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Welds in Vacuum systems, and their problems

Welds in Vacuum systems, and their problems

Welds in Vacuum systems, and their problems

(OP)

In mass spectrometers under Vacuum you try to build in the minimum amount of welds, you try and make parts (from solid Stainless that is )  

One prob is you may have a tiny leak thru a weld, another is you may have welding gas, from the weld, escaping into the vacuum

My question

Can you solution treat SS and cure maybe the escaping gas, problem  
I doubt whether solution heattreat would also cure tiny holes or porosity in the weld , on the microscopic level that is

Thanks for any input  

RE: Welds in Vacuum systems, and their problems

You are correct in that heat treating the stainless steel would not fix the porosity or pinholes in the weld.

I don't think you need to heat it up to solution heat treatment temperatures - typically, you can drive off the smaller gas elements with a lower temperature like 300-400°F.  I would think a similar bake would work on Argon shielding gas.

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