Process Considerations in Reducing Voiding in High Reliability Lead Free Solder Joints
Bibliographic record
Abstract
ABSTRACT This paper is in English and Chinese languages. With the increasing transition of European and American automotive OEMs to ROHS compliant soldering materials, high reliability tin/silver/copper alloys have been widely examined. One six part alloy known as Innolot has become widely adapted because of its high resistance to thermal cycle fatigue and resistance to high temperature creep. Examining data from numerous field trials has shown that solder pastes using Innolot alloy tend to produce more voids in bottom terminated components (BTCs) when compared to the same paste flux vehicle used with SAC 305 alloy. Several techniques have been reported for reducing voids in BGA components, but many of these techniques do not seem to reduce voiding when Innolot solder paste is used in conjunction with BTCs. Video data showing the formation of voids in a simulated BTC reflow process led to the development of a different type of reflow profile strategy. Data mining of field reports indicated that this strategy had worked several times without the need to reflow the solder joint under vacuum. A controlled experiment using five different reflow profiles and a previously used BTC voiding test vehicle was undertaken to validate the field observations. This paper will show the field data and the results of the controlled experiments, giving the reader a new reflow strategy for reducing BTC voids when using Innolot based solder paste.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 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".