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Re: Galvanizing a Spar Hinge

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If the two ends of the pipe are sealed with the plates then you will definitely have a problem as the galvanizing pit is around 850 degree F and will likely explode or as a minimum pop the welds.  You will want to drill some air vent holes.

Thomas Hunt, S.E.

"bill(--nospam--at)" <bill
02/12/2010 01:10 PM
Please respond to seaint
"<seaint(--nospam--at)>" <seaint(--nospam--at)>
Galvanizing a Spar Hinge

Let me describe this mechanism.
Imagine a spar made of a length of pipe, with round plates welded on each end to close the pipe - now it looks like a spool. Now, weld a gusset or ear on each end of this assembly, so that they project along the long axis. Put a 1.5 inch hole through each of these gussets.
Now imagine you have embed plates or padeyes anchored into a concrete block, which have TWO parallel gussets welded to the embed, with a gap between the two pltes just a smidge wider than the thickness of the gusset plate on the spar. These plates also have 1.5" holes, so that you can fit the spar gusset between the padeye double-gussets, align the holes, and slip a pin+cotter through the holes.
Voila, you have a hinge.
Now, is it okay if everything is galvanized? Or must you prevent galvanizing deposits on the "faying surfaces" of these plates (both sides of the spar gusset, and the inside of each padeye gussets)?
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