Gasless ('MIG') Welding – What is the correct polarity?
Can’t remember which terminals the torch & earth clamp go to? Wire not running properly? Poor penetration?
Don’t stress – even the most experienced welders can get it wrong! If your gasless welding wire is not running properly, or has poor penetration, then there’s a good chance that the polarity is wrong.
When running gasless welding wire – connect the Earth to positive and Torch to negative, otherwise known as "DC electrode negative", or "straight polarity".
(This is the opposite to standard MIG welding with gas, which is torch/wire positive and earth negative).
Earth to Positive (+)
Connect the earth lead to the positive (+) terminal on the front of your welder.
Torch to Negative (-)
The polarity connections for the torch are commonly found either on the inside of the welder (near the wire drive system as shown below) or on the front of the welder.
Usually there will be a short lead that can be connected to either a positive or negative terminal. Connect this to the Negative (-) terminal.
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This blog is intended to help with: What is the correct polarity for MIG welding without gas? // Where should I connect the earth lead when using gasless MIG wire?
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Date: 18-04-2020Graeme Coates
Date: 04-12-2019Bruce Spence Community College Northern Inland
Date: 08-04-2019Matthew welderpedia