[PSUBS-MAILIST] Drawing

[Rick Patton via Personal_Submersibles]

Thanks Sean, I have never been taught how stress works in steel. We just
had a metallurgist that would tell us what they wanted and we did it.  I
always bevel the edges and then leave a 3/16" gap for the root so that I
don't have to back gouge.
Rick

On Fri, Apr 22, 2022 at 8:02 AM Sean T. Stevenson via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> 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 <
> personal_submersibles at psubs.org> 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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