UW11(a)（5）的理解

emperor620

对于UW11(a)（5）的理解一直存在疑惑
all Category A and D butt welds in the shell and heads of vessels where the design of the joint or part is based on a joint efficiency permitted by UW-12(a), in
which case:
(a) Category A and B welds connecting the shell or heads of vessels shall be of Type No. (1) or Type No.(2) of Table UW-12;
(b) Category B or C butt welds [but not including those in nozzles and communicating chambers except as required in (4) above] which intersect the Category A butt welds in the shell or heads of vessels or connect seamless vessel shell or heads shall, as a minimum, meet the requirements for spot radiography in accordance with UW-52.
Spot radiographs required by this paragraph shall not be used to satisfy the spot radiography rules as applied to anyother weld increment.对于筒体和封头上的A以及D类焊缝如果按照UW-12(a)焊接系数，则此A和D类焊缝就需要100%RT？是不是这样理解？
但是如果是按照UW-12(a)设计的焊接接头，本来就应该要100%RT了，何必要多此一举呢？ 对此，大家有何高见？

xdflysky

个人理解,这里说的主要是焊缝交叉出的探伤,
UW-12(a)的表达的意思是,焊缝系数E的取1的时候,焊缝必须是100%RT的,但是如果不满足UW-11(a)5的条件,那么焊缝系数不能取1.
UW-11(a)5(b)中要求与A类焊缝相交的B,C类焊缝需要满足局部探伤.

所以整个这段的意思是: A.D类焊缝100%RT了,与其他焊缝相交,(T型焊缝),相交如果要进行局部RT探伤,那么焊缝系数取1,如果没有进行局部RT探伤,焊缝系数不能取1,而是按照交叉的焊缝中焊缝系数小的那个取值.

霜落林空

all Category A and D butt welds in the shell and heads of vessels ，前提是对接接头。

emperor620

xdflysky 发表于 2013-9-5 13:08
个人理解,这里说的主要是焊缝交叉出的探伤,
UW-12(a)的表达的意思是,焊缝系数E的取1的时候,焊缝必须是100% ...

也就是说要满足（a）（b）两个条件之后才能决定A,D类的对接焊缝焊接系数为UW12(a)？如果不行，如果不能满足，如不能交叉焊缝不能局部探伤，则A,D焊缝就不能取uw12（a）的焊接系数？ 在UW12(A)有如下：
A value of E not greater than that given in column (a) of Table UW-12 shall be used in the design calculations for fully radiographed butt joints [see UW-11(a)], except that when the requirements of UW-11(a)(5) are not met,a value of E not greater than that given in column (b) of Table UW-12 shall be used.
也就是说不能满足UW11(a)（5），则焊缝系数不能超过UW12(b)的规定值？

太阳之城

是的，如果是对接环焊缝，就要满足UW11(a)(5) 这可能是考虑对接焊缝的受力状态，再有一个就是那里如果不检测就有不是100%无损检测的嫌疑