As long as it is sized properly you could be OK. I didn't want you to use a standard orange 16 gauge extension cord. Buy one dedicated, get the largest wire size you can find, and don't go over 50' tops. Just looking out.
What do you think the wire in your wall is on a 120v plug? 14 gauge...and could be run for 100+ feet and at the end of a dozen outlets/connections.
There's nothing wrong with using an extension cord for a welder if properly sized, it's not just "OK", it's absolutely fine.


