WELDING WORK U.S. Air Force Airman 1st Class Jordan Barfield uses tungsten inert gas to weld a nitrogen cart booster stand on Aviano Air Base in Italy, April 8, 2015. Barfield is an aircraft metals technology journeyman assigned to the 31st Maintenance Squadron. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 251942-H-AWG55-065.jpg Photo Gallery