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16/01/09

I re-welded the cladding on and machined it again leaving at least 2mm of the stainless.  It was better, but I could still see a few patches of mild steel showing through the stainless so I’m going to do it a different way.  I think there could be several alternative methods for this.  I could get stainless rings made up and weld them both to the pipe and endcap.  Then machine as per the plans but directly onto stainless.  That might work. But, I think I’m going to just use a standard flange and O’ ring type pressure vessel seal and bolt it closed from the outside.  This will be not look as neat and won’t be as hydrodynamic, but easier to make and will also eliminate the need for the bolt on through endcap fitting.

 

So, the stainless ring has just become an expensive weld in backing ring.  This is a standard procedure on some types of pipe welds so it doesn't matter that it stays in.  I machined all the stainless off back to the ring and put on a 30 degree bevel for welding.  I will fit the alternative endcap removal system to the other end.

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