AS ISO 9934.3 pdf download – Non-destructive testing — Magnetic particle testing Part 3: Equipment
This part of lSo 9934 describes three types of equipment for magnetic particle testing:-portable or transportable equipment;
specialized testing systems for testing components on a continuous basis, comprising a series ofprocessing stations placed in sequence to form a process line.
Equipment for magnetizing,demagnetizing,illumination，measurement,and monitoring arealso described.
This part of IS0 9934 specifies the properties to be provided by the equipment supplier，minimumrequirements for application and the method of measuring certain parameters. Where appropriate,measuring and calibration requirements and in-service checks are also specified.
The following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application.For dated references,only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any amendments) applies.
ISo 3059,Non-destructive testing — Penetrant testing and magnetic particle testing —Viewing conditionsISo 9934-1,Non-destructive testing —Magnetic particle testing — Part 1: General rules
EN10250-2,0pen steel die forgings for general engineering purposes —Non-alloy quality and special steelsIEC 60529, Degrees of protection provided by enclosures (IP Code)
The equipment design shall take into account all international,European, national and local regulationswhich include health, safety, electrical and environmental requirements.
4 Types of devices
4.1 Portable electromagnets (AC1)4.1.1 General
Hand-held portable electromagnets (yokes) produce a magnetic field between the two poles. Whentesting according to ISo 9934-1, Dci) electromagnets should only be used if agreed at enquiry andorder stages.
Magnetization shall be determined by measuring the tangential field strength, Ht, at the centre of aline joining the centres of the pole faces of the electromagnet with pole extenders where used.Theelectromagnet 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 × (250 ± 13) mm × (10 ± 0,5) 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 rectangular bar conforming to C22 (1.0402) of EN 10250-2 and having a minimum mass of 4,5 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. NOTE To lift a steel plate with a mass of 4,5 kg requires a lifting force of 44 N.
4.1.2 Technical data
The following data shall be provided:
— recommended pole spacing (maximum and minimum pole spacing) (s max , s min );
— 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 H t at s max and s min (following 4.1);
— overall dimensions of the equipment;
— equipment mass, in kilograms;
— specified electrical protection degree (IP) according to IEC 60529.
4.1.3 Technical requirements
The following requirements shall be satisfied at an ambient temperature of 30 °C and at maximum output:
— duty cycle ≥10 %
— current “ON” time ≥5 s
— surface temperature of handle ≤40 °C
— tangential field strength at s max (see 4.1) ≥2 kA/m (RMS)
— lifting force ≥44 N
4.1.4 Additional requirements
The electromagnet shall be supplied with a power ON/OFF switch, preferably mounted on the handle.
Generally electromagnets should be usable with one hand.