inner mandrel used in an assembling operation end to end two tube sections by welding

RESPECT THE INVENTION CHUCK INTERNAL 22 COOPERATING WITH THE OPERATION OF ASSEMBLY BY WELDING OF TWO SUCCESSIVE SECTIONS TUBES AND IS CHARACTERIZED BY CHUCK THIS INCLUDES AREAS 25, 26, 27 LENGTHWISE SEPARATE, ALLOCATED RESPECTIVELY DOCKING, WELDING AND WELDING INSPECTION, AND NOT BY MEANS OF MOVEMENT CHUCK FOR 22 TO IT TO SUBMIT TURN THESE AREAS IN FRONT OF THE SAME WORK STATION.