Reusability of Swagelok

For posts specifically relating to fusor design, construction, and operation.
ian_krase
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Real name: Ian Krase

Re: Reusability of Swagelok

Post by ian_krase » Sat Mar 17, 2018 6:46 pm

Yeah, brand new brass swagelock works fine and fairly new brass swagelock is OK. I wouldn't subject it to vibration or too much thermal cycling though.

Plus there are fully compatible and just as good swagelock imitations commonly available from McMaster or even Amazon at much lower prices. Especially when made of brass, for combination with 50 cents a foot hand bendable copper tubing from local hardware store.

You can also use o-rings and backwards ferrules to turn swagelock into poor man's ultratorr fittings. This would function as the dismountable tube fitting we need. This or VCO fittings are preferable if high temperature or UHV is not needed.

It may be possible to pick up large "garbage" assemblies of VCR from semiconductor business surplus and cut them up.

Jerry Biehler
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Re: Reusability of Swagelok

Post by Jerry Biehler » Sun Mar 18, 2018 2:57 am

VCO fittings are not used for high temp or high vacuum.

Swagelok new or old is fine for high vibration no matter what material you use. Brass is cheap and stainless is corrosion resistant. There are also steel and aluminum versions out there plus a couple exotic metals.

I have reused a lot of VCR stuff, just did on the gas manifold on my big system. The big thing about VCR is you are going to need a orbital welder ideally or at least a tig machine to weld the fittings on, there is no simple way to make new assemblies with VCR.

ian_krase
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Real name: Ian Krase

Re: Reusability of Swagelok

Post by ian_krase » Mon Mar 19, 2018 5:01 am

Why not silver brazing?

Jerry Biehler
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Re: Reusability of Swagelok

Post by Jerry Biehler » Tue Mar 20, 2018 12:51 am

Silver brazing is fine as long as you are sure you have cadmium free rod. The problem is the internals can be very dirty and oxidized and it is going to be a real pain to clean it up. So for larger stuff it is fine or for stuff like water cooling lines inside the chamber. It is also used for connecting chunks of copper together since it takes a heck of a lot to tig weld copper, especially big chunks.

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