OK 74.78

ESAB

OK 74.78

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OK 74.78 is an LMA electrode suitable for welding high tensile steels used in low-temperature applications. Good notch toughness down to -40°C. Very suitable for both the enclosed welding and cladding of rails, when a hardness of about 250 HV is required. The moisture content of the coating is very low, which makes OK 74.78 suitable when preheating cannot be applied.

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Typical Charpy V-Notch Properties

Impact Value Testing Temperature
as welded iso
90 J (67 ft-lb) -40 degC (-40 degF)
70 J (52 ft-lb) -50 degC (-58 degF)

Typical Tensile Properties

ConditionElongationShielding GasTensile Strength Yield Strength
As Welded24 %ISO650 MPa (94 ksi)600 MPa (87 ksi)

Deposition Data

Current Fusion time per electrode at 90% I max Deposition Rate @ 90% I max Diameter Deposition Efficiency (%) Number of electrodes/kg weld metal Voltage
75-100 A 55 sec 0.9 kg/h (2,0 lb/h) 2.5 x 350.0 mm (0.098 x 13,8 in.) 62 % 73.0 22 V
105-140 A 86 sec 1.3 kg/h (2,9 lb/h) 3.2 x 450.0 mm (1/8 x 17,7 in.) 65 % 32.0 23 V
140-190 A 97 sec 1.8 kg/h (4,0 lb/h) 4.0 x 450.0 mm (5/32 x 17,7 in.) 65 % 20.5 23 V
190-260 A 100 sec 2.6 kg/h (5,7 lb/h) 5.0 x 450.0 mm (0.197 x 17,7 in.) 68 % 14.0 24 V
240-340 A 103 sec 3.6 kg/h (7,9 lb/h) 6.0 x 450.0 mm (0.236 x 17,7 in.) 69 % 10 24 V

Classifications

Classifications SFA/AWS A5.5 : E9018-D1
EN ISO 18275-A : E 55 4 MnMo B 3 2 H5

Approvals

Approvals ABS 3YQ460 H5
CE EN 13479
DB 82.039.02
DNV-GL 3 Y46H5
VdTÜV 01027
Approvals are based on factory location. Please contact ESAB for more information.

Consumable Characteristics

Alloy Type Low alloyed (0.4 % Mo)
Coating Type Basic covering
Diffusible Hydrogen < 5.0 ml/100g
Welding Current AC, DC+

Typical Weld Metal Analysis %

Typical Weld Metal Analysis %
C Cr Mn Mo Ni Si
0.05 % 0.03 % 1.60 % 0.35 % 0.03 % 0.35 %
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Part Numbers and Accessories

Part Numbers : OK 74.78
74782530K0 FIND A DISTRIBUTOR
74783240G0 FIND A DISTRIBUTOR
74784040G0 FIND A DISTRIBUTOR
74785040G0 FIND A DISTRIBUTOR
74786040G0 FIND A DISTRIBUTOR
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