TM9-2815-226-34-1 - JATONKAM35s HOME ON THE WEB

TM 9-2815-226-34-1p. Perform magnetic crack inspection of crankshaft.(1) Wet the complete surface with magnetic particle suspension before applying currents.(2) The following directional magnetizing currents are to be used for crankshaft magnetic inspection orMagnaflux inspection:Direction of DefectLongitudinalCircumferentialDC or Rectified AC 1200 Amp 3600-4000 amp turnsAC Equipment 1400 Amp 4200-4700 amp turnsMagnetizing Method Head Shot Coil ShotNOTEAmpere turns in amperage flowing through coil is multiplied by number of turns incoil; above is for 4 turn coil.(3) Flow magnetic particle suspension over the part before placing part through coil. Turn current on the coiland move the coil the full length of the part.(4) If shaft parts are within 2 or 3 in. of the coil inside diameter ample magnetism will be obtained if 3 shots ofcurrent are passed through coil while it is at each end and the center of part length.(5) The limits of acceptability, unless otherwise stated, apply only to light slag or oxide stringers usually definedas inherent inclusions, obvious cracks and circumferential or transverse defects.3-124