The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 273
... Metal Age cultures The Metal Age in Europe commenced in the early 3rd millennium BC , when the peoples around the Aegean Sea began to work copper , under the influence of the neigh- bouring peoples in the Near East . Gradually by 2500 ...
... Metal Age cultures The Metal Age in Europe commenced in the early 3rd millennium BC , when the peoples around the Aegean Sea began to work copper , under the influence of the neigh- bouring peoples in the Near East . Gradually by 2500 ...
Page 738
... metal was hammered sufficiently at a yellow or white heat , joining or welding took place . Welded blades were ... metal of the required size . The heat may be supplied by electricity or by a gas flame . Electric resistance welding can ...
... metal was hammered sufficiently at a yellow or white heat , joining or welding took place . Welded blades were ... metal of the required size . The heat may be supplied by electricity or by a gas flame . Electric resistance welding can ...
Page 739
Base metal types Gas shielding Deep- penetra- tion welds Heat sources. The base metal adjacent to the weld , or the heat - af- fected zone , is subjected to a range of temperature cy- cles , and its change in structure is directly ...
Base metal types Gas shielding Deep- penetra- tion welds Heat sources. The base metal adjacent to the weld , or the heat - af- fected zone , is subjected to a range of temperature cy- cles , and its change in structure is directly ...
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