RE: [PSUBS-MAILIST] Re: Welding machines for submersibles

[Jonathan Grant <scuba4fun97321@yahoo.com>]

As a welder I would recommend a tig unit that has Hi
Frequency. There is a lot less chance of inclusions in
the weld starts and stops.

Jonathan

--- Daniel Lance <lanceind@earthlink.net> wrote:

> 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
> 
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> Daniel Lance
> lanceind@earthlink.net
> EarthLink Revolves Around You.
> 
> 
> 
>
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