Postalloy® 30 Flux-coated Electrode

Postalloy® 30 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® 30 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® 30 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


  • Shafts and keyways
  • Gear tooth buildup
  • Stamping and forging dies
  • Shovel teeth and blades
  • Wear Plates
  • Grousers
  • Heat-treating parts
  • Cracked steel casings
  • Jigs and fixtures
  • Chain links

Weld Deposit Properties

Also available as semi-automatic welding wire 301-SPL and 301-FCG
Tensile strength:
Up to 120,000 psi
Deposits cannot be flame-cut
Machinable with carbide tools

Welding Parameters

Current Type: DC Electrode Positive , AC

Amps Diameter
50-80 3/32" (2.4mm)
80-125 1/8" (3.2mm)
100-150 5/32" (4mm)

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

Diameter Standard Packaging
3/32" (2.4mm) Resealable Plastic Box
1/8" (3.2mm) Resealable Plastic Box
5/32" (4mm) Resealable Plastic Box