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[MW:25386] Re: Welding

By Materials & Welding

ASME B31.1 / 131.6
(A) A minimum of at least % in. (10 mm) thickness
of weld is deposited or 25% of the welding groove is
filled, whichever is less (the weldment shall be sufficiently
supported to prevent overstressing the weld if
the weldment is to be moved or otherwise loaded). Caution
is advised that the surface condition prior to cooling
should be smooth and free of sharp discontinuities.
(B) For P-Nos. 3, 4, and SA materials (with a chromium
content of 3.0% maximum), the weld is allowed
to cool slowly to room temperature.
(C) For P-No. 5B (with a chromium content greater
than 3.0%), P-No. 6, and P-No. 1SE materials, the weld
is subjected to an adequate intermediate heat treatment
with a controlled rate of cooling. The preheat temperature
may be reduced to 200°F (95°C) (minimum) for
the purpose of root examination without performing an
intermediate heat treatment.
(D) After cooling and before welding is resumed,
visual examination of the weld shall be performed to
assure that no cracks have formed.
(E) Required preheat shall be applied before welding
is resumed.

On Saturday, August 20, 2016 at 2:16:41 AM UTC, richard burthon wrote:
Dear All,

Could  welding to be continued tomorrow but WPS/PQR is qualified without overnight,,?please give me any reference for this case

regards

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