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- OA BK- 59
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Hard Facing Welding Wire OA BK 59
OA 59 Flux-cored wire with outstanding abrasion resistance with medium impact. It is suitable for multi-layer build-up and recommended for applications involving severe abrasion, with impact.
Applications
Extreme abrasion resistant with reasonable impact properties and temperature resistance up to 300ºC . Due to the combination Cr and Nb carbides the deposit structure contains very fine particles that results in excellent wear resistance against heavy abrasion. Usualy the maximum number of layers is 2 till 3 but when Hard facing of mining and rock-crushing machine parts as well as of hard manganese steel . austenitic manganese steel, high impact loads, hammers, crushers, rebuilding, hard facing, rails, crossings, Breaker teeth, etc..Classification
AWS
A 5.21
EN ISO
14700: T Fe15
DIN
8555: MF 10-60-GTypical Weld Metal Analysis %
| C | Mn | Si | Cr | Nb | Fe |
| 5% | 0.50% | 1% | 22% | 7% | Bal. |
Mechanical Properties (As Welded)
| Abrasion Resistance |
Impact Resistance |
Deposit Layers |
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| Extreme |
medium |
Multiple |
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General Information
Welding process
Mig/Mag welding (FCAW)
Alloy Type
C-Cr-Nb Carbide basis
Re-drying Temperature
At Require
Welding Position
PA, PB, PC
Cleaning
Remove all cracks and fatigued metal by grinding.
Polarity
AC or DC,
Welding Parameters
| Diameter (mm) |
Voltage (V) | Current (A) |
| 1.6 | 20-30 | 180-320 |
| 2.4 | 26-32 | 200-400 |
| 2.8 | 29-32 | 350-450 |
Instruction:
Weld with low heat input.
Use a stick-out (distance from the contact tip to the extremity of the wire) of 20 to 50 mm (1-2") for open arc welding.
For a correct wire feed, use appropriate drive rolls for cored wire in the wire feeder and a water-cooled torch that is smoothly inclined.
On crack-sensitive steels or for hard facings where heavy impact occurs, use a base layer of OA 4370.