無損檢測磁粉檢驗工藝規(guī)程-在線瀏覽
2024-12-24 21:45本頁面
【正文】 ation”(No.:QCD011). 3. Description of Method In principle, the magic particle examination method involves magizing an area to be examined, and applying ferromagic particles to the surface. The particles will form patterms on the surface where cracks or other discontinuties cause distortions in the normal magic field. These patterns are usually characteristic of the type of discontinuity that is detected. The sensitivity of the magic particle examination is greatest for surface discontinuities and diminishes rapidly with increasing depth of discontinuities 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. Magization Equipment and Calibration The MT equipment to be used is Yoke, with Type CDX4. Calibration of Equipment Frequency of calibration: Each Magizing 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 to first use. Calibration for lifting power of the Yoke The lifting power will be calibrated with the methods of lifting a standard weight cake. Each alternatingcurrent electromagic yoke shall have a lifting power of at least 10lb(44N). at the maximum pole spacing. Each directcurrent electromagic yoke shall have a lifting power of at least 40lb(177N). at the maximum pole spacing. 5. Examination Medium The examination medium shall be the finely divided 1. 概述 本規(guī)程適用 于 ASME 規(guī)范產(chǎn)品鐵磁性材料和焊縫的磁粉檢驗。 本規(guī)程適用于磁軛濕粉連續(xù)磁化法技術(shù)。 本規(guī)程在執(zhí)行之前須通過演示，使 AI 審查滿意。 3. 方法綜述 原則上，磁粉檢驗方法是指在工件受檢區(qū)域表面施加鐵磁粉，裂紋或其它缺陷會導致正常磁場畸變，使表面上的磁粉形成一定圖形，這些圖形通常是探測到的缺陷特征。 4. 磁化設(shè)備校驗 MT 設(shè)備采用 CDX4型磁軛式探傷儀。如果設(shè)備已一 年或一年以上未使用，則在第一次使用之前必須校驗。交流電磁軛提升力至少為10lb(44N)(最大磁軛間距 )。 5. 檢驗介質(zhì) 更多免費資料下載請進： 好好學習社區(qū) ****** Co.,Ltd. 焊縫檢驗規(guī)程 3 Rev.:0 Page:4 of 7 Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATION ferromagic particles which have high permeability and low retentivity. The size and shape of the magic particles shall be suitable for forming magic particle indications. The black magic particles HK1400or 350, made by yixin Citong Co Ltd., shall be used. The fluid medium for the magic 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). Concentration of wet magic particle suspensions The initial bath concentration of suspended magic particles should be as specified of as remended 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. The bath concentration shall be maintained within to ml per
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