Nobody picked the "blue" option so you forced me to make a speed art.
Each one of the 7 colors I used has the hue value equals to 240 (blue).
(My entry for the Monochromatic Masterpiece weekly challenge)
The wavy lines in the background are a creative way of showing heat. Nice work!
I think the Blue theme would be the most difficult to pull of when you think about it in a conventional way
but you chose something that does work quite well
I personally would never have thought about using Welding although it does make the most sense
Great work like always