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.


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 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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How to purchase OK 74.78

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To make things even easier, we've developed the online shopping list below.  As you browse our site, you'll be able to click on any product to have it added to this easy reference sheet.  And when you're done, you can send the list to yourself or print it out and bring it in to the distributor of your choice.

To find an ESAB distributor, just use the distributor locator tool featured on every page of our site.  Alternatively, you can call our support line at +361 382 1235 and we'll point you in the right direction.


Part Numbers and Accessories

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