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Welding (part 1)

Welding has long been considered as the art of uniting pieces of similar metals by ham- mering or compression when raised to a temperature short of the fusing point; but today a broader interpretation must be accepted to include autogenous soldering in which fusion occurs, and any added metal is similar to the pieces to be joined together in firm union. Such autogenous soldering has long been practised with lead. J Caldwell