ISO 9934-1-2016 pdf free.Non-destructive testing一Magnetic particle testing Part 1: General principles.
9.1 Properties and selection of media
The characterization of detection media shall he in accordance with ISO 9934-2.
Various types of detection media exist in magnetic particle testing. Usually the detection media is a suspension of coloured (including black) or fluorescent magnetic particles in a carrier fluid. Water- based carriers shall contain wetting agents and usually a corrosion inhibitor.
Dry powders are also available. They are generally less able to reveal fine surface discontinuities. Fluorescent detection media usually gives the highest sensitivity provided there is an appropriate surface finish. good drainage to maximize indication contrast, and well controlled viewing conditions, in accordance with Clause 10.
Coloured detection media can also offer high sensitivity if the contrast with the part surface is sufficient. Black and other colours are available.
NOTE To achieve good colour contrast between discontinuities and the test surface, it might be necessary to apply a thin layer of contrast aid paint in accordance with (‘lauj and 10.
9.2 Testing of detection media
ISO 9934-2 defines mandatory and recommended tests that are to be carried out before or periodically during inspection.
A sensitivity check shall be carried out before and periodically during testing, in accordance with ISO 9934-2 using a suitable reference piece.
If a magnetic ink is re-used or re-circulated, particular care shall be taken to maintain its performance.
9.3 Application of detection media
For the continuous technique, the detecting media shall he applied immediately prior to and during the magnetization. The application shall cease before magnetization is terminated. Sufticient time shall he allowed for indications to develop before moving or examining the component or siructure under test.
Dry powder. when used, shall be applied in a manner that minimizes disturbance of the indications. During application of a magnetic ink, it shall be allowed to flow onto the surface with very little pressure so that the magnetic particles are allowed to form an indication without being washed off.
After applying a suspension, the component shall be allowed to drain so as to improve the contrast of any indications.
10 Viewing conditions
The viewing conditions shall meet the requirements of ISO 3059.
There shall be good contrast between the detection media and the test surface. Where viewing is obstructed, the component or equipment shall be moved to permit adequate viewing of all areas. Care shall be taken to ensure that indications are not disturbed after magnetization has stopped and before the component has been inspected and indications recorded.
11 Overall performance test
Before testing begins, an overall performance test shall be carried out to reveal discrepancies in either the procedure or the magnetization technique or the detection media.ISO 9934-1 pdf download.
Tags: Non-destructive testing
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