Re: [PSUBS-MAILIST] Stainless Welding.

[" Dan. H." <jumachine@comcast.net>]

James,

No problems with the two different metals but you should use a welding rod 
that is designed for this application.  I have some at my shop but forget 
the designation.  If you contact a welding supplier the will advise you of 
what they have.  Use stainless rod for the stainless, steel rod for the 
steel ,but this particular rod is for joining the two different metals.

Use as much stainless as you can afford on your sub.  For things that rub, 
like hinge points, it will save you major corrosion and rust streaks in your 
paint.  But, for something like a VBT, don't spend the money.  The tank just 
sits there.  All the corrosion is on the inside.  Sure you can't see it to 
inspect it, but if it's thick enough, it's not a big problem.  If it leaks 
it will start with pinholes anyway.   If you make it with heavy wall 
material it will last a long time.  You can cut it off and replace it with a 
new one in ten years if you feel it needs changing.  Put the stainless in 
places where you get the most for your money.

There's a reason the worlds navies don't build stainless steel ships.  The 
price!  Maintenance and replacement part are sometimes cheaper.

Dan H.


----- Original Message ----- 
From: <james@guernseysubmarine.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, June 17, 2008 4:03 AM
Subject: [PSUBS-MAILIST] Stainless Welding.


Hi All.

As my sub will be used in the sea, ive decided to make some parts out of 
stainless rather than mild steel.  In particular, i have made the hatch 
hinge arrangement all again.  (I made it from mild steel to start with). 
Here is a picture of the original brackets i made. 
http://www.guernseysubmarine.com/index_files/Page10471.htm

Ive made the whole thing now again from 316L (no picture yet) and its all 
assembled ready to weld to the conning tower.  Then i just thought of one 
thing...

I will be welding 316L on the brackets straight onto A516 on the tower.  Can 
anyone see any problems with that?  The welding of dissimilar metals 
straight onto the hull?

I think it should be no problems as the throughhulls are the same principle, 
but what do you all think?  Any problems that i havent thought about?

Thanks
James






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