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Forney 220 MP - Gas Selection for Welding; MIG;FCAW Setup Chart

Forney 220 MP
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19
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Select the appropriate shielding gas in accordance to material being welded and wire being used. The table below can
give you some useful indications:
METAL GAS NOTE
Mild Steel CO2
Argon + CO2
Argon + CO2 + Oxygen
Argon controls spatter
Oxygen improves arc stability
Stainless Steel Argon + CO2 + Oxygen
Argon + Oxygen
Arc stability.
Minimum splatter
METAL GAS NOTE
Copper, Nickel & Alloys Argon
Argon + Helium
Suitable for light gauges because of low flowability
of the weld pool.
Higher heat input suitable for heavy sections
Use Spool Gun for MIG
NOTE: THIS MACHINE IS NOT AN APPROPRIATE POWER SOURCE FOR WELDING
ALUMINUM.
Press the PROCESS SELECTOR BUTTON on the front panel to the top position.
Connect the MIG gun into the EURO CONNECT SOCKET.
Connect the MIG ELECTRODE POLARITY JUMPER (8) to the appropriate DINSE SOCKET:
o Flux-cored wire welding (FCAW): Jumper to NEGATIVE (-) DINSE SOCKET.
o MIG Welding (GMAW): Jumper to POSITIVE (+) DINSE SOCKET.
Connect the ground cable to the appropriate DINSE SOCKET:
o Flux-cored wire welding (FCAW): Ground cable to POSITIVE (+) DINSE SOCKET.
o MIG Welding (GMAW): Ground cable to NEGATIVE (-) DINSE SOCKET.
Ensure the ground clamp has a good connection to the workpiece and is connected on clean, bare metal (not rusty or
painted).
Load the spool of wire inside the cabinet and feed it through the WIRE FEEDER into the gun (see “Installing the
Welding Wire”, page 14).
Switch the unit ON with the ON/OFF SWITCH.
Press the gun trigger to load the wire through the gun.
Set the welding parameters:
1. Adjust wire feed speed with the RIGHT KNOB.
2. Adjust arc voltage with the LEFT KNOB.
(GMAW only) Turn on the gas cylinder, pull the trigger to check for gas flow and adjust the flow rate.
Bring the gun close to the workpiece and press the trigger.
Gas Selection
Setup for MIG (GMAW) & Flux-Cored Wire (FCAW) Welding
220 MP MIG SET-UP CHART
MIG (GMAW)
Material
Thickness
18GA (1.2mm)
16GA (1.6mm)
14GA (2.0mm)
1/8" (3.2mm)
3/16" (4.8mm)
1/4" (6.4mm)
5/16" (7.9mm)
3/8" (9.53mm)
Polarity
Wire
Diameter
ER70S-6
Solid Wire
AR75%/CO25%
DCEP
.030"
16-17 150-175 17-18 220-250 17-18 250-340 17.5-19 300-350 18-19 330-400 - - - - - -
.035"
16-17 140-160 17-18 180-220 17-18 240-260 18-19 280-300 18-19 320-340 21-22 360-380 21-22 400-420 23-24 420-520
E71T-GS
Flux-Core
No Gas
DCEN
.030"
- - - - 14-15 165-190 14-15 190-215 15-16 220-235 - - - - - -
.035"
- - - - 14-15 145-155 14-15 175-185 15-16 205-215 15-16 220-230 16-17 235-245 16-17 245-255
ER4043
Aluminum
100% Argon
DCEP
.030"
- - 14-16 320-340 15-17 360-380 22-24 450-480 24-26 490-520 - - - - - -
.035”
- - - - 14-16 260-290 21-22 350-400 23-24 430-450 24-25 350-375 - - - -
CAN WELD ALUMINUM WITH SPOOL GUN

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