Postalloy® 50 Flux-coated Electrode

Postalloy® 50 is a unique new high strength electrode that uses state of the art coating technology to produce maximum welding performance on all grades of cast iron and cast iron to steel including stainless. Postalloy® 50 offers maximum crack resistivity due to its ideal combination of strength and ductility, and its high tolerance for harmful contaminants, such as sulfur and phosphorus. It has superior arc-purging action that penetrates through surface contamination, including contamination that has literally soaked into the casting, to produce a solid porosity-free deposit. Postalloy® 50 also offers the following important benefits:

  • Dense deposits on dirty, oil-soaked cast iron
  • Non-conductive coating eliminates dangerous side-arcing
  • Electrodes resist overheating reducing stub loss
  • Low amperage minimizes heat rise in the casting


Product Type

  • Flux-coated Electrode


  • Cast Iron applications

Weld Deposit Properties

Also available as a bare semi-automatic wire for MIG welding - Postalloy® 50-SPL
Tensile strength:
75,000 psi
Deposits are machinable
- 200 BHN

Welding Parameters

Current Type: DC Electrode Positive , AC

Amps Diameter
50-70 3/32" (2.4mm)
70-100 1/8" (3.2mm)
100-150 5/32" (4mm)

Welding Procedure:

Vee out cracks and defective weld metal using Postalloy® 250 gouging electrode. When using Postalloy® 50, maintain a short to medium arc length. The arc should be directed on deposited weld metal with the electrode tilted slightly in the direction of travel. Use stringer beads only - do not weave. Weld beads should be 1 to 3" long (25mm to 76.2mm), craters to be filled by back whipping, and each pass should be peened immediately upon breaking arc. Remove slag by chipped and brushing. Allow part to cool slowly. Cover with a heat resistant blanket or lime if possible.

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