BS EN 16090:2019 pdf free.Copper and copper alloys – Estimation of average grain size by ultrasound.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 5577 and the following apply.
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3.1 grain area in a metal within the boundary of a crystal
Note 1 to entry: For the purpose of applying the method described in this document, a crystal and its twin bands are considered as one grain. Sub-grains, minor constituent phases, inclusions and additives are not considered in the estimation of the grain size.
4 General requirements 4.1 Personnel qualification
The ultrasonic test shall be conducted by operators trained in this technique and it shall be done under the responsibility of qualified staff. The qualified staff shall be competent. When agreed upon between the purchaser and the supplier, qualification of the personnel shall be certified according to
EN ISO 9712.
The qualified staffs is especially responsible for the: — issue and release of test procedures for operators; — training of operators in ultrasonic testing; — compilation and release of correlation of ultrasonic signals and grain size (calibration curve).
4.2 Condition of products to be tested
Products shall be suffIciently clean to permit satisfactory test operation and adequate coupling. Products shall be free of deep cracks and grooves generating ultrasonic signals.
This method is only applicable for products in the material condition: — annealed; — light-annealed; — light-drawn; — soft annealed.
4.3 Test equipment
Ultrasonic equipment with pulse echo technique shall be used as described in EN ISO 16810:2014, 5.4. It is recommended to use test equipment according to EN 12668-1 and EN 12668-2.
Ultrasonic testing and result analysis typically is done in an automated system against pre-determined criteria without human intervention (see Figure 1).
When driving mechanics are used for the sample they shall be as vibration-free as possible. In general, if samples will be moved during the test (in axial direction or by rotation), it is required to keep the distance between sample and probe constant. Probes within the frequency range of 1 MHz to 60 MHz shall be applied.BS EN 16090 pdf download.