cliftyhanger
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| posted on 5/3/19 at 11:04 AM |
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Repairing aluminium casting
I have a "bit" of gear linkage housing (old Triumph gearbox) that has broken. Made of cast ali, so I can't mig it.
Has anybody tried the Lumiweld/aluminium brazing rods that are sold? Experiences would be very welcome.
The part is not massively stressed, but does get the occasional whack if a gear change is aggressive. So it is not just a a cosmetic repair
required.
And I have seen epoxy resins/putties that claim to be "stronger than the base metal" but again, anybody got experience?
TIA
Clive
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rusty nuts
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| posted on 5/3/19 at 11:19 AM |
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Probably better to find someone to TIG weld it, maybe cheaper as well?
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Mr Whippy
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| posted on 5/3/19 at 12:12 PM |
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I've used the aluminium brazing rods before and you need a lot of heat to get them going and very clean metal, they do work but the balance
between soft and pliable to running all over the place is tricky. It hardens very quickly so crystals tend to be big and the part brittle. Used JB
weld a lot too and it's good for repairing cracks, hose fittings etc but not for what you are talking about
I think I'd opt for getting it tig welded.
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JAG
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| posted on 5/3/19 at 12:26 PM |
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I've used Technoweld for Aluminium brazing. It works but does need a lot of heat as the Aluminium parts conduct the heat away from the joint.
Anything with any mass, say thicker than 3mm or so, will be hard to get hot enough and keep hot enough; unless you have a suitable Oven!
I'd get someone local to TIG weld it for you 
[Edited on 5/3/19 by JAG]
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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theconrodkid
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| posted on 5/3/19 at 02:24 PM |
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https://www.mig-welding.co.uk/
have a word on ^^^, should be someone local that would tig it for you
who cares who wins
pass the pork pies
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gremlin1234
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| posted on 5/3/19 at 04:41 PM |
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quote:
Originally posted by cliftyhanger
I have a "bit" of gear linkage housing (old Triumph gearbox) that has broken. Made of cast ali, so I can't mig it.
I assume its the gearbox top cover/extention
https://rimmerbros.com/Item--i-GRID005689
if so the top is relatively flat, and you may be able to bolt on an external reinforcement
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cliftyhanger
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| posted on 5/3/19 at 05:53 PM |
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It is sadly the rarer, and very tricky to find, overdrive later gearbox. Last linkage I saw was over £100 (for the linkage) so I don't think I
will get lucky.
As I suspected, the magic fixes don't work. I have a lead on a local TIG welder, will get in touch.
Thanks all.
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James
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| posted on 5/3/19 at 11:42 PM |
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At Mclaren they use Devcon for repairing all sorts of bits of tools and equipment.
I would certainly consider using it for something like this.
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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fazerruss
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| posted on 6/3/19 at 01:30 PM |
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These are the kind of jobs I do in my spare time (TIG). I'm.not local though so it would need to be posted to me.
Do you have any photos of the damage?
http://www.mig-welding.co.uk/forum/threads/motorcycle-crank-case-repair.85103/
[Edited on 6/3/19 by fazerruss]
"if assholes could fly this place would be an airport"
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