Abstract
In this study, the resistance spot weldability of DP450 steel and aluminum alloys (AA1050, AA6061 and AA7075) was investigated and the interfacial characteristics of fracture zones was examined via microanalysis, scanning electron microscopy and energy dispersive spectroscopy (EDX). In addition, tensile shear load tests and hardness tests were performed to determine the mechanical properties and fracture behavior of welded joints. These results suggest that the tensile shear strength of the DP450/AA1050 and DP450/AA7075 joints was not affected by the reaction layer formed at the welding interface. This indicates that the spot weldability of DP450/AA6061 is better than DP450/AA1050 and DP450/AA7075 Al alloys.
Kurzfassung
In der diesem Beitrag zugrunde liegenden Studie wurde die Schweißbarkeit eines DP450 Stahls und Aluminiumlegierungen (AA1050, AA6061 and AA7075) bezüglich des Widerstandspunktschweißens untersucht und die Grenzflächencharakteristika der Bruchflächenzonen mittels Mikroanalyse, Rasterelektronenmikroskopie und energiedispersiver Spektroskopie (EDX) untersucht. Zusätzlich wurden Zugscherversuche und Härtemessungen durchgeführt, um die mechanischen Eigenschaften und das Bruchverhalten der geschweißten Verbindungen zu bestimmen. Die Ergebnisse weisen darauf hin, dass die Zugscherfestigkeit der Verbindungen DP450/AA1050 und DP450/AA7075 nicht durch die Reaktionsschicht an der Schweißnahtgrenzfläche beeinflusst wurde. Dies zeigt, dass die Widerstandspunkt-Schweißbarkeit der Verbindung DP450/AA6061 besser als die der Verbindungen DP450/AA1050 und DP450/AA7075 ist.
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