Accelerated Thermal Cycling of Tin-Lead and Lead-Free Solder Joints
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
ABSTRACT The reliability of a lead-free solder (Sn3.8Ag0.7Cu) was compared with that of tin-lead solder (Sn63Pb) using two test vehicles: (i) resistor 2512 and (ii) PBGA 256 (plastic ball grid array). These test vehicles were similar to those used in a recent NEMI (National Electronic Manufacturing Initiative, Inc.) investigation of lead-free solders. Accelerated thermal cycling was conducted over the temperature range of 0 to 100°C with 10∼14°C/min ramp rate, and 6 minutes dwell. It was found that the lead-free solder joints had better creep-fatigue performance than tin-lead joints and that similar failure modes occurred. The number of cycles to failure was significantly correlated to the initial number and size of voids in the solder. Failed joints were cross-sectioned and imaged using optical and scanning electron microscopy.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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