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  • Users: HgTX
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  1. HgTX

    Duane Miller on being cautious about seal welds

    http://www.jflf.org/pdfs/papers/design_file6.pdf My main takeaway: a seal weld doesn't know it's a seal weld, and if it's undersized or of poor quality, it can cause trouble. But Duane says it better than I would. Have a read. Hg
  2. HgTX

    Cross-Frame Design Questions!!!

    To continue the tangent, I may be misremembering, but I thought there was recent talk within AASHTO circles of setting out some limits of "normal" overhang bracket configurations that wouldn't require special analysis, and requiring it for others. (But still not putting it on the designer. But...
  3. HgTX

    "E7018": a rant to designers.

    Does "not exactly high traffic" also mean low readership? I'd put this stuff in the welding code fora except the people who most need to see it are the least likely to be subscribed to those. Seal welds are another rant entirely, though there is a published rant by the esteemed Duane Miller of...
  4. HgTX

    "E7018": a rant to designers.

    SAW is the most common for machine welding, though FCAW & metal-cored GMAW also happen. Your link is a good one--it shows examples of different classifications for different welding processes and how they differ. Weld all around really means weld all around, no stopping at corners (and...
  5. HgTX

    Cross-Frame Design Questions!!!

    I agree; there should always be positive connection at the top and bottom of any connection plates, or else you are risking failure in the web due to out-of-plane bending. I advise welding and handling whatever fatigue detail there may be (is that even a concern at the bearing?), rather than...
  6. HgTX

    Stupid Construction Questions

    The tendency that I've seen with regard to bridge shop drawing review is that someone from the EOR's firm (whether that's the agency or an outside consultant) reviews the shop drawings. This review may be quite cursory or they may go at it like a detailing checker. State budgets are such that...
  7. HgTX

    "E7018": a rant to designers.

    I'm so glad no one has been grumpy about it so far. Anyone wanna hear my "weld all-around symbol" rant? Hg
  8. HgTX

    "E7018": a rant to designers.

    "You keep using that word. I do not think it means what you think it means." (Princess Bride) I am posting this in this particular forum because bridge welding is more likely than structural welding to have long machine welds. Almost every set of plans I see requires E70XX or E7018...
  9. HgTX

    ASME BPVC Section IX QW-452.3, large diameter

    Transition rather than diameter is helpful, thanks. Hg
  10. HgTX

    ASME BPVC Section IX QW-452.3, large diameter

    There's what's more or less implied by common sense, and there's what the code actually says. What QW-461.9 says is that if your production piece has diameter over 24", you have the option of treating it as plate with regard to who's qualified to weld it. But it doesn't go the other way. It...
  11. HgTX

    ASME BPVC Section IX QW-452.3, large diameter

    As I read QW-452.3, ANY pipe over NPS 2-1/2 qualifies for diameter down to NPS 2-1/2. Which means, in theory, someone could weld pipe with 6 ft diameter and qualify to weld 3" diameter. They'd be a long time welding, but it looks like it would be legal. At what point does pipe become plate...
  12. HgTX

    SSPC vs NACE Inspection Certifications

    Please report back on whether you think BCI is worth it on top of NACE! Thanks! HgTX
  13. HgTX

    accounting for workers' presence in design?

    I have a vague recollection of some design provision that included a 300-lb. load at 12" eccentricity to account for a worker that might be hanging off the structure during the member's installation. I was pretty sure that this was somewhere in AISC 360 but that would appear not to be the case...
  14. HgTX

    Section IX supplemental variables

    I'm hearing that on recent projects, a Major Engineering Firm requested that CVN testing be added, and even they didn't invoke the supplementals for thickness & HI. Is this really something that engineers tend not to know about? Or have my contacts just been travelling in the wrong circles of...
  15. HgTX

    Section IX supplemental variables

    Need a sanity check. QW-251.2 appears to say that the supplementals (e.g., additional restrictions on minimum thickness & maximum heat input) kick in automatically whenever Charpies are required. We have WPS/PQR provided by a sub. They have Charpies, but don't seem to have worried about the...
  16. HgTX

    Why did you decide to become an engineer?

    Never had any Dilbertian "knack". But we did a unit on "structures" in school when I was 9, building things from straight pins and soda straws. (Straight pins are probably not permitted in elementary schools any more.) My structure held up the most weight hung from it. Then we were asked to...
  17. HgTX

    turn of the nut for A449 bolts?

    They're the same strength, but I believe a different thread configuration, which would change the turns. I can't really back-calculate it, since the A325 turn requirements are lumped and simplified. Hg Eng-Tips policies: faq731-376
  18. HgTX

    turn of the nut for A449 bolts?

    Are there published recommendations/requirements for installing A449 bolts by the turn-of-the-nut method? RCSC only covers A325 & A490. Hg Eng-Tips policies: faq731-376
  19. HgTX

    weldable 105-ksi rod?

    I'm thinkin' no such thing, but I might as well ask. But rather than presuppose a solution, let me describe the full problem. U-bolt. ASTM F1774 Gr. 105. Code limits the depth of the "U" and the diameter of the bolt. U-bolt goes through several plies of steel and has bolts on both sides of...
  20. HgTX

    Ultrasonic Weld Testing vs. Radiographic Weld Testing

    Phased array easily provides a volumetric record for specific locations, to show the kind of indication you're looking at. Depending on the application (I haven't seen a setup that would work for pipe but I'm no expert) there is also a tracker wheel type setup that lets one continuously record...

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