Johan Bornman Posted August 29, 2009 Posted August 29, 2009 It is not an either/or question. You'll be welding if you don't use lugs. If you use lugs, you'll braze or silver solder. Speaking of tubing - local commercially available tubing will be straight-gauge, whereas you want butted tubing. This is available in suitable lengths only from bicycle tubing suppliers. I cant remember where I bought mine from - a company in the UK. All I remember is that the company was so old-fashined, they still sent me a catalogue in the post. No website in those days for them. Google it, you'll find suppliers no doubt.
Pietman Posted August 29, 2009 Posted August 29, 2009 Awesome design, looks really fast. Would you take orders if the bike works?
EigerSA Posted August 29, 2009 Posted August 29, 2009 Butted tubing would be best, but since this is your first build, maybe just stick to the straight gauge, especially as you're welding for the first time! Butted tube has wall thickness that varies, so one end might be .8mm, mid way .5mm and the other end .8mm again. From a weight perspective the difference in a 600mm tube that's double butted or even triple butted I think would be negligible (spelling?). The only problem I came across was that the only tubing in South Africa I could source was round, whereas tubing supplied overseas could be purchased in an oval shape which is handy for chainstays and seat stays. I'm no metallurgist, but I don't think silver solder is strong enough for the stresses (I'm no expert with welding) TIG welding is the best way to go, just plan ahead properly and stick to the basics. There's a video on youtube of a guy TIG welding a mtb frame out in his backyard, very 'unproffessional' but it just proves that it can be done. Good luck!
HeartCoppi Posted August 29, 2009 Posted August 29, 2009 i must just somehow get this tubing .... anyone know places to get in gauteng (pretoria' date=' open to anything though)?? any aircraft or motor racing places??1 last Q: wich one would be better , TIG welding or silver soldering?[/quote'] Depends on the base material.TIG/WIG if you go for an alu constructionBrazing if you go steel and lugged silver soldering???? thats for electricians and refrigerationnormal solder like plumbers is a little different and known to be used.tarboy2009-08-29 10:02:55
javadude Posted August 29, 2009 Posted August 29, 2009 Lugged frames are soldered, not brazed. Go have a look on youtube for some framebuilding videos, pretty cool how its done.
Johan Bornman Posted August 29, 2009 Posted August 29, 2009 silver soldering???? thats for electricians and refrigerationnormal solder like plumbers is a little different and known to be used. I think you're mistaken.
HeartCoppi Posted August 29, 2009 Posted August 29, 2009 levels of ease IMOeasiest: lug frame with solder is flame and paste applied. Is a low heat input not actaully diluting into the base material of the tubing = least distortion. and can be dissembled again by applying heat with a torch. Brazing involves a copper- alu (CuAl) or CU-silicone (CuSi) It belongs to the welding process family applied by TIG/WIG or MIG/MAG. It is also fairly low temperature and is used commonly in automotive manufacture today on thin panel assembly. Also does not really dilute into the base material. TIG/WIG alu would be most difficult as a process. because of high temperatures and the melting/dilution of the base material. Higher teperatures would involve greater distortion.
Wyatt Earp Posted August 29, 2009 Posted August 29, 2009 Brazing if you go steel and lugged silver soldering???? thats for electricians and refrigeration normal solder like plumbers is a little different and known to be used. Could just be semantics and this is way out of my level of expertise, but I think brazing and silver soldering is considered to be the same thing.
Wyatt Earp Posted August 29, 2009 Posted August 29, 2009 forgot to add, as I understand higher temperatures get's used for brazing.
David #7 Posted August 29, 2009 Posted August 29, 2009 Brazing if you go steel and lugged silver soldering???? thats for electricians and refrigerationnormal solder like plumbers is a little different and known to be used. Could just be semantics and this is way out of my level of expertise' date=' but I think brazing and silver soldering is considered to be the same thing.[/quote'] Summit you are correct. Brazing uses a brass alloy rod and flux while silver solder uses a silver alloy rod and flux. but the proccess is the same.
Windbreaker Posted August 30, 2009 Posted August 30, 2009 and the temperatures required are very different
mpcombrink Posted August 30, 2009 Posted August 30, 2009 Good luck with the project ... would love to see the outcome.so when you're done... Carbon project?
CScriba Posted August 30, 2009 Author Posted August 30, 2009 i think ill be using fillet brazing....and after im done, i think ill retire haha so much effort trying to source aero/oval tubing, hat price would i look at paying for a Chrmoly 4130 tubeset? (can you get them in oval/aero shapes?)
HeartCoppi Posted August 31, 2009 Posted August 31, 2009 silver soldering???? thats for electricians and refrigerationnormal solder like plumbers is a little different and known to be used. I think you're mistaken. I think I'm so mistaken, that not even I can figure out what I actually meant to say here. Perhaps I just want to note that we are working in this case with a flame and flux, and not with soldering irons. Also that 100% silver for brazing is unusual and that it is usually alloyed with tin and lead amongst others.
CScriba Posted September 7, 2009 Author Posted September 7, 2009 bumpetty bump.....is oval/aero tubing available in SA?? or would something like that ave to be imported.....TT bike should atleat be a little aerodynamic!!!
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now