Retrobike Forum Index

It is currently Mon Dec 05, 2016 1:58 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 42 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next
Author Message
 Post subject:
PostPosted: Tue Feb 28, 2006 6:35 pm 
BoTM Winner
BoTM Winner
User avatar

Joined: Sun Oct 23, 2005 7:22 pm
Posts: 742
Location: Wooster, Ohio
Hmm, I'm no physics engineer but I'm a reputable and certified TI welder and I would NOT use a scabbed together steerer :roll:

But then again, maybe I'm just fluffed in the head.

rody


Top
 Profile  
 
 Post subject: ti welding
PostPosted: Tue Feb 28, 2006 7:48 pm 
Retro Guru

Joined: Tue Sep 27, 2005 8:52 pm
Posts: 546
Location: South West
Sorry bit of a digression here , although ti related

Rody, with your welding experience... a question for you possibly?

I've got a ti frame on which a weld on the driveside of the chainstay had cracked pretty much all the way round - but am reluctent to get it repaired because have little faith left in the weld on the non driveside not developing a similar crack...is it possible to reinforce / reweld something that hasn't broken yet -or is that just plain daft?


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 28, 2006 10:17 pm 
BoTM Winner / retrobike rider
BoTM Winner / retrobike rider
User avatar

Joined: Wed Nov 23, 2005 2:34 pm
Posts: 1836
Location: Wellington, New Zealand
I too thought the track 2's were recalled after a problem with them...was that all sorted out?...they look well sweet!

Rich


Top
 Profile  
 
 Post subject:
PostPosted: Wed Mar 01, 2006 9:16 am 
Retro Guru
User avatar

Joined: Sun Sep 11, 2005 9:50 pm
Posts: 389
They were all recalled. There was a problem with the legs becoming loose in the crown. I am sure this only affected the Mk1 or Mk2 and not both but cannot remember which. This is why they are so hard to come by.

Ride or not to ride? That is the question? Probably build as a garage queen!


Top
 Profile  
 
 Post subject:
PostPosted: Wed Mar 01, 2006 9:52 am 
BoTM Winner
BoTM Winner

Joined: Thu Jan 19, 2006 1:23 pm
Posts: 2763
Location: NW England
Rody - Interesting to hear that from someone who is actually qualified to make a judgement! JOOI why wouldn't you ride 'em? I would think there would be a lot more stress on the crown/steerer weld than halfway up the steerer but I have no expertise whatsoever :?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Mar 03, 2006 3:53 am 
BoTM Winner
BoTM Winner
User avatar

Joined: Sun Oct 23, 2005 7:22 pm
Posts: 742
Location: Wooster, Ohio
steve and tangent, here's the rub with TI,

to weld TI you must be meticulously clean, have strict attention to preventing weld puddle contamination, and MUST purge both the inside and outside of the tube to create an inert (read oxygen free) weld zone. Anything less than perfection is sure to result in fractures at the point of contamination due to the molecular structue becoming brittle and less ductile.

Common errors in welding TI include imperfect pre-cleaning, tungsten contamination, moving too fast (outrunning shield gas), improper torch angle (gas not shielding area appropriately), and lack of inert gas due to improper purging.

Sooo, given this info...

I would not reweld the chainstay as it would be impossible to clean the interior of the tube sufficiently and purging would also be an issue. If you would try, with much riding, the weld zone would likely fracture again. As for the other side...the tensile strength and ductility of TI is awesome when joined correctly, unforgiving when not. Hard riding will seldom cause a failure (could...) but more likely if one side failed, it is likely the other will as well.

Steve, these concepts also illustrate why riding a copped steerer tube is NOT a good idea. Even with a lap butt, too much probability is present in inability to prepare the tubing and shield the lap during welding to meet my expectations of a strong joint. I'm not going to send someone out on my work unless I'm confident they'll bust their ass before my fork :P .

Hope this helps...

rody


Top
 Profile  
 
 Post subject:
PostPosted: Fri Mar 03, 2006 9:21 am 
Old School Grand Master
User avatar

Joined: Tue Jul 05, 2005 3:14 pm
Posts: 13403
Location: Warwick
You are awesome Rody. Brilliant stuff.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Mar 03, 2006 9:48 am 
BoTM Winner
BoTM Winner

Joined: Thu Jan 19, 2006 1:23 pm
Posts: 2763
Location: NW England
Great reply thanks Rody.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Mar 03, 2006 10:54 am 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
User avatar

Joined: Wed Oct 05, 2005 7:45 pm
Posts: 10942
Location: kent
A true pro .


Top
 Profile  
 
 Post subject: Ti Weilding
PostPosted: Fri Mar 03, 2006 2:01 pm 
Retro Guru
User avatar

Joined: Sun Sep 11, 2005 9:50 pm
Posts: 389
Can't really argue with that. I'm convinced!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 42 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group