Postalloy® 305 Flux-coated Electrode

Postalloy® 305 is a non-cracking electrode designed to weld low alloy, high strength steel such as T-I, Hy-90, Hy-100, SSS-100. An all-position electrode that provides crack-free welds under highly stressed conditions with outstanding elongation and ductility. Easy slag removal.


Product Type

  • Flux-coated Electrode


  • Used to fabricate tanks, containers, covers, and high strength pipe.
  • Use for welding low alloy steels containing manganese, nickel, molybdenum, and chromium such as I-beams, angle iron, scaffolding and super structures.
  • Weldments can be used as welded or stress relieved.

Weld Deposit Properties

Also available as a flux-cored wire - Postalloy® 3044-FCG
Tensile strength:
Up to 113,000 psi
Yield strength:
Up to 104,000 psi

Welding Parameters

Current Type: DC Electrode Positive , AC

Amps Diameter
100-150 1/8" (3.2mm)
120-210 5/32" (4mm)
200-275 3/16" (4.8mm)

Welding Procedure:

Preheat is unnecessary when welding low carbon steels. A preheat of 400-600 °F (204-316 °C) is recommended when joining heavy sections to thin sections and low alloy or higher carbon steels are welded. Maintain a short arc and use stringer or weave beads. Allow deposit to cool before chipping off slag. Heat to 1025 °F (552 °C) and maintain for 1 hour to stress relieve.

Packaging Options

Diameter Standard Packaging
1/8" (3.2mm) Resealable Plastic Box
5/32" (4mm) Resealable Plastic Box
3/16" (4.8mm) Resealable Plastic Box