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Microscopic Views of Magnesium in regard to Painting/Welding

Discussion in 'Technical Area' started by chy_farm, Jul 7, 2017.

  1. chy_farm

    chy_farm Pinnacle OPE Member

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    A friend of mine, Brian whom I met at the Arborists Site, is a paint pro who taught me that magnesium spits out dirt and oil when it was baked in an oven for some period. An experiment was done the day before to see how it goes after baking.

    (Specimen)
    A piece of magnesium plate I got from Stihl 084AV which I previously tinkered. It's got a sandpaper treatment, #240, then #3000 whetstone.
    specimen.JPG


    (Before baking)
    magnitude x200.
    n3000_x200_light_from_05,00.JPG

    (After baking in an oven for 5 minutes at 120degrees Celsius)
    magnitude x200.
    after_baking_00.JPG


    (After baking)
    after_baking_02.JPG

    (After baking)
    after_baking_03.JPG

    some more will come soon,
     
  2. chy_farm

    chy_farm Pinnacle OPE Member

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    (After baking)
    after_baking_07.JPG

    Amazing to see these, what Brian taught me was definitely right!
     
  3. JonCraig

    JonCraig Super OPE Member

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    So would it be beneficial to sand, clean, then bake, clean, then paint? How much crud comes out after subsequent baking?
     
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  4. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    Pretty much what you have to do to weld it too. Clean, blast, heat, wire brush weld area, then maybe you can start adding filler.
     
  5. chy_farm

    chy_farm Pinnacle OPE Member

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    Brian tells me he was successful in painting after he baked them in oven. How much? yet had much evidence to tell how much, will do some more examination when I got time to. Thanks.
    Chy
     
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  6. chy_farm

    chy_farm Pinnacle OPE Member

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    Reasonable for painting, but still wonder if crud affects welding? How was your expericence Srcarr.
    Chy
     
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  7. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    When more crud comes out you have to stop and wire brush it off.
     
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  8. chy_farm

    chy_farm Pinnacle OPE Member

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    Good evening Srcarr52, nice to have a message from you here, your video of welding Solo Twins cover is one of my favorites. Thanks for you tip about this, will keep it in mind when I try TIG.

    Nothing about painting things (which is the theme of this thread though), but could you tell me a little more about the filler/fillers you use for mag. You stated in the video that you are using AZ92A filler, are there other fillers besides this. I know mag alloy used for saws varies its structure in alloy compositions, mean they depends on manufactures. So I am assuming if you are using several kinds of fillers for this welding depending on their make.
    Chy
     
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  9. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    I should do some more welding videos, people seem to appreciate them.

    There are only a few alloys of filler for magnesium. AZ92A is the most recommended for castings, there is AZ101 which is supposed to be more forgiving but I haven't found any before. AZ61A is cheaper and can be used for cast but I think it's more aimed at extrusions. I don't think the alloy of the base alloy matters as much as the amount of contaminates that where allowed in the casting and the porosity which holds other contaminates. Also it's important to knock the surface oxidation off your filler material so you don't introduce it into your weld. I clean the filler with scotch brite the filler and clean with acetone before using it.
     
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  10. chy_farm

    chy_farm Pinnacle OPE Member

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    Thanks Srcarr, this blue part above is very informative, also did not think of Scotch Brite to be so useful, lol.
    chy
     
    Last edited: Jul 17, 2017
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  11. chy_farm

    chy_farm Pinnacle OPE Member

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    I placed inquiries to a couple of filler manufacturers in our local area before noon, one of them gave me a reply, says they have AZ91A and AZ61A in their stock, but no AZ92A, AZ101 for now.
    Amazing to me was the price, their offer is nearly 20 bucks for one piece!
     
  12. Moparmyway

    Moparmyway Its just a saw

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    It aint cheap here either ........
     
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  13. chy_farm

    chy_farm Pinnacle OPE Member

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    :yawn:
     
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  14. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    I've found the best deals on Amazon or eBay. Blue Demon ERAZ92A.
     
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  15. chy_farm

    chy_farm Pinnacle OPE Member

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    Thank you for information, had a look at this site. I see the diameter as 1/8'', length 38'', but was not able to find how many filler rod does one package has, five?
    Chy
     
  16. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    It's sold in 1lb packages, density of raw magnesium is 0.063 lb/in^3 so it should be around 34 1/8" rods in the package.
     
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  17. chy_farm

    chy_farm Pinnacle OPE Member

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    34 rods!! wow, it's a nice deal isn't it!
     
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  18. chy_farm

    chy_farm Pinnacle OPE Member

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    Also found another seller on eBay who sells them for some $41.09.
    An anxiety to me is that this manufacturer Blue Demon is an Mexican maker according to Wiki, and some guy leaves a negative feedback on eBay like "extremely poor in quality", though it's for flax....
    Could you tell me your experience Srcarr pls.
     
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  19. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    I haven't used any magnesium filler from Blue Demon before so I can't speak to its quality.
     
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  20. chy_farm

    chy_farm Pinnacle OPE Member

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    :crybaby2:
     
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