It acts as a heat-sink & as a fixture. The heat-sink is to assist the part being welded from warping & you can help this by not concentrating the weld in only one area. The fixture is used to hold the parts while welding, but, you don't want to weld the part to the fixture. You can also use graphite.
Brass works fine also, any non ferous metal. Aluminum has a very low melting point.
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