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Re: [PSUBS-MAILIST] Re: Welding machines for submersibles
Hi Welders,
The new computerized MIG machines eliminate the cold start problem by
running higher voltage at arc start for a programable number of miliseconds,
thus mitgating one of the previous significant negatives of this method.
They also can incorporate pulse tachnology which gives better transfer
efficiency as well as minimizes spatter.
Best egards,
Jim kocourek
----- Original Message -----
From: <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Saturday, March 17, 2007 5:32 AM
Subject: RE: [PSUBS-MAILIST] Re: Welding machines for submersibles
Tig = Tungstun inert gas ? Wire in the one hand and pistol in the other ?
We call it here WIG = Wolfram inert gas.
I use this for Troughhulls white/black also. The best fine welds.
MiG/or Mag is not very common for Troughhulls because of the cold start and
the difficultnest on some places to get it around.
Because of the big amount of troughhhulls we found this solution :
First layer to make an close basement and heat up the strong material
with Tig and all the following four-fife layers with MIG to safe time.
4-5 Fife layers of TIG takes to much time and maybe overheat the material.
In General TIG for fine things and MIG to make the rest.
High quality can also produce by stick weld - but stick welding is not so
easy for a person without much training.
Best regards Carsten
"Daniel Lance" <lanceind@earthlink.net> schrieb:
Brent,
The typical stainless steel penetrations on a K-250 or K-350 are of
relatively small diameter (1" to 2" ) . I believe the "average" welder in
a home shop not using a welding positioner would have a difficult time
twisting a mig gun around that small of a penetration and still produce a
quality weld. In my opinion tig welding in this situation is even more
efficient than stick welding. No cold starts , no splatter all museum
quality weld. Stick or Mig does have its place on the larger diameter
stuff like a hatch ring or group electrical penetrator ring.
DL
----- Original Message -----
From: Brent Hartwig
To: personal_submersibles@psubs.org
Sent: 3/16/2007 6:35:28 PM
Subject: RE: [PSUBS-MAILIST] Re: Welding machines for submersibles
Dan,
I've seen pretty good results with using MIG to weld the stainless steel
through hulls to carbon steel using stainless wire on a hyperbaric
chamber. What are the advantages of using a TIG machine for this? Is it
that TIG has less chances of inclusions and a smoother finish?
Regards,
Brent
From: "Daniel Lance" <lanceind@earthlink.net>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Re: Welding machines for submersiles
Date: Fri, 16 Mar 2007 06:26:01 -0400
Ray,
I would recommend the smaw welding process for all your pressure boundry
welds , tig for the stainless steel penetrations and the mig welding
process for everything else.
A good used stick welding (smaw) machine with an amperage rating of 250 to
300 amps will cost somewhere in the neighborhood of one to two thousand
dollars. It has to have a duty cycle of at least 60 percent. As a bonus
you can also do your tig welding with the same machine, utilizing a
scratch strart technique. To save money you can do without the mig machine
and do everything with stick . Stick welding (coated electrodes) is the
most versitile process for doing equipment repair too. Miller, Lincoln ,
Airco, Hobart and Esab are some of the more common brand names . Be sure
to get one with an infinate type amperage adjustment versus one that
only adjusts in 15 or 20amp "clicks" . I would not take a click type even
if someone wanted to give it to me. Is not enough fine adjustment for the
critical work that you will need to do.
Dan Lance
Daniel Lance
lanceind@earthlink.net
EarthLink Revolves Around You.
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603-529-1100
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