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Re: [PSUBS-MAILIST] Thanks to all and another question
Hi Paul,
I think your wise to let a good pipe welder do the critical welds if you are
not a competent welder. Also do your homework on who you use. Ask to see
some work he/she has done if that is possible or better yet, tack a couple
of coupons together with the proper bevel and root gap and have him/her weld
them out. Usually but not always, if it looks good, it is probably clean on
the inside but you can still have mechanicals done on there weld for more
piece of mind.
I know this is a hassle and can be a bit expensive but I own a welding
company and I can't tell you how many people have come threw my doors saying
they are god's gift to welding only to find out later that they were so so.
Certs also can be faked so call the company that did it to be sure. I know I
may sound paranoid but it's your fanny that will be inside, not the guy who
welded it. As for non essential welding on the boat, clips ect. you would
probably be fine though I've seen mig welds that looked beautiful to the eye
but had a lack of adhesion on one or both sides of what they were welding
due to improper heat or surface contamination. I am old school and use stick
or tig whenever I can.
I used to weld pipe for the oil companies on the bottom of the ocean in a
little dry room and the procedure we used was, Set root gap at 3/16" with
proper sized lands using an 1/8" tig rod with a 22.5 bevel on each side.The
root pass (1st one) was tig, the hot pass (second one) was tig, next pass
was 3/32" stick lo hi, and the fill and cap were 1/8" stick lo hi. all rods
were kept in a heated rod box due to the helium and moisture environment but
it's still good to use a heated rod box when using lo hi which merely means
low moister content and keeping them warm will do that for you.
Good luck
Rick P.
----- Original Message -----
From: "Paul Lassen" <lassen@rosebud.ca>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, January 05, 2010 6:08 PM
Subject: [PSUBS-MAILIST] Thanks to all and another question
Thanks to all who responded to my concerns about quality welds, visibility
and design choice. Looks like its best to let a pressure welder do the
pressure welds, (go figure). Now it looks like the Eurosub might also be a
possible candidate.
So my question now is, if a guy needed to take a welding course for all the
remaining welding work on a PSUB, which would be of more benefit, stick or
MIG?
Paul Lassen
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