Tensile properties and microstructural features of friction stir welded Al 6061 joints fabricated by various dual-pin tool shapes
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Bibliographic record
Abstract
This study investigates the influence of tool shapes on tensile properties and microstructural features at stirred zone (SZ) and heat-affected zone of Al 6061 joints welded through friction stir welding (FSW) technique. Six novel dual-pin FSW tools were designed and fabricated consisting of two eccentric pins with different shapes of circle–circle, triangle–triangle (TT), rectangle–rectangle, and the combined pins of circle–triangle, circle–rectangle, and triangle–rectangle. Quasi-static tests were conducted on the welded joint samples and stress–strain data were collected. Dual-pin welding tools led to microstructural evolution including growth in the plastic flow and enlargement in SZ. Weld joints fabricated by TT and rectangle-triangle (RT) tools possessed the maximum values of tensile strength and ductility.
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Full frame distilled prediction
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 | 0.000 | 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)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it