Jose -Thanks for posting this video. It brings back memories of long nights at the shop. I worked for Tri-State Oil Tools back in the '80's and was taught how to do this type of welding. Some of the tools were so big we ended up using #10 rosebuds to apply the Tungsten sometimes for 10 to 12 hours or more. Exhausting work, but we loved it. Oh To Be Young Again, haha. I'd love to see more if you get the urge.