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Tig welding magnesium advice

Discussion in 'Tools' started by lehman live edge slab, Jul 10, 2019.

  1. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    just looking for input on tig welding magnesium and even some on aluminum. I’ve done aluminum tig, spool gun/push-pull and aluminum stick but by no means am great at it.
     
  2. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    065E2FA0-0AC1-4AEE-8B6B-8290C65504C0.jpeg
    First project for the new tig welder is putting new skeg on my 150 mercury. Found rock pile last weekend cost a skeg and a 4 blade aluminum prop.
     
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  3. srcarr52

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

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    Prep, prep and more prep. Other than needing different filler and the chance of fire it's not much different from welding aluminum.
     
  4. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    Ok, what do you do for the chance of fire? Weld it outside with a pile of sand near by if it’s a small piece. Catches fire bury in sand to snuff it out ?
     
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  5. Deets066

    Deets066 AKA Deetsey

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    Clean it, bake, broil, sauté, blast and repeat.
     
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  6. srcarr52

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

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    Use lots of shield gas with a big nozzle.

    Be ready to bury it in foundry sand or glass beads if it's an expensive part. On the stuff I normally weld I'm ready to knock it on the floor and roast marshmallows.

    Fortunately, I've only caught my filler wire on fire before.
     
  7. Dustin4185

    Dustin4185 Pinnacle OPE Member

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    Out prop shop only charges $100 for skeg repairs. I also may have a bare gear case for a 150 Optimax around here somewhere.
     
  8. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    There is a prop shop about 60 miles away last prop was 80$ to fix and a skeg was like 125$. But I was thinking I can weld it myself and the skeg blank was like 30-35$ only. I have a 2013 150 four stroke mercury that from what I’ve read has the same gearcase as a 250-300 verado.
     
  9. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    I’m using aluminum prop for the reasons seen here, known two many guys that have lost the whole lower unit due to a stainless prop. Running an alpha 4 18 pitch because the stock 3 blade black max 21 pitch would only get barely into the wot running range had bad hole shot and would blow out in the corners. Now it performs way better everywhere but top end which I dropped about 4-5 mph
     
  10. Dustin4185

    Dustin4185 Pinnacle OPE Member

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    Working through a propping issue on a patrol boat now. They were surplussing it and I grabbed it before it went to Nashville. The motor was mounted WAY to low and had a 3 blade 17P on it. I raised the motor and it kept hitting the limiter. Tried a 19p/3b and still too small but 21p/3b was too much. Settled on a 19p/4b Proptech SS. Trimmed down 5200, up 5600 RPM. Not a whole lot of rock here, but my river boats all run AL props!
     
  11. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    My boat is a Lund 1875 impact and the motor was factory rigged at the dealer. As far as mounting hight I’d hope that mercury would have the mounting correct since Brunswick owns mercury, Lund, crestliner, Lowe and a bunch more brands. And I realize props are always a compromise but the factory one was useless in all my uses but top end that I don’t care much about. Does 43 with a boat full of people and gear pops right out of the water and runs 5500-5600 at wot.
     
  12. Dustin4185

    Dustin4185 Pinnacle OPE Member

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    This is a Triton that was old school built in TN. Most our boats around that time were low bid, from dealers and setup there. All of these boats this style had motors mounted way too low. They are stepped hulls. We had some Brunswick Trophy's that were decent boats and the newer Whaler LE boats are bad a$$, but they quit making them.
     
  13. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

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    Is that skeg aluminum or Mag?

    I have found that pulse helps me with Mag. I never use pulse on aluminum unless it’s thin and I’m by an edge.

    I personally like 2% lanthanated tungsten for everything. No worries about radioactive dust either, like thoriated. Also, thoriated always gets little “fingers” on the tip on AC for me. The 2% lanthanated just forms a nice tiny ball at the tip.

    I always use a gas lens, not sure why anyone wouldn’t want to. If Mag ever goes on fire, just smother it with shielding gas. I’ve been lucky and haven’t had an issue, but I always keep a pair of pliers around to grab it and walk it outside should it ignite.

    The hardest thing I see for your job is keeping it all straight. Unlike steel, you can’t really tack and bend aluminum. It has to be on the money before you mash the pedal.
     
  14. lehman live edge slab

    lehman live edge slab Pinnacle OPE Member

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    Lower unit is cast aluminum from all I’ve been told or read. New blank is like 35$ guy at works like just bring it in aluminum is to hard to weld. Said not that bad to weld and why give 150-200 for that when I can just buy a blank and repair myself. The prop on the other hand needs to go in because I don’t have a way to form them or set pitch
     
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