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op122 ama op122

Flux for Submerged Arc welding of General Struct

AMA OP122

EN 760: SA FB 1 65 AC HP 5
DIN 32 522: B FB 1 65 AC 12MHP 5
AWS/ASME: F7P2-EA2    F7A5-EH12K    F6A2-EM12    F7P5-EH12K    F6A2-EM12K    F7A2-EA2    F7A2-EM13K
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Type/ Characteristics:

Agglomerated fluoride-basic type flux for welding general structural steels, pressure vessel and pipe steels, as well as fine grain structural steels.
As regards silicon, AMA-OP122 will produce a slight pick-up, whereas it is relatively neutral as to manganese, which requires the use of wire electrodes having higher manganese content, as for instance 50-12, 50-15. AMA-OP122 is also suitable to be used for twin wire, tandem and multi wire welding, as well as for welding from both sides in one pass, as is the case in fabrication large diameter pipes. For improved toughness values, it is advisable to use molybdenum alloyed wire electrodes. AMA-OP122 exhibits high current carrying capacity and is therefore suitable for depositing large fillet weld sections. Slag removal is excellent. Owning to its low bulk density, consumption is also low. On account of its special production mode, moisture pick-up of the flux and hydrogen content of the weld metal are low.
AMA-OP122 can be used on either DC (positive) or AC up to 1200A.

Damp flux shall be redried by baking at 300°C – 350°C
Grain size according to DIN 32 522:2-20

Main Constituents:

SiO2+TiO2 CaO+MgO Al2O3+MnO CaF2
20% 30% 25% 20%

Basicity to boniszewskii: ~1.7

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
50-12 S2 0.04-0.08 0.1-0.2 0.8-1.2 -
50-14 S2MO 0.04-0.08 0.1-0.2 0.8-1.2 0.5
50-15 S3 0.04-0.08 0.15-0.25 1.3-1.6 -

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     -40°C     -60°C
50-12 As Welded 450-550 > 360 > 24 >150         >110         >90         >50       -      
50-14 As Welded 510-620 > 430 > 20 >90            >70           >40             -       -    
50-15 As Welded 500-600 > 400 > 24 >160          >130          >100          >70       30

Application:

Materials Multi pass joint welding Welding from both sides in one pass
General structural steels With wire electrode With wire electrode
St37-2,Ust37-2, RSt37-3 50-12 50-12,50-14
St37-3,St44-2, St44-3 50-12 50-12.50-14
St52-3 50-12,50-15 50-12.50-14
Pipe steels With wire electrode With wire electrode
StE 210.7, StE 240.7, StE 290.7 50-12 50-12.50-14
StE 320.7, StE 360.7, StE 385.7 50-15 50-12,50-14
StE 415.7, StE 445.7, StE 480.7 50-14 50-14
St 37, St37.4, St 35.8 50-12 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 50-14 50-14
X46, X52, X56 50-14 50-14
X60, X65, X70 50-14 50-14
Boiler plates With wire electrode With wire electrode
H I, H II 50-12 50-12,50-14
17 Mn 4 50-12 50-12,50-14
19 Mn 5 50-12 50-12,50-14
15 Mo 3 50-14 50-14
Fine grain structural steels With wire electrode With wire electrode
StE255, WStE255 50-12 50-12,50-14
StE285, WStE285 50-12 50-12,50-14
StE315, WStE315 50-12 50-12,50-14
StE355, WStE355 50-12 50-12,50-14
StE380, WStE380 50-15 50-12,50-14
StE420, WStE420 50-14 50-14
TStE255, TStE285 50-15 -
TStE315, TStEE355 50-15 -
TStE380 50-15 -

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