Fast inspection of flange faces of welded tubes using photogrammetry and auxiliary measuring tools.

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    • Abstract:
      • An Auxiliary Measuring Tool (AMT) with elaborate structure is designed, which can represent the center, normal and in-plane rotation of the flange face in different styles and sizes. • A novel method for calibrating the AMT is proposed. • An efficient photogrammetry-based approach to attitude inspection of the flange faces on multi-branch welded tubes is put forward using the AMT. • Experiments demonstrate the high performance of the proposed method on real welded tubes. The attitudes (including positions and orientations) of flange faces on a multi-branch welded tube are critical to tube installation quality. However, it lacks appropriate approach for flange attitudes inspection. Given the inspection requirements, a novel Auxiliary Measuring Tool (AMT) is designed. A photogrammetry-based approach is put forward to inspect the attitude errors of the flange faces with the aid of the AMT. The specifically designed AMT can achieve flange face centering through a three-jaw chuck structure and establish in-plane rotation by employing a slider to locate the reference bolt hole. An ingenious calibration method is proposed to establish the AMT coordinate frame (ACF) and obtain the marker points' coordinates in ACF. With the calibrated AMTs attached to each flange, the flange attitude error can be efficiently evaluated by simply capturing a set of images of the tube. Experiments on two welded tubes demonstrate the high performance of the proposed method. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Copyright of Measurement (02632241) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)