I just love welding photos and this is really good! I entered one in the last Heat challenge and it got decidedly snubbed. I would have had this one on the front page -- but the voters obviously disagree with us about what makes a cool heat photo, don't they!
I had a similar shot of my own that I had considered for this challenge, but bringing out the details from the darkness created more noise than I wanted to have in a challenge entry. Yours is nice and clear. Good job on this.