A NON CONTACT DEVICE BASED ON MACHINE VISION FOR THE MEASUREMENT OF ROOT GAP IN WELDED JOINTS

摘要

This invention relates to a device for measuring the weld root gap and the gap between the two top edges in a weld consisting of a camera (2), two light sources (3) placed at two different locations, a shroud (4) covering the weld zone and a computer operated through a image processing software when the shroud shielding the image from external light by covering on all the four sides of the camera, wherein the computer collects the image through the camera, the collected image being processes by the image processing software on standard edge detection operations by cropping up first image to include only root portion (zone 2) excluding the top edge, using the cropped zone 2 for edge detection to detect the root (zone 3), cropping a second image (zone 1) to detect the top edges and converting the resultant image to binary image thus detecting the root gap and the distance between top edges.