無(wú)損檢測(cè)磁粉檢驗(yàn)工藝規(guī)程(完整版)
【正文】 , Examination, Qualification amp。 磁粉檢驗(yàn)法的靈敏度以表面缺陷處為最高，并隨離表面深度的增加而迅速降低；因此，本方法僅適用于檢驗(yàn)材料或部件的表面或近表面缺陷。 應(yīng)使用宜興磁通探傷材料公司生產(chǎn)的黑磁粉 HK1400 或 350。 6. 磁化過程 磁軛法 可采用直流的、交流的電磁軛或永久磁軛、來(lái)磁化一個(gè)局部區(qū)域、形成一個(gè)縱向磁場(chǎng)。如果銅板邊有清晰的磁粉線條，則表明磁場(chǎng)強(qiáng)度是足夠的。 零件上的小開口、槽或孔，應(yīng)在檢驗(yàn)前堵塞好以防磁粉進(jìn)入。 9. 顯示評(píng)定及合格標(biāo)準(zhǔn) 磁粉顯現(xiàn)評(píng)定 磁粉保留一段時(shí)間回顯示 出磁線，并不是所有顯示出來(lái)的都是缺陷，因受檢表面粗燥（如在熱影響區(qū)邊緣），導(dǎo)磁發(fā)生變化等原因，會(huì)產(chǎn)生類似于缺陷的顯示。 10. 退磁 當(dāng)剩磁對(duì)零件附加工或使用有影響時(shí)，該零件在磁粉檢驗(yàn)后應(yīng)及時(shí)進(jìn)行退磁。 12. 記錄和報(bào)告 操作員必須記錄檢驗(yàn)詳情和結(jié)果，必要時(shí)要用膠帶紙、照相或其他 更多免費(fèi)資料下載請(qǐng)進(jìn)： 好好學(xué)習(xí)社區(qū) ****** Co.,Ltd. 焊縫檢驗(yàn)規(guī)程 3 Rev.:0 Page:7 of 7 Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATION 12. Records and report The examination details and results shall be recorded by the operator. When necessary, the permanent records may be made by adhesive tape, photograph or other means. NDE report shall be prepared by the operator, reviewed by the NDE LevelⅡ or Ⅲ and approved by the Level Ⅲ prior to submission to the AI for acceptance. Report form, see Page 8 of 7. 方法作永久性記錄。 b. 面形顯示是指一個(gè)圓形和橢圓的長(zhǎng)度或等于寬度的 3 倍的顯示。 更多免費(fèi)資料下載請(qǐng)進(jìn)： 好好學(xué)習(xí)社區(qū) ****** Co.,Ltd. 焊縫檢驗(yàn)規(guī)程 3 Rev.:0 Page:6 of 7 Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATION (at least 10%) to assure 100% coverage at the established sensitivity. The repaired area shall be reexamined according to the original examination procedure. The intensity of the visual light at the surface of the part /work piece undergoing examination shall be a minimum of 50fc (500lx). 9. Evaluation of indications and acceptance standards Evaluation of indications Indications will be revealed by retention of magic particles. All such indications are not necessarily imperfections, however, since excessive surface roughness, magic permeability variations (such as at the edge of heat affected zones), etc., may produce similar indications . An indication is the evidence of a mechanical imperfection. Only indications which have any dimension greater than 1/16in. () shall be considered relevant. a. A linear indication is one having a length greater than three times the width. b. A rounded indication is one of circular or elliptical shape with a lenth equal to or less than three times the width. c. Any questionable or doubtful indications shall be reexamined to determine whether or not they are relevant. d. Broad areas of particle accumulation which might mask indications from discontinuities are prohibited, and such areas shall be cleaned and reexamined. Acceptance standards (per Appendix 6 of Section Ⅷ ) These acceptance standards shall apply unless other more restrictive standards are specified for specific materials or applications. All surfaces to be examined shall be free of : a. relevant linear indications。然而，表面不平（不均勻）會(huì)掩飾缺陷的顯示，則這些地方要通過打磨或機(jī)加工進(jìn)行表面制備。 經(jīng)驗(yàn)磁軛式磁場(chǎng)強(qiáng)度可測(cè)量它 更多免費(fèi)資料下載請(qǐng)進(jìn)： 好好學(xué)習(xí)社區(qū) ****** Co.,Ltd. 焊縫檢驗(yàn)規(guī)程 3 Rev.:0 Page:5 of 7 Ti
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