metal to metal joint seal
metal to metal joint seal
(OP)
hey, i was wondering if anyone could help with a project i have been working on for a couple of weeks. here it is. i need a aluminum metal to metal zero or no leak joint. that will with stand a small molecule like r-134a. i would like to wring those two connections together without a gasket or o-ring. Would i looking at a situation like a gauge block surface, or would i have to go less rough.
if you could point me in the right direction i would greatly appreciate it
if you could point me in the right direction i would greatly appreciate it





RE: metal to metal joint seal
Regards
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RE: metal to metal joint seal
RE: metal to metal joint seal
RE: metal to metal joint seal
It also works well as a thread seal for oil, water and fuel.
I expect they will have compatibility charts for refrigerant gasses.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: metal to metal joint seal
There is no such thing as a zero leakage joint, there will always be some finite leak rate, especially with small molecule gasses.
I actually work for a metal seal company that makes seals with a leak rate down to 1E-10 cc per min He, which is pretty darn tight. (1E-5 is bubble tight) Typically are parts have a surface finsh of 16 microinches rms or better. Naturally the smoother the surface finish, the less leakage you will experience.
You also need to take load into account to form a metal to metal seal. The more resiliant the interface the less load you will need. A typical sealing load for metal to metal seals is 250lbs per linear inch of sealing interface.
RE: metal to metal joint seal
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