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299-MCO (formerly part 299-SPL)
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.
Product Type
Tungsten Carbide Wire: Metal-cored, open-arc
Deposits are slag-free

Weld Deposit Properties
Tungsten Carbide - 2300 HV
Average hardness of weld deposit matrix alloy  
Deposit Thickness  
2 layers maximum
Deposits will readily relief check-crack  

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

POSTALLOY® 299-MCO    Welding Parameters
Current: DC Electrode Positive
Diameter Amps Volts Stick Out
1/16" (1.6mm)120-240 23-26 1"-1½" (25-38mm)
3/32" (2.4mm)250-35023-261½" (38mm)
Packaging Options
Standard Packaging
1/16" (1.6mm)
25 lb spool
3/32" (2.4mm)
55 lb coil