[PSUBS-MAILIST] welding

[Rick Patton via Personal_Submersibles]

I also tack weld U shaped pieces of plate (1/2" or 3/8") thick on the
inside, the number determined by the diameter of pipe to be welded, to keep
the root gap from closing from the heat as it is a pain having to use metal
wedges to do the same thing as they tend to get in the way of feeding your
filler rod. Once the root pass is completed you can knock the braces off,
clean up the tacks with a grinder and you are good to go.

Rick

On Sun, Nov 29, 2015 at 11:24 AM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank,   One thing I learned from my welder friend how to get things lined
> up good, he would weld a U shaped piece of steel to one hemisphere and then
> with a wedge pound the wedge with a sledge hammer, forcing the other hemi
> into place.  It's amazing how you can pooch out a big thick hemisphere like
> that !    That was with some points already welded on the other side. It's
> all about the set up.  Having the right gap is essential.
>
> Brian C
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] welding
> Date: Sun, 29 Nov 2015 16:14:44 +0000 (UTC)
>
> Brian,
> I agree, that was a bad idea, I think now I should weld it up first for
> the ports, the hatch opening should be fine.  They are two hemispheres, 1
> inch thick.   If these don't fit perfectly, I will just give a push with my
> porta power and brace.  I am planning substantial bracing before I weld
> anyways.
> Hank
>
>
>
>
> On Sunday, November 29, 2015 7:59 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank,    I would definitely have substantial weld on there before
> cutting the holes,  Are these two hemispheres?   What is thickness?   What
> will you do about the heads if they do not line up together exactly?
>
> Brian Cox
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] welding
> Date: Sun, 29 Nov 2015 13:46:15 +0000 (UTC)
>
> Hi all,
> My new sphere heads are done and on the way, they measured maximum 1\8 in
> out of round measured against a 120 degree template.   I am planning to
> tack the heads together  securely then cut the three port holes and hatch
> hole.  I want to cut out the port holes witch  have the circumference weld
> running through them before welding the heads together.  I want the pieces
> from the port holes for test material.  I want to weld them together to
> prove weld procedure and quality with coupon testing and I plan to stretch
> the coupons to breaking point also.   I am not sure if I should cut all
> these holes before the heads are welded, it may cause the heads to
> distort.  Maybe I should test with a 1 inch piece left over from the pod
> project.  Hmmm thoughts anyone?
> Hank
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