RE: [PSUBS-MAILIST] Welding Revisited

["Daniel Lance" <lanceind@earthlink.net>]

 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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