Very interesting Roger what you bring. As you said, i've searched also in
internet but there is not much reference. I will talk with a local
machinist also and keep you posted.

There is this company though: www.spurind.com but it might turn out very
costly since it seems to be a specialty.

André

"Roger Long" wrote in message
...
Sorry, but the following is completely wrong. The explosively jointed
bimetallic strips have a long and successful history. The aluminum is
welded to the aluminum side and the steel to the steel side. The strips
simply seem to have become hard to locate, at least via the web.

Regular steel and stainless steel are often joined. Problems can occur,
especially if submerged in salt water but you'll see mild steel /
stainless joints on fishing vessels that have been going for years and
years.

True, you can't weld aluminum directly to either.

How do I know about aluminum superstructure on a steel hull?

I did it on this boat:

http://www.bbsr.edu/About_BBSR/Facil...herbird_ii.htm

--

Roger Long



wrote in message
...
I have just double check with my friend who worked as a welder for 35
years in a shipyard that build commercial, coast guard vessels,
battleships and drilling platforms.
If you have an aluminums structure welding steel plates on or doing the
reverse was not in practice. Aluminums and mild steel or cold rolled
steel are not compatible. The same thing applies to welding stainless
steel. What takes place is a white inter granular corrosion that is
hardly visible to the naked eyes. Given time the white corrosion will
cause a structural failure. Not to mention the saline atmosphere at sea
that will accelerate the process.

"André Langevin" wrote in message
...
Hi to all,

I am a newcomer on this newsgroup and you'll see me around as i'm
starting the construction of a new boat. I currently have a 34 feet
powerboat in aluminum and my nest boat will be a 44 or 45 steel
sailboat. I'm looking at building a Bruce Roberts design and i would
like the deck superstructure to be in aluminum. I've seen many
commercial boat done this way and even old Coast Guard patrol boat of
30+ years old without any corrosion problem so it is something i'd like
to do. But i can't find any industry that carries the special strip
that isolate both metals but still permit to weld them both.

Does someone ever see this ?

André