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FAQ - Frequently Asked Questions

Here you will find the most basic information about non-destructive tests and you will find out what you may be asked of when you will be ordering tests for your construction. If you have any additional questions, share them with us, we will surely answer.


  • What is the minimal thickness for ultrasonic examination of the welded joint?

    Depending on the standards applied. The minimal thickness is 8 mm. The rules of Classification Societies allow for an ultrasonic test to be performed on welds from 10 mm or even from 12 mm in case of BV Rules.

  • What is the maximal thickness that can be examined with the x-ray method?

    The maximum thickness for x-ray method is 50 mm.

  • When can you perform a non-destructive tests?

    The tests are done in different phases of prodution. The final tests are done after the final heat treatment and 24/48 hours after welding.

  • Does NAVITEST do work abroad?

    Yes, we travelled to all continents already.

  • Which examination method is the best?

    There is no "best" method. Each method is designed for finding a certain type of defects. Contact us and we will give you a more precise answer.

  • Can you perform magnetic particle inspection (MT, MPI) on painted elements?

     It is possible under condition that the overall thickness of the coating and white foundation paint used during examination does not exceed 50 µm. The thickness of the white foundation paint is usually about 15 - 30 µm.

  • What tests can be performed on a painted surface?

    X-ray examination can  always be run, ultrasonic examination with some limitations and visual inspection (with a mention in a protocol about existing coating).

  • How should a surface be prepared for surface tests: dye penetrant, magnetic particle and visual inspection?

    The tested surfaces should be free of scale, chips, grease, water, dirt and other agents that can affect the sensitivity of the examination. In case of paint, for magnetic particle inspection the allowed coating thickness cannot exceed 50 µm (including the contrast). For dye penetrant inspection no coating is allowed.

  • How do standards for non-destructive examinations describe defects / inconsistencies of the tested objects?

    Standards for ultrasonic, magnetic particle and dye penetrant tests use the term indication, not reffering to specific names such as cracks, lack of fusion, porosity, but instead describe indications as linear, non-linear, flat or volumetric depending on the testing method. In x-ray reports test result is defined by welding inconsistencies according to the standard PN EN ISO 6520-1.

  •  Why different types of non-destructive tests can give different results for the same test object?

    There is a possibility of different results. For example indications invisible or acceptable in the ultrasonic test, in x-ray tests turn out to be unacceptable or the other way round. Similarly for MT and PT surface examination.

  • If you have other questions feel free to ask.

    Send your question to: or call 58 520 75 00