焊缝检验规程无损检测工艺规程磁粉检验模板.doc
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1、* Co.,Ltd.焊缝检验规程3Rev.:0Page:1 of 7Title: 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 编制: DATE 日期: REVIEWED BY 审核: DATE 日期: APPROVED BY 同意: DATE 日期:* Co.,Ltd.焊缝检验规程3Rev.:0Page:2 of
2、7Title: 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 Se
3、ction Div.1. Test Specimen No.: Demo. Report No.: NDE Level : AI: * Co.,Ltd.焊缝检验规程3Rev.:0Page:3 of 7Title: 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 * Co.,Ltd.s “Written Practice for NDE Personnel Training, Examination,
6、 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 di
7、scontinuties 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 disco
8、ntinuities 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 4.2.
9、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 prior
10、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 elec
11、tromagnetic 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规范产品铁磁性材料和焊缝磁粉检验。 1.2 磁粉检验方法适适用于在铁磁性材料表面或其周围探测裂纹和其它不均匀性缺点。 1.3 本规程适适用于磁轭湿粉连续磁化法技术。此法仅适适用于检出工件表面开口缺点。 1.4
12、本规程在实施之前须经过演示,使AI审查满意。 2. 人员 2.1 从事磁粉检验NDE人员必需是依据南京宝色钛业(资料号:QCD-011)进行考试和资格任命合格人员。 3. 方法综述 3.1 标准上,磁粉检验方法是指在工件受检区域表面施加铁磁粉,裂纹或其它缺点会造成正常磁场畸变,使表面上磁粉形成一定图形,这些图形通常是探测到缺点特征。 3.2 磁粉检验法灵敏度以表面缺点处为最高,并随离表面深度增加而快速降低;所以,本方法仅适适用于检验材料或部件表面或近表面缺点。 4. 磁化设备校验 4.1 MT设备采取CDX-4型磁轭式探伤仪。 4.2 设备校验 4.2.1 校验周期:每一带电流表磁化设备最少应
13、每十二个月校验一次;设备进行过关键电源修理,周期大修或损坏时,必需得到校验。假如设备已十二个月或十二个月以上未使用,则在第一次使用之前必需校验。 4.2.2 磁轭提升力校验 提升力用标准重块提升法来校验。交流电磁轭提升力最少为10lb(44N)(最大磁轭间距);直流电磁轭提升力最少为40lb(177N)( 最大磁轭间距)。 5. 检验介质* Co.,Ltd.焊缝检验规程3Rev.:0Page:4 of 7Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATIONferromagnetic particles which have high permea
14、bility 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 transfor
15、mer 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 concentration of suspended magnetic particles should be as specified of as recom
16、mended by the manufacturer and should be checked by settling volume measurements and maintained at the specified concentration on a daily basis. If the concentration is not maintained properly, test results can vary greatly. 5.4.2 The bath concentration shall be maintained within 1.2 to 2.4 ml per 1
17、00ml of vehicle for nonfluorescent particles unless otherwise specified by the particle manufacturer. 5.4.3 Bath concentration is normally determined by measuring its setting volume through the use of an ASTM Pear-shaped centrifuge tube with a 1.5-ml stem(0.1-ml divisions )for nonfluorescent suspens
18、ions. Before sampling, run the suspension through the recirculating system for at least 30-min to assure thorough mixing of all particles which could have settled on the sump screen and along the sides or bottom of the tank. Take a 100-mL portion of the suspension from the hose or nozzle and allow i
19、t to settle for approximately 30 min. The volume settling out at the bottom of the tube is indicative of the particle concentration in the bath. If the bath concentration is low in particle content, add a sufficient amount of particle materials to obtain the desired concentration. If the suspension
20、is high in particle content, add sufficient vehicle to obtain the desired concentration. 5.4.4 If the settled particles appear to be loose agglomerates rather than a solid layer, take a second sample. If still agglomerated, the particles may have become magnetized, replace the suspension. 6. Magneti
21、zation Procedure 6.1 Yoke Technique 6.1.1 The direct, alternating current electromagnetic yokes or permanent magnet yokes shall be used for localized magnetization to form a longitudinal magnetic field. 6.1.2 The alternating current electromagnetic yoke shall have a lifting power of at least 10 lb.
22、(4.5kg) at maximum pole spacing. The direct current electromagnetic yoke shall have a lifting power of at least 40 lb. (18.1kg) at the maximum pole spacing. 6.1.3 The field strength of yokes can be empirically determined 5.1 检验介质是含有高导磁率和低顽磁性细铁磁粉,其尺寸和形状必需易于形成磁粉显示。 5.2 应使用宜兴磁通探伤材料企业生产黑磁粉HK-1-400或350。
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