英语翻译This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability
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This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Examination Coverage—All examinations should be conducted with sufficient area overlap to assure the required coverage at the specified sensitivity has been obtained.
Direct and Indirect Magnetization—A part can be magnetized either directly or indirectly.For direct magnetization the magnetizing current is passed directly through the part creating a circular magnetic field in the part.With indirect magnetization techniques a magnetic field is induced in the part which can create a circular/toroidal,longitudinal,or multidirectional magnetic field in the part.The techniques described in 20.8 for verifying that the magnetic fields have the anticipated direction and strength should be employed.This is especially important when using the multidirection technique to examine complex shapes.
Direct Contact Magnetization—For direct magnetization,physical contact must be made between the ferromagnetic part and the current carrying electrodes connected to the power source.Both localized area magnetization and overall part magnetization are direct contact means of part magnetization achieved through the use of prods,head and tailstock,clamps,and magnetic leeches.