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Subject: Re: [worldcruising] Adding Lead To A Keel
From: Lew Hodgett (lewhodgett@XXX.XXX)
Date: Mon Aug 12 2002 - 11:51:53 EDT
"Russ Swan" writes:
>Question: What's the best way to add lead to steel keels?
Very carefully<G>.
>Should I paint the surface of the steel before adding hot lead?
I wouldn't.
>If not, how should I prepare the surface of the steel?
Make sure the keel cavity is totally DRY. If hot lead comes in contact
with any water, you have a problem.
>What about galvanic corrosion i.e. interaction between the two
>different
>metals i.e. between the lead and mild steel?
I wouldn't worry about it.
>Has anyone some advice about a good (simple) way to go about melting
>and
>adding the lead?
Having collected over 20,000 lbs of lead scrap, reducing it to clean lead
and then pouring a keel, will offer the following:
The secret to working with molten lead is heat, lots of it.
You want at least a 500,000 BTU burner. The lowest cost burner that size
is a hand held propane unit that is used by asphalt contractors to seal
the seams of the asphalt when the pave a parking lot.
Do not expect to be able to hand hold a torch and deliver enough heat to
get the job done.
You will fall asleep standing there and the lead still won't be molten.
You only need a small amount of lead for the total job (200 Kg) so you
can do the whole job in one pour.
You will be adding the lead by pouring into a narrow opening (50 mm) so
probably the easiest way is to use a ladle and pour the lead into the
cavity, one ladle at a time.
Get a plumber's ladle which was used in the old days to pour molten lead
into pipe seals. It will hold about 2 Kg.
I used an old painter's pot as a heating vessel which would hold about
900 lbs of molten lead. It was about 15"-18" dia and about 20"-24" high.
Built a U-Shaped structure from some common brick, placed the burner
inside and set the pot on top.
After the pour is complete, come back a couple of days later and pour
some epoxy on top of the lead and allow it to seal the top surface.
HTH
Good Luck.
Lew
S/A: Challenge (Under Construction in the Southland)
There are no problems, only varying degrees of Challenging opportunity
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