無損檢測磁粉檢驗工藝規(guī)程-文庫吧資料
2024-10-29 21:45本頁面
【正文】 examined. 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。 零件上的小開口、槽或孔，應在檢驗前堵塞好以防磁粉進入。使用磁軛法時，應按 ASME 法規(guī)第 Ⅴ 卷第 7 章強制性附錄 Ⅰ 之要求，驗證涂層厚度的影響。 可使用去污劑、有機溶劑、除繡劑、除繡液、去漆劑、蒸氣除油、噴沙或超聲波清洗等方法達到清潔的目的。然而，表面不平（不均勻）會掩飾缺陷的顯示，則這些地方要通過打磨或機加工進行表面制備。如果銅板邊有清晰的磁粉線條，則表明磁場強度是足夠的。 受檢區(qū)域應限制在兩磁極連線的雙側(cè)，相當于 1/4 最大磁極間距的范圍內(nèi)，磁極間距每次至少有 1 英寸（ 25 毫米）的搭接。 磁化方向 每一區(qū)域應至少進行兩次分別檢驗。 經(jīng)驗磁軛式磁場強度可測量它 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:5 of 7 Title: PROCEDURE FOR MAGNETIC PARTICLE EXAMINATION by measuring its lifting power. Direction of magization: At least two separate examinations shall be carried out on each area. The second examination shall be with the lines of magic flux approximately perpendicular to those used for the first examination in that area. The area to be examined shall be restricted to the area which is equal to 1/4 maximum pole spacing on both sides of the line through two poles. The pole spacing shall at least have 1in. (25mm)overlap each time. 7. Magic Field Strength The special carbon steel / copper plate type field indicator is used to verify that an adequate field strength and direction for the surface of part is obtained. If the clear magic particle pattern is shown on the copper plate side of the field indicator, it indicates that adequate field strength is obtained. 8. Examination Requirements Surface Preparation Satisfactory results are usually obtained in the aswelded, asrolled, ascast, or asfed conditions. However, surface preparation by grinding or machining may be necessary where surface irregularities could mask indications due to discontinuities. Prior to magic particle examination, the surface to be examined and all adjacent areas within at least 1in.(25mm) shall be dry and free of all dirt, grease, lint, scale, welding flux and spatter, oil, or other extraneous matter that could interfere with the examination. Cleaning may be acplished using detergents, anic solvents, descaling solution, paint removers, vapor degreasing, sand or grit blasting, or ultrasonic cleaning methods. If coatings are left on the part in the area being examined, it must be demonstrated that indications can be detected through the existing maximum coating thickness applied. When AC yoke technique is used, the demonstration must be in accordance with Mandatory AppendixⅠ of Article 7 of ASME Code SectionⅤ . Unless specified on the drawings or other technical documentation, the magic particle examination shall be carried out on the parts with finished surface condition, or finishedmachined condition and final heat treatment condition. The small opening, slots or holes in the parts can be blocked to prevent the magic particle
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