Nichrome melting in triple series use

[Foggyroomz]

So I built a twisted build out of nichrome 60 wire and tried it on a triple series 18650 mechanical box and it melted the coils why won't nichrome work with any series boxes 8.4 volt melted 12.6 volt melted but I can build a .06 nichrome build and run it on my mech tube mod and it handles it I can build .15 and run it at 150 watts on my sigelei and it handles it but bump up the voltage and it melts don't get it. I ran a .30 nichrome build at 260 watts on a SMY 260 and had no failure of the coil so I'm puzzled why a series mech box desemates the coils?

 

[alicewonderland]

8.4v and 12.6v is pretty high lol

 

[Wraith504]

.3 at 260w is 8.8 volts so you would think 8.4 it would be ok...?

 

[alicewonderland]

were you firing it without vaping it? or airflow coming into the RDA to cooldown the coils efficiently? I find my nichrome 80 wire starts to melt and give up if there isnt efficient airflow to cooldown the coils, even at only 0.2ohm 4.2 volts sometimes the coils just give and taste disgusting if i chainvape it too much.

 

[Wraith504]

not sure I have never really used nichrome. I always use kanthal, stainless steel, or nickel.

 

[rhelton]

When your in wattage mode and running that low your not getting anywhere near that high voltage. High voltage vaping is fun and enjoyable but you gotta get the ohm load higher too do it.

150 watts @ .15 needs 4.74 volts and 31.62 amps
250 watts @ .15 needs 6.12 volts and 40.82 amps

Your trying to vape at over 470 watts. Slow your roll cowboy your pushing the limits too far thats crazy high lol.

.30 @ 8.4 is 235w your gonna have a hard time keeping that under control. Your VW mods are not giving you the correct voltage trying to vape that low. They have amp limits and voltage caps. I hope that makes sense.

 

[edyle]

So I built a twisted build out of nichrome 60 wire and tried it on a triple series 18650 mechanical box and it melted the coils why won't nichrome work with any series boxes 8.4 volt melted 12.6 volt melted but I can build a .06 nichrome build and run it on my mech tube mod and it handles it I can build .15 and run it at 150 watts on my Sigelei and it handles it but bump up the voltage and it melts don't get it. I ran a .30 nichrome build at 260 watts on a SMY 260 and had no failure of the coil so I'm puzzled why a series mech box desemates the coils?

If you could ............ no offence intended............... if you could put a sentence together you might get an answer.

 

[LilWhiteClouder]

I feel like I'm tootle puffin here with my Nichrome 80 coils I built to .3 with 8 wraps (9/8) of 26 & 28 g twisted paralleled wrapped with 28 g on each side. I want to raise my watts higher than the mech can produce on a full batt, around 57. But I'm not sure I can handle the wattage that OP has been mentioning.
Curious if this happened while vaping, as Alice questioned. Nichrome melts at 2550.2 F (1399 C). That's a hot hit!!!

 

[Sgt.Rock]

.06 at 12 volts?

Hell man...check the math?

12X12=144
144/.03= 2400 watts

144/.15=960 watts

Problem?

 

[Foggyroomz]

The coils I built were at .95 ohms I didn't want to vape the sun. I understand that 12.6 volts is a lot but I vaped the same ohm build of Kanthal with no issues.
My question is why does the nichrome fail under higher input voltages?

 

[Foggyroomz]

12.6 volts @ 0.95 ohms is 13.2 amps and 167.2 watts so why did nichrome melt I've built .15 and run at 150 watts on sigelei with no issues? Is there something to do with higher voltage that makes nichrome melt?

 

[Cullin Kin]

Sorry dude but your initial post says nothing about 0.95 Ohms. It says 0.06, 0.15, and 0.30.

 

[Sgt.Rock]

Nichrome will heat up faster than Kanthal--so if you're seeing this happen when dry burning then what's happened is that you overheated the metal...to have the same effect on Kanthal I bet you could recreate it by heating it longer...

Just pulse burn/heat the Nichrome coil until it starts to glow unless it's wicked and saturated and I'd bet it will do the job properly. Abusing a thin piece of wire with high current flow resulting in high heat will always result in failure--some just heat and fail sooner than others.

 

[Foggyroomz]

Hey Sarge it did this while juiced and wicked that's why it's puzzling me that 12.6 volts of direct current just destroys the coil.
The kanthal coils built to same ohm was barely a 1 second hit but didn't go into meltdown status it just produced an enormous amount of vapor in very short order dang near instantaneously to be honest.
I did run lower ohm builds of the same wire on a 4.2 volt mech and a .15 ohm of same material at 150 watts on my Sigelei 150 with no issue.
I even ran the same twisted wire at a .30 on my friends SMY 260 triple 18650 box at 260 watts which is 90 some odd watts higher than the build I was trying to run on the triple series mech box and it ran with no faults. I guess triple mech series boxes are just kanthal creatures and aren't nichrome friendly.

 

[Bunnykiller]

VV/VW units self regulate to a certian amperage limit... a set of 3 seriesed 18650 have no regulation and will deliver full amps available considering the resistance..... VV/VW are prone to voltage drops at the ohms/watts you are trying to push... kinda like driving the car up a hill... you have the pedal to the floor but the car isnt doing the 120mph as it would on a flat road...

 

[Bunnykiller]

btw what gauge are you doing this with??

 

[Ohm Gnome]

 

[Dzaw]

I am betting the coil shorted to itself. This would drastically cut resistance, even if only momentarily. thus, rapid runaway temperature climb. If a tiny short caused a gall or spot weld, even a miniscule one, you could have a short that won't let go, and meltdown soon to follow.

 

[Foggyroomz]

It was 26 gauge 3mm ID 15 wraps each side but it was a compressed coil so I'm thinking on trying to do a twisted coil that is spaced that would look like my Mutation build