I had a friend send me a video of one of the laser rust remover gizmos that a shop he visited had. He said it worked real well, but the owner said it cost like $15,000.
IMO you're not going to get a decent welder for $100, except maybe a cheapo flux core welder. That was my first machine many years ago.
I doubt it would weld much more than maybe some sheet metal. My 120V MIG machine (~100A max capacity IIRC) isn't really powerful enough for more than sheet metal. I use my Tombstone Lincoln 225A for that kind of stuff.
But you can blow in $100 and be our tester.
Be careful about ordering from some unknown website. Use a credit card that you can dispute the charge when they stiff you or you start seeing bogus charges.
