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ASME BPVC Section VIII, Division 2 - Design by analysis of welded joints

ASME BPVC Section VIII, Division 2 - Design by analysis of welded joints

ASME BPVC Section VIII, Division 2 - Design by analysis of welded joints

(OP)
Hello,

If a pressure vessel is to be designed by analysis and if the designer intends to validate the dimensions/geometry of the welded joints he specified without resorting to Part 4 for welded joint details, what steps should the designer take in order to analyse the weld joint?

For instance lets think of a "very simple" circular pressure vessel with flat faces on both ends and a category B type 2 circumferential weld joint on the main shell.
- What toe blend angle should the designer use for analysis?
- Should the designer define the weld face as an arc? Or perhaps some other more complex geometry like a spline?
- Can the designer apply small radius fillets to the weld toes as to avoid stress singularities?

Perhaps the answers to the above questions will allude to a sensitivity analysis, but I am curious about your opinion.

RE: ASME BPVC Section VIII, Division 2 - Design by analysis of welded joints

It somewhat depends on whether the component is in cyclic service or not.

There is no guidance provided in this regard, so a sensitivity analysis may be necessary. My strong recommendation, however, is to use the elastic-plastic analysis method for demonstrating Protection Against Local Failure.

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