Weld problems

  1. Jacktegla

    Jacktegla Member

    Messages:
    474
    Location:
    Denbighshire
    I've got a parweld xte171c and its been great for the past few years but I've noticed over the past couple of months this problem where I can get porosity in the welds sometimes but not others even when only minutes apart without changing settings.
    Sometimes it won't happen and it will weld ok but others I cant get a weld without porosity ive attatched the settings ive used on these few test welds to show what happens. Any ideas? Thanks 20200926_124409.jpg 20200926_124417.jpg 20200926_124345.jpg 20200926_124351.jpg 20200926_125117.jpg No porosity in these welds which i did first, then I did these.
    20200926_125133.jpg 20200926_125207.jpg 16011215981692751945475520064082.jpg
     
  2. octo0072000

    octo0072000 Member

    Messages:
    5,442
    Location:
    south yorks
    looks like a gas problem (lack of gas)
     
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  3. fixerupper

    fixerupper Member

    Messages:
    1,632
    Location:
    Crete Greece
    Yeah it does look like a lack of gas problem ..was it a breeze in the workshop ?
     
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  4. Jacktegla

    Jacktegla Member

    Messages:
    474
    Location:
    Denbighshire
    No all doors are closed. Could it be something to do with torch or regulator.
     
  5. octo0072000

    octo0072000 Member

    Messages:
    5,442
    Location:
    south yorks
    is the problem always at the start of a run or not
     
  6. Jacktegla

    Jacktegla Member

    Messages:
    474
    Location:
    Denbighshire
    Yest mostly and sometimes it stops and sometimes its for the whole weld.
     
  7. octo0072000

    octo0072000 Member

    Messages:
    5,442
    Location:
    south yorks
    could be the gas valve sticking
     
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  8. Jacktegla

    Jacktegla Member

    Messages:
    474
    Location:
    Denbighshire
    Is that in the welder or torch ? . I can hear gas come out of the torch when the trigger is pressed.
     
  9. a111r Member

    Messages:
    889
    Location:
    London
    Gas solenoid inside the machine. Easy to take out, dismantle and clean. Crud can stick them both open and closed.
     
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  10. octo0072000

    octo0072000 Member

    Messages:
    5,442
    Location:
    south yorks
    also could be a small gas leak in the pipe to the torch as you are losing gas at the start of a weld
     
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  11. Hitch

    Hitch Moderator Staff Member

    Messages:
    12,463
    Somerset
    Check the torch is tight...and other gas connections... spark burn in the gas pipe...?
    Hose loose in the torch?
     
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  12. Jacktegla

    Jacktegla Member

    Messages:
    474
    Location:
    Denbighshire
    I did upgrade my torch about 2 months ago but it did happen with the old torch aswell.
     
  13. Robert Mullins Member

    Messages:
    111
    Location:
    Salisbury, uk
    Check you gas flow from out of the gas shroud with a flow meter, you'll be needing a out 12/13 litres a minute for light sections, and going up to 18/19 LPM on heavier steel: I have welded in ship building and repair and have not been instructed to use any more, although there may well be people who have:
    Your regulator is set to 10lpm, that's what's apparently going into the torch, this is an inadequately volume to start with, and may(probably) bear no similarity to what exhausting at the shroud end
     
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