Go Back  Bike Forums > Bike Forums > Framebuilders
Reload this Page >

Cracked Ti frame

Notices
Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Cracked Ti frame

Old 04-21-10, 10:37 AM
  #1  
TrueBeliever
bs
Thread Starter
 
Join Date: Jan 2008
Posts: 43

Bikes: all of them

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Cracked Ti frame

A friend of mine gave me a Ti frame. there is one crack on the chain stay. Talking with a couple Bike mechanics, half say it's repairable, the other half say to move on.
Is this worth fixing? any idea on who could do it?

Last edited by TrueBeliever; 04-21-10 at 02:10 PM.
TrueBeliever is offline  
Old 04-21-10, 11:08 AM
  #2  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 19,886
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 415 Times in 318 Posts
your attachment is never going to work for anyone but you because it's in your gmail account. You need to post it somewhere like picassa or photobucket
unterhausen is offline  
Old 04-21-10, 12:10 PM
  #3  
TrueBeliever
bs
Thread Starter
 
Join Date: Jan 2008
Posts: 43

Bikes: all of them

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by unterhausen View Post
your attachment is never going to work for anyone but you because it's in your gmail account. You need to post it somewhere like picassa or photobucket
I'm a jackass
TrueBeliever is offline  
Old 04-21-10, 02:03 PM
  #4  
NoReg
Banned
 
Join Date: Aug 2005
Posts: 5,115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times in 1 Post
That's the seat stay? Looks like the chainstay at the BB. Anything can be rewelded or splinted and rewelded. If it is the seat stay, then it should be OK because it is under compression. A Chainstay would possibly require some patching as well. Could get tight depending on what else is happening in that space. Other options are tube replacements. I don't know what people charge for that, but it is non-trivial, and I would have thought unless the frame is exceptional it would not be worth it.

Ti welding is a specialty, so you need to find someone who would be able to do it on bike tubes, won't be against doing it, and won't have their time taken up already, and works cheaply, preferably locally.

There is also the question of what broke it, and what else was cranked up in the process.
NoReg is offline  
Old 04-21-10, 06:12 PM
  #5  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 19,886
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 415 Times in 318 Posts
looks like it started at that reinforcement. Hard to know if a repair would work, it's conceivable given a good enough welder.
unterhausen is offline  
Old 04-22-10, 06:10 AM
  #6  
Falanx
THE Materials Oracle
 
Falanx's Avatar
 
Join Date: Feb 2006
Location: Finally... home :-)
Posts: 502

Bikes: Univega Alpina 5.1 that became a 5.9, that became a road bike... DMR TrailStar custom build

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Peterpan1 View Post
That's the seat stay? Looks like the chainstay at the BB. Anything can be rewelded or splinted and rewelded. If it is the seat stay, then it should be OK because it is under compression. A Chainstay would possibly require some patching as well. Could get tight depending on what else is happening in that space. Other options are tube replacements. I don't know what people charge for that, but it is non-trivial, and I would have thought unless the frame is exceptional it would not be worth it.

Ti welding is a specialty, so you need to find someone who would be able to do it on bike tubes, won't be against doing it, and won't have their time taken up already, and works cheaply, preferably locally.

There is also the question of what broke it, and what else was cranked up in the process.
You left out the ugliness that is, basically, transversely weldign a tube.

As much as I hate to see a frame die, short of removing the whole tube and welding another back in - and that'd be the Devil's own game, I'd conduct a short service for family and friends, and then sell it on to a speciality metals recycler to be reborn as a hundred thousand other little titanium goodies.

Recycling. It's the only Reincarnation :-D
Falanx is offline  
Old 04-22-10, 08:15 AM
  #7  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 21,547

Bikes: Several, mostly not name brands.

Mentioned: 125 Post(s)
Tagged: 0 Thread(s)
Quoted: 2174 Post(s)
Liked 542 Times in 373 Posts
It looks like the welder undercut the tube when laying down the bead. You could try building it up again but my suspicion is that it will eventually fail again. If other joints are similarly undercut I'd scrap the thing.
JohnDThompson is offline  
Old 04-22-10, 03:43 PM
  #8  
NoReg
Banned
 
Join Date: Aug 2005
Posts: 5,115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times in 1 Post
"You left out the ugliness that is, basically, transversely weldign a tube."

Yeah, no question about that. But it's a second hand bike with a broken stay, gotta take a haircut somewhere. Also, as a tourer, it's the kind of question that could come up in that context. But it isn't going to look like new.
NoReg is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
stringmaster
Framebuilders
13
07-04-19 01:00 PM
mnfl
Framebuilders
5
10-27-17 09:08 AM
ruirui
Framebuilders
10
11-03-14 06:37 PM
bilbo69
Bicycle Mechanics
14
05-29-14 10:45 AM
gaucho777
Framebuilders
3
05-26-13 08:07 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.