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#619013 - 09/25/15 7:23 am Powder Coating a Brazed Frame  
Joined: Sep 2015
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Joel Greene Offline
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Joel Greene  Offline
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Georgia USA
I'm getting started on my Velocette restoration and thinking about powder coating the frame. I've read that the heat from the powder coating (around 375F) can damage the brazed joints on a frame,in some cases actually causing them to fall apart! 375F doesn't seem like it would be hot enough to cause this. Thoughts? Experiences? Thanks

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#619019 - 09/25/15 8:17 am Re: Powder Coating a Brazed Frame [Re: Joel Greene]  
Joined: Oct 2006
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Irish Swede Online content
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Irish Swede  Online Content
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Elburn, Ill. USA
Then don't powder coat it. Do what the factory did: paint it.

After all, you are doing a RESTORATION, correct?

#619029 - 09/25/15 9:21 am Re: Powder Coating a Brazed Frame [Re: Joel Greene]  
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AngloBike Online content
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AngloBike  Online Content
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UK Berks
I have hear the stories but doubt the truth

I have seen the parts go into a powder coater's oven, which is like a big storage container.
The guys just walk in and ( wearing gloves) move the stuff on rails or wheeled trollies.

the ovens do not get switched on, heat up, switched off and cool down, they just "bung them in" for a given period, or use a long slow moving production line if doing lots of parts

I doubt if it is anyway near melting brass,

Just ask the guys how hot it is

#619031 - 09/25/15 9:26 am Re: Powder Coating a Brazed Frame [Re: Joel Greene]  
Joined: Dec 2004
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kommando Online content
kommando  Online Content


Joined: Dec 2004
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Scotland
If the heat cannot affect rubber suspension sleeves its not going to affect brazing, the temp is not that high and its not for long either, just long enough for the powder to melt fuze and flow.

#619050 - 09/25/15 11:04 am Re: Powder Coating a Brazed Frame [Re: Joel Greene]  
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Zombie Offline
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Zombie  Offline
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Florida PanHandle
The rumors were centered around the differing expansion rates of the metals.

While I am not a fan of powder coating I have no need to support rumor. 375*f is NOT enough heat to expand metals to the fatigue point. Given a margin for error of +75* you are still in a safe zone.
I wouldn't worry until you were above 500*f for an extended period. I can say that I have never heard or read about a bike frame failure (welded or brazed) due to the powder coating process.
Welding or frame straightening... yes but not powder coating.

#619053 - 09/25/15 11:11 am Re: Powder Coating a Brazed Frame [Re: Joel Greene]  
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triton thrasher Online content
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triton thrasher  Online Content
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scotland
Originally Posted By Joel Greene
I'm getting started on my Velocette restoration and thinking about powder coating the frame. I've read that the heat from the powder coating (around 375F) can damage the brazed joints on a frame,in some cases actually causing them to fall apart! 375F doesn't seem like it would be hot enough to cause this. Thoughts? Experiences? Thanks


It's Velocette forks that fall to bits when heated. The ends are soldered to the sliders.


Amateur Loctite enthusiast.
#619066 - 09/25/15 12:12 pm Re: Powder Coating a Brazed Frame [Re: triton thrasher]  
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Joel Greene Offline
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Joel Greene  Offline
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Posts: 13
Georgia USA
Originally Posted By triton thrasher
Originally Posted By Joel Greene
I'm getting started on my Velocette restoration and thinking about powder coating the frame. I've read that the heat from the powder coating (around 375F) can damage the brazed joints on a frame,in some cases actually causing them to fall apart! 375F doesn't seem like it would be hot enough to cause this. Thoughts? Experiences? Thanks


It's Velocette forks that fall to bits when heated. The ends are soldered to the sliders.


Ah! This I believe is the answer. I did read in 2 different British publications to avoid "stove enameling" of the forks. Now I know why. Thanks

#620308 - 10/03/15 1:05 pm Re: Powder Coating a Brazed Frame [Re: Joel Greene]  
Joined: Aug 2015
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Marc Offline
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Marc  Offline
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Dawsonville,Ga. USA
I am a professional powder coater and can tell you the heat required for coating in no way will negatively effect the brazed frame. The temp of the part metal (PMT, part metal temp) needs to get to 400*f (not the oven temp) for 10 minutes to cure properly. The melting point of brass/bronze is 1600-1660*F, much higher than the powder curing temps.


Moderated by  Alan_nc 


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