17 Apr
2005
17 Apr
'05
4:26 a.m.
On Apr 16 2005, 21:32, Bob Shannon wrote:
I think the actual frame here is magnesium alloy, not
aluminum.
Any attempt to weld this might be spectacularly bad idea.
Why? Welding magnesium alloy is done in exactly the same ways as
welding aluminium, except of course that different composition filler
rods are preferred. The relevant properties (strength of the base
metal, electrical conductivity, melting point of the metal, high
melting point of the oxide, hydrogen inclusion in the molten metal,
etc) are very similar.
--
Pete Peter Turnbull
Network Manager
University of York
17 Apr
17 Apr
5:51 a.m.
Could be I have no idea what I'm talking about here.
But I do know many older HP devices use magnesium rather than
aluminum. As to how to weld these materials, I'm no expert.
But I'd rather not hear that the machine, and the shop that attempted
the repair had been reduced to ashes.
----- Original Message -----
From: "Pete Turnbull" <pete at dunnington.u-net.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Sunday, April 17, 2005 7:26 AM
Subject: Re: HP-2116A chassis (or repairing cast aluminum)
On Apr 16 2005, 21:32, Bob Shannon wrote:
I think the actual frame here is magnesium alloy,
not aluminum.
Any attempt to weld this might be spectacularly bad idea.
Why? Welding magnesium alloy is done in exactly the same ways as
welding aluminium, except of course that different composition filler
rods are preferred. The relevant properties (strength of the base
metal, electrical conductivity, melting point of the metal, high
melting point of the oxide, hydrogen inclusion in the molten metal,
etc) are very similar.
--
Pete Peter Turnbull
Network Manager
University of York
10:32 a.m.
On Apr 16 2005, 21:32, Bob Shannon wrote:
Presumably because of the erroneous idea that magnesium is highly
flammable, and other (common) metals aren't.
The wire filling in the old-type flashbulbs was rarely magnesium,
actually. More common were aluminium/magnesium alloys, or even just
aluminium...
-tony
I think the actual frame here is magnesium alloy,
not aluminum.
Any attempt to weld this might be spectacularly bad idea.
Why? Welding magnesium alloy is done in exactly the same ways as
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ard＠p850ug1.demon.co.uk -
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