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Automatic weld bead extraction from digitised radiographs using grey level intensity profiles and least-squares fitting

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Weld bead segmentation is an important precursor to automatic detection of weld defects in digitised radiographs. This paper presents a simple and effective approach for the segmentation of the weld bead from a digitised weld radiograph using grey level intensity profles. The intensity profles were extracted across the weld and divided into two parts based on the maximum intensity. Least-squares lines were ftted to the data points in each half of the profle using a predefned range threshold. Using an error threshold, the weld bead boundary points were detected. For radiographs having undercut defects, an alternative approach based on a straight line connecting the minimum trough intensity pixel and the maximum distance from the original profle is proposed. The weld bead segmentation algorithm has been successfully tested on 30 digitised weld radiographs having various defects.
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Keywords: Weld bead extraction; intensity profle; radiograph

Document Type: Research Article

Affiliations: 1 School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.

Publication date: January 1, 2008

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