Minimum thickness is 6mm.
QW-403.6 says “. . . where T is less than 6mm, the minimum thickness qualified is 1/2T . . .” . Since your thickness is not less than the general rule of T to 2T applies.
Note this wording has also given me heart burn. What I have done is to take a 1/4 inch plate (nominally 6mm) and have the thickness machined to 0.249 inches, this then qualifies for thickness 0.124 to 0.499 inches. If I need the thickness I will also weld a 1/2 inch thick plate to qualify 1/2 to 1 inch.
John A. Henning
Welding & Materials
What shall be the minm. qualified thk. range if PQR is qualified with 6 mm. Nom. thk. with Notch toughness properties. Will it be 3 mm. or 6 mm. as per QW-403.6 of ASME Sec. IX?
Further, suppose If I shall qualify this procedure on 5 mm. thk. PQR test coupon (machined from 6 mm. thk.), which thickness shall I have to consider for temperature reduction during subsize test specimen testing? Will it be 5 mm.(actual thk.) or 6 mm. (nom. thk.)?
Awaiting your experts' opinion at the earliest.
Thanks & regards,
C. R. GANDHI
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