This is part 4 of his series fabricating a belt grinder

Been doing stick welding for a bit, but when it comes to thin steel such as on cars, sticks blow right through. I was thinking about getting a flux core machine to do some exhaust work on my car because I don't want to mess with gas.

What should I know about flux core? What are the biggest cons about it?

-pulling my hair out-

Press for hub assembly did not work due to not having correct shim, so make one your self I said!

I'm going to learn some welding and I've bought myself an auto darkening helmet. I tested it my holding it up to the sun, and it darkens, but stops darkening right away (depending on the delay I set). Also tried with a powerful flashlight and it does the same. Also left it outside for a while for the solar panel to maybe charge the battery, no dice. Is my helmet is defective or is it going to work as intended with real welding?

I need to weld some nuts to a steel tube. Are there any issues with using regular zinc coated nuts or are there other, plain steel nuts I should be using?