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[MW:35959] ASME Sec III NB, Impact test thickness clarification

By Materials & Welding

Dear Experts,

 

I have a question related to Clause NB-4335.1 & NB-4335.2 from ASME Sec III Subsection NB.

 

NB-4335.1 Impact Tests of Weld Metal.

(a) Impact tests of the weld metal shall be required for

welding procedure qualification tests for production weld

joints exceeding 5∕8 in. (16 mm) in thickness when the weld

will be made on the surface or penetrate base material that

requires impact testing in accordance with NB-2310.

 

NB-4335.2 Impact Tests of Heat-Affected Zone.

(a) Charpy V-notch tests of the heat-affected zone of the

welding procedure qualification test assembly are

required whenever the thickness of the weld exceeds

5∕8 in. (16 mm) and either of the base materials

require impact testing in accordance with the rules of

NB-2310.

 

*I want to know your opinion if the above clauses are applicable to fillet welds.

 

Also to note that Clause NB-4622.3 (Definition of Nominal thickness governing PWHT) states, "For fillet welds the nominal thickness is the throat thickness".

I would like to know whether this definition of nominal thickness for fillet welds to be applied when interpreting the thickness requirements in NB‑4335.1 and NB‑4335.2.

 

Kindly provide your thoughts. Thanks in Advance.


Ruban Stanley.

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