THE EMPLOYEE WHO IS A WELDER WAS FITTING A PIECEOF SHEET METAL INTO THE CORNER OF A TOOL BOX ON A WATER TRUCK. HE HAD REMOVED HIS LEFT GLOVE TO BETTER POSITION THE PIECE. BEFORE WELDING WHEN I T SLIPPED, SLICING HIS LEFT THUMB. REQUIRED 6 STITCHES TO CLOSE. DOCTOR RELEASED HIM IMMEDIATELY WITH NO RESTRICTIONS.