welding magnesium to aluminum

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Old Jun 18, 2007 | 07:44 AM
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Default welding magnesium to aluminum

I picked up a cast magnesium dry sump oilpan. The pickup tube location is unthreaded, and it would be ideal to have an AN fitting/bung welded in. I know magnesium isnt the most welder friendly material, and I have no idea if its even possible to do al to mg figured I would try on here first.

thanks - Chris

the pan in question is on the left

and the pos that would be getting the pan

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Old Jun 18, 2007 | 09:06 AM
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Doing some research.


Modified by TOFU.man at 8:19 PM 6/18/2007
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Old Jun 18, 2007 | 09:47 AM
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Default Re: (TOFU.man)

No you cannot weld magnesium and aluminum together, and have them hold. Welding alum to mag creates brittle inner-metallic compounds; the weld may appear sound, but it will crack when put under even the lightest load.
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Old Jun 18, 2007 | 01:27 PM
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Default Re: welding magnesium to aluminum (chrisbmx68)

Why not just tap it with like a 1/2 NPT or something and thread a fitting in there. You could do like a 1/2 NPT to -12 fitting. I'm sure that would work out fine.
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Old Jun 18, 2007 | 02:20 PM
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Default Re: welding magnesium to aluminum (ssmdc2)

Or use bulkhead fittings if its thin.
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Old Jun 18, 2007 | 03:37 PM
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Default Re: welding magnesium to aluminum (ssmdc2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ssmdc2 &raquo;</TD></TR><TR><TD CLASS="quote">Why not just tap it with like a 1/2 NPT or something and thread a fitting in there. You could do like a 1/2 NPT to -12 fitting. I'm sure that would work out fine.</TD></TR></TABLE>

2nd.
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Old Jun 19, 2007 | 02:53 PM
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that motor is ****** beautiful! ABA alternator swap.... G60 VC, what is the intake mani and what fuel management are you rinning, i know it cant be digi, you only have one coolant temp sensor.... megasquirt?
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Old Jun 19, 2007 | 03:43 PM
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Default Re: (sailman)

ah , buying one of Issam's pans huh .
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Old Jun 20, 2007 | 02:46 PM
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Default Re: welding magnesium to aluminum (chrisbmx68)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chrisbmx68 &raquo;</TD></TR><TR><TD CLASS="quote">

</TD></TR></TABLE>

don't really know much about VW.... but where is the exhaust manifold?? on the same side of the intake manifold?
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Old Jun 20, 2007 | 06:25 PM
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Default Re: welding magnesium to aluminum (TRAN)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TRAN &raquo;</TD></TR><TR><TD CLASS="quote">

don't really know much about VW.... but where is the exhaust manifold?? on the same side of the intake manifold?</TD></TR></TABLE>
i was thinking the same exact thing!
why are there plugs wires going into what looks to be exhaust ports?
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Old Jun 21, 2007 | 04:15 PM
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Default Re: welding magnesium to aluminum (CivicVX94)

ya, the intake ports do a nasty turn inside the head and the exhaust manifold is under the IM. really fun to work on

Not really sure what vw was trying to acheive but they made them forever, i think late 70s to till the early 90s.
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Old Jun 21, 2007 | 04:33 PM
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Default Re: welding magnesium to aluminum (Bailhatch)

counterflow heads rock! ok maybe not
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Old Jun 24, 2007 | 06:53 PM
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yes it was issams pan, he is a bad influence trying to sell me that huge supervee cam too!

im running megasquirt and its an abd intake modified to mount to the strut bar, its a work in progress a lot of little stuff just trying to clean up the bay in general and make things easier to work on

counterflow heads ftw
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Old Jun 24, 2007 | 06:54 PM
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p.s. im going to end up tapping it for a AN fitting
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Old Jun 24, 2007 | 07:12 PM
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Default Re: (chrisbmx68)

DONT TAP IT .use a bulk head fitting it will work better and be stronger . you wont have to wory about over tightening the fitting .
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Old Jun 24, 2007 | 07:30 PM
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you cant get at the back of the hole from inside the pan, it necks down and forces the oil through a rectangular slit.

the only way i see is to tap it or use a pipe slightly smaller than the hole with an o ring
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Old Jun 24, 2007 | 08:05 PM
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Default Re: welding magnesium to aluminum (Bailhatch)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bailhatch &raquo;</TD></TR><TR><TD CLASS="quote"> Not really sure what vw was trying to acheive but they made them forever, i think late 70s to till the early 90s. </TD></TR></TABLE>

I've seen nissan and Chevy straight 6's with the same design...The common denominator amongst all of them is torque, so I imagine that design as somethin to do with it.
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Old Jun 25, 2007 | 06:17 PM
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Default Re: welding magnesium to aluminum (...Lost)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ...Lost &raquo;</TD></TR><TR><TD CLASS="quote">

I've seen nissan and Chevy straight 6's with the same design...The common denominator amongst all of them is torque, so I imagine that design as somethin to do with it.</TD></TR></TABLE>

ehh, they just have peak VE at a low rpm becasue the head chokes up so fast. Your always gonna 'make tq' on motor that doesnt rev much past 5k. Do that on a 2l or smaller and you have a slow car....do it on a 5l and you have a muscle car. rpms or displacment...pick one (or both )
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Old Jun 26, 2007 | 09:32 PM
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Default Re: welding magnesium to aluminum (Bailhatch)

I had an L16 Datsun that is not a cross flow head with a turbo that made over 200 hp in 1976.I ran it at Ontario Motor Speedway and went 14.02 106 in a pick up.But
about the mag stuff.Get an old air cooled case and cut out a piece of the case that you can use .Then it will weld nice.
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