F7AO-EL12-F7AO-EM12-F7AO-EM12K-F7PO-EM12K
op123 ama op123

Flux for Submerged Arc welding of General Struct

AMA OP123

EN 760: SA AB 1 67 AC
DIN 32 522: B AB 1 67 AC 10 M
AWS/ASME: F7AO-EL12 F7AO-EM12 F7AO-EM12K F7PO-EM12K
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Application and properties:

Agglomerated aluminate-basic type flux for welding general structural steels, pressure vessel and pipe steels, as well as fine grain structural steels. AMA-OP123 produces slight silicon and mean manganese pick-up. Owing to its metallurgical behavior, It can be used with 50-11, 50-12, 50-14 wire electrodes. It is suited to be used in twin-wire and multi-wire welding, as well as in welding from both sides in one pass, e.g. In the production of large diameter pipes. With this process variant, the use of molybdenum alloyed wire electrodes for increased toughness values is advisable. An outstanding feature of AMA-OP123 flux is its high current carrying capacity. Unless there are limitation imposed by base metal quality, this feature of the flux can be of benefit when slag can be easily removed in all cases, the slag being short, i.e. girth seams of small diameter work pieces can be welded without the danger of the slag running off. On account of its low bulk density, flux consumption is low.
AMA-OP123 can be used on either DC (positive) or AC up to 1000A.

Damp flux shall be redried by baking at 300°C – 350°C
Grain size in accordance with DIN 32 522:2-20*.

Main Constituents:

SiO2+TiO2 CaO+MgO Al2O3+MnO CaF2
20% 20% 45% 10%

Basicity to boniszewskii: ~1.0

Metallurgical behavior:

Pick-up and burn-off the alloying elements Si and Mn as a function of the alloy content of the wire electrode, DVS Merkblatt 0907, part 1

All -Weld metal analysis (typical values):

With Wire Electrode Weight %
AMA Trade Name DIN/EN C Si Mn Mo
50-11 S1 0.05-0.08 0.2-0.4 0.7-1.1 -
50-12 S2 0.05-0.08 0.2-0.4 1.2-1.6 -
50-14 S2Mo 0.05-0.08 0.2-0.4 1.2-1.6 0.5

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

With Wire Electrode Heat Treatment Tensile Strength
( N/mm 2 ) 		Yield Strength
( N/mm 2 ) 		Elongation
Lo=5d % 		Impact energy (Joule)
ISO -V
20°C        ±0°C        -20°C
50-11 As Welded 420-520 > 360 > 24 >90        >50        >35
50-12 As Welded 500-600 > 400 > 22 >90        >50        >35
50-14 As Welded 600-700 > 450 > 18 >65        >50        >35

Application:

Materials Multi pass joint welding Welding from both sides in one pass
General structural steels With wire electrode With wire electrode
St 37-2, USt 37-2, RSt 37-2 50-11 50-12,50-14
St37-2, St44-2, St44-3, St52-3 50-12 50-12,50-14
Pipe Steels With wire electrode With wire electrode
StE210.7, StE240.7 50-11 50-12,50-14
StE 290.7 , StE 320.7, StE360.7 50-12 50-12,50-14
St37, St37.4, St35.8 50-11 50-12,50-14
St 44, St 44.4, St 45.8 50-12 50-12,50-14
St 52, St 52.4 50-12 50-12,50-14
X42 50-11 50-12,50-14
X46, X52, X56 50-12 50-12,50-14
X60, X65, X70 50-14 50-12,50-14
Boiler Plates With wire electrode With wire electrode
H I, H II 50-11 50-12,50-14
17Mn 4, 19Mn 5 50-12 50-12,50-14
Fine grain structural steels With wire electrode With wire electrode
StE 255, WStE 255 50-11 50-12,50-14
StE 285, WStE 285 50-12 50-12,50-14
StE 315, WStE 315 50-12 50-12,50-14
StE 355, WStE 355 50-12 50-12,50-14
StE 380, WStE 380 50-12 50-12,50-14
StE 420, WStE 420 50-11,50-14 50-12,50-14

For welding from both sides in one pass, especially in multi-wire welding 50-14 wire electrode should be used because of the fine-grain formation caused by molybdenum.