ASME中RT检验要每个焊口拍2张片子吗？

ASME无损检测中RT检验要每个焊口拍2张片子吗？

顶一下？？？？？？？？？？？？？？？？？

Double-Wall Technique. When it is not practical
to use a single-wall technique, one of the following
double-wall techniques shall be used.

(a) Single-Wall Viewing. For materials and for welds in
components, a technique may be used in which the radiation
passes through two walls and only the weld (material)
on the film-side wall is viewed for acceptance on the
radiograph. When complete coverage is required for circumferential
welds (materials), a minimum of three exposures
taken 120 deg to each other shall be made.
(b) Double-Wall Viewing. For materials and for welds in
components 31/2 in. (89 mm) or less in nominal outside
diameter, a technique may be used in which the radiation
passes through two walls and the weld (material) in both
walls is viewed for acceptance on the same radiograph.
For double-wall viewing, only a source-side IQI shall be
used.
(1) For welds, the radiation beam may be offset from
the plane of the weld at an angle sufficient to separate the
images of the source-side and film-side portions of the
weld so that there is no overlap of the areas to be interpreted.
When complete coverage is required, a minimum
of two exposures taken 90 deg to each other shall be
made for each joint.
(2) As an alternative, the weld may be radiographed
with the radiation beam positioned so that the images of
both walls are superimposed. When complete 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.
(3) Additional exposures shall be made if the required
radiographic coverage cannot be obtained using
the minimum number of exposures indicated in (1) or (2) above.

jerryru 发表于 2016-7-9 09:11
顶一下？？？？？？？？？？？？？？？？？

ASME 无损检测中 RT 检验要每个焊口拍2张片子吗？
答：一般情况下，没有这种说法。
    只有 UW-11 (a) Full Radiography       UW-51
                        (b) Sport Radiography    UW-52
                        (c) No Radiography
      至于其他拍2张片子应该说是特殊情况。

提问题把问题叙述清楚！无损检测人员是学历越来越高，考的证是越来越多，技术水平是越来越差。

没有这个要求。需要拍2张片子的情况是在RT2下封头与筒体的那道缝。

对接接头的RT一般需要两个方向透照，因而2两张片子，但因结构原因只能照一个方向的，需提出偏差申请，由业主同意后执行

要根据管径、壁厚来确定，反正至少两张，规范中有规定的。

RE: ASME中RT检验要每个焊口拍2张片子吗？ [修改]

坛子里高手多啊，长见识