【文章內(nèi)容簡介】 rce and when the “sourcetomaterial” distance is less than the inside radius of the ponent。 (3) curved or spherical ponents whose convex side is toward the source. (b) Film Side Markers. (1) Location markers shall be placed on the film side when radiographing either curved or spherical ponents whose concave side is toward the source and when the “sourcetomaterial” distance is greater than the inside radius. (2) As an alternative to source side placement in (a), location markers may be placed on the film side when the radiograhp shows coverage beyond the location markers to the extent demonstrated by ，ie Leff = (x + Mf + x)。 (2) 彎曲面或球面工件，其凹面朝著射線源，當“射源至材料”距離小于工件內(nèi)半徑時； (3) 彎曲面或球面工件，其凸面朝著射線源。 (b) 膠片側標記 (1) 當透照凹面朝射源的曲面或球面工件，且“射源至材料”的距離大于工件內(nèi)半徑時，定位標記應放在膠片側。 (2) (a)放在射源側而放在膠片側時，要求底片上顯示的有效范圍超過定位標記之外一定長度(見圖3，即Leff = (x + Mf + x)。 定位標記 Location marker D t x Mf x Fig. 3 圖3 x= (t / D) (Mf / 2)x= additional required coverage, beyond film side location markert= ponent thicknessMf= film side location marker interval D= source to ponent distancex= (t / D) (Mf / 2)x:在膠片定位標記兩側要求附加覆蓋范圍t ：工件厚度Mf ：兩膠片側定位標記之間的間距D：射源至工件表面距離 ****** Co.,Ltd.焊縫檢驗規(guī)程4Rev.:0Page:8 of 14Title: RADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDS (c) Either Side Markers. Location markers may be placed on either the source side or film side when radiographing either curved or spherical ponents whose concave side is toward the source and the “sourcetomaterial” distance equals the inside radius of the ponent. Doublewall viewing, at least one location marker shall be placed on the source side surface adjacent to the weld (or on the material in the area of interest) for each radiograph. A system shall be used to produce permanent identification on the radiograph traceable to the contract, ponent, weld seam, or part numbers， as appropriate. On the radiograph, the following shall be plainly and permanently included and in any case this information shall not obscure the area of interest. (1) ****** (Co name) (2) Job No. (3) Weld seam No. (4) Radiograph No. (5) Repair mark, if applicable (6) Location markings (7) Thickness of base material (8) Date of radiography Facilities for Viewing of Radiographs Illuminator used to view radiographs shall be verified that it has sufficient intensity to be visible for the essential wire diameter of IQI and can diffuse the light uniformly. When the radiograph is smaller than the viewing portion of illuminator or will include low density areas, the masks shall be provided to exclude any extraneous light. In order to obtain the necessary brightness through the radiograph at least 30cd/m2, the viewing equipment shall have the following illumination: Table 6 (c) 兩側均可標記射線照曲面或球面工件，其凹面朝著射源，且“射源至工件”距離等于工件內(nèi)半徑時，則標記可放在射源側，也可以放在膠片側。 雙壁成像法 雙壁成像時，在射源側表面焊縫附近(或在有效區(qū)工件上)至少放一個定位標記。 標識 底片上應有永久標識，即合同號、部件號、焊縫號或工件號等。 下列永久性標識應明確無誤地顯示在底片上，且不得干擾有效評定區(qū)。(1) 南京寶色鈦業(yè)有限公司(******)； (2) 工件號； (3) 焊縫號 (4) 底片號； (5) 返修標記； (6) 定位標記； (7) 母材厚度； (8) 透照日期； 觀片設備 必須校驗觀片設備燈是否有足夠的光強觀看象質(zhì)計應顯線徑，能否均勻地擴散燈光。當?shù)灼∮谟^片燈屏尺寸或存在低黑度區(qū)域時，應遮檔多余光線。 為使底片透過光強至少為30cd/m2,觀片燈應有表6所示照明亮度。 表 6Radiograph DensityMinimum Illumination底片黑度最小照明亮度3,000cd/m23，000 cd/m230,000 cd/m230，000 cd/m2300,000 cd/m2300，0000 cd/m2 Viewing Room Subdued background lighting shall be provided such that the intensity shall not cause troublesome reflection, shadows or glares on the radiograph. 4. Check of Surface to be Radiographed Prior to starting of radiographic examination, the 觀片室 應提供柔和的背景光線，光線亮度不得在底片上產(chǎn)生有干擾作用的反射、陰影或眩光。 4. 被檢表面檢查射線透照檢測前，RT人員必須****** Co.,Ltd.焊縫檢驗規(guī)程4Rev.:0Page:9 of 14Title: RADIOGRAPHIC EXAMINATION PROCEDURE FOR BUTT WELDSExaminer shall check or verify that the surface to be radiographed satisfies the following conditions: The reinforcement of butt welded joints is within the value specified in Section Ⅷ Division 1 as shown in Table 7 Table 7 表7檢查或驗證被檢表面是否滿足下述條件： 對接焊縫余高應在第Ⅷ卷第1分冊規(guī)定的數(shù)值內(nèi)。NominalThickness,in.(mm)Maximum Reinforcement,in. 最大余高in,(mm)Category B amp。 C Butt weldsB 和C類對接焊縫Other Welds其它焊縫Less than 3/32()3/32()1/32()3/32 to 3/16, incl. (~)1/8()1/16()Over 3/16 to 1/2,incl. (~)5/32()3/32()Over 1/2 to 1,incl. (~)3/16()3/32()Over 1 to 2,incl. (~)1/4()1/8()Over 2 to 3,incl. (~)1/4()5/32()Over 3 to4,incl. (~)1/4()7/32()Over 4 to 5,incl. (~127)1/4()1/4()Over 5(127)5/16()5/16()GENERAL NOTES: (a) For double welded butt joints, this limitation on reinforcement given above shall apply separately to both inside and outside surfaces of the joint. (b) For single welded butt joints, the reinforcement limits given above shall apply to the outside surface of the joint only. (c) Thickness of weld reinforcement shall be based on the thickness of the thinner of the materials being joined.