[PSUBS-MAILIST] Drawing

[Sean T. Stevenson via Personal_Submersibles]

Rick - Should be fine. A full penetration weld, done properly, is actually stronger than the base metal. Your only concern would be reinforcement, but that through-hull fitting looks beefy enough to more than meet the requirements for hull material replacement. You will want to bevel the edges around your hole to ensure that the new weld is full penetration all around, and once you start welding one side, will need to grind or backgouge into the root / clean metal from the opposite side before laying passes on that side.

I presume from your sketch that the fitting will be radially oriented through the cylindrical hull exclusively (i.e. fitting axis passes through hull axis), and does not land on the head curvature where it would be tangential or offset?

Sean

-------- Original Message --------
On Apr. 22, 2022, 11:43, Rick Patton via Personal_Submersibles wrote:

> I am not knowledgeable in metallurgy or structural stress as applied to metal so was wondering if what I wanted to do was acceptable.
> The best place to mount my arm to the sub would make the thorough hull release fitting go through the full penn weld that attaches the front dished dome to the hull.
> Is that acceptable?
> Rick
>
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