F6AZ-EL12-F7AZ-EM12-F7PZ-EM12-F7AZ-EM12K
universal ama universal

Flux for Submerged Arc welding of General Struct

AMA UNIVERSAL

EN 760 : SA AR 1 97 AC
DIN 32 522: B AR 1 97 AC 10 SKM
AWS/ASME: F6AZ-EL12
AWS/ASME: F7AZ-EM12
AWS/ASME: F7PZ-EM12
AWS/ASME: F7AZ-EM12K
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Application and properties:

Agglomerated aluminate-rutile type flux for welding general structural steels, pressure vessel and pipe steels, as well as fine grain structural steels having a yield strength up to 355N/mm2. AMA UNIVERSAL produces a relatively high silicon pick-up. When using 50-11, 50-12 wire electrodes, also a manganese is suited at approximately 1.3%. The flux can therefore be used with low manganese wire electrodes. AMA UNIVERSAL is particularly suited for twin-wire, tandem and multi-wire welding at higher speeds and advantageous in welding from both sides in one pass, e.g. thin-walled spiral pipes. For increased weld metal toughness, molybdenum alloyed wire electrodes (50-14) should be used with AMA-UNIVERSAL flux. It is specially suited for welding tube-web-tube joints or finned tubes.
Owing easy slag removal, It is also well suited for fillet welding. The weld metal produced is relatively insensitive to porosity when welding on plates contaminated by rust, scale etc. AMA UNIVERSAL can be used on either DC (positive) or AC up to approximately 900A (in single wire welding).

Damp flux shall be redried by baking at 300°C – 350°C
Grain size in accordance with DIN 32 522:2-16*.
Grain size in accordance with DIN 32 522:2

Main Constituents:

SiO2+TiO2 Al2O3 CaF2
30% 55% 5%

Basicity to boniszewskii: ~0.4

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 0.04-0.08 0.5-0.8 0.9-1.3 - -
50-12 S2 0.04-0.08 0.5-0.8 1.2-1.6 - -
50-14 S2Mo 0.04-0.08 0.5-0.8 1.2-1.6 0.5 -
50-22 S2crMo1 0.04-0.08 0.5-0.8 1.2-1.6 0.5 1

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+
50-11 As Welded 450-550 > 360 > 22 > 60
50-12 As Welded 500-600 > 400 > 22 > 50
50-14 As Welded 580-680 > 450 > 18 > 50

Mechanical properties of welded joints (typical values):

13 Cr Mo 44, 10 mm Welded From both sides in one pass.

With Wire Electrode Heat Treatment *Tensile Strength
( N/mm 2 ) 		*Yield Strength
( N/mm 2 ) 		Impact energy (Joule)
ISO -V
20°C+
50-22 As Welded > 440 > 300 > 40
50-22 **Stress relived > 440 > 300 > 50

*Transverse flat tensile specimen
**Stress relived 15 hrs/700C

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, RSt37-2 50-11 50-11,50-12
St44-2, St44-3, St52-3** 50-11 50-11,50-12
Pipe Steels With wire electrode With wire electrode
StE210.7, StE240.7,StE290.7** 50-11 50-11,50-12
StE 320.7 , StE 360.7** 50-12 50-11,50-12
St37, St37.4, St35.8 50-11 50-11,50-12
St44, St44.4,St45.8 50-11 50-11,50-12
St52,St52.4* 50-11,50-12 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** 50-12 50-11,50-12
15 Mo 3** 50-14 50-14
13 Cr Mo 44* - 50-22

*Only for fillet welds or tube-web-tube welding on finned tubes.
**At service temperatures down to +20°C