Characterization of Electron Beam Welded 17-4 PH Stainless Steel
Why this work is in the frame
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Bibliographic record
Abstract
The Canadian Department of National Defence (DND) currently has a requirement for a fully automated captive trajectory system (CTS) with six degrees of freedom, all of which are to be motorized, to study the movement of stores (such as missiles) during carriage/release testing of F-18 and other military aircraft in the National Research Council (NRC) trisonic blowdown wind tunnel. In the CTS, one of the joints providing linear motion is designed and fabricated with a linkage (telescoping inner strut (TIS)) in two halves, split along its neutral plane, to allow machining of the internal geometry. To support the dynamic, kinematic and aerodynamic loads induced, the two halves must be welded together while maintaining high tolerances on the inner geometry. The designed weld areas on the neutral plane require a penetration of 17.1 mm from each face in 17-4 precipitation hardening (PH) martensitic stainless steel (SS). Using conventional joining techniques, such as tungsten inert gas (TIG) welding, the fabrication of a thick section requires a V groove joint design and multiple passes to achieve the required penetration. However, exposure to a substantial heat input through this process renders large weld and heat affected zones on either face of the strut as well as distortion of the component, which poses considerable difficulties for assembly and motion. The application of a high energy density technique, namely electron beam (EB) welding, was utilized to penetrate the thick section with a single pass, while minimizing the weld region, heat affected zone (HAZ) and distortion of the strut (low heat input).
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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 | 0.000 |
| 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 it