WTF is Annealing Wire, and Why?
Annealing refers to altering the workability of metals by heating them up to extremely high temperatures and then cooling them, either rapidly – as in exposing it to water – or slowly, by exposure to air.
When I anneal wire prior to wrapping a coil, I have several goals in mind. First and foremost, I find that pre-torching the wire helps to speed up the process of working out hot spots. When I work out hot spots by pulsing the coil, I am essentially getting the system I’ve built ‘used to’ having electricity flowing through it. Combining a properly constructed wick with annealed wire, achieved with two laps of the torch along the wire length, I have found that the process of pulsing afterwards is much quicker.
The second reason I choose to anneal wire is to reduce its ductility/increase its malleability. Put simply, the process yields a coiling wire that is less prone to ‘springing’ out of place, and which will retain its shape around the wick once wrapped and secured. I find the reduction in springiness most helpful when dealing with wire gauges 29 and above, as the thinner the wire is, the more it is likely to misbehave where behavior counts
I can’t stress enough that two brief laps around the wire with a torch is entirely sufficient – no more! The reasoning is similar to why one would not want to over-torch their mesh; namely, over-exposure to heat causes the metal to become brittle. When it comes to a wick, pieces of it will flake off as you continue to expose it to high temperatures through use, and will most likely interact with the electrical current in the wire to create mini-shorts – a bad thing when you’re inhaling from the same chamber where this is occurring.
With wire, I’ve over-annealed it to the point where a single wrap around the wick causes the wire to snap in half! If you’re lucky enough to make it several times around the wick with your brittle wire, and furthermore lucky enough to be able to trap it at a severe angle without it breaking, my experience has shown me that it’s going to be a rather brief period of time before the wire simply breaks during use.
One of the chief reasons that there is such a severe learning curve to building Genesis style atomizers is that so many aspects of the process are about achieving balance – oxidizing enough, but not too much. Annealing to a certain extent, but not over-doing it. Wrapping the coil snuggly around your wick, but not too tight. Making your wick wide, but not TOO wide! The list goes on and on. It’s helpful for me to take pause and think about this, though, from time to time, and I imagine it would be of help to someone fresh to this process as well.