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OP 121TT

SAW basic and semi-basic fluxes

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OP 121TT is a fully basic agglomerated submerged-arc welding flux that is widely used for the welding of structural and fine grained low alloy steels requiring high integrity welds with low temperature impact and CTOD fracture toughness properties.

It meets the classifications:
EN ISO 14174: SA FB 1 55 AC H5
OE-SD3 1Ni ¼Mo => AWS A5.23: F8A10-EG-G
OE-SD3 1Ni ¼Mo => AWS A5.23: F8P10-EG-G
OE-SD3 1Ni ½Mo => AWS A5.23: F9A8-EF3/EG-F3
OE-SD3 1Ni ½Mo => AWS A5.23: F9P8-EF3/EG-F3
OE-SD3 2NiCrMo => AWS A5.23: F11A8-EG-G
OE-SD3 2NiCrMo => AWS A5.23: F11P5-EG-G

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OERLIKON expertise : OP 121TT

OP 121TT flux, in combination with a range of Oerlikon submerged-arc wires, in particular with OE-SD3, is established for the welding of offshore structures such as oil platform jackets, piles, decks and modules giving a high level of consistency and mechanical property performance. The flux is widely used for the welding of thick section components in the offshore, nuclear and pressure vessel industries.
The flux exhibits low hydrogen content in the as manufactured condition and gives a high resistance to moisture pick up during exposure under workshop conditions. The flux promotes a very stable arc characteristic during use with excellent slag detachment.
The weld is of a uniform even profile with regular fine ripple formation and smooth toe blending.

OP 121TT flux is suitable for use with DC+ or AC and is ideal for single wire, twin wire, tandem arc [DC+/AC] and other multi-arc systems using up to 1000 A with single wire welding. Grain size according to EN-ISO 14174: 2-20.

Available in standard bags (PE) and DRYBAG 25kg.

 

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OP 121TT Chemical Analysis

  C MN SI CR NI MO
OE-SD3 1Ni ¼Mo 0.07 1.3 0.3 - 0.9 0.2
OE-SD3 1Ni ½Mo 0.07 1.5 0.3 - 0.95 0.5
OE-SD3 2NiCrMo 0.07 1.4 0.4 0.6 2.2 0.5

OP 121TT Mechanical Properties

  Heat Treatment Yield Strength (MPa) Tensile Strength (MPa) Elongation A5 (%)                       Impact Energy ISO - V (J)
          0°C   -20°C -40°C -60°C -80°C
OE-SD3 1Ni ¼Mo As Welded ≥ 500 560-680 ≥ 22 -   - ≥ 145 ≥ 70 -
OE-SD3 1Ni ¼Mo 600°Cx2h ≥ 470 550-660 ≥ 24 -   - ≥ 160 ≥ 70 -
OE-SD3 1Ni ½Mo As Welded ≥ 550 650-750 ≥ 20 ≥ 120 ≥ 90 ≥ 70 ≥ 47 -
OE-SD3 1Ni ½Mo 600°Cx2h ≥ 540 630-730 ≥ 22 ≥ 140 ≥ 120 ≥ 90 ≥ 70 -
OE-SD3 2NiCrMo As Welded ≥ 720 760-900 ≥ 18 -   - - ≥ 69 -
OE-SD3 2NiCrMo 580°Cx2h ≥ 600 700-850 ≥ 19 -   - ≥ 47 - -

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  • 01

    Expertise

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  • 02

    Customer focus

    Oerlikon supplies customized solutions through performance and innovation, to meet stringent specifications and increasing demands for enhanced welding productivity.

  • 03

    International presence

    With 12 productions units throughout Europe & China, Oerlikon is one of the largest supplier of welding ​products​. Oerlikon products can be found worldwide.