F7A0-EL12 F7A0-EM12
op155 ama op155

Flux for Submerged Arc welding of General Struct

AMA OP155

EN 760: SA MS 1 89AC
DIN 32 522: B MS 1 89 AC 8 SKM
AWS/ASME: F7A0-EL12 F7A0-EM12

Type and Characteristics:

Agglomerated Manganese-Silicate type flux for high-speed welding. It is preferably used for welding thin plates at speeds higher than 2.5 meter/min. Welding properties arc outstanding on either AC or DC up to 800A.
AMA OP155 is Suitable for Welding tube-web-tube joints on finned tubes. Exhibiting slag removal.
It is likewise suited for tandem and multi-wire welding.
AMA OP155 produce high Manganese pick-up which decreases with increasing Manganese content of the wire electrode.

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

Main Constituents:

SiO2+TiO2 CaO+MgO Al2O3+MnO
45% 10% 40%

Basicity according to boniszewskii: ~0.8

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 Cr
50-11 S1 0.03-0.07 0.4-0.8 1.4-1.8 - -
50-12 S2 0.03-0.07 0.4-0.8 1.8-2.3 - -
50-14 S2Mo 0.03-0.07 0.4-0.8 1.8-2.3 0.5 -
50-22 S2crMo1 0.03-0.07 0.4-0.8 1.8-2.3 0.5 1

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

With Wire Electrode Heat Treatment Tensile Strength
( N/mm )
Yield Strength
( N/mm )
Elongation
Lo=5d %
Impact energy (Joule)
ISO -V
20°C        ±0°C        -20°C
50-11 As Welded 500-600 > 400 > 22 >90        >60        >35

Mechanical properties of Welded joints (typical values):

With Wire electrode Heat Treatment Tensile Strength
( N/mm )
Yield Strength
( N/mm )
Impact energy (Joule)
ISO -V
20°C     ±0°C
50-12** As Welded >510 > 360 >50     >30
50-14** As Welded >510 > 360 >50     >30
50-22*** As Welded >440 > 300 >40     -
50-14** Stress relived >510 > 360 >50     >30
50-22*** Stress relived >440 > 300 >50     -

Stress relived at 15hrs/700C
*Transverse flat tensile specimen
**StE 36 12 mm, welded from both sides in one pass
***13Cr Mo 44, 15 mm, Welded from both sides in one pass

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 50-11,50-12
St 44-2, St 44-3, St 52-3 50-11 50-11,50-12
Pipe Steels With wire electrode With wire electrode
StE 210.7, StE 240.7, StE 290.7 50-11 50-11,50-12
StE 320.7, StE 360.7 50-12 50-11,50-12
St 35.0, St 37.4, St 35.8 50-11 50-11,50-12
St 44, St 44.4, St 45.8 50-11 50-11,50-12
St 52, St 52.4 50-11 50-11,50-12
Boiler plates With wire electrode With wire electrode
H I, H II 50-11 50-11,50-12
17 Mn 4, 19 Mn 5 50-11 50-11,50-12
15 Mo 3 - 50-14
13 Cr Mo 44 - 50-22