AMA OP121TT

Type/ Characteristics:

Agglomerated fluoride-basic type flux, preferably used for high strength fine grain structural steels, as well as cryogenic steels and steels resistant to ageing. Owning its neutral behavior as regards pick-up and burn-out of silicon and manganese, wire electrodes having higher percentages of Si and Mn (e.g. 50-27, 50-57) should be used.
AMA-OP121TT is particularly suited for tandem and multi-wire welding. On the strength of COD tests made with, 50-57 wire electrodes, this flux is suitable to be employed for welding offshore components. The weld metal produced in combination with corresponding wire electrodes, meets high toughness requirements at cryogenic temperatures.
AMA-OP121TT produces a short slag, i.e. girth seams of components having a small diameter can be welded without the danger of the slag running off. It produces uniform welds without undercut.
AMA-OP121TT can be used on either DC (positive) or AC up to approximately 1000A.
Damp flux shall be redried by baking at 300°C – 350°C
Grain size according to DIN 32 522:2-20

Main Constituents:

Basicity to boniszewskii: ~3.1

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):

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

1)tempered: 700°C -720°C
2)norm+temp: 920°C/air + 700°C -720°C
3)tempered: 730°C -750°C
4)norm+temp: 940°C/air + 730°C -750°C

Application:

1)only thinner plates
2)Also for stress-relived condition
3)Observe minimum temperature of -40°C
4)Lowest service temperature -80°C
Approval : LRS