I consider a CO2 Fire extinguisher as standard as a metal brush. Keep it just as close as your brush and the pin out. I used to TiG and the fire risk is at le

I consider a CO2 Fire extinguisher as standard as a metal brush. Keep it just as close as your brush and the pin out. I used to TiG and the fire risk is at least predictable and reasonably avoidable. With a MiG, you can start a fire 8 feet away. The auto-dark can be a mixed bag as you leave it down longer and less likely to notice a fire due to the field of view that you mention. I'm not sure how you would build a fire alarm. Coatings tend to smoke so detecting ionized air would probably just drive you nuts.