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Pipeweld 78LH Flux

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Pipeweld 78LH flux is a low hydrogen and moisture resistant agglomerated, basic flux, specifically designed for multi wire welding of line pipe steels grades like X70 and X80. It can be used in the production of spiral or longitudinal welded line pipe. The flux adds some Si and Mn to the weld metal and it works equally well on DC and AC current. Pipeweld 78LH flux produces welded joints with minimal reinforcement, low transition angles and smooth surface finish even at high welding speeds. A proper reinforcement means cost saving in the later pipe coating operation, since the coating thickness can be reduced. With different wires it is suitable for all mild and high strength line pipe steels.

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Industries

  • Pipeline
  • Pipe Mills

Welding Process

  • SAW - Submerged Arc Welding

Classifications

Classifications AWS A5.23 : F8A4-EA2-A2, F8A4-EA4-A4, F8TA6-EA2TiB
AWS A5.17 : F7A5-EM12K

Consumable Characteristics

Basicity Index 1.3
0
Density 1.2 kg/dm3
Diffusible Hydrogen 4ml H/100g weld metal (as produced)
Grain Size 0.315mm-2.0mm
Slag Type Aluminate-basic

Classifications

Wire AWS/EN AWS - As Welded AWS - PWHT
OK Autrod 13.64 AWS A5.23: EA2TiB AWS A5.23: F8TA6-EA2TiB
Spoolarc 81 AWS A5.17: EM12K AWS A5.17: F7A5-EM12K
OK Autrod 12.24 AWS A5.23: EA2 AWS A5.23: F8A4-EA2-A2 AWS A5.23: F7P2-EA2-A2

Typical Mechanical Properties

Combined with Wire Condition Yield Strength Tensile Strength Charpy V-Notch Elongation
OK Autrod 12.24 As Welded null 495 MPa
(72 ksi)
580 MPa
(84 ksi)
40 J @ -40°C,
(30 ft-lb @ -40 °F)
25 %
OK Autrod 12.24 Stress Relieved 1 hr @ 621C (1150F) 450 MPa
(65 ksi)
550 MPa
(80 ksi)
25 J @ -40°C,
(18 ft-lb @ -40 °F)
25 %
OK Autrod 12.24 null Two-Run (acc to AWS) Plate Thickness 12 mm (1/2 In) Heat Input 2.3 kJ/mm (58 kJ/in) 650A, 34 V, 58 cm/min (23 in/min) DC+ 515 MPa
(75 ksi)
650 MPa
(94 ksi)
31 J @ -29°C,
(23 ft-lb @ -20 °F)
25 %
OK Autrod 13.64 null Two-Run (acc to AWS) Plate Thickness 12 mm (1/2 In) Heat Input 2.3 kJ/mm (58 kJ/in) 650A, 34 V, 58 cm/min (23 in/min) DC+ 550 MPa
(80 ksi)
650 MPa
(94 ksi)
60 J @ -51°C,
(44 ft-lb @ -60 °F)
24 %
Spoolarc 81 As Welded null 420 MPa
(61 ksi)
520 MPa
(75 ksi)
110 J @ -29°C,
(81 ft-lb @ -20 °F)
26 %
Spoolarc 81 null Two-Run (acc to AWS) Plate Thickness 12 mm (1/2 In) Heat Input 2.3 kJ/mm (58 kJ/in) 650A, 34 V, 58 cm/min (23 in/min) DC+ 505 MPa
(73 ksi)
640 MPa
(93 ksi)
36 J @ -29°C,
(27 ft-lb @ -20 °F)
24 %
Spoolarc 83 As Welded null 660 MPa
(96 ksi)
760 MPa
(110 ksi)
54 J @ -40°C,
(40 ft-lb @ -40 °F)
24 %
Spoolarc 83 null Two-Run (acc to AWS) Plate Thickness 12 mm (1/2 In) Heat Input 2.3 kJ/mm (58 kJ/in) 650A, 34 V, 58 cm/min (23 in/min) DC+ 550 MPa
(80 ksi)
705 MPa
(102 ksi)
41 J @ -51°C,
(30 ft-lb @ -60 °F)
28 %

Typical Weld Metal Analysis %

Typical Weld Metal Analysis %
C Mn Mo Si
DC+, 580A, 29V OK Autrod 12.24
0.07 % 1.3 % 0.5 % 0.3 %
DC+, 580A, 29V Spoolarc 81
0.07 % 1.4 % - 0.4 %
DC+, 580A, 29V Spoolarc 83
0.07 % 2.65 % 0.5 % 0.71 %
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