C470 Naval Bronze
Nominal Chemical
Composition
INTRODUCTION
Aufhauser Naval Bronze is a 1% tin-copper-zinc filler metal. The addition of tin improves strength and corrosion resistance in the weld deposit. Naval Bronze does not provide as high a weld strength as Low Fuming Bronze (RBCuZn-C, C681). A borax-boric acid flux such as Aufhauser Flux600 is generally required. Joint clearances should be 0.002" to 0.005" wide. Preheating may be desirable for some applications. A neutral or slightly oxidizing flames should be used.
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
Brazing or oxyacetylene welding of steel, cast iron, malleable iron, copper-bronze and nickel alloys.
GENERAL INFORMATION
Chemical Composition| Copper | Aluminum | Lead | Tin | Zinc |
|---|---|---|---|---|
| 57.0-61.0 | 0.01 | 0.05 | 0.25-1.0 | Remainder |
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 | 1625 °F (885°C) |
| Solidification | 1610 °F (877°C) |
| Tensile Strength | 55,000 psi, avg. |
| Elongation in 2" | 30% |
| Brinell Hardness | 80 |
SPECIFICATIONS MEET or EXCEED |
| AWS A5.8 Class RBCuZn-A |
| ASME SFA5.8 Class RBCuZn-A |
| QQ-R-571C |
| QQ-B-650 |
| MIL-R-19631B Type RCuZn-A |
| MIL-B-7883 |
STANDARD SIZES AND DIAMETERS
| Diameters | Round Wire | Rod |
|---|---|---|
| 1/32", 1/16", 3/32", | Not specified | 18" |
| 1/8", 5/32", 3/16", | 36" | |
| 1/4", 5/16", 3/8" |
TYPICAL USES FOR ALLOY C470
| Product Category | Product | Reason Category | Reason |
|---|---|---|---|
| Industrial | Brazing Rod and Wire | Conductivity (Electrical) | Electrical Conductivity |