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1、NJBST Co.,Ltd.QCD-014Rev.:0Page:1 of 8Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATIONPROCEDURE FOR MAGNETIC PARTICLE EXAMINATION磁 粉 检 验 操 作 工 艺 规 程 CONTROLLED 在控本 UNCONTROLLED 非在控本 COPY NO 副本编号：PREPARED BY DATE 日期： REVIEWED BY DATE 日期： APPROVED BY DATE 日期：NJBST Co.,Ltd.QCD-014Rev.:0Page:2 of 8Tit
2、le: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATIONDEMONSTRATION CERTIFICATION This is to certify that this procedure has been demonstrated on a test specimen with known defects to the satisfaction of the Authorized Inspector according to T-150 of ASME Code Section V, as required by Appendix 6 of Sectio
3、n Div.1. Test Specimen No.: Demo. Report No.: NDE Level : AI: NJBST Co.,Ltd.QCD-014Rev.:0Page:3 of 8Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATION 1. General 1.1 This procedure is applied to the magnetic particle examination of ferromagnetic materials and welds for ASME Code items. 1.2 The magne
4、tic particle examination method is suitable for detecting cracks and other discontinuities on or near the surface in ferromagnetic materials. 1.3 This procedure is applied to wet continuous magnetization by yoke, which shall only be applied to detect discontinuities that are open to the surface of t
5、he part. 1.4 This procedure shall be demonstrated to the satisfaction of the AI prior to implementation. 2. Personnel 2.1 The NDE personnel who engage in magnetic particle examination shall be qualified and certified according to NJBST Co.,Ltd.s “Written Practice for NDE Personnel Training, Examinat
6、ion, Qualification & Certification(No.:QCD-011). 3. Description of Method 3.1 In principle, the magnetic particle examination method involves magnetizing an area to be examined, and applying ferromagnetic particles to the surface. The particles will form patterms on the surface where cracks or other
7、 discontinuties cause distortions in the normal magnetic field. These patterns are usually characteristic of the type of discontinuity that is detected. 3.2 The sensitivity of the magnetic particle examination is greatest for surface discontinuities and diminishes rapidly with increasing depth of di
8、scontinuities below the surface. Therefore, this method can only be used for detecting the discontinuities on or near the surface of the material or parts to be tested. 4. Magnetization Equipment and Calibration 4.1 The MT equipment to be used is Yoke, with Type CDX-4. 4.2 Calibration of Equipment 4
9、.2.1 Frequency of calibration: Each Magnetizing Equipment with an ammeter shall be calibrated at least once a year，or whenever the equipment has been subjected to a major electric repair, periodic overhaul or damage. If equipment has not been in use for a year or more, calibratioon shall be done pri
10、or to first use. 4.2.2 Calibration for lifting power of the Yoke The lifting power will be calibrated with the methods of lifting a standard weight cake. Each alternating-current electromagnetic yoke shall have a lifting power of at least 10lb(44N). at the maximum pole spacing. Each direct-current e
11、lectromagnetic yoke shall have a lifting power of at least 40lb(177N). at the maximum pole spacing. 5. Examination Medium 5.1 The examination medium shall be the finely divided 1. 概述 1.1 本规程适用 于ASME标准产品铁磁性材料和焊缝的磁粉检验。 1.2 磁粉检验方法适用于在铁磁性材料外表或其附近探测裂纹和其它不均匀性缺陷。 1.3 本规程适用于磁轭湿粉连续磁化法技术。此法仅适用于检出工件外表开口缺陷。 1.4
12、 本规程在执行之前须通过演示，使AI审查满意。 2. 人员 2.1 从事磁粉检验的NDE人员必须是根据南京宝色钛业(资料号：QCD-011)进行考试和资格任命的合格人员。 3. 方法综述 3.1 原那么上，磁粉检验方法是指在工件受检区域外表施加铁磁粉，裂纹或其它缺陷会导致正常磁场畸变，使外表上的磁粉形成一定图形，这些图形通常是探测到的缺陷特征。 3.2 磁粉检验法的灵敏度以外表缺陷处为最高，并随离外表深度的增加而迅速降低；因此，本方法仅适用于检验材料或部件的外表或近外表缺陷。 4. 磁化设备校验 4.1 MT设备采用CDX-4型磁轭式探伤仪。 4.2 设备校验 4.2.1 校验周期：每一带电流
13、表的磁化设备至少应每年校验一次；设备进行过重要电源修理，周期大修或损坏时，必须得到校验。如果设备已一年或一年以上未使用，那么在第一次使用之前必须校验。 4.2.2 磁轭提升力的校验 提升力用标准重块提升法来校验。交流电磁轭提升力至少为10lb(44N)(最大磁轭间距);直流电磁轭提升力至少为40lb(177N)( 最大磁轭间距)。 5. 检验介质NJBST Co.,Ltd.QCD-014Rev.:0Page:4 of 8Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATIONferromagnetic particles which have hig
14、h permeability and low retentivity. The size and shape of the magnetic particles shall be suitable for forming magnetic particle indications. 5.2 The black magnetic particles HK-1-400or 350, made by yixin Citong Co Ltd., shall be used. 5.3 The fluid medium for the magnetic suspension fluid shall be transformer oil, smelless kerosene or water. The temperature of the wet particle suspension and the surface of the part shall not exceed 1350F(570C). 5.4 Concentration of wet magnetic particle suspensions 5.4.1 The initial bath concentratio
