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Author welding aluminium
Jas
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Registered: 13th Oct 04
Location: Mid Wales
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22nd Mar 10 at 19:39   View User's Profile U2U Member Reply With Quote
I've got the chance to buy a really cheap mountain bike frame which is worth a fair bit to buy

Only problem being It once experience a small crack so he had a plate welded on it

Id like to keep it and make a little project bike

but is it likely to brake on me?

Im just not too clued up with welds etc?











[Edited on 22-03-2010 by Jas]
gazza808
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Registered: 30th Jun 08
Location: Peterborough
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22nd Mar 10 at 19:48   View User's Profile U2U Member Reply With Quote
if done properly shouldn't be a problem.
wouldn't bother me, just keep an eye on it lol.
Jas
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22nd Mar 10 at 19:50   View User's Profile U2U Member Reply With Quote
ok, I was going to get my mate to strip it down and spray rear black and front white, maybe try tidy up the plate while he does so
ed
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Registered: 10th Sep 03
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22nd Mar 10 at 19:55   View User's Profile U2U Member Reply With Quote
An aluminium bike frame will be heat treated, therefore a repair is a no no.
Jas
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22nd Mar 10 at 19:58   View User's Profile U2U Member Reply With Quote
seriously? :/
ed
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22nd Mar 10 at 20:00   View User's Profile U2U Member Reply With Quote
Well, you'll have to find out what it's made of. Aluminium is a single term for such a wide range materials! If it's heat treated then it's quite unlikely the repair will be very successful.
gazza808
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22nd Mar 10 at 20:39   View User's Profile U2U Member Reply With Quote
seen fair few similar repairs that have worked just fine,
And being a engineer/welder, that also does tig welding I'd be confident it'd be fine,
Looks like a xc frame? So won't be under huge stresses like a dh frame etc. Like I said I'd just keep an eye on it.
richc
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Registered: 24th Mar 07
Location: Ilkeston
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22nd Mar 10 at 21:50   View User's Profile U2U Member Reply With Quote
Be rate
Jas
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Location: Mid Wales
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22nd Mar 10 at 21:50   View User's Profile U2U Member Reply With Quote
yes its an xc frame, i'll get some close ups of the weld now
Jas
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Location: Mid Wales
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22nd Mar 10 at 21:54   View User's Profile U2U Member Reply With Quote
http://is.pinkbike.com//photo/3519/pbpic3519084.jpg
Jas
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Location: Mid Wales
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22nd Mar 10 at 21:58   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by ed
Well, you'll have to find out what it's made of. Aluminium is a single term for such a wide range materials! If it's heat treated then it's quite unlikely the repair will be very successful.


Frame is AluxX SL 6013
ed
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22nd Mar 10 at 22:16   View User's Profile U2U Member Reply With Quote
I'd imagine that's cracked because of fatigue. It says on my data sheet that 6013 aluminium should be heat treated after welding. Buy the frame at your own risk TBH.

What kind of XC bike has a chain guide like that too?
Doug
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Registered: 8th Oct 03
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22nd Mar 10 at 22:20   View User's Profile U2U Member Reply With Quote
Stop being a pikey Jas.

You have changed since I moved away.....
Jas
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22nd Mar 10 at 23:58   View User's Profile U2U Member Reply With Quote
suck me beautiful
xa0s
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Location: Dartford, Kent Car: Turbo'd Fabia vRS
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23rd Mar 10 at 05:20   View User's Profile U2U Member Reply With Quote
Zilent:
*If it was an aluminium frame, I wouldn't trust anything but a tig
Kryptix:
*but if it was tig'd, it'd be ok?
Zilent:
*That depends on how well the weld was shielded by the sheilding gas, the penetration of the weld, the type of weld (butt weld, plate, etc)
*Also depends on how much the rider beats the hell out of it
*If it was tigged correctly, it'll be stronger than original

Mate of mine who's a welder.

[Edited on 23-03-2010 by xa0s]
Jas
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23rd Mar 10 at 09:42   View User's Profile U2U Member Reply With Quote
yes spoke to a couple of mates who weld yesterday, but they don't do alu

and they said providing its clean and there are no cracks it should be fine

DaveyLC
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23rd Mar 10 at 10:15   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by ed
An aluminium bike frame will be heat treated, therefore a repair is a no no.


Ditto

Will be 7075 alu.. Wanker to weld as its so brittle once welded.
ed
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23rd Mar 10 at 10:31   View User's Profile U2U Member Reply With Quote
He seems to think it's 6013...
DaveyLC
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23rd Mar 10 at 10:34   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by ed

What kind of XC bike has a chain guide like that too?


Giant Faith isnt it? More of a free-ride bike

The NRS is the XC bike
Jas
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23rd Mar 10 at 11:21   View User's Profile U2U Member Reply With Quote
nah its giant AC and yes its 6013
DaveyLC
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23rd Mar 10 at 11:40   View User's Profile U2U Member Reply With Quote
If you weld it, it will more than likely crack around the welds eventually and you'll be chasing the cracks away

A shit hot areospace welder with access to an ultrasonic crack detector could sort it for you but you got to find one lol

I had a fox shock that had cracked sorted out by my old dears neighbour who is just one of said shit hot welders.. It was fine for years
Jas
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Location: Mid Wales
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23rd Mar 10 at 22:45   View User's Profile U2U Member Reply With Quote
might have to just ebay it then, dont think id lose to be honest, just a frame that Ive always liked the look of for a very small price
DaveyLC
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Location: Berkshire
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23rd Mar 10 at 23:07   View User's Profile U2U Member Reply With Quote
What did you pay for it?
Jas
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Location: Mid Wales
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23rd Mar 10 at 23:15   View User's Profile U2U Member Reply With Quote
40 quid
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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24th Mar 10 at 07:24   View User's Profile U2U Member Reply With Quote
If you get stuck I'll buy it

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