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Re: [PSUBS-MAILIST] Welding Revisited
Dan,
I will apologize and say that I read your post wrong.
I thought you implied that the welds on the subs should be x-ray tested.
Which is not what you implied at all.
You stated the welds should be x-ray quality. I went back and reread the
post.
I understand you are relaying your expertise, and I appreciate that.
I also understand that you have to make the assumption that every person is
the average "Joe." (Joe don't take offense)
I, on the other hand, do a vast amount of research and learning to complete
whatever is necessary to complete the task at hand.
I'm not a certified welder, but will probably become one for the task, if I
do decide to more forward with the building of a sub.
This is a case of, the other guys behind will not be in it, mine will. It's
not that I don't trust another person, but I could be having a really bad
experience, and the welder could be at home pitching the baseball around
with his kid. I believe in "rowing my own canoe."
James Long
Owner/Designer
Lil Brother LLC (Instrument Division)
----- Original Message -----
From: "Daniel Lance" <lanceind@earthlink.net>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, July 25, 2007 8:04 PM
Subject: RE: [PSUBS-MAILIST] Welding Revisited
James,
If you tell a welder his welds are going to be x-rayed when the job is
completed there is a tendency for that person to be more diligent in his
work.
X-ray "quality"welding as it applies to Pressure Vessel Quality work means
a bare minimum of porosity, slag inclusions, undercut etc. and no tolerance
for lack of complete penetration and/ or non fusion in the root pass. A
submarine pressure hull must be built to PVQ standards to acheive 100% of
the hull integrity needed for its intended purpose.Setting the "bar" high
for selecting a weld process, procedure or weldor is whats necessary for
such a demanding application. Most psubers won't spend the money to x-ray
their welds , but would'nt you like to know they would pass a test if you
did one ? If your hull fails at 200 hundred feet you will be just as dead
as if it failed at 900 feet.
Dan Lance
> [Original Message]
> From: Lil Brother LLC <lil_brother_llc@bellsouth.net>
> To: <personal_submersibles@psubs.org>
> Date: 7/25/2007 12:45:47 AM
> Subject: [PSUBS-MAILIST] Welding Revisited
>
> Ok,
>
> We have discussed welding and the methods involved.
>
> Shouldn't we also discuss the situations that pertain to each type and
the
> critical requirement for each?
>
> I know that a professional welder knows what he is talking about, but I
> think x-ray on welds that will never pass regular scuba diving depths is
a
> little extreme on the side of safety.
>
> I'm not knocking safety at all, I tend to lean to the safe side of
> everything. But there is a point to overkill when it comes to safety
> measures.
>
> I agree, if you are going to depths of 600 -1000 feet, I would definitely
> have the most certified welder available, and have the welds tested by
> x-ray.
>
> But I don't see the need to go to that measure if the sub is only going
to a
> max depth of 200 ft. I do see the need of the welds being proper,
airtight
> and strong.
>
> But I'm a realist, so I can handle the opinions from whoever disagrees
with
> me.
>
> James Long
> Owner/Designer
> Lil Brother LLC (Instrument Division)
>
>
>
>
>
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603-529-1100
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CAN-SPAM Act of 2003. Your email address appears in our database
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Removal of your email address from this mailing list occurs by an
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PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
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