BS EN ISO 9934-3:2015 pdf free.Non-destructive testing-Magnetic particle testing Part 3: Equipment.
This part of Iso 9934 describes three types of equipment for magnetic particle testing:
— portable or transportable equipment;
— fixed installations;
— specialized testing systems for testing components on a continuous basis, comprising a series of processing stations placed in sequence to form a process line.
Equipment for magnetizing, demagnetizing, illumination, measurement, and monitoring are also described.
This part of ISO 9934 specifies the properties to be provided by the equipment supplier, minimum requirements for application and the method of measuring certain parameters. Where appropriate, measuring and calibration requirements and in-service checks are also specified.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3059, Non-destructive testing — Penetrant testing and magnetic particle testing — Viewing conditions
ISO 9934-1, Non-destructive testing — Magnetic particle testing — Part 1: General rules
EN 10250-2, Open steel die forgings for general engineering purposes — Non-alloy quality and special steels
IEC 60529, Degrees of protection provided by enclosures (JP Code)
3 Safety requirements
The equipment design shall take into account all international, European, national and local regulations which include health, safety, electrical and environmental requirements.
4 Types oldevices
4.1 Portable electromagnets (AC’))
4.1.1 General
Hand-held portable electromagnets (yokes) produce a magnetic field between the two poles. When testing according to ISO 9934-1, DC!) electromagnets should only be used if agreed at enquiry and order stages.
Magnetization shall be determined by measuring the tangential field strength, H, at the centre of a line joining the centres of the pole faces of the electromagnet with pole extenders where used. The electromagnet with a pole spacing. s, is placed on a steel plate as shown in Figure 1. The plate shall have the dimensions (500 ± 25) mm x (250 ± 13) mm x (10 ± O5) mm and shall be of steel conforming to C22 (1.0402) of EN 10250-2. Periodic functional checks can be carried out either by the method described above or by a lift test. The electromagnet shall be capable of supporting a steel plate or rectangularbarconformingto C22 (1.0402) of EN 10250-2 and havinga minimum massof4,5 kg,with the magnet poles set at their recommended spacing. The major dimension of the plate or bar shall be greater than the pole spacing, s, of the electromagnet.
4.1.2 Technical data
The following data shall be provided:
recommended pole spacing (maximum and minimum pole spacing) (smax, Smin);
cross sectional dimensions of the poles;
electrical supply (voltage, current, and frequency);
current wave forms available;
method of current control and effect on waveform (e.g. thyristor);
duty cycle at maximum output (ratio of current “ON” to “Total” time expressed as a percentage);
maximum current “ON” time;
tangential field strength Ht at Smax and Smin (following 4.1);
overall dimensions of the equipment.BS EN ISO 9934-3 pdf free download.