T9074-AS-GIB-010/271 Rev 1
4.3.1.4 Surface Preparation.....................................................................................................................................4-2 4.3.1.4.1 Cleaning and Masking...........................................................................................................................4-2 4.3.1.4.2 Cleaning Solution..................................................................................................................................4-2 4.3.1.5 Direction of Magnetization. ........................................................................................................................4-2 4.3.1.6 Demagnetizing Apparatus..............................................................................................................................4-3 4.3.1.6.1 Demagnetization. ..................................................................................................................................4-3 4.3.1.7 Equipment Accuracy. ..................................................................................................................................4-3 4.3.1.7.1 DC Portable Prod and Stationary Magnetic Particle Equipment...........................................................4-3 4.3.1.7.2 Yoke Equipment. ..................................................................................................................................4-3 4.3.1.8 Magnetizing Current. ..................................................................................................................................4-3 4.3.1.9 Record Requirements. .................................................................................................................................4-3 4.3.2 Wet Method. .....................................................................................................................................................4-3 4.3.2.1 General Requirements.................................................................................................................................4-3 4.3.2.1.1 Equipment. ............................................................................................................................................4-3 4.3.2.2 Vehicles. .....................................................................................................................................................4-4 4.3.2.2.1 Cleaning and Drying. ............................................................................................................................4-4 4.3.2.3 Magnetic Particles.......................................................................................................................................4-4 4.3.2.4 Suspensions.................................................................................................................................................4-4 4.3.2.5 Procedure. ...................................................................................................................................................4-4 4.3.2.5.1 Continuous Method. ..............................................................................................................................4-4 4.3.2.5.2 Residual Method. ..................................................................................................................................4-4 4.3.2.5.3 Circular Magnetization; Central Conductor (Indirect Method). ............................................................4-4 4.3.2.5.4 Circular Magnetization; Item as Conductor (Direct Method). ..............................................................4-4 4.3.2.5.5 Circular Magnetization; Magnetizing Current. .....................................................................................4-5 4.3.2.5.6 Longitudinal Magnetization. .................................................................................................................4-5 4.3.2.5.7 Longitudinal Magnetizing Current. .......................................................................................................4-5 4.3.2.6 Maintenance of suspension. ........................................................................................................................4-5 4.3.2.6.1 Concentration of Suspension Test. ........................................................................................................4-5 4.3.3 Dry Powder Method. ........................................................................................................................................4-6 4.3.3.1 General Requirements for Magnetic Particles.............................................................................................4-6 4.3.3.2 Application and Removal of Particles.........................................................................................................4-6 4.3.3.2.1 Removal of Excess Particles. ................................................................................................................4-6 4.3.3.2.2 Automated Equipment. .........................................................................................................................4-6 4.3.3.3 Magnetizing Procedures..............................................................................................................................4-6 4.3.3.3.1 Circular Magnetization. ........................................................................................................................4-6 4.3.3.3.2 Longitudinal Magnetization. .................................................................................................................4-6 4.3.3.3.3 Yoke Magnetization. .............................................................................................................................4-6 4.3.3.3.4 Magnetizing Current (Prod Methods). ..................................................................................................4-6 4.3.3.4 Magnetizing Technique (Yoke and Prod). ..................................................................................................4-6 4.3.3.4.1 Weld Inspection. ...................................................................................................................................4-6 4.3.3.4.2 Base Metal. ...........................................................................................................................................4-6 4.3.3.4.3 Continuous Magnetization. ...................................................................................................................4-6 4.4 EVALUATION OF INDICATIONS. .........................................................................................................................4-7 4.5 DETERMINATION OF RELEVANCY. ...................................................................................................................4-7 4.6 FINAL CLEANING. ..................................................................................................................................................4-7 4.7 ARC STRIKES. ..........................................................................................................................................................4-7 4.7.1 Arc Strikes in High Hardenability Materials.....................................................................................................4-7 CHAPTER 5 LIQUID PENETRANT TESTING ...................................................................................................................5-1 5.1 INTENDED USE........................................................................................................................................................5-1 5.2 DEFINITIONS. ..........................................................................................................................................................5-1 5.3 INSPECTION METHODS.........................................................................................................................................5-1 5.3.1 Liquid Penetrant Material. ................................................................................................................................5-1
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