Welding Aluminum Cold. Create an overlap to the length you require for the cold weld. Cold Weld Bonding Compound.
Friction welding is a solid-state joining process ie. Position the second length of aluminum or other metal such as copper over the end of the first piece. Welders should also preheat a thick piece of aluminum when welding it to a thin piece.
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The force required to hold the components in serrated clamps should exceed the upsetting force by more than 50 in the case of aluminium and more than 80 in the case of copper. If cold lapping occurs try using run-on and run-off tabs. It repairs fills and bonds to iron steel brass bronze aluminum and copper. Pure aluminum melts at 1200F 650C and the oxide that protects the metal melts at 3700F 2037C.