TCR is a factor much less important than the resistance that a wire has Grize. I have explained before the issue with nickel or any other wire that doesnt have resistance but the more times I say it, the better, so I am glad you asked
I will tell you an example, so we can all understand better the issue. Imagine a setup at 0,05 ohms. If we screw-unscrew atomizer on mod, if we screw unscrew the cap to reload battery, if we unscrew2 any part of the mod at any time, the resistyance changes. The changes are small but they are big if you vape on a 0,05 wire. The whole resistance can be doubled very easy. Now, imagine what will happen if you touch any thread with your oily fingers and then screw again this part on the mod.
So, if resistance doubled or even if raised by 20-30-40 %, the result is very poor vapor.
Better dont vape any wire out there. Metals need a lot of years to be tested, so stay on the safe side and vape Ti or SS. You dont want to hear any bad news after 5 years for the wire you use. And there is absolutely no reason to vape any any wire out there. The solutions are already here. Ti and SS are biocompatible materials and they are the only ones that can be used on e-cigs. The rest of metals are NOT safe
I will tell you an example, so we can all understand better the issue. Imagine a setup at 0,05 ohms. If we screw-unscrew atomizer on mod, if we screw unscrew the cap to reload battery, if we unscrew2 any part of the mod at any time, the resistyance changes. The changes are small but they are big if you vape on a 0,05 wire. The whole resistance can be doubled very easy. Now, imagine what will happen if you touch any thread with your oily fingers and then screw again this part on the mod.
So, if resistance doubled or even if raised by 20-30-40 %, the result is very poor vapor.
Better dont vape any wire out there. Metals need a lot of years to be tested, so stay on the safe side and vape Ti or SS. You dont want to hear any bad news after 5 years for the wire you use. And there is absolutely no reason to vape any any wire out there. The solutions are already here. Ti and SS are biocompatible materials and they are the only ones that can be used on e-cigs. The rest of metals are NOT safe