Thin-Out of ASME Heads 1

[keens]

Hello All,

During the forming process of ASME Heads, where does the most Thin-out occur? Or what area of the Head will see the highest stresses? Thanks....

 

[weldtek]

Konrad,
In your example, the weld qualifications for 10mm would work because nominal joint thickness is the thinner of the two members joined ( see UW 40 (5)(a).0

SnTMan,
Exactly!

 

[Konrad]

weldtek, not necessarily. If the transition between 10 and 12 is made by buildup on the 10mm plate- then you need 12mm qualification. The weld is 12mm thick.
Konrad

 

[weldtek]

Konrad,
Yes, I replied without thinking the question through. The rules for dissimilar thickness weld procedures are given in Sec IX, QW 202.4, and for certain base metals, not all, a qualification on 12 mm, for the case you cite, would be necessary. I apologize for the confusion.

 

[GenB]

weldtek,
I see you worry about the qualifications.
in designing a vessel, if at the end of the day you need example: 10 mm t that is including design MAWP + Corr. allow., you will have no choice but to add any mfr under-tol that you can think of to make up for the thin-out,

genb

 

[panduru]

Thank you, ccplnkr, for the valuable post.
.