Cobalt #1 CTD Electrode
Class: ECoCr-C
AWS: A5.13
DURAMAX COBALT #1 CTD ELECTRODE
Conforms to Certification: AWS A5.13 | ASME SFA 5.13
Weld Process: Shielded Metal Arc
| AWS Chemical Composition Requirements | ||
| C = 1.7 – 3.0 | Mn = 2.0 max | Si = 2.0 max |
| Cr = 25 – 33 | Ni = 3.0 max | Mo = 1.0 max |
| Fe = 5.0 max | W = 11.0 – 14.0 | Co = Remainder |
| Other = 1.0 max | ||
Product Description:
DMCobalt#1 SMAW is a stick electrode that has the highest hardness of the cobalt alloys. The composition is such that primary hypereutectic carbides are found in the microstructure. This characteristic gives the alloy higher wear resistance, accompanied by reductions in the impact and corrosion resistance. The higher hardness also means a greater tendency to stress crack during cooling. This cracking tendency may be minimized by closely monitoring preheating, Interpass temperature and post heating techniques. While the CoCr deposits soften somewhat at elevated temperatures, they normally are considered immune to tempering. Used to build up mixer rotors and items that encounter severe abrasion and low impact.
| Typical Applications: |
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| – Wear Pads | – Mixer Rotors | – Pump Sleeves | |
| – Burner Nozzles | – Kneading Rolls | – Drawing Blocks | |
| – Hot Rolls & Rolling Guides | – Screw Presses | ||
| Deposited Chemical Compositon % (Typical) | |||
| C = 2.1 | Mn = 0.6 | Si = 0.60 | |
| Cr = 28.1 | Ni = 2.4 | Mo = 0.10 | |
| Fe = 4.1 | W = 12.3 | Co = Balance | |
| Typical Deposit Characteristics: |
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| – Abrasion Resistance | Excellent | – Hardness | HRC 43 – 58 |
| – Impact Resistance | Fair | – Hot Weld Hardness | Excellent |
| – Corrosion Resistance | Good | – Deposit layers | 2 Layers Max |
| – Magnetic | No | – Deposit Cross Check | Possible Cracking |
| – Machineability | Carbide tools | – Proper Heat Treatment | & Slow Cooling |
Recommended Operation of Welding Rods
Flat Welding
| Diameter | Amps DCEP |
| 1/8 | 90 – 120 |
| 5/32 | 145 – 165 |
| 3/16 | 175 – 195 |