Postalloy® 21 Flux-coated Electrode
Postalloy® 21 is a self-hardening wear resistant overlay engineered for abrasion and abrasion combined with medium impact. The alloy chemistry provides good resistance to spalling and chipping while the special low hydrogen coating minimizes dilution and helps to eliminate under-bead cracking. Use on carbon and low alloy steels.
Specifications
Product Type
- Flux-coated Electrode
Applications
- Excavator Parts and Bucket Teeth
- Tamping Tools
- Screw Conveyers
- Elevator Bucket Lips
- Dozer and graber blades.
- Post hole augersWear areas on clam shell buckets
- Mining Drag line and shovel buckets
- Earth moving and construction equipment
- Muller tires
- Grader end bits
Weld Deposit Properties
- Additional:
- Also available as a semi-automatic wire - DuraHard™ 2898-MCG or 2898-FCO
- Hardness as deposited:
- 56-60Rc
- Non-cracking with proper preheat and post heat procedures
- Machinability - Best by grinding or machining with special tooling
- Deposit Thickness:
- Unlimited layers with proper procedures
Welding Parameters
Current Type: DC Electrode Positive , DC Electrode Negative AC
| Amps | Diameter |
|---|---|
| 90-135 | 1/8" (3.2mm) |
| 130-160 | 5/32" (4mm) |
| 150-225 | 3/16" (4.8mm) |
Welding Procedure:
Due to lower Dilution. DC Electrode Negative will produce a higher first pass hardness and is also ideal for thin sections. Remove all damaged or fatigued metal. Preheating is generally not required. However, for high carbon or ally steels and cast iron, a preheat of approximately 400 °F (204 °C) is recommended. Maintain a short to medium arc using a weave technique. Remove slag.
Packaging Options
| Diameter | Standard Packaging |
|---|---|
| 1/8" (3.2mm) | Resealable Plastic Box |
| 5/32" (4mm) | Resealable Plastic Box |
| 3/16" (4.8mm) | Resealable Plastic Box |