Robust Schedules for Spot Welding Zinc-Coated Advanced High-Strength Automotive Steels
Bibliographic record
Abstract
<p>Spot welding is the prominent joining process for assembling steels in vehicles. Spot weldability is measured in terms of weld lobes. A wider (robust) lobe represents better weldability. Unfortunately, recently developed advanced high-strength steels (AHSS) exhibit poor spot weldability (narrow weld lobes) with conventional weld schedules. The present work is thus aimed to develop a robust spot welding schedule for selected AHSS combinations.</p> <p>Weld lobes were plotted with upsloping pulse, single pulse and multiple pulse weld schedules. Nugget growth study for zinc coated Dual Phase (DP) 600 was conducted. Fast nugget growth in DP600 steels was controlled by interrupting the heat input during a weld pulse. An enhanced weld schedule consisting of two pulses with reduced current on the second pulse was designed. It was found that the first pulse removed zinc and the second pulse controlled the nugget growth. The enhanced weld schedule showed a considerable increase in the lobe width over the conventional weld schedule for DP600 steels.</p>
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How this classification was reachedexpand
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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".