Ms. Jin Zhang Profile

Jin Zhang

at Lanzhou Univ of Technology

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Proceedings Article | 8 June 2012 Paper

A SVM regression predicting model for indentation depth of welding spot based on digital image processing

Jin Zhang, Peng-xian Zhang

Proceedings Volume 8334, 83342H (2012) https://doi.org/10.1117/12.956422

KEYWORDS: Electrodes, Digital image processing, Evolutionary algorithms, Image quality, Resistance, Digital imaging, Sensors, Image analysis, Cameras, Artificial intelligence

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The indentation depth of resistance spot welding joint is closely related to its quality, and the digital image of its surface is used as an information source. An evaluating algorithm of artificial intelligence for the indentation depth is put forward. Firstly, through analyzing characteristics of images on the surface of spot welding joints, the first ring area S₁, the second ring area S₂, total area S, the area ratio coefficient between total area and first ring area K₁, and the area ratio coefficient between total area and second ring area K₂ are extracted as evaluation factors of indentation depth. At the same time, S₂, S, K₁ are selected as characteristic parameters of the indentation depth based on the correlation analysis between the evaluation factors and the indentation depth. Secondly, a support vector machine (SVM) predicting model of the indentation depth is established. The model selects the parameters S₂, S, K₁, welding current I, and electrode pressure F as the input vector and selects the actual indentation depth h_T of welding spot as the target vector. Test results are shown, the correlation coefficient are 0.9958 between model prediction values and actual measured values. The indentation depth of welding spot can be predicted by means of the SVM evaluating algorithm.

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