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Filler rod selection between Al 4043 and Al A356

Posted: Thu May 19, 2016 2:03 pm
by cancun555
I have a housing made out of 356.0-T430 which has a crack in it.

Please help me select best filler rod for filling it up? Al 4043 or Al A356?

I was going to choose A356 because of similar composition and slightly higher strength properties. What do you guys think? Also remember this is a sand cast aluminum. I think A356 is heat treatable and 4043 isnt