op139 ama op139

Flux for Submerged Arc welding of General Struct


DIN EN 760: SA AB 1 67 AC H5
DIN 32 522: B AB 1 67 AC 12 MHP5
AWS/ASME: F8P5-EA2  F7P5-EM13K    F7A4-EM12    F8A5-EH12K    F7A4-EM12K    F7P6-EH12K    F7P5-EM12K    F8A4-EA2    F7A5-EM13K

Application and Properties:
Agglomerated aluminate-basic type flux for welding of medium tensile steels and pipe steel up X70 Grade. AMA-OP139 produces a slight silicon and manganese pick-up. Owning to its metallurgical behavior, it can be used with AMA 50-14 and AMA 50-18 wire electrodes. It is suitable to be used in high speeds welding with single or multi wire and tandem welding systems. The flux has a high current.
Carrying capacity and as such is suitable for fillet and butt-welding applications especially for welds in heavy section steel work. The weld bead is of uniform profile with smooth weld bead profile and good blending at the weld toes even at high welding speeds. The slag detachment is good and in most cases is self-lifting AMA-OP139 is used with a range of low alloy wires including AMA 50-14, AMA 50-57 for the seam welding of pipes were low temperature impact toughness properties are required.
AMA-OP139 can be used on either DC (positive) or AC up to approximately 1200A.
Damp flux shall be redried by baking at 300 – 350 c
Grain size according to DIN 32 522:3-18

Main Constituents:

SiO2+TiO2 CaO+MgO Al2O3+Mno CaF2
20% 25% 35% 15%

Basicity to boniszewski: ~1.5

All weld metal analysis (typical values):

Welding Wire electrode Weight %
50-12 S2 0.06 0.20 1.3 -
50-14 S2Mo 0.06 0.3 1.3 0.45
50-18 S4 0.06 0.30 1.8 -

Mechanical properties of all-weld metal (typical values):

Welding Wire electrode Heat Treatment Tensile Strength
( N/mm )
Yield Strength
( N/mm )
Lo=5d %
Impact Value (Joule)
-20°C       -40°C       -60°C+
50-12 As Welded 495 390 31 120            60          -
50-14 As Welded 585 500 25 100            50          -
50-18 As Welded 580 480 26 105          60          40