THE EMPLOYEE WAS USING A 7"" METAL GRINDER TO CUTLOOSE TACK WELDS ON A CHUTE PIECE. THE EMPLOYEE GROUND THE WELD OFF AND AS THE WELD CAME APART THE GRINDER HUNG UP FOR A SECOND AND THEN JERKED AROUND AND CUT THE EMPLOYEE'S LEFT WRIST. THE EMPLOYEE RECEIVED 7 STITCHES TO CLOSE THE LACER-ATION AND RETURNED TO WORK THE NEXT DAY REGULAR DUTY.