Magnetic Testing (MT)


Magnetic Testing (MT) / Magnetic Particle Inspection (MPI) digunakan untuk mendeteksi cacat / diskontinuitas las-lasan yang berada di permukaan (suface) dan di bawah permukaan (sub-surface) dengan kedalaman plus minus 2 mm. Cara kerjanya dengan menggunakan alat yang disebut Yoke yang didalamnya berisi kumparan / coil yang apabila dialiri arus listrik akan menghasilkan medan magnet yang fungsinya nanti menarik keluar magnetic flux pada benda uji. Dimana flux line yang berada pada cacat benda uji akan berpendar (stray) dan menjadi magnetic attractive poles North dan South. Sehingga menimbulkan medan magnet dan keberadaan cacat pun bisa terbaca dari sini.

Kelebihan metode MT / MPI ini diantaranya adalah flexible dan mudah pengoperasian dilapangannya. Hanya saja membutuhkan ketersedian power listrik sebagai power supply untuk bisa melakukan pekerjaan MT / MPI. Dan metode MT / MPI ini digunakan terbatas hanya untuk mendeteksi cacat yang terbuka yang berada di permukaan (surface) dan sub-surfacenya saja.

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