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  1. Jovi Zhu

    PWHT

    As my opinion in my previuos post: It may be wise to use a PQR with a short holding time meeting the minimum Table USC-56-1 requirement, together with that "300 minutes" PQR, to prepare a WPS specifying a short but enough time, i.e. 60 minutes as a minimum for your case with a note/remark...
  2. Jovi Zhu

    PWHT

    Weldstan, I share the same understanding and my "latest" EPRI Carbon Steel Handbook 2007 still reads "The ASME Post Construction Committee is generating guides on repair techniques (not yet published as of this writing)." There would be still years ahead before my retirement but I have...
  3. Jovi Zhu

    PWHT

    There should be a repair procedure giving specific requirement taking precedence over the original WPS for a localized weld repair as for such case not all the variables of the original WPS can be kept such as the joint configuration. A mock-up is sometimes deemed necessary beyond the minimum...
  4. Jovi Zhu

    PWHT

    Weldstan, thanks and yes for those cases defective welds and HAZ are completly removed and the WPS is used to make "new" joints for the repair. For repair of partly defective welds after defect removal when new welds need to be made on exsting weld beads, I'm thinking twice and trying to figure...
  5. Jovi Zhu

    PWHT

    Ani18, My appology for my post saying "If nothch toughness is not applicable" as I was revewing another post at the same time on this forum for Section I topic without impact test issue and I partly mistook your post with it. Now it is clear that QW-407.2 is applicable for your case as a...
  6. Jovi Zhu

    PWHT

    For P No.1, Section VIII-1, Table USC-56-1 requires for thickness "up to 2 in. (50 mm)", "1 hr/in. (25 mm), 15 min minimum". This should be simply interpreted as: For thk < 1"(25mm), go with 15 minutes as a minimum; For thk = 1"(25mm), go with 1 hr(60 minutes) as a minimum; For thk > 1"(25mm)...
  7. Jovi Zhu

    PWHT

    It must be a typo as I can hardly imagine a 300+ minutes (5+ hours) holding time for 22mm thk carbon steel. It would be more reasonable that the PQR was done with a 30.0 miniutes holding time and the WPS specifies 37.5 minutes. The welding engineer who approved the WPS should be able to explain...
  8. Jovi Zhu

    Cobining WPS

    Code tells yes or no but not always why. For this case I'm thinking about if the upper and lower thickness limits can be linked to heat input range influencing the mechanical property and hence the ablility of the specific joint to pass the qualification test. Heat input introduced should be by...
  9. Jovi Zhu

    Expected hardness after welding/pwht carbon steel

    I've been working on Section I pressure parts and experienced the similiar customer requirement. It will be good to communicate with the client that the purpose of the hardness test for welds is to verify the proper heat treatment is done. Section I never requires this and I remember B31.3-2012...

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