【正文】 02/04/2023 46 Version DNVOSC401”Fabrication and Testing of Offshore Structures” 02/04/2023 47 Version DNVOSC401”Fabrication and Testing of Offshore Structures” 02/04/2023 48 Version DNVOSC401”Fabrication and Testing of Offshore Structures” B5 超聲波測試 指示 1)2)3) 結(jié)構(gòu)類別 特殊結(jié)構(gòu) 重要結(jié)構(gòu) 次要結(jié)構(gòu) 回聲最大波長 4)，毫米 參考水平的 50% t/3 or maximum 10 參考水平的 100% t/2 or maximum 10 參考水平的 100% T or maximum 20 不能存在任何大小和振幅的缺陷 1）不論。 5) 在一條線上的缺陷，如缺陷之間的距離小于最大的一個缺陷的長度，則視其為一個連續(xù)性的缺陷。則視此夾渣線為一個缺陷。 3) 如焊接方向的缺陷的長度超過了其寬度的 3倍，則視其為線狀缺陷。 2) 如果氣孔之間的距離小于氣孔直徑的 3倍，可視其為形成線狀或串狀。 02/04/2023 45 Version DNVOSC401”Fabrication and Testing of Offshore Structures” 缺陷類別 結(jié)構(gòu)類別特殊結(jié)構(gòu) 重要結(jié)構(gòu) 次要結(jié)構(gòu)氣孔 1 ）， 2 ）非連續(xù)性的氣孔:最大氣孔直徑,mm t/5 ，最大 4 t/4 ，最大 5 t/3 ，最大 6成串的氣孔：最大氣孔直徑 ,m m 2 3 4管狀氣孔：最大長度， mm 20 25 30分散的氣孔：最大直徑， mm （分散范圍大于 1 0 1 5 0 m m ） 15 20 25夾渣 1 ）， 3 ）， 4 ）最大寬度， mm t/5 ，最大 4 t/4 ，最大 6 t/3 ，最大 6最大長度， mm t 2t 4t未全焊透長度 5 ）， 6 ） m m 要求焊透的區(qū)域，無 ≤ t ，最大 25 ≤ 2t ，最大 50熔深不足 5 ）， 6 ） m m ≤ 2t ，最大 50裂紋 無 無 無表 B 4 X 光片的驗收標(biāo)準(zhǔn)無1) 如果相同的缺陷（氣孔或夾渣）之間的距離小于其中最大的一個缺陷的長度，可以考慮其是否為一個連續(xù)的缺陷。凹槽處焊接需進(jìn)行輕微的或最小程度的加固，或進(jìn) 行根部滲透，但不要超過 3毫米。單個氣孔小于 t/4 ，不大于 4t 代表金屬板厚度 總體要求：焊接需保證形狀和尺寸正確無誤。其它區(qū)域應(yīng)小于 0. 75 m m電焊外觀和磁粉探傷的驗收標(biāo)準(zhǔn)表 B 3, 電焊外觀和磁粉探傷的驗收標(biāo)準(zhǔn)缺陷類別受拉應(yīng)力的部分無氣孔。超聲波探傷的板厚應(yīng)大于 10m mⅠⅡⅢ非鐵磁體材料可以采用液體滲透試驗。 02/04/2023 41 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? NDT shall normally be carried out to an extent not less than required in Table B1. ? 無損探傷的范圍不得小于以下 B1表的要求。 ? Radiographic examination may be replaced by ultrasonic examination and vice versa, when methodologically justifiable and in agreement with the purchaser. ? 在能達(dá)到同等效果的情況下，經(jīng)過船東同意，拍片和超聲波探傷可以互換。兩個構(gòu)件的焊接檢驗應(yīng)該按照高級別構(gòu)件的檢驗標(biāo)準(zhǔn)來進(jìn)行檢驗。因為視察時第一位，同時也是作重要的步驟。此證書須注明其具有運用何種檢驗方法的資格和操作人員的能力范圍。報告要指明缺陷所在位置以及是否符合規(guī)范要求。 ? All welds shall be 100% visually inspected prior to carrying out NDT. ? 無損探傷前焊縫應(yīng)進(jìn)行 100%外觀檢驗。對于級別低于 NV36（ 包括 NV36） 和板厚小于 40MM的 NV 42的材料焊接，如果連續(xù)的記錄表明產(chǎn)生延遲裂紋的概率很低，則經(jīng)過船東、船檢同意，檢驗和無損探傷的開始時間可以少于 48小時。 02/04/2023 35 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? Methods of NDT shall be chosen with due regard to the conditions including the sensitivity of the method and the method’s ability to detect defects likely to occur as a consequence of the chosen welding process. ? 針對不同的焊接程序應(yīng)該采用不同的無損探傷形式，確保探傷的準(zhǔn)確性。 ? The inspection categories shall be defined in accordance with DNVOSC101 or DNVOSC201 Sec 4 and shall be specified in relevant design drawings. ? 檢驗范圍要符合 DNVOSC101 或 DNVOSC201 Sec 4的規(guī)定。再次探傷的范圍要大于前次探傷的范圍。超過這個范圍必須得到船東、船檢的認(rèn)可。 02/04/2023 33 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? Minor discontinuities may be removed by grinding or machining, making a smooth transition into the surrounding material. The thickness shall not be reduced to less than 93% of the nominal thickness but in no case by more than 3 mm. The extent of such repair shall be agreed upon. ? 部分小的缺陷可以通過打磨和機(jī)械加工來清除，清除區(qū)域要保持過渡光順。 ? For planar defects the repair length on either side of the defect shall be 50 mm longer than the size of the defect as confirmed by NDT ? 對無損探傷發(fā)現(xiàn)的缺陷進(jìn)行修補時，返工的長度要確保兩頭都要超過缺陷長度 50MM。C above the level specified for production welding and be at least 100186。 ? Whenever a defect is removed, the gouged and ground area shall be examined by magic particle testing or other suitable methods to verify plete removal ? 用碳刨或打磨清除缺陷后，要用磁粉探傷來確認(rèn)缺陷已完全清除。 ? The mechanical properties of repair weld shall satisfy the minimum specified properties of the steel in question. ? 電焊的修補要確保結(jié)構(gòu)的機(jī)械性能。 ? Defects in welds may be rectified by grinding, machining or welding. Welds of insufficient strength, ductility or notch toughness shall be pletely removed prior to repair. ? 焊接缺陷可以通過打磨、機(jī)械加工或者電焊進(jìn)行修補。 02/04/2023 31 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? Repairs shall be carried out in accordance with qualified repair procedures subject to 。所有焊工都要接受定期檢查。 ? Welding production tests shall be made during fabrication of welds in special areas and in primary structural elements to verify that the produced welds are of acceptable quality. Minimum one test coupon is required from each applied welding process. ? 主體結(jié)構(gòu)和重要結(jié)構(gòu)的焊接要通過同等環(huán)境下的試驗來驗證其可靠性，每種結(jié)構(gòu)至少做一個試驗。 02/04/2023 30 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? Storage and handling of welding consumables shall be in accordance with the manufacturer39。端頭電焊要光順，與板邊保持平直。 02/04/2023 29 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? Recycling of fluxes for submergedarc welding shall be performed in a manner that ensures a mixture of new and used flux with continually homogenous properties. ? 焊劑的回收利用以及新老焊接的混合使用要保證焊劑的純度。 ? Grooves produced by gouging shall be followed by grinding removing carbonized material and the groove shall be dressed to a shape consistent with tolerances in agreement with the purchaser. ? 碳刨坡口要用打磨的方法去除滲碳層，坡口成型的公差范圍也要得到船東的認(rèn)可。 02/04/2023 28 Version DNVOSC401”Fabrication and Testing of Offshore Structures” ? When resuming welding on partially filled joints in special areas, preheating shall be performed and the temperature within the specified tolerances, shall if not otherwise agreed, be equal to the interpass temperature for the welding pass in question. ? 在多道焊焊縫未一次性焊完的情況下，繼續(xù)施焊前需要按要求對焊縫進(jìn)行加熱。 ? All fabrication welding shall be performed within the limits of essential variables of the qualified welding procedure. This also includes tack welding, seal welding, welding of lifting lugs and attachment welds as well as repair welding. ? 所有的焊接都不能超過認(rèn)可的焊接工藝范圍。 ? Tack welding shall, when integrated in production welding, be qualified. For welds specified in 112 a WPS shall be submitted to the purchaser for acceptance. ? 定位焊作為結(jié)構(gòu)焊的