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magnetic particle testing
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GB NDT ENGINEERING SERVICESGB NDT ENGINEERING SERVICES LAB E-52, INDUSTRIAL ESTATE,LAB E-52, INDUSTRIAL ESTATE, THUVAKKUDY, TIRUCHIRAPPALLI-620015THUVAKKUDY, TIRUCHIRAPPALLI-620015
MAGNETIC PARTICLEMAGNETIC PARTICLE TESTINGTESTINGPREPAREDPREPARED
BYBY
G.PARAMJOTHI G.PARAMJOTHI BEBE(MECH),(MECH),MBA,MBA,NDT LEVEL IINDT LEVEL II
[ TECHNICAL OFFICER [ TECHNICAL OFFICER // NDT C NDT CO - ORDINATORO - ORDINATOR ] ]
T.C. KARTHIKEYAN T.C. KARTHIKEYAN DME, NDT LEVEL IIDME, NDT LEVEL II
[ TECHNICAL OFFICER][ TECHNICAL OFFICER]
INTRODUCTIONINTRODUCTION
Magnetic Particle Inspection is non-destructive
testing method for detecting the presence of
flaws, cracks, cold shuts, porosity, lack of fusion
and other common faults or discontinuities in
ferromagnetic metallic materials, such as iron and
magnetic alloys of steel. The technique is best
employed for detecting discontinuities that are
open to the surface, and subsurface in material.
PRINCIPLEPRINCIPLE
Flux Leakage at surface.
MAGNATIZATIONMAGNATIZATION Magnetization of certain metals is possible to
reveal the discontinuities by passing a medium of
iron powder having magnetic attraction.
THEORY OF MAGNETIZATIONTHEORY OF MAGNETIZATION
An object is magnetized. When part or all of its
magnetic domains have their north to south pole
attraction is known as Magnetization
PROPERTIES OF MATERIALPROPERTIES OF MATERIAL
• Permeability.
• Reluctance.
• Residual Magnetism.
• Retentivity.
TYPES OF MAGNETIZATIONTYPES OF MAGNETIZATION
• Circular Magnetization. – Prod Method (Dry)– Head Shot Method (Wet) – Central Conductor Method (Wet)
• Longitudinal Magnetization
-Yoke Method ( Dry/Wet )
-Coil Method ( Dry/Wet )
PROD METHODPROD METHOD
HEAD SHOT METHODHEAD SHOT METHOD
CENTRAL CONDUCTOR CENTRAL CONDUCTOR METHODMETHOD
YOKE METHODYOKE METHOD
COIL METHODCOIL METHOD
MT Indications