Application and Properties: Agglomerated aluminate-basic type flux for welding of medium tensile steels and pipe steel up X70 Grade. AMA-OP139 produces a slight silicon and manganese pick-up. Owning to its metallurgical behavior, it can be used with AMA 50-14 and AMA 50-18 wire electrodes. It is suitable to be used in high speeds welding with single or multi wire and tandem welding systems. The flux has a high current. Carrying capacity and as such is suitable for fillet and butt-welding applications especially for welds in heavy section steel work. The weld bead is of uniform profile with smooth weld bead profile and good blending at the weld toes even at high welding speeds. The slag detachment is good and in most cases is self-lifting AMA-OP139 is used with a range of low alloy wires including AMA 50-14, AMA 50-57 for the seam welding of pipes were low temperature impact toughness properties are required. AMA-OP139 can be used on either DC (positive) or AC up to approximately 1200A. Damp flux shall be redried by baking at 300 – 350 c Grain size according to DIN 32 522:3-18
Main Constituents:
SiO2+TiO2
CaO+MgO
Al2O3+Mno
CaF2
20%
25%
35%
15%
Basicity to boniszewski: ~1.5
All weld metal analysis (typical values):
DIN/EN
C
Si
Mn
Mo
50-12
S2
0.06
0.20
1.3
-
50-14
S2Mo
0.06
0.3
1.3
0.45
50-18
S4
0.06
0.30
1.8
-
Mechanical properties of all-weld metal (typical values):
