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Thread: dye pen

  1. #1
    Join Date
    Jan 2013
    Posts
    19

    Default dye pen

    Hey I'm wondering what an acceptable standard is for dye testing welds. Everything I've researched shows that you spray the dye on the weld to check for surface cracks. However is it acceptable or up to aws or asme code to dye the backside of the weld and spray the developer on the weld itself to see if the dye bleeds through the piece?

  2. #2
    Join Date
    Nov 2011
    Location
    Edmonton
    Posts
    43

    Default dye pen

    You spray the dye onto the weld- let sit 10 minutes- wipe off really well then spray the developer on and wait 10-15 minutes and look for the dye to show up on the white developer. Never seen it done the other way though..

  3. #3
    Join Date
    Apr 2009
    Posts
    360

    Default

    Quote Originally Posted by Scottis1 View Post
    You spray the dye onto the weld- let sit 10 minutes- wipe off really well then spray the developer on and wait 10-15 minutes and look for the dye to show up on the white developer. Never seen it done the other way though..
    Clean the weld very well
    Apply dye and let penetrate for 15min
    Wash off dye with water and rag/towel
    Spray on developer and observe. No wait time is necessary here

    Because the dye has no surface tension, it gets into tiny spots that the rinsing water can't.

  4. #4

    Default

    Quote Originally Posted by ryarelliott View Post
    Hey I'm wondering what an acceptable standard is for dye testing welds. Everything I've researched shows that you spray the dye on the weld to check for surface cracks. However is it acceptable or up to aws or asme code to dye the backside of the weld and spray the developer on the weld itself to see if the dye bleeds through the piece?

    No it's not acceptable under those codes. For several reasons.

    How in the world would you discover surface cracks by spraying the penetrant on the "back" of the weld? Might as well spray it on the ground a quarter mile away.

    JT
    Some days you eat the bear. And some days the bear eats you.

  5. #5
    Join Date
    Jan 2013
    Posts
    19

    Default dye pen

    Ok thanks guys. The answers you gave me back up what I've researched.

  6. #6
    Join Date
    Jan 2013
    Posts
    19

    Default miller ac

    Hey I'm considering buying one of the ac packs for your welding hood off the miller site. Does anyone know if they are worth the 300 bucks?

  7. #7
    Join Date
    Jan 2007
    Location
    Alberta Red Deer
    Posts
    373

    Default

    when we check tanks we will spray dye on the inside and developer on the outside (leave for a few hours before checking). this does not meet any codes but will tell you if there is a leak and will hold fluid. this is done buy many companies to check tanks and also worked with some companies that fog dye inside and test the out side to pass for the API certs. so yes this will work to look for leaks in a tank. if you are looking for cracks in the weld zone then use as described on the can.
    trail blazer 302
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  8. #8
    Join Date
    Jan 2012
    Location
    Marsden, sk. Canada
    Posts
    29

    Default

    if coating/painting is not an issue you can also use diesel pen. it is an acceptable test on large storage tanks for the floor to shell weld

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