PWHT
PWHT
(OP)
Section 331.1.3 in B31.3 talks about governing weld thicknesses for branch connections and fillet welds at slip-on and socket welding flanges and piping connections. I find this confusing. Could someone explain it in plain english? Thank you.





RE: PWHT
Basic requirements - in a weld joint the thicker of the two materials being joined determines PWHT with exceptions based on joint type and base materials;
(a) For branch connections you are comparing the thickness through the weld in any plane to material thickness to determine PWHT requirements.
(b) For fillet welds at slip on flange and socket welding fittings you are comparing the thickness through the weld in any plane to determine if it is twice as great as the material thickness for specific base materials.
RE: PWHT
RE: PWHT
Thickness will determine time of PWHT.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: PWHT
Don't forget P1 materials where thickness will determine whether PWHT is required or not,
Hemant65,
Do you mean branch 20 mm thick and header 40 mm thick ?
Regards,
Kiwi
RE: PWHT
RE: PWHT
RE: PWHT
Design Code is ASME B31.3
Material of branch: A516 Gr.70, Thickness of Branch: 40mm
Material of Header: A516 Gr.70, Thickness of Header: 20mm
Now could you please let me know that PWHT is required?
RE: PWHT
See Table 331.1.1
RE: PWHT
What about as per 331.1.3 (a)?
RE: PWHT
See below...
Heat treatment is required,
however, when the thickness through the weld in any
plane through the branch is greater than twice the minimum
material thickness requiring heat treatment, even
though the thickness of the components at the joint is
less than the minimum thickness.
RE: PWHT
RE: PWHT
RE: PWHT
Would it not be classed as a groove weld and require PWHT based on being greater than 20 mm wall thickness as you stated in an earlier posting ?
Regards,
Kiwi