Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. ndeguy

    Manual UT on special bevel (like K-bevel)

    The 3,5mm (10/2 - 3/2) of land either side of the root bevel on the lower face (in the diagram) may be difficult to achieve good fusion. As is often the case, if it presents a challenge to the welder, then it will present a challenge to the UT tech as well. Of course if the very best welders and...
  2. ndeguy

    Manual UT on special bevel (like K-bevel)

    With the uneven weld prep and the lower part with 10mm of land, I think the 1st question is can it be reliably welded with complete penetration and fusion?
  3. ndeguy

    Recommended NDT for detection failures in Tube to tubesheet joints

    Typical demonstration of quality for tube-tubesheet welds is to perform test pieces in the same manner and then section them. Problem with NDT on production welds is access (and cost). Have you a problem with leaks?
  4. ndeguy

    Feild Weld rejection %

    Wow, Oil & Gas a welder MAY be fired if he has 3 repairs IN A SHIFT!
  5. ndeguy

    Missed edge detected on final visual inspection BEFORE AUT - how to proceed iaw DNV-OS-F101

    Hi Scott " ...able to get through BINDT titled Magnetic particle inspection of precipitation hardening type steels written by C R Preston. It was originally published December of 2002 in Vol. 44 No. 12 of Insight." Where are you based? Have you tried to obtain a copy from BINDT, Northampton...
  6. ndeguy

    RT for welding pipe to flange

    Slip-on flange should not require RT or UT because of the geometry being unfavourable to both. Surface crack detection (MPI for carbon steel, penetrant for stainless) shouls suffice.
  7. ndeguy

    Hardness Test

    Please take the sage advice of metengr and have the parts tested professionally by a nationally-approved test house which has the right personnel, equipment and approvals. Both Rockwell and Vickeers will leave macro surface indentations. Equotip (or some similar comparable equipment) should...
  8. ndeguy

    Hardness Test

    Your first post refers to welded parts. What size and shape are they? What equipment do you have and is it portable or fixed? The advantages of the 2 systems I mentioned are they are both portable and both widely recognized hardness test equipment. I concur with metengr, you need qualified...
  9. ndeguy

    Hardness Test

    For weld traverses this is often done with a Poldi www.casteelnoble.com/poldi.html For thinner materials: www.equotip.com‎
  10. ndeguy

    Missed edge detected on final visual inspection BEFORE AUT - how to proceed iaw DNV-OS-F101

    http://www.ndt.net/article/0498/ginz_wel/fig1028b.gif On this diagram (of a compound weld) there is a clear difference between what I term missed edge (LFS cap) and undercut (U/c Cap). I am an NDE guy but not a welding engineer but I believe the former has a different cause than the latter, and...
  11. ndeguy

    Missed edge detected on final visual inspection BEFORE AUT - how to proceed iaw DNV-OS-F101

    In this specific case and my general parlance, where the capping run adjacent to the parent material has left a small (circa 10mm long) unfilled zone with the weld bevel. Instead of an even geometry pass, at this one point the bead narrows and doesn't even reach the bevel. Hope this explains -...
  12. ndeguy

    Missed edge detected on final visual inspection BEFORE AUT - how to proceed iaw DNV-OS-F101

    In such case is a repair called and then proceed as per the repair procedure (and added to the repair rate) or is the repair welder authorized to grind open the missed edge, MPI and then manually fill out, followed by a pull of the line so that weld is in the AUT bay and the touch-up/weld repair...
  13. ndeguy

    IQI Material

    QC7 "Fe" denotes the wires used are of low carbon steel, "SS" that the wires are of stainless steel (CrNi). These materials have different radiation absorption characteristics. You write that they "...are in the same group" What do you mean, from where do you take your information? Make a...
  14. ndeguy

    Lack of Fusion after galvanization

    demsha Your post heading "LOF after galvanisation" is erroneous if NDT (UT and MPI) was suitable prior to galvanisation. If items were proven to be defect-free prior to galvanisation then I suggest that metengr and gtaw are likely correct and these are not LOF defects. Of course there is...
  15. ndeguy

    The relationship between charpy impact energy and charpy lateral expansion

    http://www.twi.co.uk/technical-knowledge/faqs/structural-integrity-faqs/faq-what-is-the-relationship-between-charpy-impact-energy-and-charpy-lateral-expansion-for-ferritic-steels/ this gives an empirical relationship and a graph between impact value and lateral expansion
  16. ndeguy

    Can We Perform UT At 50% Completed Weld?

    What's the form of the component - unlikely to be pipe at 50mm wall thickness. So if there is access to the root face and you have let the joint cool down, then visual inspect to check for lack of penetration/root condition followed by MPI for any lack of fusion. follow this by manual UT from...
  17. ndeguy

    Ethylene furnace convection

    Googling brought this response from the Hendix Group website (always informative): "Depending on the configuration of the finned tubes, you might consider boroscope inspection. Ultrasonic wall thickness (IRIS) inspection may also be a possibility, depending on the diameter of the tubes. Finned...
  18. ndeguy

    what is the correct procedure for UT examination of 1.5 inch pipe weld

    tigwired 1st as both unclesyd and JR97 point out all welds requiring full UT should be examined by a comprehensive inspection plan designed with critical areas in mind (sidewall, root, toes of weld cap and HAZ) as well as a general examination of the body of the weld. This demands the use of...
  19. ndeguy

    UT test for inspecting a vessel with plates in SS clad +CS

    lganga What is your acceptance criteria? If your deposited weld metal is ferritic and 30mm thick then perhaps you should investigate TOFD. The 3mm 316 cladding should not interfere significantly. If you apply ToFD ensure your techncian makes full allowance for the cap width (his examination...
  20. ndeguy

    Deleterious effects of weld root excess penetration

    Sorry members, but the search function is malfunctioning when I tried to search for any previous threads on this topic. Does excess weld root penetration lead to life-shortening of process pipework through turbulent flow conditions? Has this been studied and recorded? I am looking at the...

Part and Inventory Search

Back
Top