C189 Deoxidized Copper
Nominal Chemical
Composition
INTRODUCTION
Aufhauser C189 Deoxidized Copper is a filler metal containing 98% copper and small amounts of phosphorus and silicon. The C189 alloy is easy flowing and produces weld deposits that are porosity free, electrically conductive, and copper-color matched. The oxyacetylene gas flame must be neutral or slightly oxidizing. Tip size must be one to two sizes larger than the base plate. Preheating should be done only if the part is thick. A boric acid or borax flux such as Aufhauser Flux600 is recommended.
APPLICATIONS
- Joining deoxidized copper, electrolytic tough pitch copper and repair weld copper castings with MIG, TIG, and oxyacetylene welding processes
- Welding galvanized steel and deoxidized copper to mild steel where high strength joints are not required
- Overlaying steel surfaces to resist corrosion
- Joining copper pipes, tanks and copper fittings
GENERAL INFORMATION
Chemical Composition| Copper | Aluminum | Phosphorus | Lead | Manganese | Silicon | Tin | Others |
|---|---|---|---|---|---|---|---|
| 98.0 | 0.01 | 0.15 | 0.02 | 0.5 | 0.5 | 1.0 | 0.5 |
PROPERTIES OF BRAZED JOINTS
Generally, the joint strength produced by C189 Deoxidized Copper will surpass the strengths of the base metals. Strength is a function of the base metals being joined, type of joint, design of joint, joint clearances and brazing procedures. The recommended maximum operating temperatures for joints brazed with this alloy is approximately 500°F (continuous service) and 900°F (intermittent service). Corrosion resistance is satisfactory except when the joint is in contact with sulfurous atmosphere (especially at elevated temperatures).
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 | 1967°F (1075°C) |
| Density at 68°F | 0.322 lbs./in³ |
| Electrical Conductivity at 68°F | 30.0% IASC |
| Thermal Conductivity at 68°F | 75.0 Btu |
| Electrical Resistivity at 68°F | 34.6 Ω-cmil/ft |
| Specific Gravity | 8.91 |
| Specific Heat Capacity at 68°F | 0.09 Btu/lb/°F |
| Tensile Strength | 25,000 psi, min. |
| Elongation in 2" | 29% |
| Rockwell F Hardness | 25 |
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" |
SPECIFICATIONS MEET OR EXCEED
| AWS A5.7 Class ERCu |
| ASME SFA5.7 |
| QQ-R-571C, MIL-R-19631B Type MIL-RCu-2 |
| MIL-C-19654 (MIL-RCu-C) |
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" | 1/8"-1/4" | 325-500 | 290-485 | 1/2 | 25 |
FABRICATION PROPERTIES
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Excellent |
| Gas Shield Arc Welding | Excellent |
| Coated Metal Arc Welding | Good |
| Spot Weld | Fair |
| Seam Weld | Not Recommended |
| Butt Weld | Excellent |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Excellent |
| Machinability Rating | 20 |
COMMON FABRICATION PROCESSES
| Welding |
TYPICAL USES FOR ALLOY C189
| Product Category | Product | Reason Category | Reason |
|---|---|---|---|
| Industrial | Welding Rod and Wire | Conductivity (Electrical) | Electrical Conductivity |
| Welding Rod and Wire | Conductivity (Thermal) | Thermal Conductivity | |
| Welding Rod and Wire | Corrosion Resistance | Corrosion Resistance | |
| Ordnance | Artillery Projectile Rotating Bands, Welded | Corrosion Resistance | Corrosion Resistance |
| Artillery Projectile Rotating Bands, Welded | Friction & Wear Properties | Galling Resistance | |
| Artillery Projectile Rotating Bands, Welded | Mechanical Properties | High Strength | |
| Artillery Projectile Rotating Bands, Welded | Welding Characteristics | Weldability |