OK Autrod 12.66

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OK Autrod 12.66 is a copper-coated Mn-Si-alloyed solid wire designed for the mechanised downhill GMAW of pipelines in materials such as API 5L grade 52 to 70. The main application areas are pipelines, compressor stations and associated work in the oil and gas industries. This is an EN 440 G4Si1 type with an improved impurity level to meet the special requirements of this industry. It is supplied on 1 and 5 kg wire spools for use on mechanised pipe welding systems. The wire can be used with both Ar/CO2 mixed gas and pure CO2 shielding gas.

Typical Charpy V-Notch Properties

Impact Value Testing Temperature
as welded aws co2 (c1)
100 J (74 ft-lb) -20 degC (-4 degF)
80 J (59 ft-lb) -29 degC (-20 degF)
as welded en 80ar/20co2 (m21)
100 J (74 ft-lb) -20 degC (-4 degF)
80 J (59 ft-lb) -30 degC (-22 degF)
140 J (104 ft-lb) 20 degC (68 degF)
as welded en co2 (c1)
80 J (59 ft-lb) -20 degC (-4 degF)
120 J (89 ft-lb) 20 degC (68 degF)

Typical Tensile Properties

Condition As Welded As Welded As Welded
Shielding Gas AWS CO2 (C1) EN 80Ar/20CO2 (M21) EN CO2 (C1)
Tensile Strength 575 MPa (83 ksi) 600 MPa (87 ksi) 575 MPa (83 ksi)
Yield Strength 470 MPa (68 ksi) 545 MPa 495 MPa
Elongation 29 % 26 % 25 %


Wire Electrode SFA/AWS A5.18 : ER70S-6
Weld Metal EN ISO 14341-A : G 42 2 C1 4Si1
EN ISO 14341-A : G 46 3 M21 4Si1
Wire Electrode EN ISO 14341-A : G 4Si1
Weld Metal EN ISO 636-A : W 46 3 W4Si1
Wire Electrode EN ISO 636-A : W4Si1


Approvals NAKS/HAKC 1.0-1.2 mm
VdTÜV 10035
Approvals are based on factory location. Please contact ESAB for more information.

Consumable Characteristics

Alloy Type Carbon-manganese steel (Mn/Si-alloyed)

Typical Weld Metal Analysis %

Typical Wire Composition %
C Mn P S Si
0.09 % 1.65 % - - 0.97 %
Typical Weld Metal Analysis %
80Ar/20CO2 (M21)
0.07 % 1.25 % 0.009 % 0.009 % 0.82 %
CO2 (C1)
0.06 % 1.05 % 0.009 % 0.009 % 0.72 %

How to purchase OK Autrod 12.66

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Part Numbers and Accessories

Part Numbers : OK Autrod 12.66