WELDERS WERE POSITIONING A DRAGLINE SHOE WEAR BAR (WEIGHT APPROX 1300 LBS) WITH THE WELDING TRUCK HYDRAULIC CRANE. THE WEAR BAR HUNG UP AND EMPLOYEE GRABBED THE END OF THE WEAR BAR TO HELP F REE IT. THE WEAR BAR MOVED UNEXPECTEDLY AND CRUSHED HIS LEFT HAND BETWEEN A GUSSET AND THE END OF THE WEAR BAR.