Welding

[richard burthon]

Dear All,

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

regards

[Perumal Govindan]

Hi

Based on my experience for tank fabrication, the next day welding will be allowed, for piping and pipeline if it is higher thickness/nig bore line pipes/non sour will be allowed after competition of 70% welding and the same will be discussed with Client for acceptance prior to implementation.

For sour service piping and pipeline delayed will not be permitted, delayed PQR will be conducted for demonstration/destructive testing. Please note that there will be an additonal NDT methods will be carried out on the production welds for Clent acceptance.

With kind regards
Govindan Perumal

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[Mac Palola]

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.