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CLASSIFICATIONS: E90T1-B3C, E90T1-B3M per AWS A5.29, ASME SFA 5.29

Select 91-B3 is a low alloy steel electrode for single and multiple pass welding of certain high temperature, creep resistant materials in horizontal fillets and the flat position. The rutile slag system provides high welder appeal and good weld bead geometry.

APPLICATIONS: Select 91-B3 deposits weldments with a composition matching those of ASTM A387 Gr 22 plate and A335 P22 pipe steels. These materials are used in the fabrication of pressure vessels, boilers, heat exchangers and other applications involved with high temperature exposure and creep resistance.

DIAMETERS: .052", 1/16", 5/64", 3/32"

SHIELDING GAS: 100% CO2, 75% Ar/25% CO2, 35-50 cfh

WELDING POSITIONS: Flat and Horizontal

CHARACTERISTICS:

  • Rutile slag system provides good welder appeal and bead geometry.
  • Deposit composition is nominally 2 1/4% chrome and 1% molybdenum.
  • Higher deposition rates than covered or solid electrodes.

    TYPICAL MECHANICAL PROPERTIES
      SR 1 Hr @ 1275° F
      CO2 75%AR/
    25% CO2
    Ultimate Tensile Strength (psi) 105,500 108,400
    Yield Strength (psi) 95,000 96,700
    Percent Elongation 18 18

    TYPICAL DEPOSIT COMPOSITION
    Wt% C Mn P S Si Cr Mo
    CO2 .06 .70 .010 .010 .50 2.24 1.01
    75/25 .07 .72 .010 .010 .57 2.45 1.14

    RECOMMENDED WELDING PARAMETERS *
      Operating Range Optimum
    Diam. Amps
    (DCEP)
    Volts WFS
    (in/min)
    ESO Amps Volts WFS
    .052" 150-375 20-32 140-550 1/2-1" 275 28 400
    1/16" 150-400 22-34 130-500 1/2-1" 330 29 330
    5/64" 280-430 26-33 140-300 1±1/4" 390 29 250
    3/32" 300-550 28-37 110-270 1±1/4" 425 29 180

    *With CO2 shielding gas. For 75 Ar/25 CO2 decrease voltage by 1 to 1.5 volts.

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