One note: if you have a MIG welding rig you can use flux cored wire in it without a shielding gas, which simplifies things somewhat if you're an occasional weld

One note: if you have a MIG welding rig you can use flux cored wire in it without a shielding gas, which simplifies things somewhat if you're an occasional welder. Just make sure to adjust the polarity settings correctly when you do (there are tons of videos on youtube explaining how and why).