[Alberg30] aluminum 6061 t-6

[RABBIT649 at aol.com]

This is interesting. Can it also happen from the heat of machining it?
Paul
#23 Ashwagh


In a message dated 3/28/02 6:47:01 PM Eastern Standard Time, 
chrishardy at tds.net writes:


> Subj:Re: [Alberg30] aluminum 6061 t-6
> Date:3/28/02 6:47:01 PM Eastern Standard Time
> From:    chrishardy at tds.net (chrishardy)
> Sender:    public-list-admin at alberg30.org
> Reply-to: <A HREF="mailto:public-list at alberg30.org">public-list at alberg30.org</A>
> To:    public-list at alberg30.org
> 
> 
> 
> 
> Ran across this at Brion Toss's rigging page I'm In the process of welding 
> up a radar mast for the aft deck of #296 I thought somebody may be 
> interested with all the talk of aluminum alloys....
> : "I am considering making a welded aluminum spar,out of 4'x 12' 6061 T6 
> plate. The boat I am building is a 34' aluminum cutter that will displace 
> 14000 pounds. I have used the Riggers Apprentice to figure the moments of 
> inertia and found a stock section that fits, now I would like to build a 
> octagon with longer sides that closely matches those dimensions. If you 
> have any advise, reasons why I shouldn't build it or know were I could read 
> more on this I would appreciate it. thanks Paul
> 
> Paul,6061 T-6 is a tempered aluminum alloy, welding will ruin the temper. 
> Retempering al is NOT a do it yourself project. Take a small piece of the 
> plate and run a weld across the middle, bend it and you will notice it is 
> very much softer in the welded area. Sorry. "
> 


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