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RE: aluminum welding

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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

Harold O. Sprague

> -----Original Message-----
> From:	SEAINT List [SMTP:bwslist(--nospam--at)]
> Sent:	Monday, March 04, 2002 4:28 PM
> To:	seaint(--nospam--at)
> 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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