I wish to know that welding on pipe surface is possible after PWHT. i.e a notch, grind mark of below 5mm. Is it possible to do welding without PWHT after the weld.
As per ASME B31.1 TABLE 132
GENERAL NOTE:
(A) PWHT is not mandatory for P-No. 4 material under the following conditions:
(1) welds in pipe or attachment welds to pipe complying with all of the following conditions:
(A) a nominal material thickness of 1⁄2 in. (13.0 mm) or less;
(B) a specified carbon content of the material to be welded of 0.15% or less;
(C) application of 250°F (120°C) minimum preheat during welding.
Shall we use this note to do weld on pipe which is completed PWHT.
Welding on Pipe Surface After PWHT
