Influence of polarity on mechanical properties of dissimilar resistance spot welds of DP 600/AISI 304 steels |
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| Authors: | Alejandro Espinel Hernández Hipólito Carvajal Fals Valtair Antonio Ferraresi Louriel Oliveira Vilarinho |
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| Affiliation: | 1. Faculty of Mechanical Engineering, University of Oriente, Santiago de Cuba, Cuba;2. Faculty of Mechanical Engineering, University of Uberlandia, Minas Gerais, Brazil |
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| Abstract: | The influence of polarity during resistance spot weld (RSW) of dissimilar lap joints on mechanical properties and failure mode is assessed in this work. A dissimilar lap joint was set using DP 600 dual phase steel with AISI 304 stainless steel. The experiments were performed on a medium-frequency direct current spot welding machine with proper data acquisition of voltage and welding current. Temperature evolution was also acquired by using IR camera. The mechanical properties of spot welds were evaluated by using a coach peel testing. The effect of welding current and welding time on mechanical properties was also evaluated. Correlations between polarity with the welding nugget size, failure mode, tensile strength, temperature evolution and dynamic resistance were analysed. The analysis confirmed that the polarity on dissimilar lap joints affects the behaviour of dissimilar RSWs. |
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| Keywords: | Polarity Dissimilar Resistance spot welding Failure mode High strength steel Mechanical testing DP 600 |
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