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):
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
