I have worked 20 years in heavy metal industry.
I like the manufacturing part. Plate work / assembly etc.
We make parts for the paper machines, gas turbines and propulsion systems.

Paper machine parts are mostly acid proof steel, nice to work with, less dust and smaller welding joints.

Gas turbines and ship motor parts needs to be pre-heated to 100-250 degrees of celsius.
That makes it not so fun, sometimes. ☺
But most times i like it, we make multiple different and big parts, so it doesn't get boring.
If you study and become a professional, get a job from a shop what makes special parts.
Its possible to get well paid. And usually its more cleaner too.