: Requirements for the medium (e.g., water, oil, or grease) used to transmit sound between the probe and the tire surface. 3. Examination Procedures The report outlines two primary scanning methods:
Detailed requirements regarding frequencies (typically ranging from 1 MHz to 5 MHz for railway steel) and beam angles (straight-beam/normal probes for longitudinal waves and angle-beam probes for transverse waves).
The standard mandates specific requirements for ultrasonic testing units, including probes, frequencies, and calibration blocks. This ensures that test results are reproducible across different manufacturing facilities globally. 2. Scanning Sensitivity and Calibration
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Measuring the ability of ultrasound waves to pass through the material (specifically for axles) to ensure they can be accurately inspected for fatigue cracks during their future service life. Safety Compliance: iso 5948 pdf
Detects internal discontinuities (cracks, inclusions, voids).
Instead of providing general guidance, ISO 5948 lays out quantifiable criteria for and acceptance levels . This means it tells ultrasonic testers precisely how to perform the inspection and provides objective thresholds to determine if the material passes or fails.
Once you legally acquire the PDF, here is how to use it effectively:
The standard did not strictly dictate how to perform the test (methodology), but rather defined and the acceptance criteria for those indications. : Requirements for the medium (e
* ISO 5948:2018. * ISO 5948:2018. * Railway rolling stock material — Ultrasonic acceptance testing. * Edition 3. 2018-12. ISO - International Organization for Standardization ISO 5948:2018 Ultrasonic Testing Standards | PDF - Scribd
ISO 5948 is an international standard developed by the under the technical jurisdiction of committee ISO/TC 17/SC 15 (Railway rails, rail fasteners, wheels, and wheelsets). The standard establishes uniform testing guidelines using ultrasonic waves to identify internal material discontinuities like voids, cracks, inclusions, and structural inconsistencies during production or final delivery. The Evolution of the Standard
The ISO 5948 standard is a copyrighted document. To ensure you are working with the most accurate, up-to-date, and legally compliant version, it should be obtained through official channels:
Understanding the version history is critical for compliance, as using a withdrawn standard in a regulated environment could have legal and safety implications. The ISO 5948 standard has been revised a few times since its original publication: Scanning Sensitivity and Calibration This public link is
: Outlines the environment, timing of tests (e.g., after final heat treatment), and the surface condition of the components being inspected. Equipment Requirements
Tyres, solid wheels, wheel centers, and axles.
Comparing the defect reflection directly to the reference reflection from an artificial flaw.
Alignment with ISO 5948 ensures that railway components manufactured in one country meet the quality expectations of transit authorities worldwide.
ISO 5948 typically referenced general magnetic particle testing standards (such as ISO 9934 or ISO 3057) for the actual execution of the test. This included: