无损检测工艺规程对接焊缝射线.docx

1、无损检测工艺规程对接焊缝射线NJBST Co.,Ltd.QCD-012Rev.:0Page:1 of 17Title: RADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDSRADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDS对接焊缝射线检测工艺规程 CONTROLLED 在控本 UNCONTROLLED 非在控本 COPY NO 副本编号：PREPARED BY DATE 日期： REVIEWED BY DATE 日期： APPROVED BY DATE 日期：NJBST Co.,Ltd.QCD-012

2、Rev.:0Page:2 of 17Title: RADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDS1.General 1.1 This procedure is applied to the x-ray radiographic examination of butt welds for pressure vessels constructed in accordance with ASME Code Section Div1. 1.2 This procedure shall be supplemented, when necessary,

3、with the examination instructions defining more specific variables, which will be prepared by NDE Level personnel. 2. Qualification of Examination Personnel 2.1 Any person engaged in the radiographic examination shall be qualified and certified as a radiographic examiner in accordance with NJBST Co.

4、, Ltd.s “Written Practice for NDE Personnel Training, Examination, Qualification and Certification(NO.: QCD-011). 2.2 The NDE Levelshall receive the necessary instruction or supervision from a certified NDE Level or Level Examiner. The NDE Level shall receive the instruction or supervision from a ND

5、E Level Examiner. 2.3 According to the respective responsibility range, all examiners shall complete the examination conforming to the referencing ASME Code Sections, standards and written instructions. They shall assure the working quality. 3. Equipment , Tools and Materials The LevelExaminer shall

6、 select the equipment, tools and materials to assure that they are in compliance with the following conditions and the requirement of the examination instruction. 3.1 One of the x-ray equipment shall be selected from Table 1. Table 1 1. 概述 1.1 本工艺规程适用于按ASME 标准第卷第册要求制造的压力容器的对接焊缝的x射线照相检测。 1.2 必要时，本工艺规

7、程应由探伤作业指导书进行补充以规定更详细的变量，此指导书由NDE 级人员编制。 2. 检测人员资格的(文件号：QCD-011)进行资格考核评定。 2.2 NDE级须接受合格的级或级必要的指导或监督。NDE级须接受NDE 级的指导或监督。 2.3 根据各自的职责范围，所有检测人员应按ASME标准有关卷，标准和作业指导书进行检测并保证工作质量。3.设备、器材级人员所选用的设备、器材应能保证符合以下条件和探伤作业指导书的要求。 3.1 X射线设备应从表1中选用。TypeMfr.Max. TubeVoltabe(KVp)Max. TubeCurrent(mA)Foc. Size(mm)Permitte

8、d max. material thick(mm)SteelTiZrxx-2505Beijing25052 x 2386322xx-3005Dandong30051467028 表 1类型制造厂家最大管电压KVp最大管电流mA焦点尺寸(mm)允许的材料最大穿透厚度mmSteelTiZrxx-2505北京25052 x 2386322xx-3005丹东3005467028 3.2 Film Film selection shall be in accordance with SE-1815, Standard Test Method for Film Systems for 3.2 胶片 胶片须

9、根据SE-1815工业射线照相的胶片系统分类的标准测试方法来选择。胶片分类表应由胶片制造厂提供。胶片NJBST Co.,Ltd.QCD-012Rev.:0Page:3 of 17Title: RADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDSIndustrial Radiography. The classification table of film shall be provided by the film manufacturer. Film system classes Special, ,W-A, and W-B are permitt

10、ed. Depending on the x-ray penetration thickness, a suitable film shall be selected. When using two films method, two different types of film shall be selected. 3.3 Screen A suitable lead screen shall be selected from Table 2. Table 2系统分为特殊、,W-A,和W-B。应根据X射线穿透厚度，选择适宜的胶片。采用双片法时，应选用两种不同类型的胶片。 3.3 增感屏 从

11、表2中选择适当的铅增感屏。 表2Tube VoltageThickness of lead Screen(mm)管电压铅增感屏厚度(mm)FrontBack前 屏后 屏150kv150kv300kv (6.49.5)(0.25)6(0.2)5 (9.512.7)(0.33)7(0.25)6 )(0.4)8(0.33)7 (19.125.4)(0.51)9(0.4)8Over1.00thr.1.50 (25.438.1)(0.64)10(0.51)9 (38.150.8)(0.81)11(0.64)10 3.5.2.2 For welds with reinforcements, the thi

12、ckness on which the IQI is based is the nominal single wall thickness plus the estimated weld reinforcement not to exceed the maximum permitted by the SectionDivision 1. For welds without reinforcements, the thickness on which the IQI is based is the nominal single wall thickness. In both cases back

13、ing rings or strips shall not be considered as part of the weld thickness in IQI selection. 3.5.3 Placement of IQIs 3.5.3.1 The IQI(s) shall be placed on the source side of the part being examined. When configuration or size prevents placing the IQI(s) on the part or weld, the IQI(s) may be placed o

14、n a separate block in compliance with para. T-277.1 of Section V. The separate block shall be placed as close as 3.5.2.2 对有余高焊缝，象质计放处的厚度是标称单壁厚度加上不超过第卷第一分册中允许的焊缝 最大余高估计值。没有余高的焊缝，象质计放处的厚度是标称单壁厚度。在以上两种情况下，衬环或衬带均不作为焊缝厚度的一局部来考虑。 3.5.3 象质计的放置 3.5.3.1 象质计必须放在被检工件的射线源侧。当透照布置或结构尺寸阻碍象质计放在工件或焊缝上时，象质计可放在一个单独的试块

15、(符合ASME第卷T-277.1要求)上。此试块的放置应NJBST Co.,Ltd.QCD-012Rev.:0Page:6 of 17Title: RADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDSpossible to the part being radiographed. 3.5.3.2 Where inaccessibility prevents hand placing the IQI(s) on the source side, the IQI(s) shall be placed on the film side in contac

16、t with the part being examined. A lead letter “F shall be placed adjacent to or on the IQI(s). 3.5.3.3 The IQI(s) shall be placed on the weld so that the length of the wires is perpendicular to the length of the weld. The identification number(s) and , when used, the lead letter “F shall not be in t

17、he area of interest, exept when geometric configuration makes it impractical. 3.5.4 Number of IQIs 3.5.4.1 When one or more film holders are used for an exposure, at least one IQI image shall appear on each radiograph. 3.5.4.2 If the density of the radiograph anywhere through the area of interest va

18、ries by more than minus 15% or plus 30% from the density adjacent to the designated wire of a wire IQI, within the minimum/maximum allowable density ranges specified, then an additional IQI shall be used for each exceptional area or areas and the radiograph retaken. 3.5.4.3 For cylindrical component

19、s or spherical components where the source is placed at the center of the component for a single exposure, at least three IQIs, spaced approximately 120deg. apart, are required. 3.5.5 IQI Sensitivity Radiography shall be performed with a technique of sufficient sensitivity to display the essential w

20、ire of a wire IQI, which is essential indication of the image quality of the radiograph. The radiographs shall also display the identifying numbers and letters. If the essential wire do not show on any film in a multiple film technique, but do show in composite film viewing, interpretation shall be

21、permitted only by composite film viewing. 3.6 “B Mark A lead symbol “B, with minimum dimensions of 13mm in height and 1.6mm in thickness, shall be attached to the back of each film holder during each exposure to determine if backscatter radiation is exposing the film. 3.7 Location Markers The image of the location markers for the coordination of the part w