MT - LEVEL 1 MAGNETIC PARTICLE INSPECTION

PUBLIC CONCERNED

All Non Destructive Testing agents involved with a certification level 1. During the examination of level 1 MPI testing certification , the questionnaires relating to the specific part relate more particularly to procedures used in the Aerospace industry.

OPERATING PROCEDURES

- Equipments apt to the various techniques of magnetization

Direct current or indirect
Coils
Solenoids
Etc…

- Methods of magnetization

Continuous method
Residual method

- Selection of the magnetization method according to the parts geometry to be inspected

TYPE OF DEFECTS

These are specific to each manufacturing phase and use

- Nature, form, position, orientation, density, etc...

PRODUCTS/PARTS

- Melting method, transformation, machining and steels assembly

HEAT AND THERMOCHEMICAL TREATMENTS

- Hardening
- Tempering
- Stress relief
- De-Embrittlement
- Effect of temperature on magnetism

PARTS MACHINING

- Conventional means (milling, turning, grinding, etc…)
- Electro Discharge Machining
- Electrolytic machining
- Deformation techniques (bending, milling, riveting, etc…)

CALIBRATION

- Masters
- Checking means of equipments

MAGNETIZATION INTENSITY

- Magnetic field values recommended
- Magnetic field value check
- Relations between values read on ammeters and peak value

DEMAGNETIZATION

- Purpose
- Principles
- Operating procedures

MAGNETIC LIQUOR

- Nature
- Characteristics
- Checking means

NON-RELEVANT INDICATIONS

- Case of parts geometry
- Welded joints
- Machining
- Material permeability,

UV RADIATION

- Characteristics
- Conditions of use

QUALITY

- Equipments approval
- Periodic Follow-up
- Check Instructions
- Specifications
- Health and safety

TANGENTIAL FIELD

- Measurement means
- Relations between values read on the Hall effect Gauss meter and the real values

EXAMINATION CONDITIONS

- Parts handling
- Environment of the examination area
- Measurement means
- Visual Means
- Defects interpretation
- Sanction

PARTS PREPARATION BEFORE AND AFTER APPLICATION OF THE PROCESS

- Degreasing (solvents, alkaline soaps, acid solutions) and mechanical preparations (sand blasting, shot peening, etc…) on :

Machined parts
Parts in service
Blanks

MT -LEVEL 2 MAGNETIC PARTICLE INSPECTION

PUBLIC CONCERNED

All Non Destructive Testing agents involved with a certification level 2. During the examination of level 2 MPI testing certification, the questionnaires relating to the specific part relate more particularly to procedures used in the Aerospace industry.

OPERATING PROCEDURES

- Equipments apt to the various techniques of magnetization

Direct current or indirect
Coils
Solenoids
Etc…

- Methods of magnetization

Continuous method
Residual method

- Selection of the magnetization method according to the parts geometry to be inspected

TYPES OF DEFECTS

These are specific to each manufacturing phase and use

Nature, form, position, orientation, density, etc...

INCOMING INSPECTION

- Forging parts
- Casting parts
- Bars
- Etc...

PRODUCTS/PARTS

- Melting method, transformation, machining and steels assembly

HEAT AND THERMOCHEMICAL TREATMENTS

- Hardening
- Tempering
- Stress relief
- De-Embrittlement
- Effect of temperature on magnetism

PARTS MACHINING

- Conventional means (milling, turning, grinding, etc…)
- Electro Discharge Machining
- Electrolytic machining
- Deformation techniques (bending, milling, riveting, etc…)

CALIBRATION

- Masters
- Checking means of equipments

MAGNETIZATION INTENSITY

- Magnetic field values recommended
- Magnetic field value check
- Relations between values read on ammeters and peak value

DEMAGNETIZATION

- Purpose
- Principles
- Operating procedures

MAGNETIC LIQUOR

- Nature
- Characteristics
- Checking means

NON-RELEVANT INDICATIONS

- Case of parts geometry
- Welded joints
- Machining
- Material permeability

UV RADIATION

- Characteristics
- Conditions of use

QUALITY

- Equipments approval
- Periodic Follow-up
- Check Instructions
- Specifications
- Health and safety

TANGENTIAL FIELD

- Measurement means
- Relations between values read on the Hall effect Gauss meter and the real values

EXAMINATION CONDITIONS

- Parts handling
- Environment of the examination area
- Measurement means
- Visual Means
- Defects interpretation
- Sanction

PARTS PREPARATION  BEFORE AND AFTER APPLICATION OF THE PROCESS

- Degreasing (solvents, alkaline soaps, acid solutions) and mechanical preparations (sand blasting, shot peening, etc…) on:

Machined parts
Parts in service
Blanks

PROCESS SHEETS

- General knowledge of process sheets and cost consideration

Melting process sheet
Machining process sheet
Inspection process sheet
Assembly process sheet
Overhaul process sheet

MT - LEVEL 3 MAGNETIC PARTICLE INSPECTION

PUBLIC CONCERNED

All Non Destructive Testing agents involved with a certification level 3. During the examination of level 3 MPI testing certification , the questionnaires relating to the specific part relate more particularly to procedures used in the Aerospace industry.

MPI OPERATORS

- Visual and medical aptitude,
- Behavior of an inspector to certain situations.

EQUIPMENTS

Equipments apt to the various techniques of magnetization

Direct current or indirect
Coils
Solenoids
Etc…

UV Lamps

- Energy radiation of UV lamps,
- Health and safety aspects.

Magnetic liquor

- Control of magnetic liquor,
- Characteristics of the fluorescent magnetic particles.

Hall Effect Gauss meter

- General Knowledge on the Hall Effect Gauss meter and Hall effect

These are associated equipments (check and monitoring of equipments).

- Radiometer, luxmeter, masters, etc...

OPERATING PROCEDURES

Parts preparation

- Various methods of parts preparation before MPI inspection

Chemical, mechanical, electrolytic techniques, solvents, etc...

Magnetization

- Types of magnetization recommended according to the orientation and type of defects to be detected:

Circular magnetization,
Longitudinal magnetization,
Toroïdal magnetization.

- Magnetization intensity values:

Parts of simple and complex geometry,
Cylindrical parts,
Hollow cylindrical parts (using a conductor).

- The type of current used (advantages and disadvantages):

Alternating Current (AC),
Half Wave Rectified Alternating Current (HWDC),
Full Wave Rectified Alternating Current (FWDC),

- Defects detected according to the current used:

Surface defects,
Subsurface defects.

- Relation between the peak values and the values read on the ammeters:

Alternating Current (AC),
Half Wave Rectified Alternating Current (HWDC),
Full Wave Rectified Alternating Current (FWDC),

Demagnetization

- Various principles of the demagnetization,
- The demagnetization according to the various methods,
- Demagnetization check

Parts with surface coatings

- Types of magnetization according to the coatings,
- The detection of the defects,
- Feasibility of a MPI inspection on parts with surface coatings:

phosphatizing,
chromium plating,
copper plating,
cadmium-plating.

DEFECTS INDICATIONS

Specific parts

- Types of defects detected in MPI on specific Aerospace parts (high-strength parts, parts with surface coatings):

fatigue cracks,

inclusions,

grinding cracks,

carbide segregations.

- Interpretation and differentiation of the defects.

- Interpretation of the part grain flow

Non-relevant indications

- Non-relevant indications that can be detected during a MPI inspection,

- Interpretation of the non-relevant indications.

CHECKS

- All checks necessary to the MPI inspection :

magnetic liquor,

ammeters,

masters,

UV lamps,

etc…

Note : Independently of the topics previously approached, it is recommended that the candidate has the necessary knowledge in health, safety, environment requirements and Aerospace standards in effect that are linked to the process, as well as in production costs.