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  • Users: CWEng
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  1. CWEng

    CVN test at Weld Metal with ER70S-6

    Hah- your right on that one. For some reason I had the ASTM figure for pipe seam weld CVNs stuck in my head late at night. I think the other points are still valid though, even though my mental orientation was wrong.
  2. CWEng

    CVN test at Weld Metal with ER70S-6

    Some of your initial post does not make sense. How are you getting full size 10x10mm charpy from a 6" x 11mm wall pipe? The curvature of the pipe would prevent that. Also, is the entire PQR pipe coupon welded with ER70S-6 GTAW? You mention you are qualifying GTAW/SMAW. In addition to other...
  3. CWEng

    Welding Rimming Steel

    Self shielded flux cored wires (i.e. innershield) typically contain high amounts of aluminum to counteract the expected atmospheric contamination from oxygen that occurs during the welding process. I'm not sure if they contain enough aluminum to also counteract high oxygen from the base metal...
  4. CWEng

    Effect of post-weld heat treatment on mechanical properties

    1) In general, PWHT tempers the weld metal and HAZ that has formed martensite on high strength low alloy weld metals from fast cooling, while also relieving residual stresses. Both tempering and stress relief can be beneficial, but tempered martensite is not as strong as untempered martensite...
  5. CWEng

    Table UG-84.6 Required HAZ Impact Test Specimen Set Removal

    1) Yes 2) If you thought the 3.3mm specimen was in question, wouldn't the 1mm specimen make it worse? Besides, there is no standard specimen at 1mm anyway, that's too thin. 2.5mm (.099") is the smallest specimen recognized by ASME Section VIII. Anything below that thickness is exempt from...
  6. CWEng

    PTAW vs. PAW (ASME IX Table QW-257.1)

    The arc is somewhere around 10,000 degrees F with either method, so it sufficiently heats and melts the base metal with either method. The main difference is for keyhole welding, which you aren't doing.
  7. CWEng

    PTAW vs. PAW (ASME IX Table QW-257.1)

    PAW can be transferred or non-transferred. Whether the process is transferred or non-transferred is dependent on the welding current circuit. For transferred, the circuit/arc goes from the torch to the workpiece. For non-transferred, the circuit/arc does not go though the workpeice, but from...
  8. CWEng

    ER70S-3 deposited hardness and machinability.

    Is the casting heat treated after welding? Stress relief PWHT will reduce the property differences, and normalizing PWHT will make the weld softer than the casting. In the as-welded condition, you will have the biggest property differences and machining issues. Do you know the heat treat...
  9. CWEng

    Welding S355NL2 for a special requierments project.

    You don't have to match the strength of the higher strenght member in dissimilar strenght joints in all the codes I've welded to. If you meet the strength of the S355NL while welding it to 4130, you should be fine.
  10. CWEng

    2507 superduplex welding residual stress relieving and permanent deformations

    In theory, a pressure test may be able to produce slight deformations, as residual welding stresses when present can be up to the yield strength of the material. When you hydro test, if the residual stresses are within 100MPa of the yield strength, you could get yielding in those locations...
  11. CWEng

    Contradiction on PQR qualification by others?

    Section IX is a service code. It supports the construction codes, such as III, VIII, or B31.X. The construction codes can use, modify, add to Section IX as they see fit. In the case of B31.3 it's modifying the requirements of Section IX.
  12. CWEng

    Garrmin. Both terrible and hilarious.

    Now I feel justified to have hung onto my Garmin program they don't support anymore that keeps all of my data on my own computer, rather than having to depend on their online services. Why does everyone (companies) feel like people shouldn't be able to keep their own data these days?
  13. CWEng

    Looking for correct weld symbology

    There aren't off the shelf welding symbols for every conceivable joint. When there isn't, AWS says (paraphrased) that drawings or descriptions other than standard welding symbols can be used. Your drawing looks like you are doing half of a plug and slot weld though.
  14. CWEng

    SA 514

    The ASME material with similar graces is SA-517. A lot of suppliers offer both.
  15. CWEng

    Do we have the possibility to transform PQR made according EN ISO 15614 to ASME Section 9

    It is possible given the right steps were made at the beginning and now, but talk to your notified body representative. They may or may not be willing to entertain the request. If not, it's no point in going further.
  16. CWEng

    Stainless Steel Pipe Grade 316 fabrication issues

    The welder is supposed to clean the base metal before he welds on it. Most do it with a grinder/sander rather than a chemical. Nothing wrong with that unless it's a contaminated abrasive. Not sure why the elbows were sanded though. However, if you specified a stainless steel that is so...
  17. CWEng

    A53 Gr. B pipe hardness

    Yes, but not the same residual stresses.
  18. CWEng

    Fronius 320i mig welding 0.8mm aluminium wire burn back & bird nesting in back

    Are you using a teflon coated liner for welding aluminim? They can help the wire feeding quite a bit. Assuming your issue is really wire feeding, not parameters, then use what Kingnero said: - a torch with an as short as possible cable run (max. 10 ft/3m, preferably shorter) If that doesn't...
  19. CWEng

    Flux-electrode combination classified in the as-welded condition, be qualified in a PQR with PWHT

    The filler metal can only be classified by what the manufacturer classifies it as. If you test it in a different condition, that is not prohibited by ASME IX or a construction code that I know about, but that doesn't change the classification. So your PQR would just record the classification...
  20. CWEng

    What is guaranty in welding electrode datasheet?

    Did you read footnote J to table 2?

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