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Old 10-03-2021, 06:34 PM
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Default Metalurgical tests

What tests to determine aluminum and magnesium?
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Old 10-03-2021, 07:10 PM
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We talking old school redneck, no money ?

Fire with water vs no fire ?
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Old 10-03-2021, 07:26 PM
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Put a bit of battery acid on magnesium, and it will bubble up and turn black. On aluminum, it will just run off. That’s how my dad would test magnesium scrap.

Or you could file a bit off and try to light it. Magnesium will make bright sparks as it burns.


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Old 10-03-2021, 09:08 PM
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Put a bit of battery acid on magnesium, and it will bubble up and turn black. On aluminum, it will just run off. That’s how my dad would test magnesium scrap.

Or you could file a bit off and try to light it. Magnesium will make bright sparks as it burns.


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I will try the last idea. Always been a fan of fire.
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Old 10-04-2021, 07:06 AM
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If you can cut off a sliver with a knife, Aluminum will curl off and Magnesium will break off into small chips.(Think of magnesium fire starters)

Dt
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Old 10-04-2021, 09:53 AM
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Originally Posted by toprecycler View Post
Put a bit of battery acid on magnesium, and it will bubble up and turn black. On aluminum, it will just run off. That’s how my dad would test magnesium scrap.

Or you could file a bit off and try to light it. Magnesium will make bright sparks as it burns.


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Aluminum will do that...
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Old 10-04-2021, 12:09 PM
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The item in question is a new 12V wind generator motor a friend bought, and he was bolting on the base mount and over tightened the bolts and broke out a piece of the motor casing. He brought it over last night and the mounting ear is 1/4" away from the motor windings so would have to be completely disassembled in order to do a weld repair. The motor has 4 attachment bolts so suggested to him to get some JB weld and a stainless steel hose clamp since I am not set up to weld aluminum or magnesium. He paid $1200 for the motor.

I will try to remember the advice here for the future. Thanks.
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  #8  
Old 10-04-2021, 02:08 PM
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Quote:
Originally Posted by toprecycler View Post
Put a bit of battery acid on magnesium, and it will bubble up and turn black. On aluminum, it will just run off. That’s how my dad would test magnesium scrap.

Or you could file a bit off and try to light it. Magnesium will make bright sparks as it burns.


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Bryan, your test will not differentiate aluminum and magnesium.

https://www.reference.com/science/ha...4ac52e9967b8e3

https://socratic.org/questions/alumi...fate-al2-so4-3

Had time to find some linkies for you...

But what the fuck do I know...
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Old 10-04-2021, 02:11 PM
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Quote:
Originally Posted by milomilo View Post
The item in question is a new 12V wind generator motor a friend bought, and he was bolting on the base mount and over tightened the bolts and broke out a piece of the motor casing. He brought it over last night and the mounting ear is 1/4" away from the motor windings so would have to be completely disassembled in order to do a weld repair. The motor has 4 attachment bolts so suggested to him to get some JB weld and a stainless steel hose clamp since I am not set up to weld aluminum or magnesium. He paid $1200 for the motor.

I will try to remember the advice here for the future. Thanks.
I doubt it is magnesium, mag is very expensive, but I would call the
manufacturer, see what the material is and also if they have a part
available and what the cost is.

Tell your friend to buy a torque wrench and use it.

You would need a glove box to weld magnesium and purge it well with Argon.
I have had the joy of welding mag in the Navy, not fun. But I did not burn the ship down either.

Aluminum is a piece of cake. relative.
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  #10  
Old 10-04-2021, 04:37 PM
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Quote:
Originally Posted by Shade Tree Welder View Post
I doubt it is magnesium, mag is very expensive, but I would call the
manufacturer, see what the material is and also if they have a part
available and what the cost is.

Tell your friend to buy a torque wrench and use it.

You would need a glove box to weld magnesium and purge it well with Argon.
I have had the joy of welding mag in the Navy, not fun. But I did not burn the ship down either.

Aluminum is a piece of cake. relative.
I did have a talk with him about torgue values.
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