Postalloy® TungGuard™ 299-MCO

Postalloy® TungGuard™ 299-MCO is an open-arc hardfacing overlay that utilizes a specially formulated tungsten carbide to produce a "highly feathered" microstructure that is unusually hard and more abrasion resistant than standard tungsten carbide hardfacing wires. Operates at lower than normal currents to minimize dilution and help develop its high hardness and unique microstructure in the first layer. For extreme earth abrasion resistance with little or no impact.

Please visit our dedicated Tungsten Carbide Hardfacing website here for more information.


Product Type

  • Tungsten Carbide Wire
  • Metal-cored
  • Open-arc
  • Wire


  • Scraper blades
  • Bulldozer blades/end bits
  • Grader blades/bits
  • Stabilizers
  • Mixer screws
  • Feed screws
  • Fan blades
  • Concrete mixer paddles

Weld Deposit Properties

Tungsten carbide hardness - 2300 HV
Average hardness of weld deposit matrix alloy:
Deposits will readily relief check-crack
Deposit Thickness:
Maximum 2 layers

Welding Parameters

Current Type: DC Electrode Positive

Volts Amps Diameter Stick Out
23-26 120-240 1/16" (1.6mm) 1"-1½" (25-38mm)
23-26 250-350 3/32" (2.4mm) 1½" (38mm)

Welding Procedure:

Packaging Options

Diameter Standard Packaging
1/16" (1.6mm) 25 lb spool (11.30kgs)
3/32" (2.4mm) 55 lb coil (25kgs)