Nerazorne metode ispitivanja materijala su metode kojima ispitujemo stanje ispitnog materijala bez invanzivnog djelovanja na isti, koje se mogu nalaziti na površini ispitnog elementa ili unutar materijal od kojeg je ispitni element izrađen. Oblik, dimenzije, karakteristike, te kemijska i fizikalna svojstva ispitnog elementa prilikom ispitivanja se ne mijenjaju. Opisani su fizikalni principi, oprema i pribor koji se koriste prilikom ispitivanja. Uz navedeno prikazan je i redoslijed koraka koje je potrebno odraditi prilikom ispitivanja. Obrađene su metoda ispitivanja tekućim penetrantima (PT), ispitivanje magnetskim česticama (MT) i ispitivanje ultrazvukom (UT). Sve tri metode koristile su se prilikom ispitivanja strojnog dijela MK.17-DI.50, tj. kranske dizalice na brodu M/V „Platres“, gdje je ispitivanje tekućim penetrantima provedeno na zavarenom spoju prirubnice temelja kranske dizalice i pogonskog zupčanika dizalice. Magnetskim česticama ispitivalo se hvatište kranske dizalice, dok je ispitivanje ultrazvukom provedeno na zavarenom spoju prirubnice temelja kranske dizalice.

Non-destructive methods of testing materials are methods to examine the state of the test material without any invasive action on the same, which may be on the surface of the test element or within the material from which the test element is made. The shape, dimensions, characteristics, and chemical and physical properties of the test element during the test are not altered. Physical principles, equipment and accessories used for testing are described. In addition, the sequence of steps to be taken during the test is shown. The method of testing liquid penetrants (PT), magnetic resonance imaging (MT) and ultrasonic testing (UT) were performed. All three methods were used when testing the machine part MK.17-DI.50, ie a crane on the M / V "Platres" ship, where the penetration test was carried out on the welded joint of the crankshaft base and the crankshaft gear. Crank of the crane was tested with magnetic particles, while the ultrasound test was carried out on the welded joint of the crankshaft base flange.