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Tubular Electrodes Product Reference View detailed information about Postalloy® Hardfacing Products
POSTALLOY®
221HD
Description
POSTALLOY® 221HD is a Tungsten Carbide based product with no Chromium Carbide. It produces a very smooth weld deposit with improved impact resistance over pure Tungsten Carbide. The unique product also provides some corrosion protection but primarily helps to provide a high polish in service to reduce the coefficient of friction. When protection against severe abrasion, with limited impact, is needed, POSTALLOY® 221HD is an ideal choice. 
   • Easy out-of-position weldability with the 1/4" diameter
   • Excellent AC or DC operation, even on a "buzz box"
   • Low amperage and high metal recovery - no slag to chip. POSTALLOY® 221HD is over 90% efficient.
   • High deposition rates - up to 3 times faster than ordinary electrodes
   • Moisture resistant coating, even under severe weather or high humidity POSTALLOY® 221HD is slightly less brittle than 220HD.
Specifications
Product Type
Flux-coated Tungsten Carbide Tubular Electrode 

Weld Deposit Properties
Average 2 Layer Hardness
 68Rc
Tungsten Carbide Hardness
75Rc
Deposit thickness
2 layers
Relief checks readily to prevent stress build-up.

Applications
Conveyor screws and augers
Cutter and dredge teeth
Mixer paddles and blades
Shredder and anvil knives
Bucket pin ends
Coal and cement fans
Tamping tools

POSTALLOY® 221HD    Welding Parameters
Current: AC or DC Reverse Polarity
Diameter
Amps
1/4" (6.0mm)
80-130
3/8" (9.5mm)
140-190
1/2" (12.7mm)
180-220

Welding Procedure
Remove old hardfacing and any fatigued base metal. POSTALLOY® 250 gouging electrode is useful for this purpose. Preheat from 200-400ºF (93-204ºC) is recommended for steels with a carbon content of.25 to .45. Steels with a higher carbon level should be preheated from 400-700ºF (204-371ºC). Do not preheat austenitic manganese steels. Use a minimum arc length equal to about the diameter of the electrode. Hold the electrode at 90º to the work surface for a 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" (6.0mm)
Resealable Plastic Box
3/8" (9.5mm)
Resealable Plastic Box
1/2" (12.7mm)
Resealable Plastic Box