control thickness pwht asme b31.3

[JohnPeter1]

Dear expert,kindly need explain what actually mean control thickness in B31.3 paragraph
331.1.3 Definition of Thicknesses Governing PWHT
(a) The term control thickness as used in Tables
331.1.1-1 and 331.1.3-1 is the lesser of
(1) the thickness of the weld
(2) the thickness of the materials being joined at the
weld or the thickness of the pressure-containing material
if the weld is attaching a nonpressure-containing material
to a pressure-containing material.
(b) Thickness of the weld, which is a factor in determining
the control thickness, is defined as follows:
(1) groove welds (girth and longitudinal) — the
thicker of the two abutting ends after weld preparation,
including I.D. machining
(2) fillet welds — the throat thickness of the weld
(3) partial penetration welds — the depth of the
weld groove
(4) material repair welds — the depth of the cavity to
be repaired
(5) branch welds — the dimension existing in the

 

[EdStainless]

so?

 

[JohnPeter1]

Hello sir
are control thickness is thickness of material or thickness of weld with reinforcement,
thank you

 

[SWComposites]

is the lesser of ....