eg to each other shall be made for each joint.Р对于焊缝,射线束应与焊缝平面倾斜一个足够的角度,以便将源侧的焊缝部分和胶片的焊缝影象分开。这样就不会出现评定区域的重叠。当要求全部覆盖时,每个接头至少要进行两次互成90°的暴光РAs an alternative, the weld may be radiographed with the radiation beam positioned so that the imaged of both wall are superimposed. plete coverage is required, a minimum of three exposures taken at either 60 deg. or 120 deg to each other shall be made for each joint.Р另一种方法是将射线束置于某个位置对焊缝进行射线照相,使两壁的影象重叠在一起。当要求完全覆盖时,每个接头至少要进行3次互成60或120的暴光。РAdditional exposures shall be made if the required radiographic coverage cannot be obtained using the minimum number of exposures indicated in (1) or (2) above.Р如果以上(1)(2)的最少暴光次数还不能达到射线照相全部覆盖的要求,则应增加暴光次数。РIQI SelectionР 具体检测要求Р The designated essential minimum wire diameter shall be as specified in Table 9.Р应显示的最小线径须按表9规定。
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