The master welder has very good control of his torch,that's impressive. So much work goes into a custom steel frame,and nothing is fine that a columbus tube steel machine!
The hiss of the torch seems to blend well with the spa music, reflecting perhaps the Zen state of mind of the master brazer… insightful video! DanielChua
Absolutely amazing work. I have a question though! I can see your using an inline gas fluxer. Why are you still adding flux to the joints? I have TIG brazed a lot over the almost 20 years I've been a fabricator but have never had the pleasure to really do much gas welding. I've got everything in the shop to do gas welding and brazing but I mainly use torches for a rosebud to bend metal or do preheat before welding so excuse my ignorance of a true art!
The tip of your torch looks like what is called a “rosebud” in the USA, except yours would be a miniature version. I used a slightly larger tip installing cryogenic liquid and gas systems; all copper, brass, and stainless steel as carbon steel is brittle at cryogenic temperatures. The filler metal I used was either 5% Silver Alloy or 50% Silver alloy. Gas welding is a very satisfying process especially watching the filler metal following the heat of the torch. Darlington, South Carolina USA
Very cool (well, hot, I guess)!! Does the heat of the torch have to be kept to a temperature low enough so as not to impact the integrity of the steel? Can you do a follow up video showing how the dropouts are brazed to the seat and chainstays? Really enjoyed this.
I think, he had made pre assembling in a jig. I usually braze outer sides of lugs in a jig. Then I check it on the table and braze once more to let the silver or brass to flow inside the lug without jig. But I don't make all frame at once, only front triangle and chain stays.
Definitely seems to be too hot for silver. Interesting that he doesn't pull the brazage all the way through but goes in from each edge of each joint. ie inside and outside.
How important is not overheating the steel if you're using air hardened steel? I don't understand why it is so important to not overheat the steel if you can also TIG weld it without issue.
@@eurobeatmachinist732 I've since answered my own question I suppose, as I've been brazing steel frames. The flux used for brazing also prevents oxidation, but that doesn't have anything to do with the reduction in hardness and tensile strength that can occur when brazing. That has more to do with how long the metal is heated, how many heat cycles, and how slowly it cools. Smaller fillets are apparently better for preventing this weakening. Also, the air hardening steel bike tubing (such as Velospec) should be better at not losing hardness and tensile strength.
"Flux", which FLOWS, it turns into glass actually... a bunch of molten oxides, so the metal oxides you're generating dissolve into the flux, see? Then the brazing alloy can touch the base metal, and wet it, and there you are!
i braze too. this guy is using far too much flux. if the metal was really clean only a small amount would do, there is another video on youtube of a guy brazing bike frames without flux. i agree with the comment on the torch tip, the wrong one, it looks like a small rosebud rather than a brazing tip
![How a FILLET-BRAZED custom steel FRAME is made [Behind a Custom Steel Bike]](http://i.ytimg.com/vi/uB54TQ2jQME/mqdefault.jpg)
The master welder has very good control of his torch,that's impressive. So much work goes into a custom steel frame,and nothing is fine that a columbus tube steel machine!
Hey Stephen, glad you like our Master's work! There's a massive amount of work behind building and finishing a custom steel frame.
The hiss of the torch seems to blend well with the spa music, reflecting perhaps the Zen state of mind of the master brazer… insightful video! DanielChua
Capolavoro! Si vede tecnica, esperienza e soprattutto un immenso amore per quello che fa. Impressionante.
Grazie Simone! È proprio così 🇮🇹
Absolutely amazing work. I have a question though! I can see your using an inline gas fluxer. Why are you still adding flux to the joints? I have TIG brazed a lot over the almost 20 years I've been a fabricator but have never had the pleasure to really do much gas welding. I've got everything in the shop to do gas welding and brazing but I mainly use torches for a rosebud to bend metal or do preheat before welding so excuse my ignorance of a true art!
The tip of your torch looks like what is called a “rosebud” in the USA, except yours would be a miniature version. I used a slightly larger tip installing cryogenic liquid and gas systems; all copper, brass, and stainless steel as carbon steel is brittle at cryogenic temperatures. The filler metal I used was either 5% Silver Alloy or 50% Silver alloy. Gas welding is a very satisfying process especially watching the filler metal following the heat of the torch. Darlington, South Carolina USA
My frame would be british racing green ang high polish alloy components
Artistry!
Columbus or reynolds which is best
Shouldent you protect the threading .Or is it pressfit?
Mükemmel kontrol,Usta
Una obra de arte. Cumplimenti a voi.
Muchas gracias!
Very cool (well, hot, I guess)!! Does the heat of the torch have to be kept to a temperature low enough so as not to impact the integrity of the steel? Can you do a follow up video showing how the dropouts are brazed to the seat and chainstays? Really enjoyed this.
Correct, heat control is crucial to preserve the tubing's properties. Glad you enjoyed this, we'll do more videos like this for sure!
uma bela obra de arte ta de parabéns..like ai pra fortalecer e vim mais videos como esse
Poderiam me dar a oportunidade de um visto de conheçer a Italia e a oficina.
Magnífico! 👏🏻
Grazie! 🇮🇹
What welding is this ?
Silver brazing with an inline fluxer and paste flux on the joints.
I assume he's brass-brazing and any idea what gas he's using? And it looks like he's done this before!
I think, he had made pre assembling in a jig. I usually braze outer sides of lugs in a jig. Then I check it on the table and braze once more to let the silver or brass to flow inside the lug without jig. But I don't make all frame at once, only front triangle and chain stays.
Definitely seems to be too hot for silver. Interesting that he doesn't pull the brazage all the way through but goes in from each edge of each joint. ie inside and outside.
Correct, it's brass-brazing!
@@OfficinaBattaglin Which grade of brazing brass is popular in Europe for bicycle frames?
@@biggirlbathingsuits8210 it depends on the builder.
How important is not overheating the steel if you're using air hardened steel? I don't understand why it is so important to not overheat the steel if you can also TIG weld it without issue.
With tig you have the gas preventing oxidation and the metal becoming bad.
@@eurobeatmachinist732 I've since answered my own question I suppose, as I've been brazing steel frames. The flux used for brazing also prevents oxidation, but that doesn't have anything to do with the reduction in hardness and tensile strength that can occur when brazing. That has more to do with how long the metal is heated, how many heat cycles, and how slowly it cools. Smaller fillets are apparently better for preventing this weakening. Also, the air hardening steel bike tubing (such as Velospec) should be better at not losing hardness and tensile strength.
Do you sell your lugs for large diameter tubes?
No, we developed them for our frames.
What is a white cream??
"Flux", which FLOWS, it turns into glass actually... a bunch of molten oxides, so the metal oxides you're generating dissolve into the flux, see? Then the brazing alloy can touch the base metal, and wet it, and there you are!
Saluti,,,,,ho una bicicletta Battaglia del 88. Offrite restauro per adattare campagnolo 11 record velocità vernice, decalcomanie ecc ecc. grazie….
А почему пламя зеленое?
It’s a special type of fuel gas to avoid overheating the tubes.
Dicerto é calibrado isso aí depois né,fica tudo torto
bonfire meditation)
looks more like silver soldering to me ....
i braze too. this guy is using far too much flux. if the metal was really clean only a small amount would do, there is another video on youtube of a guy brazing bike frames without flux. i agree with the comment on the torch tip, the wrong one, it looks like a small rosebud rather than a brazing tip