RE: [PSUBS-MAILIST] Another stupid question.

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

Hi James,
If you are " Mig" welding you must use Flux core wire with a cover gas ( "
Dual Shield" ) tensile strength of the wire must be 70,000 psi. Regular
hard wire mig is not appropriate for pressure vessel work.
If you want to "Stick" weld then you must also use a 70,000 tensile
strength rod , like E7018, or E7010( These two are the easiest to use to
make out of position welds). Never use an E60 rod on 516gr70 steel meant
for low temperature pressure vessel service( actually never on 516gr70
steel) , All welds should be full penetration with back gouging of the root
and then back welded.
Dan Lance


> [Original Message]
> From: <james@guernseysubmarine.com>
> To: <personal_submersibles@psubs.org>
> Date: 4/28/2008 9:03:21 AM
> Subject: [PSUBS-MAILIST] Another stupid question.
>
> Hi All.
>
> I know this question will have come up before but im going to ask anyway.
>
> I've been busy this weekend cutting and fitting hull viewports.  You can
look here.
>
> http://www.guernseysubmarine.com/index_files/Page10371.htm
>
> I am mig welding most things on my project but, with the hull viewports,
i have now found that i cannot get the mig gun in at the correct angle
between the port and the reinforcing rings on the inside.  Its still
awkward, but i think i can get it with a stick.
>
> I will have to borrow an inverter set so im waiting until ive done all 4
and then i'll borrow the set and do them all in one go.
>
> The question is.........What electrodes do you guys suggest?  I was
thinking of E6012.  2.5mm
>
> What do you think?
> Thanks
> James
>
> http://www.mylincolnelectric.com/Catalog/consumabledatasheet.aspx?p=8333
>
>





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