If possible it is best to use red brass brazed to copper the threaded onto the metal, adding a third dissimilar metal does not sound like a good idea. the red brass and copper will not react with each other and the metal will act as the anode (if the mass of the anode is much greater you will see very little reaction).
Hobart MIG Welding Wire, ER4043 Aluminum, .030in., 1-Lb. Spool, Model# H381806-R18
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WIRE DIAMETER (IN.)
SPOOL SIZE
- ER4043 is a general-purpose type aluminum welding wire .030 - 1 lb. spool.
- It contains silicon additives, which result in improved fluidity (wetting action) of the weld pool and also produces a weld less sensitive to cracking.
- Its bright weld finish makes it a popular choice of welders. It can be used to weld various grades of aluminum.
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