superstar Posted November 9, 2006 Report Share Posted November 9, 2006 Hi Does anyone know the going rate for welding a cracked frame.I realise that every crack will be different so i am just after people who have had welding work done and have realisetic prices.Also is it worth the hassle etc etc?thanks a lot Quote Link to comment Share on other sites More sharing options...
Broomer Posted November 9, 2006 Report Share Posted November 9, 2006 (edited) a mate had his frame welded and the welding company did it for free i think, im not sure how much some one would chargeoh and is it the right hand chain stay rite by the bb? Edited November 9, 2006 by Broomer Quote Link to comment Share on other sites More sharing options...
Mike W Posted November 9, 2006 Report Share Posted November 9, 2006 Hi Does anyone know the going rate for welding a cracked frame.I realise that every crack will be different so i am just after people who have had welding work done and have realisetic prices.Also is it worth the hassle etc etc?thanks a lothey im pretty sure most industrial estates will have someone that welds alloy i dont think its too expensive something areound 10-15 quid mike Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted November 9, 2006 Report Share Posted November 9, 2006 i advise heat treating too. Quote Link to comment Share on other sites More sharing options...
superstar Posted November 9, 2006 Author Report Share Posted November 9, 2006 i advise heat treating too.hi can you explain a little bit more about heat treatment please mate and why you sya its importantcheers Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted November 9, 2006 Report Share Posted November 9, 2006 well heat treating typically happens after the frame is built. Bascially it involved heating the entire, welded frame in an oven to a particular temperature. At certain temperatures the molecular structure of materials changes. At this point you can either let it cool down naturally, which allows the molecular structure to go back to pretty much the way it was, or you can cool it down quickly, which will "freeze" the molecular structure in a particular arrangement.In the case of aluminium and steel and probably many other things, this rapid cooling will make the material harder, more resistant to deformation, scratching or denting, but will also make it more brittle and less able to absorb vibration or shock without fracturing. Consider the difference between wood and glass. Glass is hard, but brittle. Wood is soft, but doesn't shatter (it's not brittle). This is what heat treating is generally about.For instance I had an aluminium frame modified - I had a disc tab welded onto it. The tab was plenty strong, and wasn't about to crack, but as it wasn't heat treated after the modification, the new material was soft and it deformed with the pressure of the disc brake and the bolts holding the brake on. This sort of deformation is almost never seen on correctly heat-treated frames - they fracture or crack instead Quote Link to comment Share on other sites More sharing options...
superstar Posted November 9, 2006 Author Report Share Posted November 9, 2006 cheers 'ash-kennard'i will keep that in mind buddy.very well explainedeasily understood.i have lined up a beat up levelboss for a good price.(fingers crossed)i wanted to find out if the repairs would out weight the cost of the beat up frame.thanks for all the posts so far. Quote Link to comment Share on other sites More sharing options...
Broomer Posted November 9, 2006 Report Share Posted November 9, 2006 ash kernard seems to know his stuff, but my mate had his level boss reweleded on the plate between the bb and the stay and he didn't heat treat it and its still going strong after more than a year.hope this helps Quote Link to comment Share on other sites More sharing options...
superstar Posted November 9, 2006 Author Report Share Posted November 9, 2006 3 cracks i will need sorting:1. underneath head tube (important)2. hairline crack on one of the rear brake mounts (a must i think)3. sump guard mounting (no so important if i run a bash ring??)this frame has been welded already in the same spot as your mates has so i see it may be a common problemi hope the head tube crack is not common, or at least let your mate no about ti so he can check it out.thanks again Quote Link to comment Share on other sites More sharing options...
La Bourde Posted November 9, 2006 Report Share Posted November 9, 2006 Take a look at this pic:http://img180.imageshack.us/my.php?image=f...otgauchefe7.jpg Sorry.. Quote Link to comment Share on other sites More sharing options...
superstar Posted November 10, 2006 Author Report Share Posted November 10, 2006 now thats a crack mate.i see the frame has cracked just behind a repair.maybe thats where the 'HEAT TREATMENT' someone mentioned mite of helped.unless u just had a monster fallthanks for the pic Quote Link to comment Share on other sites More sharing options...
darrenhopper Posted November 10, 2006 Report Share Posted November 10, 2006 That's a pretty nasty crack man,How bent out of shape is the rest of the frame? If the whole thing is as bandy as it looks in the photo I wouldn't hold up much hope for it surviving more than a month once re-welded. Most trials frames suffer from micro-fractures at high-stress points & I reckon if you do re-weld the head tube area & plate it, all it will do is shift the stress point further down the tube. If it doesn't try to snap between the two plates.I had my old frame (Saracen) re-welded a few times & all it really did was move the cracks further down the frame. As for price, if you can manage to get chatting with the guy doing the work it can work out alot cheaper... Especially if he shows an interest. Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted November 10, 2006 Report Share Posted November 10, 2006 (edited) ash kernard seems to know his stuff, but my mate had his level boss reweleded on the plate between the bb and the stay and he didn't heat treat it and its still going strong after more than a year.hope this helpscopy+paste= ash-kennard having god-like knowledge Edited November 10, 2006 by ash-kennard Quote Link to comment Share on other sites More sharing options...
Andeee Posted November 10, 2006 Report Share Posted November 10, 2006 www.quibellfabrications.co.uk Quote Link to comment Share on other sites More sharing options...
Wright Pads Posted November 13, 2006 Report Share Posted November 13, 2006 Some steels need a heat treament after being weled be it tig, mig, braze! Mainly 835 etc from Renyolds!All alluminum need a T6 @ least heattreament phase after any hot works on the frame!I looked a long time ago when i had my roll cage built or my car by a local shop. Nearly £600 for 45 mins of T6!Thats why frames are done in batches of hundereds and all done at same time! Quote Link to comment Share on other sites More sharing options...
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