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You can use either 5356 or 4043. The 4043 may match the casting color better than the 5356, and is also heat treatable if that is a concern. 5356 will produce a stronger weld, however the base metal will most likely be lesser in strength, so there probably wont be any advantage to welding with the 5356.
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I do agree with JonnyTIG regarding filler. 4043 is a bit more forgiving, but 5356 is stronger. I use 5356 95% of the time with the MIG process and 4043 on occasion. Take into consideration, if the casting is over 1/4" thick, much better results will be had by preheating the casting to 250-300 deg.. And the most important factor for a sound weld is the cleanliness of the aluminum. Aluminum is very finicky if there is any kind of contamination on the metal. Wire brushing with a SS brush and acetone vigorously will generally get the metal clean for a good weld joint. Hope that helps a bit.....Denny
I use 4043 alot [tig] on cast aluminum. Seems to work fine. i have repaired some of the coolest antique toy tractors with this rod, grant it strength is not a big issue, but it seems to weld good. Also repaired several transmission covers/cases also and seems to work good