode Positive Spray transfer
Wire Diameter Amps Volts Argon (cfh) Wire Feed (ipm)
0.030" 130-150 21-23 25 460-500
0.035" 145-185 23-25 30 400-440
0.045" 195-215 26-28 30 280-310
1/16" 260-280 27-30 40 150-210

 

GTAW (TIG) Parameters (DCSP)² Electrode negative or ACHF
Material 2% Thoriated² Filler Wire Size Amps (DC) Amps (AC) Gas Cup Argon (cfh)
1/16" 1/16" 1/16" 70-150 70-150 3/8-1/2 15
3/32"-1/8" 3/32" 3/32" 150-200 140-230 7/16-1/2 15
3/16"-1/2" 1/8" 3/32"-1/8" 230-400 225-320 7/16-1/2 20
1/2"-1" 3/16" 3/16"-1/4" 325-500 290-485 1/2 25

 

TYPICAL USES FOR ALLOY C656
Product Category Product Reason Category Reason
Industrial Welding Rod, Filler Metal Brazing Characteristics Fluidity
  Welding Rod, Filler Metal Conductivity (Electrical) Electrical Conductivity
  Welding Rod, Filler Metal Conductivity (Thermal) Thermal Conductivity
  Welding Rod, Filler Metal Mechanical Properties Moderate to High Strength

 

 

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  • Address:
    Aufhauser Corporation
    39 West Mall, Plainview, NY 11803 USA

  • Phone: +1-212-246-0205

  • Email: sales @ brazing.com

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