Evaluation of Electrode Degradation and Projection Weld Strength in the Joining of Steel Nuts to Galvanized Advanced High Strength Steel
| Autor: | Kevin R. Chan, Pablo D. Enrique, Hashem Al Momani, C. DiGiovanni, Zhen Jiao, Norman Y. Zhou |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
0209 industrial biotechnology Materials science Mechanical Engineering High strength steel 02 engineering and technology Welding 01 natural sciences Industrial and Manufacturing Engineering Galvanization Computer Science Applications law.invention Electrode degradation symbols.namesake 020901 industrial engineering & automation Control and Systems Engineering law 0103 physical sciences symbols Composite material Weld strength Projection (set theory) |
| Zdroj: | Journal of Manufacturing Science and Engineering. 141 |
| ISSN: | 1528-8935 1087-1357 |
| DOI: | 10.1115/1.4044253 |
| Popis: | Projection welding of steel weld nuts to advanced high strength steel (AHSS) in automotive applications allows for the reliable mounting of critical components with different thicknesses to the vehicle body. However, the galvanized coatings commonly used on AHSS result in electrode surface degradation during welding. In this study, the electrode degradation and its effect on the mechanical properties of welded steel nuts and AHSS sheets are investigated. Two common electrode materials are tungsten/copper and beryllium-free class III copper—both display the formation of an oxidized alloy surface layer and pitting as weld number increases. Unlike resistance spot welding, where electrodes grow in the contact area diameter as they degrade, projection welding electrodes do not experience this type of mechanical degradation. Instead, increased resistance at the electrode interface with increasing weld number results in higher temperatures at the weld interface and a larger fusion zone size, which is responsible for an observed 30% increase in weld strength over the span of 10,000 welds. |
| Databáze: | OpenAIRE |
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