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碳化钨耐磨堆焊
Tungsten Carbide Hardfacing 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.
• 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
Applications
Conveyor screws and augers
Cutter and dredge teeth
Mixer paddles and blades
Shredder and anvil knives
Cutter and dredge teeth
Mixer paddles and blades
Shredder and anvil knives
Bucket pin ends
Coal and cement fans
Tamping tools
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
