Trying to weld, I’m terrible!

I have to use .030 flux wire because I have no place to weld out of the breeze and other issues with my 30 year old mig. NO gas.
I screw the sheets down with small metal screws, and pretty much spot weld till I get it covered. Also realize if you are welding a new sheet to an old sheet that has somewhat rusted over the decades it is thin!
Good thing is all I ever have to do is smaller patches, NO quarters, just floor pans are the biggest pieces.
There is a lot of difference in how a good machine does over one with issues>