Postalloy® 218HD Tubular Electrode
Postalloy® 218HD produces a multi-carbide weld deposit that resists many types of wear. The weld-deposit is a tightly packed, dense, inter-connected network of chromium carbides, vanadium carbides, molybdenum carbides, niobium carbides and tungsten carbides. Weld deposits offer exceptional wear resistance to general abrasion, high stress grinding, low stress scratching and erosion. Impact resistance is limited. This alloy may also be used at elevated temperatures up to 1300 °F (700 °C). First pass hardness is greater than other hardface electrodes - 65Rc on mild steel. Other outstanding features include:
- Easy out-of-position weldability with the 1/4" (6.4mm) diameter
- Excellent AC or DC operation, even on a "buzz box"
- Low amperage and high metal recovery - no slag to chip
- High deposition rates - up to 3 times faster than ordinary electrodes
- Moisture resistant coating, even under severe weather or high humidity
Specifications
Product Type
- Flux-coated Tubular Electrode
Applications
- Solid waste shredder parts
- Agricultural implements
- Earth moving and construction equipment
- Cement mill parts
- Brick making equipment
- Cereal grinding equipment and muller plows
Weld Deposit Properties
- Additional:
- Weld deposits will relief check-crack readily
- Deposit Thickness:
- 2 layers
- Heat Resistance:
- Excellent up to 1500 °F (816 °C)
- Hardness:
- - 65Rc
Welding Parameters
Current Type: DC Electrode Positive , AC
| Amps | Diameter |
|---|---|
| 80-130 | 1/4" (6.4mm) |
| 130-180 | 3/8" (10mm) |
| 180-220 | 1/2" (12.7mm) |
Welding Procedure:
Remove old hardfacing and any fatigued base metal. Postalloy® 250 gouging electrode is useful for this purpose. Preheat from 200-400 °F (93-204 °C) is recommended for steels with a carbon content of .25 to .45. Steels with a higher carbon level should be preheated from 400-700 °F (204-371 °C). Do not preheat austenitic manganese steel. Use a minimum arc length equal to about the diameter of the electrode. Hold the electrode at 90° to the work surface for proper application. Do not apply more than two layers. On manganese or hardened steel, an intermediate or cushion layer of Postalloy® 207 is recommended.
Packaging Options
| Diameter | Standard Packaging |
|---|---|
| 1/4" (6.4mm) | Resealable Plastic Box |
| 3/8" (10mm) | Resealable Plastic Box |
| 1/2" (12.7mm) | Resealable Plastic Box |