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  1. BigBunny

    Symbol for fillet weld with no filler?

    Thanks to all for the help on this! I think this will let us call this out clearly going forward. I makes sense to leave the fillet symbol alone w/o a size control, and add the "autogenous" text to the tail along with the GTAW text (is that correct to include both?). I will also update the...
  2. BigBunny

    Symbol for fillet weld with no filler?

    I have a question on how to properly call out a weld that our manufacturing team has been doing for decades. The symbol does not seem to be correct to me, so I am looking to update the drawings if it makes sense. This is a flange welded to the end of a tube using TIG with no filler - a fusion...
  3. BigBunny

    HF resistant material for vacuum chamber

    Thanks for the suggestions. HF is used to etch amorphouse SiO2 (quartz/glass), so we had written that one off a long time ago. We are actually using sapphire for chamber view ports, since the crystalline Al2O3 is very good vs. HF. However, our part is a bit too large for sapphire to be...
  4. BigBunny

    HF resistant material for vacuum chamber

    Hello Engineers, I have a difficult application where I am struggling with materials. I have designed a gas diffuser that will be used in a vacuum chamber. It has lots of small holes to choke & spread the gas flow out as it enters the process chamber. I have made one from PTFE, but we are...

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