The objective of this paper is twofold. The first is to investigate the magnitudes of variation in spot weld position in automotive industry. The second is to analyze how this variation in spot weld position affects the geometrical variation of the final assembly. By scanning spot-welded assemblies from a Swedish automotive manufacturer it was found that the deviation between nominal and actual spot positions amounted to up to 19 mm. The mean deviation was 9 mm. The figures in themselves are less important than the fact that there really is a non-negligible deviation from nominal for the main part of the spot welds. To investigate how this variation in spot weld position affects the final assembly with respect to geometrical quality, a variation simulation was conducted. In the simulation, a case study which previously has been validated using industrial inspection data was used. The results showed that the variation in spot weld position actually has quite a large influence on variation of the final assembly. For the inspection points most sensitive to this kind of variation, 6s amounted to 2.8 mm, showing that the variations in spot weld positions contribute greatly to the degree of geometrical quality of the final assembly.
The influence of spot weld position variation on geometrical quality
2012
4 Seiten, 6 Bilder, 23 Quellen
Conference paper
English
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