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CLASSIFICATIONS: E71T-1C, E71T-1M, E71T-9C, E71T-9M per AWS A5.20, SFA 5.20

A carbon steel, flux cored electrode, Select 720A is intended for the single and multiple pass welding of carbon steels in all positions. Carbon dioxide is the recommended shielding gas, however, the use of 75-80% argon / balance carbon dioxide may produce somewhat higher tensile strength with no significant difference in CVN toughness.

APPLICATIONS: Select 720A is an ideal choice for those weldments requiring good CVN toughness and high welder appeal when joining steels such as ASTM A36, A515 Gr 70, A516 Gr 70 and other fine grained steels. These applications would include shipbuilding, offshore drilling structures, structural welds and general plate fabrication.

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

SHIELDING GAS: 100% CO2, 75-80% Ar/balance CO2, 35-50 cfh

WELDING POSITIONS: All positions

CHARACTERISTICS:

  • Delivers superior CVN toughness at subzero temperatures.
  • Outstanding welder appeal over a broad range of welding parameters.
  • Arc transfer is an extremely smooth spray with minimal spatter, even at low current levels.
  • Provides superb puddle control.
  • Fast freezing slag facilitates all position welding.
  • Bead profile is quite flat with only minor convexity.
TYPICAL MECHANICAL PROPERTIES
 
CO2
75% Ar/ 25% CO2
Ultimate Tensile Strength (psi) 83,000 86,500
Yield Strength (psi) 75,300 78,400
Percent Elongation 28 27
CVN (ftlb f) @ -20° F 58 59

TYPICAL DEPOSIT COMPOSITION
Wt% C Mn P S Si
CO2
.05 1.21 .008 .010 .38
75 Ar/ 25 CO2
.05 1.37 .008 .009 .42

TYPICAL WELDING PARAMETERS (CO2) *
  Optimum Range
Diam. Position Amps
WFS Voltage Amps Volts
1/16" Flat 350 300 29 150 - 400 22 - 34
  Overhead 225 160 26 150 - 310 22 - 28
  Vertical up 225 160 25 150 - 280 22 - 27
.052" Flat 300 360 28 100 - 330 19 - 32
  Overhead 225 245 26 150 - 310 21 - 28
  Vertical up 225 245 25 150 - 280 21 - 27
.045" Flat 250 282 28 100 - 300 21 - 32
  Overhead 200 265 26 150 - 280 21 - 29
  Vertical up 200 265 25 100 - 230 21 - 28
.035" Flat 175 511 26 100 - 250 21 - 30
  Overhead 150 490 24 100 - 175 21 - 26
  Vertical up 150 490 24 100 - 175 21 - 26

* For 75Ar-25CO2 shielding gas lower the voltage by 1 to 1.5 volts.