Paul,
     Welding aluminum castings is not any more difficult that welding
extruded or rolled aluminum.

The problem is that the welded castings or any weldment for that matter have
to be heat treated to regain the origional strength of the material. If it is
only one piece, the heat treatment can be the most costly part of doing the
work.

If a welded assembly is a critical part in a machine, I wouldn't use it
unless it had be heat treated after welding.

Hope this helps out a little.

Wally

 
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