I used to work at worthington cylinders and I can tell you from experience that there is a reason they are always looking to hire, the pay is shitty (at least ten years ago when I worked there), and they act like slave drivers (they used to give me shit for going to take a piss). They also tend to hire a lot of temps and lay them off in 6 months to a year so they can keep the costs of employment down, at least that's what I observed when I worked there.
Now back on topic, welding is a pretty cool trade and it can pay well. My question is for you though, is this something you want to do for the rest of your life? It's a good skill to have for a hobby or to do it for a couple hours a day, but doing it for 8 hours a day for 20 years or so will cause sight problems still. I did it for 8 hours a day for 2 years and I already notice a slight change in my eyesight, so I recently changed jobs to prevent any further damage. I'm not trying to talk you out of it, just trying to give you something to think about.