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Recent content by QC1971

  1. QC1971

    ASTM A536 70-50-05

    I have read A536 numerous times and this morning I set down and read it again and I may have found my answer. 4.1 states that "the iron represented by the test specimens shall conform to the requirements as to tensile properties presented in tables 1 and 2". What do you guys think?
  2. QC1971

    ASTM A536 70-50-05

    I understand that materials can have different properties due to variations in their thermal treatments. The issue is that A536 classifies materials based on their mechanical properties, it allows for cast on samples or seperately cast samples but the same property values apply to both samples...
  3. QC1971

    ASTM A536 70-50-05

    I have a question regarding the mechanical testing results for A536 70-50-05 material. I have a supplier who does both seperate and cast on samples however their acceptance criteria for cast on samples is significantly lower than what A536 specifies for 70-50-05. Where A536 calls for a tensile...
  4. QC1971

    Socket Weld Interpretation

    I think that you will find that ASME does not establish an acceptance criteria for NDE results that are not mandated by code, it is a matter of agreement between the owner and fabricator.
  5. QC1971

    ASME IX PQR

    REGRUMBLE, I do not think the backing would be an issue as it is not an essential variable for Procedure Qualification of SMAW. It would however be an essential variable for the Welder Performance Qualification and should be concidered when writing the WPS and qualifying the welders. I may be...
  6. QC1971

    Seamless pipe ripples.

    I guess one could argue that they are mechanical marks and that it is not a workmanlike finish as described in para. 18 of A106 but you may not get very far with it.
  7. QC1971

    socket weld maximum gap

    31.3 says APPROX. 1.5mm gap PRIOR to welding. The gap after welding can vary depending on many variables. Welding process, how many tacks were used, size of the weld ect. When socket weld RT is required by our clients I have them specify the acceptance criteria since the code only addresses it...
  8. QC1971

    Is this tempered martensite?

    So how would you explain the tempering? It seems to me like there had to be another heat treatment performed on this material to temper the martensite since martensite would not form until it was below the tempering temperature for the material.
  9. QC1971

    Is this tempered martensite?

    Can someone help me understand where the tempering of the martensite would occur. If it was bent at 1050C and water quenched this would be essentially a normalizing treatment. The material should have fully austenized at that temperature and formed fresh untempered martensite upon cooling correct?
  10. QC1971

    Nozzle tie in welds

    Metengr, Thanks for the clarification. It has been about 10 years since I have had to deal with Section VIII. After re-reading it I think you are correct. To clarify the question gr2vessels, a Section VIII vessel is delivered to the jobsite and installed by the onsite contractor who is not...
  11. QC1971

    Understanding of ASME Code

    I would say the PQR will support a WPS that will permit welding of this joint. The welder would need to qualify on a test coupon at least 7.5mm thick with an O.D. less than 2 7/8". This would allow the welder to deposit 15mm of weld and the welder would be qualified for materials down to 1" O.D.
  12. QC1971

    Nozzle tie in welds

    Per section VIII Div 1 the first circumfrential joint falls under section VIII's juristiction. Is there any documentation required from the installer that makes the tie in welds similar to the U-1? Would making these welds be considered field assembly and need to be documented on the applicable...
  13. QC1971

    Tack Welding Structural Nuts

    Why not attach them with an adhesive or epoxy? More than enough strength to hold the nut in place but would yeild much sooner than the steel.
  14. QC1971

    Hardness Testing

    Thank you Stanweld
  15. QC1971

    Hardness Testing

    When I have used the telebrineller with the correct bar I can get results that are consistent with my results with a Mic 10 and Mic 20. The problem is that I no longer perform testing or I would do some comparitive testing to answer my question. My problem is that I have a wide acceptance range...
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