MIG welding is also called as Gas Metal Arc Welding (GMAW) is a type of welding that is done using a continuously fed MIG wire electrode and a shielding gas that melts and deposits the workpiece metal in the weld joint. The shielding gas that is fed through the welding gun helps in protecting the workpiece from getting contaminated by the various contaminants in the air. Mig welding will create sparks which can ignite the dust or fumes. DO NOT EXPOSE THE MIG WELDER TO RAIN OR USE IT IN WET CONDITIONS: Water enter-ing the mig welder will greatly increase the risk of electric shock. HAVE YOUR MIG WELDER REPAIRED BY A QUALIFIED PERSON: The mig welder is in ac-cordance with the relevant safety requirements.

• Mig Welder Settings Chart
• Mig Welder Settings For Exhaust
• Miller Mig Welder 150

If you’re confused about which MIG welding polarity settings you should be using for flux core wire, and for solid wire…

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…then this article will quickly clear things up for you.

Here’s why it’s so important to set polarity for mig welding correctly…

If you’re using your MIG welder with flux core wire, and you have it set on the wrong polarity, you’ll quickly notice that your welds will look nasty, like this…

You’ll notice lots of spatter. This image was from using flux core wire on the wrong polarity setting.

If you want to avoid this headache, then make sure you switch your MIG welding polarity settings any time you change from solid wire to flux core wire.

If you’re not sure what the difference is between using solid MIG welding wire, and gasless (or flux core wire), it’s pretty simple.

We use solid wire when we’re using a shielding gas, and that’s typically C25 gas (25% carbon dioxide and 75% argon) when welding mild steel.

For other processes like aluminum you would use 100% argon shielding gas.

The reason we use gas is because it shields the weld puddle from the contaminents in the atmosphere that can wreak havoc on the weld appearance and strength.

With flux core wire, there’s no need for using a shielding gas because the shielding agent is inside the wire, and when the arc starts it acts as the shielding agent.

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Mig Welder Settings Chart

Direct Current Electrode Negative

So, for gasless MIG welding polarity (when using flux core wire), your MIG welding polarity settings should be set to direct current electrode negative (or DCEN).

With DCEN, the negative terminal inside your machine is hooked up to your electrode (your MIG gun) while the positive terminal is hooked up to your ground.

Electrons flow from negative to positive, so with DCEN the electrons are traveling from the machine to the MIG gun. They then travel through the workpiece and ground cable, then back to the machine.

It’s opposite for DCEP.

Direct Current Electrode Positive

Mig Welder Settings For Exhaust

For DCEP, you now have your positive terminal hooked up to your electrode. The electrons now travel in the reverse direction (from the machine through the ground cable, and back in through the MIG gun.)

Miller Mig Welder 150

I hope this helps you with your MIG welding polarity change.