Question about headtube weld gone wrong?- Mtbr.com
Results 1 to 7 of 7
  1. #1
    mtbr member
    Reputation:
    Join Date
    Apr 2011
    Posts
    174

    Question about headtube weld gone wrong?

    Injust wanted to get an opinion on a headtube weld of a minor frame manufacturer - not a question about beauty, but rather if this marks a weak spot and is prone to failure in the future since some of the headtube was taken away and is thinned out.
    Question about headtube weld gone wrong?-img_6092.jpg

  2. #2
    Location: 10 ft from Hell Moderator
    Reputation: life behind bars's Avatar
    Join Date
    May 2014
    Posts
    4,159
    That's nuthin to worry about. The weld could have been better but note that the filler material backs up most of the area in question. My two cents.
    "These things are very fancy commuter bikes or really bad dirt bikes, but they are not mountain bikes." - J. Mac

  3. #3
    mtbr member
    Reputation:
    Join Date
    May 2011
    Posts
    119
    I agree 100% with Life behind bars.

  4. #4
    Student of the Bike
    Reputation: CBaron's Avatar
    Join Date
    May 2004
    Posts
    735
    As a former frame builder and also bike shop owner, I'd say that this is probably nothing to worry too much about. I'd have zero problems riding it myself. However, I have seen a few frames with a head tube 'split' from pressing in a headset that was not in properly straight, or might be a tad on the over-size. In other words, your scenario could result in a HT that could 'yield' a bit and not hold a HS properly. So I would keep an eye out on it.

    Later,
    CJB

    I've personally seen this kind of fracture at least 2x's
    Question about headtube weld gone wrong?-dsc_5883.jpg

  5. #5
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Posts
    4,586
    Quote Originally Posted by CBaron View Post
    As a former frame builder and also bike shop owner, I'd say that this is probably nothing to worry too much about. I'd have zero problems riding it myself. However, I have seen a few frames with a head tube 'split' from pressing in a headset that was not in properly straight, or might be a tad on the over-size. In other words, your scenario could result in a HT that could 'yield' a bit and not hold a HS properly. So I would keep an eye out on it.

    Later,
    CJB

    I've personally seen this kind of fracture at least 2x's
    That is a completely unrelated failure.

  6. #6
    mtbr member
    Reputation:
    Join Date
    Jul 2006
    Posts
    377
    Quote Originally Posted by customfab View Post
    That is a completely unrelated failure.
    Unrelated and very alarming. I would never ride or advise anyone rides a bike that had a crack anywhere on it, especially the head tube.

  7. #7
    mtbr member
    Reputation: MikeDee's Avatar
    Join Date
    Nov 2004
    Posts
    1,894

    Question about headtube weld gone wrong?

    Quote Originally Posted by MindPatterns View Post
    Injust wanted to get an opinion on a headtube weld of a minor frame manufacturer - not a question about beauty, but rather if this marks a weak spot and is prone to failure in the future since some of the headtube was taken away and is thinned out.
    Click image for larger version. 

Name:	IMG_6092.jpg 
Views:	172 
Size:	47.7 KB 
ID:	1138876
    That's a weld/workmanship defect known as undercut where the weld bead cuts into the parent material at the edge of the weld reducing the thickness of the base metal. It does reduce strength but I don't think it will cause a problem though.
    Last edited by MikeDee; 07-14-2017 at 12:56 PM.

Similar Threads

  1. Steel 29er frame crack--to weld or not to weld?
    By pinetree in forum General Discussion
    Replies: 13
    Last Post: 08-21-2016, 01:22 PM
  2. Gone. My Love is Gone
    By imdickie in forum California - Socal
    Replies: 25
    Last Post: 11-28-2014, 11:41 AM
  3. Rust : what to use to get it gone / keep it gone !
    By Ronald Brown in forum Tooltime
    Replies: 4
    Last Post: 09-01-2014, 05:04 PM
  4. CHUMBA Forum, Wheres it gone? Here yesterday, gone today?
    By Tone's in forum General Discussion
    Replies: 16
    Last Post: 01-08-2013, 03:05 PM
  5. Aluminum Frame: To weld or not to weld, that is the question!
    By Single Trak Mind in forum General Discussion
    Replies: 20
    Last Post: 08-14-2012, 09:31 AM

Members who have read this thread: 1

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT MTBR

VISIT US AT

© Copyright 2019 VerticalScope Inc. All rights reserved.