Most cast aluminum can be TIG welded. If your trying to repair a crack or
broken piece, fit the two pieces together and use a grinder or rotary file
to gently shape the crack or seam between the broken pieces into a " U " or
" V " shape. Clean the seam and the area to be welded with a _clean_ wire
brush and then Acetone or denatured alcohol.
Use 4043 Aluminum alloy for your filler rod. This is readily available at
most welding supply shops. Set your TIG machine according to manufacturers
process specifications for aluminum 1/8" thick. If you have a pulse TIG I
would use it. You want to use only the amount of heat necessary to create a
weld puddle. Try to keep the HAZ as small as possible.
It should fill in pretty well. The 4043 runs in nicely into most cast pieces
that I've repaired. Just take your time and don't get the piece too hot.
James Walsh Jr.
Well, it worked okay. It acted just like other aluminum and it did fill in
nicely. I could not find any 4047(my local did not have it), so I used the
4043 that I had here. It did not turn out real pretty but I ground/filed it
down fairly flat anyway. It was a freebie for a buddy anyway. Thanks again!