Let the sparks fly: 2nd MXS welder certification
Staff Sgt. Josh Martinez, 2nd Maintenance Squadron, non-destructive inspection NCO in-charge, tapes an identification tag onto an aluminum tube being tested for cracks on Barksdale Air Force Base, La., March. 25, 2014. NDI Airmen inspect for cracks within the weld, proper penetration into the weld and porosity, which is gas formations that did not escape prior to the weld. (U.S. Air Force photo/Staff Sgt. Jason McCasland)
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