-----
Original Message -----
Sent: Wednesday, July 25,
2007 9:30 PM
Subject: RE: [PSUBS-MAILIST]
Welding Revisited
You would be amazed at how many welding rods use to be
found in the hull welds of the Navy’s HY-80 sub hulls. Lazy yard
welders would use rods as fill to get more welding done. Of course these
were found by X-ray and had to be removed with a grinder and re-welded.
For some time now they have been using robotic welders that lay a fast,
consistent bead with no worries of bad filler.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
A skimmer afloat is but
a submarine, so poorly built it will not plunge.
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Lil Brother LLC
Sent: Wednesday, July 25, 2007 10:03 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Welding Revisited
Dan,
You said the magic words:
"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 ?"
I don't care who the person is, how good they are, there
is a possibility of
the weld failing x-ray inspection. If that were not the
case, the U. S. Navy
wouldn't x-ray every weld on a sub.
Just because a highly qualified welder is diligent and
does his best, does
not mean he will not make a mistake. He is human after
all.
You couldn't actually tell if the weld would pass an
x-ray unless it is
actually performed. Granted the welder will be very
careful about his work,
a third person is always less concerned with your safety
than you are. This
is just a fact of human nature.
"If your hull fails at 200 hundred feet you will be
just as dead
as if it failed at 900 feet."
The statistics would say that you are mistaken. The human
body (if not
crushed) would be far more likely to survive the
pressurization(even
rapidly) at 200 feet, but is extremely unlikely to
survive at 900.
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)
>
>
>
>
>
>
************************************************************************
>
************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with
the US Federal
> CAN-SPAM Act of 2003. Your email address
appears in our database
> because either you, or someone you know, requested
you receive messages
> from our organization.
>
> If you want to be removed from this mailing list
simply click on the
> link below or send a blank email message to:
> removeme-personal_submersibles@psubs.org
>
> Removal of your email address from this mailing list
occurs by an
> automated process and should be complete within five
minutes of
> our server receiving your request.
>
> PSUBS.ORG
> PO Box 53
> Weare, NH 03281
> 603-529-1100
>
************************************************************************
>
************************************************************************
>
************************************************************************
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the
US Federal
CAN-SPAM Act of 2003. Your email address appears in
our database
because either you, or someone you know, requested you
receive messages
from our organization.
If you want to be removed from this mailing list simply
click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list
occurs by an
automated process and should be complete within five
minutes of
our server receiving your request.
PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the
US Federal
CAN-SPAM Act of 2003. Your email address appears in
our database
because either you, or someone you know, requested you
receive messages
from our organization.
If you want to be removed from this mailing list simply
click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list
occurs by an
automated process and should be complete within five
minutes of
our server receiving your request.
PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************