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Step 7: Braze the Aluminum. Rub the brazing rod along the channel until it's filled in and finish it off with some more heat. If you don't get the aluminum hot enough the ... Using a propane torch and some aluminum brazing rods is a quick way to bonding aluminum without using a welder.
For welds where machining is not required, and where the weld is expected to rust like the cast iron, Lincoln FerroweldÂ® stick electrode can be used. To Heat, or not to Heat In general, it is preferred to weld cast iron with preheat--and lots of it.