C681 Low-Fuming Bronze
Nominal Chemical
Composition
INTRODUCTION
Aufhauser C681 Low-Fuming Bronze, with its low melting point, is easily machinable and excellent for sheet metal work. This alloy possesses high tensile strength and good ductility. Weld deposits are non-porous, giving leak-proof joints for water, oil or gas lines. Quick wetting action provides a sound foundation for a dependable weld. The weld deposit rapidly changes from a fluid to a plastic state; it freezes fast. Preheating is required for some applications, and Aufhauser Brazing Flux is generally recommended. Joint clearances from 0.002 to 0.005 in. are suitable. Also available pre-coated with Aufhauser flux.
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
- Production joining applications
- Repairing broken or defective steel and cast iron parts
- Repairing cast iron castings in the foundry
- Machine shops, for correcting machining errors or modifying in-process parts
- Maintenance departments and tool rooms for repairing tools and equipment
- Mobile repair units (grain-harvesting crews, ship repairs)
GENERAL INFORMATION
Chemical CompositionCopper | Aluminum | Iron | Lead | Manganese | Silicon | Tin | Zinc |
---|---|---|---|---|---|---|---|
56.0-60.0 | 0.01 | 0.25-1.2 | 0.05 | 0.01-0.50 | 0.04-0.15 | 0.8-1.1 | Remainder |
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 | 1630°F (888°C) |
Solidification | 1595°F (868°C) |
Tensile Strength | 65,000 psi |
Elongation in 2" | 25% |
Brinell Hardness | 96 |
SPECIFICATIONS MEET or EXCEED |
AWS A5.8 Class RBCuZn-C |
ASME SFA5.8 Class RBCuZn-C |
QQ-R-571C |
MIL-R-19631B Type RCuZn-C |
STANDARD SIZES AND DIAMETERS |
Diameters: 1/16", 3/32", 1/8", 1/4", 3/8" |
Rod Lengths: 18", 36" |
TYPICAL USES FOR ALLOY C681
Product Category | Product | Reason Category | Reason |
---|---|---|---|
Industrial | Welding Rod for Cast Iron | Welding Characteristics | Weldability |