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PostPosted: Wed Jan 06, 2010 12:41 pm 
Retro Guru
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Joined: Thu May 08, 2008 4:18 pm
Posts: 2336
I wouldn't be using that myself, it's cracked nearly half way around the tube. The crack will only grow slowly up to a point - eventually there won't be enough material to hold the front on and it'll break suddenly. This is a common cause of "just riding along" breakages - the damage was already there, the frames just happen to let go during fairly innocuous riding.

It's not welding or heat that cracks frames, it's using them ;-)


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PostPosted: Wed Jan 06, 2010 8:13 pm 
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Joined: Thu Apr 17, 2008 3:05 pm
Posts: 320
Location: The West Riding of Yorks
If you strip the paint around the weld area, I'm pretty sure a decent welder with a Tig set could put you a wider bead over existing one for not a lot of money. But if it was mine I would park it up until repaired just in case.


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PostPosted: Fri Jan 08, 2010 11:03 pm 
North West Deputy AEC
North West Deputy AEC
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Joined: Sun Apr 15, 2007 8:10 pm
Posts: 1459
Location: Lancashire
If you have any doubt at all, I can't be sure from the photos, stick some fluid (lube) into the hole in the head tube through to the top tube and see if it comes out of the crack.

On a thin tube set like this i would always expect the tube to go before the weld esp with the quality of weld on most Parkpre s


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PostPosted: Fri Jan 08, 2010 11:23 pm 
West Midlands Deputy AEC
West Midlands Deputy AEC
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Joined: Sun Oct 18, 2009 7:30 pm
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Location: Suffolk
I am not convinced that is a crack - it looks like a pronounced edge at the weld toe - see:

http://www.weldguru.com/SMAWNomenclatureandJoints.html

ideally you would try and do a penetrant test on it (where you clean it, spray on a dye, leave it a while then wipe it off and then spray a developer on it. If there is a crack the dye will have been drawn into the crevice by capilliary action and then leach out and show up on the developer).

That will give you a definate answer rather than a bunch of people squinting at a blown up pic!!

If you want to give that a go let me know and I will see if there are any cans going spare at work (its pretty expensive stuff so you wouldn't want to have to buy it).

Cheers

Adrian


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PostPosted: Sat Jan 09, 2010 12:15 am 
Gold Trader / MacRetro rider
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Joined: Wed Aug 22, 2007 12:23 am
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Great advice, kaiser did the very dye test on my cracked dale which I then got fixed so would advise you to do the same.


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PostPosted: Fri Mar 12, 2010 11:56 pm 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
Posts: 6066
Location: Chester
Absolutly gutted. This project was never finished to how i wanted it due to constant budget constraits, so many things i wanted for it, but I used it nevertheless. I put that crack to the back of my mind and continued using it as it such a fun bike to ride, until today I decided to have another look. The crack has got longer and the worst bit, there is a hairline crack in the downtube section now as well.

So i've stripped it down this afternoon awaiting a day when i have a bit more of a budget :cry: :cry:

Here it is getting worse. I used touch up paint after chipping it before and it's clearly a crack behind the weld. This would be caused by local case hardening due to the heat of the original welding and it's exactly where you would expect a crack to be.

Second picture showing the new crack on the underside of the downtube.


Attachments:
File comment: Old crack getting worse
SNC13319.JPG
SNC13319.JPG [ 28.95 KiB | Viewed 622 times ]
File comment: New carck on downtube
SNC13320.JPG
SNC13320.JPG [ 31.36 KiB | Viewed 622 times ]


Last edited by Easy_Rider on Sat Mar 13, 2010 12:41 am, edited 1 time in total.
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PostPosted: Sat Mar 13, 2010 12:16 am 
Gold Trader
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Joined: Sat Aug 29, 2009 12:15 pm
Posts: 659
Location: Aberdeenshire
Just read your thread:

Holy shit - looks lika a crack to me. Dye pen might corfirm this. Local weld repair shoud be enough though.

Look like its worth it though - good luck with the project.


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PostPosted: Sat Mar 13, 2010 12:38 am 
Gold Trader / MacRetro rider
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Joined: Wed Aug 22, 2007 12:23 am
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Sorryto hear that that's a real bummer :cry:


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PostPosted: Sat Mar 13, 2010 1:23 pm 
Anglian Deputy AEC
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Joined: Mon Oct 09, 2006 6:13 pm
Posts: 6928
Location: Livin' in a dust bowl
That is a real shame. Get it repaired when you can.


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