tompat3463
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| posted on 17/5/11 at 04:50 PM |
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welding aluminium crank case
I recently bought a spare fireblade engine from ebay..
I has on of the mounting points snapped off from the accident
Im wondering the best way to repaiar this
a friend of mine is a welder and he can weld alu coz he's done it for me before but what is the best way to do this ??
1. Build up a series of welds and then shape these to the correct size and shape then drill and tap the hole. Vwalla
or
2. Grind the damage doen to a flat and make the missing beice from a solid peice of alu then weld this on ??
Im a little belittled to which will be the strongest fix for the job ??
Help will be great
TIA Alan
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mad-butcher
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| posted on 17/5/11 at 05:38 PM |
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I would say 1, but if I could obtain the complete broken/missing piece off a set of holed cases I would say 2
(reasoning behind my way of thinking is the alloy would be like for like.)
Sorry not much help really
tony
[Edited on 17/5/11 by mad-butcher]
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BATHO
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| posted on 17/5/11 at 05:39 PM |
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Personally i think they would both be as strong as each other as long as you weld prep the aluminium block and engine case sufficiently and put down a
really good penetrating route run.
Just my two pence worth
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doddy
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| posted on 17/5/11 at 05:52 PM |
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i have a set of 919 crank cases you can have for free if there any good come with pitsons fitted you can cut the bit you need out or use for rebuild
let me know
https://www.ebay.co.uk/str/4x4wheels
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britishtrident
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| posted on 17/5/11 at 06:06 PM |
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Weld a lug on, the less heat the casting is exposed to the better. It would also be quicker.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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tompat3463
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| posted on 17/5/11 at 06:31 PM |
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ok thanks for all your advice.. and thanmks for the generous offer for the free cases...
I was maybe thinking just welding the lug on will be the best option and I think ill go with that ??
could anyone offer advice on which grade alu to use as a good match to the blade casing ??
TIa Alan
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907
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| posted on 17/5/11 at 06:53 PM |
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IMHO a repair on alluminium is seldom as strong as the original as the new lug (or weld metal)
will be in the annealed condition, together with the surrounding area of the casting.
Paul G
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nick205
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| posted on 17/5/11 at 06:54 PM |
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quote:
Originally posted by britishtrident
Weld a lug on, the less heat the casting is exposed to the better. It would also be quicker.
That would be my preference too - reduce the risk of further damage due to the amount of welding heat required.
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Peteff
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| posted on 17/5/11 at 06:54 PM |
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4043 is usually used for unknown or cast aluminium welding. Ask 907 Paul what he recommends.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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britishtrident
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| posted on 17/5/11 at 09:33 PM |
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To uncommon for fengines to be cast in hyper-eutectic aluminium silicon alloys rather than more conventional casting aluminium silcon alloys such
as LM3 and LM25
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tompat3463
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| posted on 22/5/11 at 10:30 AM |
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my firend came and had a look at the job this week and now is a bit scared of welding the block because he has never welded cast alu before ( thought
he had  ) .
is it jusy the same as weldind ordinary alu or is there a different method involved ??
also if I.m beat is there anybody in the northumberland kinda region that could do this for me ??
Many thanks Alan T
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