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  1. dhengr

    Increasing Reaction Capacity

    Dik: Yes, you can usually increase the size of a fillet weld by adding few more passes. You should obviously use compatible filler metal and welding process. You should know something about the existing materials to make that compatibility determination. Is the (a specific) weld the limiting...
  2. dhengr

    AS1554.1 - Welding of Structures - Section 7 - Error found

    I’ve always hired blind welders and welding supervisors, because I couldn’t trust them not to look at their work and finished products. They do complain a lot about burnt fingers as they try to feel for their work, but that’s a small price to pay when it comes to the potential of violating...
  3. dhengr

    The Pitch of an Intermittent Weld

    Jerry1423: Why not a note like: “At a closure btwn. two runs of welds, use three or four equal (but slightly smaller) spaces (smaller pitch lengths) and the same prescribed length of weld for the final few closure welds.” Good welders will almost always make their welds slightly larger than...
  4. dhengr

    Alignment of Welded Column connection

    Gvot: The fillet welds btwn. a stl. col. and a base pl. are really not intended to be the primary vert./col. load transfer mechanism. They do take moments, shears, and of course, some of the compressive load too. Within the fab. and erection tolerances columns are intended to transfer their...
  5. dhengr

    ST Welded Connections - Did Anyone Know This?

    Norby_acn: I have seen some specialty tees which do have a tapered web (stem), but I don’t think this is one of them. That ST 5x17.5 is cut from a std. beam, an S 10x35; and it does not have a web which changes thickness. It does have flgs. which taper to about ¼ or 5/16” at their tips and...
  6. dhengr

    What defection of pipe weld.

    He misspelled ‘defecation’ in the OP title, but that is certainly what those welds look like.
  7. dhengr

    Ceramic backing factories?

    Kingnero: Google ‘ceramic welding backing,’ there are a bunch of suppliers and manufacturers.
  8. dhengr

    CTE for weld metal?

    MintJulep: I thought you meant stresses caused by the welding, but now I think you might actually mean the stresses in the weld, or welds, due to the various loads. I can certainly imagine a situation like you are describing, but would need a lot more details to really comment more...
  9. dhengr

    CTE for weld metal?

    MintJulep: Your last para., “It is possible that there were welding stresses imparted that were just under yield. And that loads applied during shipping pushed things beyond yield.” may be true in a few cases, but generally it is completely bass-acwards. There is yielded material around all...
  10. dhengr

    CTE for weld metal?

    Althalus: Weldstan is right on the money. You always get some distortion from welding. If you put a flange plate down and weld a vert. standing web to it, fillet welds both sides of the web to the flange, making a ‘tee’ section, the entire section will end up cambered upward, touching the...
  11. dhengr

    Peeling Force Calculation

    SSergey: You have asked the right question for your particular cross sectional detail, but your detail is really a poor detail for your particular application. Put dimensions, thicknesses, member lengths, min. backspan length on outer member, loads and other pertinent engineering detail info on...
  12. dhengr

    Preload in bolt used in weaker tapped hole

    SiggiN: The previous three posts are really good and informative posts, if you read them thoroughly, carefully, maybe between the lines a bit. Desertfox’s two refs. are very good also. They are mostly just good common sense, engineering thinking and reasoning to solve a problem. You probably...
  13. dhengr

    When screw is subject to shear load with the shim between the joint

    Jsu0512: You have .25kN (56lbs.) of lateral loading out near the head of the screw, applied through the .25” bracket pl. The screw hole in that bracket pl. should be pre-drilled slightly oversized, so that the screw can not bottom out btwn. the screw head and any thread that it has made in that...
  14. dhengr

    Precast Sandwich Panel - Adhesive Anchor Repair

    JReck: I would insist on the precaster verifying the thickness conditions, so you know what you are designing around. I would go by the detail until told otherwise, (or just guess at everything?). I would also want him to locate all of the vert. rebars, so I can miss them too, as much as...
  15. dhengr

    True ultimate strength of welds

    JAE: Both the base metal and the welding material MTR’s will show some min. yield and tensile strengths, and the actual value can vary above that level, and be within spec. I would talk with the welding rod supplier to see if they can’t fine tune their values for you. Alternatively, what does...
  16. dhengr

    Secondary Containment Options for Pre-Existing Flat Concrete Floor

    The1falconer: Pay particular attention to people and equipment traffic and how this curb might be abused and damaged by any activities near it. At this stage, I think the angle iron idea will probably work best. Put the horiz. leg, with anchors, on the conc. slab to the inside to minimize...
  17. dhengr

    Thermal Stresses in Welded Fabrications

    PhamENG: You must be boiling one hell of a bunch of water, fairly quickly…, making a lot of steam. And, that is your cooling mechanism, your heat dissipating mechanism. But, of course, the steel pl. and baffles are acting as heat transfer medium/materials, with large differences in temp...
  18. dhengr

    true cost of intermittent welds

    Tmoose: Gtaw and PhamENG are right on the money. Now, if the shop is working under a serious structural environment with serious inspections, the difference becomes even greater. There is the weld layout time and inspection time. The welds are invariably laid out a little longer so there is...
  19. dhengr

    Cold Forming Countersunk Holes

    Bduff: Like 3DDave, I don’t understand why you need a countersink detail for a ¾” bolt on a hole in a ¾” pl. either. You could probably do what you are trying to do, if you heated the plate sufficiently and provided some forming pressure on the edge of the pl. in the immediate area of the hole...
  20. dhengr

    Washer to fill a countersink?

    Mr168: Why not braze the hole full, or some such, then drill it open again to the right dia. Why not drill it open to a slightly larger dia. and use a larger screw for your new fixings. The only issue should be that you provide some bearing area (bearing dia.) for the screw near the faying...

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