Re: [neonixie-l] Re: Why tungsten wire and why weld copper to tungsten? Also book recommendation?

[loknar28]

I think it probably has to do with the melting point being higher that what is required to work the glass into a sealed tube and it is then spot welded to the more cost effective copper. The same reason for old school lightbulbs using tungsten filaments I would imagine. I found this which spells it out pretty well.  “ It has the highest melting point of all the elements at approximately 3370 degrees Celsius, and the lowest vapor pressure of any commonly used metal. Tungsten's extremely high melting point makes it an ideal metal for structural applications exposed to very high temperatures.” Rhenium Alloys: Pure Tungsten wire and rod rhenium.com Sent from my iPhone On Dec 26, 2022, at 18:17, Miles Thatch <milesandytha...@gmail.com> wrote: For question 3), seems like I have not skimmed far enough. The Weston book goes into the detail of the physical build of a cold cathode discharge tube. On Monday, December 26, 2022 at 3:26:36 PM UTC-5 Miles Thatch wrote: 1) I was watching some nixie production videos and a question came up. Is tungsten wire used because this metal offers the most appropriate seal with glass? One of the videos where a nixie was made in a garage showed that tungstan turns a coppery color when, as commented, properly seals with the glass. 2) Another question came up when watching this video:  https://www.youtube.com/watch?v=q7I61d27R3E&ab_channel=jdflyback Here I've seen copper wires be spot welded to tungsten wires. Why isn't tungsten used all throughout? Does solder not adhere to tungsten when soldering the tube onto a pcb? Or is it because tungsten is too expensive to be used in such abundance? 3) I've seen a google drive link floating around here somewhere with some books on the subject of cold cathode discharge lamps. Does that book roster have anything that focuses on manufacturing process rather than the physics and math behind the discharge? Appreciate the guidance. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/29af9ae8-0674-4bce-88ed-cc92eb3abe30n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/9DC14181-343F-419C-9EEC-352BBFAD179E%40gmail.com.