ISO 5948:1994 pdf download.Railway rolling stock material一Ultrasonic acceptance testing
1 Scope
This International Standard specifies the testing con-ditions and the acceptance standard for ultrasonic ac-ceptance 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 ac-ceptance tests on tyres and axles are optional in every case.
2 Normative references
The following standards contain provisions which,through reference in this text, constitute provisions of this International Standard. At the time of publi-cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re-cent editions of the standards indicated below.Members of IEC and ISO maintain registers of cur-rently valid International Standards.
ISO 1005-1:1994，Railway rolling stock material 一 Part 1: Rough-rolled tyres for tractive and trailing stock一Technical delivery conditions.
ISO 1005 3:1982，Railway rolling stock material 一 Part 3: Axles for tractive and trailing stock 一 Quality requirements.
ISO 1005-6:1994，Railway rolling stock material 一 Part 6: Solid wheels for tractive and trailing stock 一 Technical delivery conditions.
9.1 General
The setting of the sensitivity of the instrument shall 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 shell have an acoustic attenuation similar to that of the wheels or tyres to be tested.
9.2 Sensitivity setting for wheels or tyres
9.2.1 For wheels or tyres to be tested with the beam in an axial or radial direction and to be evaluated by the distance-gain-size (DGS) method, the sensitivity is set with the help of the DGS diagram and the backwall echo occurring when axially testing the tyre or the wheel rim.
9.2.2 For wheels and tyres to be evaluated by the comparison method, the sensitivity shall be set:
a) when being tested with the beam in an axial direction, with the help of a calibration block of the type shown in figure 1 and an internal reference standard of the type shown in figure 2 (see note 4) (both may be combined in the same block); or
b) when being tested with the beam in a radial direction, with the help of a calibration block of the type shown in figure 3.
NOTE 4 In this International Standard, “internal reference standard” means a calibration block with a bore on the backwall with the position, form, depth and diameter indicated in figure 2.ISO 5948 pdf download.