Wire question

[Newtothevapelyf3]

I was told not to use a nickel coil in nothing but temp control, but how come you can use nicrome wire and it doesn't have to be in tc? Dumb question but just curious

 

[bwh79]

Because the nickel's physical and chemical properties are changed when it is alloyed with other metals to form nichrome.

 

[Two_Bears]

I was told not to use a nickel coil in nothing but temp control, but how come you can use nicrome wire and it doesn't have to be in tc? Dumb question but just curious

Nichrome is not 100% Nickel.

Nichrome is a blending of Nickel and Chromium.

 

[Alien Traveler]

Ni has too low resistance to be used in wattage mode without possible problems, especially if it is put in a mech mod. Also, this low resistance wire is easy to overheat, and it can be not healthy.

 

[bwh79]

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Ni has too low resistance to be used in wattage mode

If this was all it was, you could just build a bigger coil to get the resistance up to an acceptable level. Still, nobody does this. The problem is actually the second thing you said, about nickel being unhealthy at higher temperatures. Without the temperature limiting, the wire can easily become hot enough to form nickel oxide, which can spell bad news if it gets inside your body. Nichrome, being an alloy of nickel and chromium, has different chemical properties than pure nickel and does not form nickel oxide, at least not at vaping temperatures. That's how I understand it, anyway.

 

[Alien Traveler]

If this was all it was, you could just build a bigger coil to get the resistance up to an acceptable level. Still, nobody does this. The problem is actually the second thing you said, about nickel being unhealthy at higher temperatures. Without the temperature limiting, the wire can easily become hot enough to form nickel oxide, which can spell bad news if it gets inside your body. Nichrome, being an alloy of nickel and chromium, has different chemical properties than pure nickel and does not form nickel oxide, at least not at vaping temperatures. That's how I understand it, anyway.

I mostly agree.
But low resistance can be dangerous for both seller and buyer. Suppose someone try to use tank with premade Ni coil on a mech mod...

 

[bwh79]

Suppose someone try to use tank with premade Ni coil on a mech mod...

I think you're getting your signals crossed, there are a couple of different issues at work here:
Using Nickel wire outside of temperature mode is bad news no matter what the resistance.
Using too-low a resistance on a mech mod is bad news no matter what the coil material.

I'm not saying that too-low a resistance is not an issue, I'm just saying it's not the issue this time.

Too-low a resistance on a mech mod is bad news, no matter what material the wire is made of. It's not about nickel vs. other types of metal. I'm gonna play the Devil's Advocate here, and say that .15 on a mech mod (a pretty standard prebuilt Ni200 coil resistance if I'm not mistaken) is probably not even all that dangerous. At full charge of 4.2v with zero voltage sag (an unlikely story, especially at such a low resistance) that's 28 amps. That may be pushing your luck a little bit, but pulsing 28 amps is not likely going to cause a catastrophic failure in the types of batteries we use today. But you still don't want to do this with a nickel coil, because of the health issues. It has nothing to do with resistance, or battery safety.

On a wattage-regulated device, resistance doesn't even matter. It will either fire the coil, or it won't. Amp drain on the battery is solely dependent on its charge state and the wattage setting selected by the user. Sixty watts is sixty watts, as far as the battery is concerned, and it doesn't really know or care whether you're pushing them through two ohms or two-tenths of an ohm. But you still don't want to do this with a nickel coil, because of the health issues. It has nothing to do with resistance, or battery safety.