WTE Power Testing NDT MT Magnetic particle test

NDT MT Magnetic particle test

Key Standards for Magnetic Particle Testing (MT) of Steel

Standard	Title	Application
ISO 9934-1	Non-destructive testing — Magnetic particle testing — Part 1: General principles	Core international standard for MT procedures
ISO 9934-2	Detection media	Specifies requirements for magnetic particles (dry/wet, fluorescent/visible)
ISO 9934-3	Equipment	Requirements for MT equipment (magnetizing units, UV lamps, etc.)

Standard	Title	Notes
ASTM E709	Standard Guide for Magnetic Particle Testing	General MT practice guide widely used in the U.S.
ASTM E1444 / E1444M	Standard Practice for Magnetic Particle Testing	Most referenced standard for qualified MT testing (covers technique, particles, acceptance)
ASME Section V, Article 7	Magnetic Particle Examination	Required for MT in pressure vessel, nuclear, and piping applications

Magnetization methods:
- Yoke (AC or DC)
- Prods (DC for deeper penetration)
- Coil or central conductor (for ring parts)
Particle type:
- Wet visible (usually black on white background)
- Wet fluorescent (green/yellow particles under UV)
- Dry powder (mainly visible particles)
Surface prep: Clean, dry, and accessible; surface roughness and coatings influence test sensitivity
Field direction: Multiple orientations may be required to detect discontinuities in all directions