ISO 5948:1994 pdf download.Railway rolling stock material — Ultrasonic acceptance testing.
This International Standard specifies the testing conditions and the acceptance standard for ultrasonic acceptance tests for the components and types of tests covered in table 1, columns 1 to 6.
Unless otherwise agreed, this International Standard shall be applied when the product standards require mandatory ultrasonic tests or when the ordered optional tests are made mandatory (see ISO 1005-1. ISO 1005-3 and ISO 1005-6).
NOTE 1 Following the revision of ISO 1005-6, ultrasonic acceptance tests are mandatory for all wheels of testing category B, but optional for all wheels of testing category A. According to ISO 1005-1 and ISO 1005-3, ultrasonic acceptance tests on tyres and axles are optional in every case.
6 Surface condition of the products
6.1 Unless otherwise agreed, independent of the surface condition in which the product is to be delivered, ultrasonic testing may be carried out either in the unmachined or machined condition, provided that the requirements of 6.2 to 6.4 are observed.
6.2 The surface condition of both the testing and reflecting surfaces of the products shall be such that there is no interference with the test.
6.3 When ultrasonic acceptance tests are carried out on products in the unmachined condition, any scale shall tightc adhere to the metallic surface andshall be sufficiently smooth to meet the conditions of 6.2.
6.4 When products to be ultrasonically tested are machined before testing, the operation shall ensure that a surface finish suitable for ultrasonic testing is achieved.
9 Setting of the sensitivity of the instrument
9.1 General
The setting of the sensitivity of the instrument shal be carried out under the same conditions (see 7.2 and clause 8)as the tests themselves.
In the case of discontinuity-detection tests, in each case the sensitivity shall be set so that, within the area to be scanned outside the” dead zone “(see note 2 to table 1)，a reference reflector with a diameter specified as acceptance standard in clause 12 can irrespective of its distance from the surface to be scanned, be detected positively.
NOTE 3 Calibration blocks applied for establishing the DGS diagrams or for setting the sensitivity according to 9.2, 9.3 or 9.4 shall have an acoustic attenuation similar to that of the wheels or tyres to be tested.ISO 5948:1994 pdf download.