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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 to the aluminum side of the bimetallic bonded joint, use a shielding gas with a welding grade mixture of 75% helium and 25% argon. For the steel welds to the steel side of the bimetallic bonded joint, use CO2 shielding gas (use argon or helium shielding gas with gas tungsten arc process).