Welder Question

[19SIKtySix]

Hopefully somebody can help me out...I have a 110v Snapon welder that I'm having some issues with. I hooked it up to give it a try and was getting a lot of pop on my welds. I double checked the ground and my gas pressure (it was about 17psi) but no luck.

Now this welder has been put thru it's fair share of work and was stored outside but under cover, so I thought it was time to replace it. However, before I go and purchase another welder, I want to make sure it's not a power problem.

My question is, could I be plugging into an outlet and the welder not be getting enough power? Anybody know of a way I can check the load on a breaker? My garage has about 12 plugs in it (some are GFIs, which is what I had it plugged in to), I was hoping to find a way to verify the welder is getting enough juice.