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Friction <strong>Welding</strong><br />
In this process the two surfaces to be welded are rotated relative relative<br />
to each other under light normal pressure. When the interface<br />
temperature reaches due to frictional rubbing <strong>and</strong> when it reaches reaches<br />
the required welding temperature, sufficient normal pressure is<br />
applied <strong>and</strong> maintained until the two pieces get welded.