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Re: aluminum welding

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Contractor likes the idea of jacketing the corroded aluminum pole with
stainless steel pipe and bolting them with stainless steel bolts.

Thanks for the timely advice.

Brad Smith, SE

----- Original Message -----
From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, March 05, 2002 8:46 AM
Subject: RE: aluminum welding


>
> You can not weld stainless to aluminum, but you can weld stainless to the
> carbon steel pan.  Welding stainless to carbon steel is not commonly done,
> but it is possible.
>
> Weld a piece of stainless pipe to the fins.  Put holes in the piece of SS
> pipe, and screw the SS pipe to the aluminum pipe with stainless steel
> screws.
>
> Regards,
> Harold O. Sprague
>
> > -----Original Message-----
> > From: SEAINT List [SMTP:bwslist(--nospam--at)bwsmithse.com]
> > Sent: Monday, March 04, 2002 4:28 PM
> > To: seaint(--nospam--at)seaint.org
> > Subject: aluminum welding
> >
> > Dear Collegues,
> >
> > A roofer discovered badly "eaten" base of 3" diameter aluminum pole of a
> > church cross on top of a bell tower.  The base of the pole was fixed by
> > encasing it in concrete grout which was contained in open pan made with
> > steel plates.  When I saw it, I was surprised to see the pole lasted as
> > long as it did (built in 1958) as I know aluminum reacts with concrete.
> >
> > My recommended remedial fix was to weld stainless steel fins on four
sides
> > of the cross pole and the mild steel pan.  The steel pan is secured to
the
> > tower roof framing.
> >
> > The contractor has contacted seveal welders who all told him that it is
> > not possible to weld stainless steel to aluminum.  Is this true?  I
would
> > appreciate any comments or resouce I could read.  My AWS D1.1 does not
> > cover welding of disparate base materials.
> >
> > Thank you,
> >
> > Brad Smith, SE
> >
> >
>
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