EN EE WAS REPAIRING A CRACK ON THE FRAME OF A 190-TON HAUL TRUCK. HE HAD POSITIONED HIMSELF BELOW THE CRACK WELDING OVERHEAD. HE HAD COMPLETED A PASS AND USED A METAL CHIPPED TO REMOVE SLAG. H IS WELDING HOOD WAS DOWN. HE FLIPPED HIS HOOD UP TO INSPECT THE WELD. HE BEGAN CHIPPING SLAG WITH HIS HOOD UP AND HIS SAFETY GLASSES ON WHILE CHIPPING. A PIECE OF SLAG IMPACTED HIS RIGHT EYE.