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CLASSIFICATIONS: E71T-1M, E71T-9M per AWS A5.20, MIL-71T-1 HYM per MIL-E-24403/1

APPROVALS: ABS 3YSA (C25), MIL-71T-1-HYM

Select 721 is an E71T-1M electrode designed to conform to MIL-71T-1-HYM per Mil-E-24403/1, with the added capability of being used with argon/carbon dioxide blends of up to 95% argon. This electrode is approved and listed on the Navy QPL.

APPLICATIONS: Although Select 721 was designed with Naval shipbuilding in mind, it is well suited to many other applications such as commercial shipbuilding, general steel fabrication, construction and farm equipment, structural steel and pressure vessel fabrication.

DIAMETERS: .035", .045", .052", 1/16"

SHIELDING GAS: 75-95% Ar/balance CO2, 35-50 cfh

WELDING POSITIONS: All positions

CHARACTERISTICS:

  • Outstanding welder appeal.
  • Low fume generation rates and spatter.
  • Good CVN toughness to -20° F.
  • Diffusible hydrogen levels within MIL spec of 5 ml/100 gr of weld metal.
TYPICAL MECHANICAL PROPERTIES
  75% Ar / 25% CO2
Ultimate Tensile Strength (psi) 78,100
Yield Strength (psi) 66,800
Percent Elongation 30
CVN (ftlb f) @ -20° F 50

TYPICAL DEPOSIT COMPOSITION
Wt% C Mn P S Si Ni
75 Ar/25 CO2
.06 1.09 .006 .007 .33 .44

RECOMMENDED WELDING PARAMETERS
  Optimum Range
Diam. Position Amps Volts WFS Amps Volts
1/16" Flat 330 28 330 150-400 22-34
  Overhead 225 25 180 150-310 22-28
  Vertical Up 225 24 180 150-280 22-27
.052" Flat 275 27 400 140-330 19-32
  Overhead 200 25 245 150-290 21-28
  Vertical Up 200 24 245 140-270 21-27
.045" Flat 250 27 450 130-300 21-32
  Overhead 190 25 305 150-280 21-30
  Vertical Up 190 24 305 130-260 21-29
.035" Flat 200 26 600 125-250 21-30
  Overhead 175 24 490 115-220 21-28
  Vertical Up 170 24 450 120-215 21-28