Investigation of Electrode Cap Life Made of New Cu–Cr–Zr Copper Alloys with Scandium Addition Dedicated for Resistance Spot Welding of Galvanized Steel Sheets
Krystian Franczak, Paweł Kwaśniewski, Grzegorz Kiesiewicz, Wojciech Ściężor, Michał Sadzikowski, Szymon Kordaszewski, Piotr Micek, Damian Kuca, Rafał Pestrak
TL;DR
New copper alloys with scandium improve electrode life and weld quality in resistance spot welding of galvanized steel.
Contribution
Scandium-modified Cu–Cr–Zr alloys show enhanced hardness and reduced degradation in resistance spot welding electrodes.
Findings
Scandium additions increase hardness with minimal impact on electrical conductivity.
Sc-modified electrodes reduce diffusion layer thickness and material loss compared to commercial alloys.
Electrodes meet strength requirements after 500 welds, improving industrial RSW performance.
Abstract
This study presents results on developing new copper alloys for electrode caps used in resistance spot welding (RSW) of galvanized steel sheets. Two copper alloys—CuCr0.7Zr0.05 and CuCr0.3Ni0.1Zr0.05—were modified with scandium (Sc) additions of 0.01 and 0.05 wt. %. Within this article, the influence of scandium content on Vickers hardness (HV) and electrical conductivity during alloy aging was investigated. In addition, the electrode life of the produced electrodes was subjected to detailed analysis. The results demonstrated that Sc modification enables an increase in hardness with only a minimal decrease in electrical conductivity. Moreover, Sc-modified electrodes exhibited a significantly reduced diffusion layer thickness in the electrode material, which led to lower degradation of the working face geometry and reduced material loss compared with commercial Cu–Cr–Zr electrodes.…
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Taxonomy
TopicsAdvanced Welding Techniques Analysis · Electrodeposition and Electroless Coatings · Advancements in Materials Engineering