Type / Characteristics: Agglomerated aluminate-basic type flux for welding of medium tensile steels and pipe steel up X70 Grade. AMA-AP440 produces a slight silicon and manganese pick-up. 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 steels 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-AP440 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. This flux can be used for welding of suer gas pipe with S2MoTiB or S3MoTiB wires. AMA-AP440 can be used on either DC (positive) or AC up to approximately 1200A.
Damp flux shall be redried by baking at 300°C – 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 as to boniszewski: ~1.5
Mechanical properties of all – weld metal (typical values):
AMA Trade Name
DIN/EN
C
Si
Mn
Mo
50-12
S2
0.06
0.2
1.3
-
50-14
S2mo
0.06
0.2
1.35
0.5
All – weld metal analysis (typical values):
Welding Wire
Tensile Strength ( N/mm 2 )
Yield Strength ( N/mm 2 )
Elongation Lo=5d %
Impact Value (Joule) ISO -V 20°C -40°C-
50-12
515
420
28
130 80
50-14
580
490
27
110 60
Mechanical properties of welded joint (typical values):
