Quote:
Originally Posted by Dale M.
Unfortunately there is no such thing as "flame annealing"..... Only things one can do is heat object in flame so it has a uniform temperature then either garage it into a kiln at proper holding temperature then finish annealing cycle, or slow cool it in vermiculite or fiber blanket and batch anneal later..
Dale
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Hi Dale. You are correct in that "flame annealing" is best followed by kiln annealing, but there
is such a thing as "flame annealing".
Flame annealing doesn't substitute well for kiln annealing, because most people don't have the patience to take the extended time that proper flame annealing requires (sometimes and usually longer than it took the person to make the object in the first place), and kiln annealing provides a much more uniform distribution of heat.
(Supposedly the lampworkers in Lauscha, Germany only flame anneal the glass pens that they produce -- but I've only read this in one source, so it remains unconfirmed.)
Northstar Glass defines "Flame Annealing" as:
"Flame-annealing
A flameworking technique where the finished piece is reheated in a bushy, relatively cool flame to relax the stresses built up in it during the construction process. This is usually used only on small pieces and is generally regarded as a temporary measure for work that is to be properly annealed later on."
Links to "flame annealing" glass:
http://www.glassalchemyarts.com/supp...ng-Stress.html
8th paragraph down discusses flame annealing
http://www.public.asu.edu/~aomdw/GSI/Glass_Strain.html
In this article, it's referred to as "hand annealing"
http://collegian.ksu.edu/collegian/article.php?a=4435
http://www.public.asu.edu/~aomdw/ampoule/Page_3.html
http://www.guild.com/servlet/Guild/G...?firstLetter=F
There are many more links, too. These links were provided as a small sample to show that "flame annealing" does exist, and that it is a recognized and defined process by (most!) glassworkers. (
Except Dale. I'm just ribbing you because you said it doesn't exist when I'm sure you know it does but you just didn't want to give it as an option because it is totally impractical.
)