JohnFol
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| posted on 7/10/02 at 12:16 PM |
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Firewall
If you have a book to hand, could someone look something up for me?
There is a metal plate that goes in between the passengers feet and the engine bay. What guague steel is suggested? Same question but for the wierd 4
sided panel that goes right next to where people sit.
ta
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David Jenkins
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| posted on 7/10/02 at 12:46 PM |
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I used the same material as used for the floor - 1.6mm, 16swg - as I believe that they're a bit structural.
Others have used aluminium, so perhaps my theory's a load of donkey's gibblets!
David
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Simon
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| posted on 7/10/02 at 01:06 PM |
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John,
This is amazing. I had drafted a similar poser, with same heading, but didn't post. Don't know why.
I'm using 16 swg, but wanted to know if I should fully weld all those you mentioned, and the top sheet (where battery sits). The footwell ends are
fully welded, as is n/s transmission tunnel (under scuttle). I think it's going to be a nightmare trying to get the nuts on gearbox mounting if I
weld in o/s tunnel too.
ATB
Simon
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David Jenkins
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| posted on 7/10/02 at 01:19 PM |
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My top sheet is 1.6mm ali.
All the steel sheet on my chassis is stitch-welded (weld for an inch, skip a few inches, weld for an inch, ...etc.). Followed this up with some
polyurethane mastic to prevent water leaks.
I managed to reach down far enough to get the bolts through the gearbox mounting - it's a pig, but it can be done. Once in, I got my wife to hold a
socket onto the bolt while I reached under to do up the nut. If you snuggle into the side of the chassis you can just about reach the nut with a
ratchet handle!
Any more questions? 
David
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Simon
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| posted on 7/10/02 at 01:37 PM |
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Thanks
ATB
Simon
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JohnFol
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| posted on 7/10/02 at 03:17 PM |
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Can Aluminium be welded with MIG using co2 + argon? I though there were problems, like noxious fumes. ..
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Simon
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| posted on 7/10/02 at 03:32 PM |
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John,
Ally can be gas welded (but not to steel).
Will lookup in Fourniers book ce soir to find out what gas tips he gives.
ATB
Simon
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twentyover
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| posted on 7/10/02 at 03:40 PM |
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Welding aluminum to aluminum, use straight argon for both MIG and TIG. Aluminum cannot be welded to steel by conventional means due to the huge
differences in melting temperature
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johnston
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| posted on 7/10/02 at 06:52 PM |
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im usin argo sheild lite any1 know if thats ok for ali
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JohnFol
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| posted on 7/10/02 at 06:55 PM |
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So I guess that's why several panels are done with rivets .. ..
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stephen_gusterson
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| posted on 7/10/02 at 07:07 PM |
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you cant weld dissimilar metals regardless of temperature ranges.
Alu is apparently a bas&&rd to weld even to alu.
atb
steve
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paulbeyer
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| posted on 7/10/02 at 08:47 PM |
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Hmmm does that mean that stainless steel can't be welded to mild steel then? 
quote:
you cant weld dissimilar metals regardless of temperature ranges.
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chrisg
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| posted on 7/10/02 at 08:51 PM |
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Of course if you could gas weld ali, you could make your own nosecone 
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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cymtriks
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| posted on 7/10/02 at 08:54 PM |
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Those panels are structural and may be in either 16 or 18 gauge steel. I don't like the idea of riveted alloy in these regions as it has very little
strength compared to welded in steel. Most kit car spaceframes are actually no better than well designed ladder frames of the same weight and I reckon
that putting alloy in these places would nudge the lowcost frame in that direction. You might find my suggested mods for doubling the chassis
stiffness while also making it lighter and simpler interesting. You'll have to scroll back a bit to find it.
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stephen_gusterson
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| posted on 7/10/02 at 10:08 PM |
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quote:
Hmmm does that mean that stainless steel can't be welded to mild steel then?
quote:
you cant weld dissimilar metals regardless of temperature ranges.
Actually, you can.
I have welded mild to stainless and there seems to be no problems at all. Not being a metalurgist(sp?) I cant say if this would be good in a
structural situation, but it seems to weld up fine no probs.
atb
steve
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stephen_gusterson
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| posted on 7/10/02 at 10:20 PM |
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http://www.swifts.com/dn/galvprev.html
The above link is a table of metal compatability. Looks to me that alu and steel (as far as corrosion is concerned) isnt as bad as had been mentioned
before on this site.......
Alu and steel are in contact on the rivets and panels.
atb
steve
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