mic Posted July 6, 2014 Report Share Posted July 6, 2014 (edited) I was going to change the airbox on my bike today since it ws damaged, and when i cleaned some hard to reach places on the frame while having the airbox detached i found two really big cracks under the rubber protector on the upper rearshock mount, see picture. I had to zoom in to make the cracks visible since the frame is black, but it is identical on both sides of the shockmount, and the picture is tilted 90 degrees, but i hope you can make out the location anyway, i can always upload another picture if not. Obviously i need to fix this, but what mehod of welding would you guys recommend, and what material is the frame made of? Is it chromoly?Should i try to reinforce it or just weld the cracks together after stripping the paint and cleaning them up? Edited July 6, 2014 by mic Quote Link to comment Share on other sites More sharing options...
monty_jon Posted July 6, 2014 Report Share Posted July 6, 2014 Might be better getting a second hand frame? Quote Link to comment Share on other sites More sharing options...
t-shock 250 Posted July 6, 2014 Report Share Posted July 6, 2014 Then he'll have 2 to repair! 1 Quote Link to comment Share on other sites More sharing options...
robbierich Posted July 6, 2014 Report Share Posted July 6, 2014 Get it braised, and it will be fine. Just clean the paint off and v the crack out slightly and take it to your welder a Quote Link to comment Share on other sites More sharing options...
copemech Posted July 7, 2014 Report Share Posted July 7, 2014 Chromoly, yes, Mig or Tig will do it, find a good welder! Quote Link to comment Share on other sites More sharing options...
canada280i Posted July 7, 2014 Report Share Posted July 7, 2014 try to find out what caused it as well so it does not happen again. maybe get some bracing over the cracks. It looks like a stress crack caused by the lugs holding the top of the shock Quote Link to comment Share on other sites More sharing options...
dadof2 Posted July 7, 2014 Report Share Posted July 7, 2014 Either get it brazed or get it TIG welded with dissimilar (Armoid?) metal filler. The cracks are probably due to residual stress from the original welds. Quote Link to comment Share on other sites More sharing options...
guys Posted July 8, 2014 Report Share Posted July 8, 2014 If you look closely to the welds, you can see that it's bad welding that's the problem ( the welds are too far to one side) My Bultaco has the same bad welding, so not much has changed over the years. 1 Quote Link to comment Share on other sites More sharing options...
mic Posted July 19, 2014 Author Report Share Posted July 19, 2014 Thanks for the feedback, I have found a guy that is a licensed welder after talking to my local bikeshop. He will weld it next week, can't wait to get it back so I can ride again? 1 Quote Link to comment Share on other sites More sharing options...
mic Posted July 30, 2014 Author Report Share Posted July 30, 2014 (edited) Now it's fixed, the guy who did it used tig to patch things up, looked alright to me and I'm happy to have a working bike again. Edited July 30, 2014 by mic Quote Link to comment Share on other sites More sharing options...
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