In an effort to better characterize and classifyaustenitic stainless steel resistance upset welds, standard methodshave been examined and alternative methods investigated. Opticalmicroscopy yields subjective classification due to deformationobscured bond lines and individual perception. The use ofspecimen preparatoins that better reveal grain boundaries aids insubstantiating optical information. Electron microscopytechniques produce quantitative information in relation tomicrostructural constituents. Orientation Imaging Microscopy(OIM) is a relatively new technique for obtaining objective,quantitative information pertaining to weld integrity, i.e., percentgrain boundary growth across the interface.
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