is a propane torch hot enough to desolder steel?
is a propane torch hot enough to desoder the solder holding together steel? TIA |
wtf is TIA? anyways if i had to guess no, propane torches work for plumbing and copper.
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Originally Posted by exas
topic
TIA |
If you are talking about 'brazing'... then maybe. Brass, hell no. Silver, possibly. Might as well get a cheap oxy/mapp torch from the big box if you are removing braze-ons (my guess as to why you asked the question).
TIA = Thanks in advance. |
De-solder - yes.
De-braze - probably not. |
Originally Posted by FlatFender
De-solder - yes.
De-braze - probably not. |
Originally Posted by exas
whats the difference between the two? (never did anything like this before)
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Originally Posted by redirekib
Hey feller, ya'll got indoor plummin'? Iffin' ya do, sodder's that shiny, silver lookin' stuff a holdin' yer pipes together. Brazin's a deffer'nt lookin stuff, more brass a lookin, and ya ain't a gunna' melt that stuff with no propain burnin' torch.
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Originally Posted by exas
i wouldn't be able to tell, there is paint over the solder joints, i guess i could scratch it off and see if it is silver.... but what do they use to solder steel together anyways?
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The solder metal together with.... solder. Solder is sometimes lead, or a lead/tin alloy, or sometimes with no lead.
I promise your bike has no solder on it. Steel bikes are brazed. brazing is a bit different than soldering. Brazing can be done with many different metals, mostly brass. http://en.wikipedia.org/wiki/Brazing |
Exas, it's one of those issues that if you have to ask, you may be doing something you shouldn't without a LOT more research.
What exactly are you trying to "desolder"? Old bike frames (or new if they're Old School like Rivendell or handbuilts) are typically silver soldered or brass brazed, but even with silver the process is referred to as brazing. Either process is a somewhat refined art (not saying you can't do it, just saying that to do it well takes knowledge and skill to make a joint safe enough to ride) and if you're stuck on torch type, you have a lot to learn yet. Here is a good place to start. |
Originally Posted by exas
whats the difference between the two? (never did anything like this before)
Low temp Silver Solder is used by plumbers on copper pipes often with propane, what is often referred to as Silver Solder in high end bike tubes is actually Silver Braze and it requires a higher temperature to work. Propane will put too much heat into the steel before it has any effect on the weld metal. |
Heating the steel instead of the silver brazing material would probably have a deterimental effect on the steel, not to mention the paint job.
torgrot |
What kind of bike is held together with solder? aren't they brazed or welded?
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Originally Posted by exas
is a propane torch hot enough to desoder the solder holding together steel?
TIA |
I tried removing braze-ons when doing my single speed conversion and can assure you my propane torch would not remove brass brazed braze-ons. (Silver I haven't tried) Get out the hacksaw and grinder if that's what you're trying to do.
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Originally Posted by skingry
If you are talking about 'brazing'... then maybe. Brass, hell no. Silver, possibly. Might as well get a cheap oxy/mapp torch from the big box if you are removing braze-ons (my guess as to why you asked the question).
Brazing is brass. |
Originally Posted by rmfnla
Brazing is brass.
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Originally Posted by FlatFender
or silver, or a few other alloys.
Brass is an alloy. If you are using some other alloy it isn't brazing (what other alloys do you have in mind?). |
Originally Posted by rmfnla
Silver is solder; stronger than lead/tin but still considered solder.
Brass is an alloy. If you are using some other alloy it isn't brazing (what other alloys do you have in mind?). |
I built whole bike using just a simple torch (no oxigen). For silver I could use propane, but for brass I had to use MAPP gas to get enough heat. I would not, however, recommend brazing of key components of the frame or fork to anyone without some practice/experience. Simple braze-ons for bottles or racks should be o.k., but I would stay away from forks. Henry James sells practice parts and can be a great source of particular advice (or alternatelly the guys on "Framebuilders" forum).
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