Issues with corner crack inspection?
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As shown in the figure, can the angular joints between the tube box inclined cone and the cylinder section be inspected only by ultrasonic testing, or by penetrant testing and magnetic particle testing? https://bbs.hcbbs.com/data/attachment/forum/201906/01/132812f4n4y4yx5pc75x6d.jpg
All the corner welds of the tube sheet can be inspected; what is the reason why this one cannot be inspected?
This is a butted joint (to be welded as a butted joint), and non-destructive testing shall be carried out in accordance with Class B welded joints; it cannot be welded as a fillet weld.
This post was last edited by wanlirn on 2019-6-9 09:23. According to welding terminology, joints with an angle of 135 degrees or more are considered butt joints; under Category B, those with a smaller angle are regarded as fillet joints, while those under Category D fall into another category； ；
According to GB150.1, clause 4.5.1, it is clear that this is a Class B joint, and therefore partial or 100% RT or UT testing must be carried out. This weld is subjected not only to overall film stress but also to secondary edge and bending stresses; RT is therefore a suitable choice.