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I'm studying the design and construction of viewports for vacuum systems. Usually, the window is bonded to a welding ring, which is then welded to a stainless flange. (See the cross section below for an example.) I have encountered several synonyms that seem to be used interchangeably: adapter, sleeve, and stub. I'm looking for the proper name for this component so that I know what to ask for when contacting potential vendors, because I'm having a hard time finding these items in catalogs.

viewport-with-weld-stub

The red boxes indicate the welding ring; (source)

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  • $\begingroup$ It was a struggle, but you appear to want a zero length weld spinning. I have no idea if this is just one manufacturer's term for it, or if it is a standard term. $\endgroup$ – Phil Sweet Aug 21 at 3:39

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