Your Global Resource for Industrial Hardface Technology and Wear Resistant Technologies
Product Reference View detailed information about Postalloy® Hardfacing Products
Enter Search Phrase
Postalloy® 
220HD
Description
TUNGSTEN CARBIDE TUBULAR ELECTRODE
Postalloy® 220HD contains increased levels of tungsten carbide compared to Postalloy® 219HD, with additional chrome and cobalt for toughness. The unique blend of Tungsten Carbide and Chrome provides a high polish in service to reduce the coefficient of friction. When protection against severe abrasion is needed, Postalloy® 220HD is an ideal choice.
   â€¢ Easy out-of-position weldability with the 1/4" diameter
   â€¢ Excellent AC or DC operation, even on a "buzz box"
   â€¢ Low amperage and high metal recovery - no slag to chip. Postalloy® 220HD is over 90% efficient.
   â€¢ High deposition rates - up to 3 times faster than ordinary electrodes
   â€¢ Moisture resistant coating, even under severe weather or high humidity
Specifications
Product Type
Flux-coated Tubular Electrode alloyed with Tungsten Carbide, Cobalt and Chrome

Weld Deposit Properties
Average 2 Layer Hardness  
64-68Rc
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®   220HD    Welding Parameters
 
Current: AC or DC Reverse Polarity
Diameter Amps
1/4" (6.0mm)80-130
3/8" (9mm)140-190
1/2" (12mm)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" (9mm)
Resealable Plastic Box
1/2" (12mm)
Resealable Plastic Box