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Analyzing the Electrical Signals to Understand the Corrosion Presence in Dissimilar Spot Welds Using Austenitic Stainless Steels and Carbon Steels
Abstract
Welding austenitic stainless steel (ASS) together with carbon steel (CS) is a common practice in spot welding research, but there is a lack of information about the effect of corrosion pertaining to the dynamic resistance, and therefore some surface-corroded carbon steel plates are intentionally welded together with 304L austenitic stainless-steel plates. The welded samples underwent the tensile shear test, hardness test, metallurgical observation, and electrical signal interpretation. Bonding strengths and hardness distributions are both significantly affected by corrosion presence, which reduces the weld strength in overall measure. Microscopic examinations show that the corrosion has randomly scattered around the vicinity of weld nuggets while the electrical signal distinguishes the corroded weld over good welds in terms of electrical resistances.
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