【正文】 NDE 報告應由操作者編制，由NDE Ⅱ 級或 Ⅲ級 探傷員審核，并經(jīng)指定的 NDE Ⅲ 級人員批準，然后提交AI 認可。 ，但是以顯示尺寸作為合格評價的基礎。 、有爭議的顯示均應重新檢驗以決定它們是否為有效顯示。 受檢工件表面的觀察亮度必須至少為 50fc(500lx)。 b. relevant rounded indications greater than 3/16in. ()。 除非圖紙或其他技術文件中另有規(guī)定，任 何零件均應在完工的表面狀態(tài)，或最終機加工狀態(tài)，或最終熱處理狀態(tài)下進行磁粉探傷。 在磁粉檢驗之前，被檢驗的表面及其附近至少 1 英寸（ 25mm）的區(qū)域內(nèi)應實干燥的，并且沒有任何污垢、纖維屑、銹皮、焊劑和焊接飛濺、油污或其他能妨礙檢驗的外來物。 使用專用的碳鋼 /銅板磁場指示器來校驗零件表面的磁場強度和方向是否滿足要求。 根據(jù)經(jīng)驗磁軛式磁場強度可測量它的提升力來確定。 假如沉淀磁粉表現(xiàn)為松散的團塊，而不是緊密的敷層，則應作第二次取樣試驗，如果還是團塊，說明磁粉可能已被磁化，這時需更換懸浮液。 濕磁粉懸浮液的濃度 磁懸液濃度應按制造廠推薦，用沉淀量值驗證，務使日常濃度一定。 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 100ml of vehicle for nonfluorescent particles unless otherwise specified by the particle manufacturer. Bath concentration is normally determined by measuring its setting volume through the use of an ASTM Pearshaped centrifuge tube with a stem( divisions )for nonfluorescent suspensions. Before sampling, run the suspension through the recirculating system for at least 30min 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 100mL portion of the suspension from the hose or nozzle and allow it 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 is high in particle content, add sufficient vehicle to obtain the desired concentration. 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 bee magized, replace the suspension. 6. Magization Procedure Yoke Technique The direct, alternating current electromagic yokes or permanent mag yokes shall be used for localized magization to form a long