| 摘要 |
Preliminary weld seam integrity testing in tube production. In a preferred embodiment, an "ovaling pass" station helps subject a tube to weld seam integrity testing that can ferret out weld seam problems much more reliably than with conventional technology, and at a comfortably early juncture. Particularly, after a tube has been formed and welded, an "ovaling pass" station will preferably be employed to cause the tube to become slightly oval in cross-sectional configuration to thus create a concentrated stress along the actual tube weld line. A sizing pass is then preferably employed to impart once again the desired, substantially constant circular cross-section with substantially constant diameter, after which conventional testing (such as eddy current testing) may take place.
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