AN AXIS SHIFT DISTORTION MEASUREMENT SYSTEM TO MEASURE THE DISTORTION INDUCED DURING CIRCUMFERENTIAL WELDING ON A LARGE THICK-WALLED CIRCULAR SHELL COMPONENT OF PRESSURE VESSEL

摘要

The invention relates to an axis shift distortion measurement system to measure the distortion induced during circumferential welding on a large thick-walled circular shell component of pressure vessel, comprising : a frame member (6) enriching a first and a second cylindrical shell (1 & 2) to be welded in an welding arrangement, the frame member (6) forming an annular free space around the shells; a plurality of displacement sensors (7) disposed around the shells (1 & 2); multiple support members (8) supporting the frame member (6) and rigidly locating the sensors (7) to establish a full contact around the shells (1 & 2);a movable table (9) accommodating the assembly of sensors and frame (6 & 7), the movable table (9) housing a data acquisition device (10) having a data logger and computer apparatus; an optical cable (11) connecting the data acquisition device (10) and the sensors (7), wherein the sensors (7) are enabled to sense an axis shift distortion experienced at the end of the large shell (2) during welding, and wherein the distortion data sensed at different segment around the shell (2) are processed and displayed in the data acquisition device (10). {FIGURE 3}