Header
About this publication
PREFACE
1 SCOPE AND GENERAL
1.1 SCOPE
1.2 REFERENCED DOCUMENTS
1.3 DEFINITIONS
1.4 PRINCIPLE OF TEST METHOD
1.5 WRITTEN PROCEDURE REQUIREMENTS
1.6 SAFETY
1.6.1 General
1.6.2 Fire hazards
1.6.3 Electrical safety
1.6.4 Toxic materials
1.6.5 The use of black lights
1.7 TESTING PERSONNEL
2 EQUIPMENT AND MATERIALS
2.1 GENERAL
2.2 REQUIREMENTS FOR MAGNETIZING, DEMAGNETIZING AND AUXILIARY EQUIPMENT
2.2.1 Bench-type magnetizing equipment (incorporating a reservoir containing magnetic ink)
2.2.2 Permanent magnets and d.c. electromagnets
2.2.3 a.c. electromagnets
2.2.4 Auxiliary equipment
2.2.4.1 Light sources for viewing
2.2.4.2 Standard test pieces
2.2.4.3 Magnetic field strength meters and field indicators
2.3 REQUIREMENTS FOR MAGNETIC POWDERS AND INKS
2.3.1 Composition
2.3.2 Concentration of inks
2.3.3 Labelling
3 METHODS OF TEST
3.1 SCOPE
3.2 PREPARATION OF TEST SURFACE
3.3 MAGNETIZATION
3.3.1 General
3.3.2 Magnetic field directions
3.3.3 Peak current
3.3.4 Application of indicating media
3.4 MAGNETIZING METHODS
3.4.1 General
3.4.2 Magnetic flow methods
3.4.2.1 Application
3.4.2.2 Procedure
3.4.3 Current flow through work piece using contact heads method
3.4.3.1 Application
3.4.3.2 Procedure
3.4.4 Current flow through work piece using prods or clamps method
3.4.4.1 Application
3.4.4.2 Procedure
3.4.5 Coil methods
3.4.5.1 Application
3.4.5.2 Determination of number of coil turns and current
3.4.5.3 Calculating the L/D ratio for a hollow or a cylindrical part
3.4.5.4 Procedure
3.4.6 Threading conductor methods
3.4.6.1 Application
3.4.6.2 Procedure
3.4.7 Induced current flow method
3.4.7.1 Application
3.4.7.2 Principle
3.5 INSPECTION
3.5.1 General
3.5.2 Non-fluorescent dry powders and magnetic inks
3.5.3 Fluorescent magnetic inks
3.6 MARKING THE LOCATION OF DISCONTINUITIES
3.7 DEMAGNETIZATION
3.7.1 General
3.7.2 Demagnetization procedures
3.8 POST-TEST CLEANING
4 PROCESS CONTROL PROCEDURES AND REQUIREMENTS
4.1 GENERAL
4.2 CONTROL PROCEDURES
4.2.1 Magnetic inks
4.2.1.1 General
4.2.1.2 Determination of particle concentration
4.2.1.3 Assessment of magnetic ink condition
4.2.1.4 Water break test
4.2.2 Equipment verification
4.2.2.1 General
4.2.2.2 Ammeter accuracy
4.2.2.3 Field indicator accuracy
4.2.2.4 Dead weight check
4.2.2.5 Inspection of lighting intensity
4.2.2.6 System performance test
4.2.3 Frequency of checks
4.3 PROCESS CONTROL RECORDS
5 TEST RECORDS AND REPORTS
5.1 TEST RECORD
5.2 TEST REPORT
APPENDIX A
A1 GENERAL
A2 INFORMATION TO BE SUPPLIED BY THE PURCHASER
APPENDIX B
B1 SCOPE
B2 FOR THE CURRENT FLOW METHOD
B2.1 Preparation of test piece
B2.2 Procedure for use of standard test piece
B3 FOR MAGNETIC FLOW AND COIL METHODS
B3.1 Preparation of test piece
B3.2 Procedure for the use of test piece
B4 OTHER TEST PIECES
APPENDIX C
APPENDIX D
D1 GENERAL
D2 FACTORS AFFECTING THE VALUE OF LEAKAGE FLUX AND THE SIZE AND DETECTABILITY OF AN INDICATION
D2.1 Factors affecting the leakage flux produced at the surface
D2.2 Factors affecting the size of an indication
D2.3 Factors affecting the detectability of an indication
D3 METHODS FOR ENSURING THAT THE FLUX DENSITY IS IN THE RANGE REQUIRED FOR THE DETECTION OF DISCONTINUITIES
D3.1 The use of parts with known discontinuities
D3.2 The use of parts with artificial discontinuities
D3.3 The use of decreasing levels of magnetization
D4 EQUIPMENT FOR THE MEASUREMENT OF FLUX DENSITY
D4.1 Hall effect instruments
D4.2 Field indicators
D4.3 Eddy current instruments
D5 THE DETERMINATION OF MAGNETIZING CURRENT
APPENDIX E
APPENDIX F
