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OK 84.78
SMAW
Type Rutile-basic
Electrode producing a weld metal with coarse chromium carbides in an austenitic matrix. Suitable for surfacing worn parts exposed to abrasion; earth-moving machines, mixers, feeder screws, dust exhausters, crushers and from wear by coal, ore and other minerals. Also in corrosive environments and/or elevated temperatures.
Welding current, A
AC, DC+ OCV 50 V
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | | | Redrying temperature, °C
300
Redrying time, hours
2
Recovery
180-190
Weld metal hardness, a w
59-63 HRC
Tempering resistance
Temp°C/1h.HRC
100.58
300.59
400.57
490.59
600.57
700.58
Machinability
Grinding only
Abrasion resistance
Excellent
High temp. wear resistance
Good
Corrosion resistance
Excellent
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| Diameter, mm | 2,5 | 3,2 | 4,0 | 5,0 | | Length, mm | 350 | 350 | 450 | 450 | | Arc voltage, V | 24 | 24 | 26 | 26 | | Welding current, A | 90-120 | 115-170 | 130-210 | 150-300 | | N. Kg weld metal/kg electrodes | 0,62 | 0,62 | 0,64 | 0,64 | | B. No. of electrodes/kg weld metal | 48,0 | 26,0 | 13,5 | 9,0 | | H. Kg weld metal/hour arc time | 1,2 | 1,6 | 2,0 | 2,9 | | T. Burn-off time, secs/electrode | 60 | 85 | 135 | 140 |
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