Effects of internal design geometry in de laval nozzles for off-axis assist gas injection on inert-gas laser cutting performance
Bibliographic record
Abstract
The aerodynamic interactions of the assist gas during fusion laser cutting are an essential parameter determining cutting performance. This subject has been object of multiple studies to determine the influence of the assist gas jet interactions with the workpiece in order to design assist gas injection systems which surpass the drawbacks exhibited by conventional cutting heads. Cutting heads incorporating off-axis de Laval nozzles to inject a supersonic gas jet has been demonstrated, by different authors, to be an effective option to increase performance and cut quality during fusion laser cutting of difficult materials. However, all efforts performed in this direction, have been accomplished using nozzles with axial symmetry. In this work, the fundamentals of a novel cutting head incorporating an off-axis nozzle, with non-axial internal symmetry are described. Gas flow inside the cut kerf is analyzed by means of flow visualization techniques. Moreover, cutting results are compared to those obtained through cutting heads assisted by axial-symmetric de Laval nozzles and sonic nozzles in a configuration off-axis and coaxial respectively with the laser beam.
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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) | 0.000 | 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 | 0.000 | 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 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".