Hey, I dont know if this is the right place but I have been working at a job for over a year now and in our shop we have 2 mig welders running. the shop is about 200 feet by 50 feet, probably your average size shop. We weld tech fence together for use in the oilfield. Although one thing I dont appreciate is we have absolutely zero ventilation, so the welding smoke, cutting smoke, and paint fumes really all build up inside, so much that you can see smoke everywhere you look, and not just a small amount. Lately we have gotten a new welder and he wont even let us open the doors for the small bit of ventilation it provides because he says the weather gives him bad welds. He has welding screens surrounding him, its not windy outside so its not windy in the shop or near him for sure, and its around 0 degrees celsuis on average right now. so i really dont think its the weather giving him bad welds. But it is true, i have never seen anybody weld as bad as him or miss as many welds as he has in my life... thats for sure. O and to add hes not actually a certified welder just a farmer welder who thinks he knows what hes doing. Our one welder, who is the better welder says that he does'nt care if the doors are open or not. Can anybody help me out? should i be able to open the doors for ventilation? Its hard as hell to breathe and I really notice my lungs in my marathon running =(

I have a very old large bench vise, and one of the internal parts that is cast, and tapped for a mild steel bolt to screw into has broken where the bolt screws into such. It is split down the middle of the internal threads. I have a 3/8" X 16 thread per inch stud that I would like to WELD to the cast part where it is broken. Can this be done with SOME SUCCESS? Thank You, Dale in Indy