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Recent content by WeldUK

  1. WeldUK

    PWHT of thin 2.25Cr-1Mo parts

    Thanks guys, this is very useful. Hardness max 350HV so we should be fine.
  2. WeldUK

    PWHT of thin 2.25Cr-1Mo parts

    Hi all, I have come across a spec that requires PWHT based on material grades (P-Nos), regardless of thickness. This is likely to give distortion problems when welding thin components (1/8in or similar) made of F22. On the other hand, we risk failing the hardness test, if we try to qualify...
  3. WeldUK

    9cr Bakeout

    I agree with the other replies. For steels with a Cr content greater than 9%, failures due to stress corrosion cracking have been reported for as-welded components waiting to be postweld heat treated after welding (even if no load was applied!). However, if PWHT will be immediately carried out...
  4. WeldUK

    Calculating Minimum Pressurizing Temperature

    I have been asked for information on how to calculate the MPT (Minimum Pressurizing Temperature) for a hydrocracker heat exchanger. Can anyone suggest provide an ASME B&PV reference or any other relevant standards or publications? A design report I got hold of references a conference paper...
  5. WeldUK

    PQR and WPS software

    Albaweld, I agree with the earlier posts, developing your own template and actually reading the codes/standards is 'free' and it is the best way to learn your way around them. Software programmes will not replace an individual's knowledge and most of all they will not 'write a WPS for you'...
  6. WeldUK

    T23: purging required?

    Thanks Metengr, one of the publications I quoted was actually the EPRI Guideline (my CSEF bible). I have the 2007 version though (the one that was downloadable for free!). The welds are being made for R&D purposes, so I will purge as I would not like root defects to influence the test results.
  7. WeldUK

    T23: purging required?

    I am preparing some welding procedures for T23 tubes (7 to 15mm thick). This grade is a first time for us, although we have welded low-alloy grades before (91 and 92). Is back-purging required for root runs in T23? I have found publications that recommend purging root runs for any low-alloy...
  8. WeldUK

    AISI 410S to 1.4313 (aka X3CrNiMo 13-4, S41500)

    Thanks everyone for the advice, I am in your same position, no details whatsoever on the service conditions but still asked to provide an answer!
  9. WeldUK

    AISI 410S to 1.4313 (aka X3CrNiMo 13-4, S41500)

    Can anyone recommend a consumable grade?
  10. WeldUK

    Any standards re distortion in piping?

    Thanks BigInch, I have come across the second document. They are useful but still do not answer my question, as what I refer to is distortion due to solidification shrinkage during welding. The 'distortion' mentioned in the second link (and also in B31.3, 335.1.1(a)) refers to deformation of...
  11. WeldUK

    Any standards re distortion in piping?

    Thanks BigInch, I forgot to specify that I am after requirements on weld distortion. My bad!
  12. WeldUK

    Any standards re distortion in piping?

    Hi everyone, I am looking for an international standard that provides requirements regarding acceptable distortion in piping (B31.3 does not). Can anyone help?
  13. WeldUK

    Estimate the cost of preheating

    Sorry metengr. I coudl nto find a way to cross-reference. Next time I'll try one forum only
  14. WeldUK

    Welding - cost of preheating

    Thanks metengr, I am trying to work out costs for those shops that carry out preheat and PWHT directly, without subcontracting. I have split between flame and resistance and I have calculated the cost of gas/electricity, but labour depends on too many factors (especially for blanket heating.)...
  15. WeldUK

    Welding - cost of preheating

    Dear All, I am a welding engineer working on a spreadsheet to estimate fabrication cost. Whilst the cost of welding alone is 'relatively easy' to estimate (considering duty cycles, labour costs, equipment depreciation etc), I am struggling with the cost of preheating. I have found formulas in...
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