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Postalloy® 301 is a high strength, ductile, crack resistant welding alloy specifically designed for welding problem steels such as, low alloy, high carbon or crack sensitive tool steels. Ideal for welding dissimilar steels- low alloy, spring steels, carbon steels, tool steels. The benefits of Postalloy® 301 include:
• Excellent joining characteristics - With the combination of balanced alloy chemistry and high strength, crack resistant weld deposits, the capability to weld dissimilar problem steels is outstanding.
• Carbon has no adverse effects - Carbon, the cause of most problems associated with weld cracking and hard spots, is rendered harmless.
• Acts as a shock absorber during operation - Since Postalloy® 301 does not respond to heat-treatment and remains ductile, it has the ability to withstand heavy impact or shock loading.

Product Type

Flux-coated electrode

Alternative Wire: Postalloy® 301-SPL, Postalloy® 301-FCG

Weld Deposit Properties
Tensile Strength  
Up to 120,000 psi
Yield Strength  
79,000 psi
Machinable with Carbide Tools  
Cannot be flame-cut  


Gear tooth build-up
Shovel teeth and blades
Wear Plates
Repair cracked manganese castings

Heat-treating parts
Cracked steel casings
Frog repair

POSTALLOY® 301    Welding Parameters
Current: AC or DC Reverse Polarity
Diameter Amps
3/32" (2.4mm) 50-80
1/8" (3.1mm) 80-125
5/32" (4.0mm) 100-150

Welding Procedure

Clean weld area of contaminants. Remove any defective or fatigued weld metal. Bevel heavy sections 90°. Tilt the electrode about 15° in the direction of travel and use the lowest amperage possible. For certain high alloy steels, a preheat of 300-400°F (149-204°C) is recommended. Hold a short arc and use stringer beads. Peen to reduce stresses. Allow to cool and remove slag.

Packaging Options
Standard Packaging
3/32" (2.4mm)
Resealable Plastic Box
1/8" (3.1mm)
Resealable Plastic Box
5/32" (4.0mm)
Resealable Plastic Box