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Before Each Use - Klutch MIG 140i Owner's Manual

120v inverter mig welder
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6.7 GAS SELECTION
Different materials require different shielding gas when MIG welding, refer to the set-up chart inside the
wire feed compartment.
Mild Steel: Use 75% Argon and 25% CO2 for reduced spatter and reduced penetration for thinner
materials. Do NOT USE Argon gas concentrations higher than 75% on steel. The result will be poor
penetration, porosity, and brittleness of weld.
Mild Steel: Use CO2 for deeper penetration but increased spatter. (A CO2 regulator adapter will be
needed.)
Stainless Steel: Use a mixed gas consisting of Helium, Argon, and CO2.
Aluminum or Bronze: Use 100% Argon.
7. CHANGING THE POLARITY
a. Polarity Changing - When MIG wire is used, shielding gas is required and the polarity on
this unit needs to be electrode positive.
b. Electrode Positive for MIG Welding - The Weld Power Cable should be connected to the
positive (+) weld output connection on the front of the machine. The ground cable would
then be connected to the negative (-) weld output connection.
c. Electrode Negative for Flux Core Welding - The Weld Power Cable should be connected
to the negative (-) weld output connection on the front of the machine. The ground cable
would then be connected to the positive (+) weld output connection. Refer to the polarity
setting label inside the wire compartment.
ELECTRIC SHOCK CAN KILL!
Touching live electrical parts can cause fatal shocks or severe burns. Do not touch live electrical
parts.
Wear dry, hole-free insulating gloves and body protection.
Disconnect input power before installing, maintaining or servicing this equipment. Lockout/tag out
input power according to OSHA 29 CFR 1910.147.
1. Review the contents of this manual and follow all safety warnings and cautions.
2. Inspect all cords and power cables. Replace any cords or power cables that are damaged or
cracked.
3. Make certain your equipment is in good working order.
4. Make sure the area is clean, dry, and ventilated. Do not operate the welder in humid, wet, or poorly
ventilated areas.
5. Always be aware of your work environment. Be sure to keep other people, especially children and
animals, away from you while welding.

Before Each Use

⚠WARNING
Page 18 of 31

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