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Recent content by Weldmedic

  1. Weldmedic

    Back gouging after 1 run

    Well stated Al. Steve Steve Dodd
  2. Weldmedic

    recurrent steam boiler fire tube failure

    Just a thought here... Your description of the seal weld followed by grinding flush with the weld. It would seem that perhaps there may be instances where the is excess removal of the fillet weld attaching the tube to tube sheet. Perhaps a better method would be to flush grind or machine the...
  3. Weldmedic

    MPI or Penetrant dye for ASME VIII

    MPI and penetrant examination are interchangable on ferromagnetic alloys. Penetrant inspection would be indicated where a magnetic field could not be induced into the part. Steve
  4. Weldmedic

    Urgent TIP on torispherical head to be transported into two halves

    Heads like this are usually fabricated in halves, not totally welded. During the forming process the individual plate section geometry is usually verified with sweeps and templates. During fitup and assembly, bracing is used to maintain configuration for fabrication, inspection and shipping.It...
  5. Weldmedic

    PWHT Portable Machines

    Try Mannings USA. I think they are in NJ and can provide anything you would require...lease or purchase. However for ease of use I would look hard at the Miller Proheat 35 induction unit if you are doing piping.
  6. Weldmedic

    Plumb deviation for a 50m steel chimney

    The last stucture like this that I was involved with had a max of 4" overall out of plumbness required. See Asme STS-1 code for Stacks. Steve
  7. Weldmedic

    bolt and nut fasteners thread engagement

    While many specs require flush with the face of the nut, this will not provide full engagment with the threads. Examining the leading end of the bolt or stud reveals a partial starting thread. In order for there to be full engagement a full thread crossection must exist for there to be full...
  8. Weldmedic

    Welding Symbol (Finish symbol)

    PERHAPS YOU ARE REFERRING TO THE MELT THROUGH SYMBOL. This will appear on the opposite side of the reference line from the bevel and is shown as radiused arc (filled) at the base of the groove signifying that the desired weld provides Complete joint penetration made from one side. If the symbol...
  9. Weldmedic

    price impact estimate - Head THK.

    I echo JStephens advice. A good rule of thumb is the price per pound. Other things to consider are the current surcharges on steel. Perhaps the fabricator has it in stock and can give you a better price. If your changing horses here and have one on order and need to change, get up with the...
  10. Weldmedic

    PWHT, NDT and HT

    I suspect HT means hardness test. Typically PWHT, MPI And NDE then HT. Volumetric NDE prior to PWHT can be done to substantiate the quality of the weld prior to heat treatment however usually you want to complete PWHT prior to NDE and hardness testing. MPI on the other hand will cover all arc...
  11. Weldmedic

    Welding galvanized carbon steel

    Another method to restore the galvanizing are zinc alloy solder bars that can be wiped over the heated surface of the welds to hot coat exposed steel surfaces. I have used this method on hot dipped galvanized handrails where changes were made in the shop or field. I believe they are called...
  12. Weldmedic

    Weld gas mixer / manifold system

    RD, I have to echo the others when it comes to gases.Bulk systems are ok when it comes to ArCO2 mixtures. Personaly unless you have a call for it stick to pint of use tanks. The unusual jobs are few and far between. One point here, BEFORE you establish your shop investigate the cost of...
  13. Weldmedic

    GMAW

    Many specs in the past have restricted GMAW to .250 thickness and less assuming that the metal transfer would be short circuiting mode.Welding heavier section thicknesses in this mode may increase the possibility of fusion problems. This concept has carried on despite advances in electrodes...
  14. Weldmedic

    Welding Certifications and Testing

    I have to agree with GR this cost is way out there. I work with other defense contractors who perform the same type of welding and there is no where near the cost you describe. I have a feeling your on the right track here with wanting to integrate this internally or maybe you need a different...
  15. Weldmedic

    WPS vs. PQR

    A PQR proves that a specific combination of alloys can be sucessfully joined by a specific process or processes with a documented set of variables. The WPS must be backed up by the PQR(s) PQR can be welded on any form of material Plate or pipe as long as testing coupons can be cut. Our plates...
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