Microstructures and properties of Mg alloy/DP600 steel dissimilar refill friction stir spot welds
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Bibliographic record
Abstract
Joining of ZEK100 Mg alloy and Zn coated DP600 steel sheets is studied using refill friction stir spot welding (RFSSW). The RFSSW process involves a tool with independently moving sleeve and pin components, which rotate at a constant speed and penetrate into only the top sheet. Welds could be achieved, which exceeded 4.7 kN shear strength, using the following process parameters: 1800 rev min − 1 tool speed, 3.0 s welding time and 1.5 mm of penetration into the upper ZEK100 sheet. Scanning electron (SEM) and transmission electron microscopy (TEM) are used to characterise the Mg/steel interface. It is revealed that a continuous layer of FeAl 2 particles accommodate bonding of the sheets, which appears to have originated from the galvanised coating on the DP600.
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Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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