Airman 1st Class Webb Travis, 28th Maintenance Squadron aircraft metals technology technician, uses tungsten inert gas to weld a panel for a bomb loader during repairs at Ellsworth Air Force Base, S.D., Jan. 26, 2011. TIG welding is a precise form of welding that can be performed on a variety of metals. (U.S. Air Force photo/Senior Airman Kasey Close)