Rough set modeling method is a new and promising modeling method in welding field. Discretization plays an important role in that method. Considering the character of welding process and the rough set method, proper evaluation standards for discretiztion were discussed. To compare discretization algorithm, raw data of welding process were sampled by special designed sensor system, and the comparison method was designed. The input variable discretization and the output variable discretization were discussed respectively. At last, influencing factors for discretization were analysizsed.
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