Authors:

Stuart Kleven

,

Michael Kowatch

Publication:

Materials Evaluation, Volume 77, Issue 11

Publication Date: 1 November 2019Testing Method:

Magnetic Particle Testing

In the area of magnetic particle inspection, little has changed in the past 30 years. Improvements have been made in the use of solid-state electronics for the control circuit, compared to the old contactors. Some PC controls have been added to magnetic particle machines to allow for recall of magnetic particle techniques for specific parts for repetitive work so that the same parameters are always used. A few years ago, a revision to the ketos ring was made, and the AS-5282 (SAE 2015b) ring was developed to replace the previously used ketos ring. Verification of magnetic particle techniques was initiated with the use of gauss meters and QQIs (quantitative quality indicators), which have very shallow indications and are attached to the part under test. The vehicle, or carrier, has remained the same from the very beginning of the development of the test method. Deodorized kerosene has been the main material used since the inception of the magnetic particle method. Eventually, the use of water with an anti-rust and algaecide additive was also introduced. Recently, however, there has been a change in the world of magnetic particle testing. A carrier recycling unit is now available to clean the carrier and allow it to be reused.

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