Word: oxyhydrogen
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Dates: during 1920-1929
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...melted tungsten wire like an icicle, indicating that its heat was at least 7,000° F. Playing on a sheet of chrome steel the flame left molten pools behind it. Significance: steel girders could be welded silently instead of noisily riveted;* the welds would not (as when an oxyhydrogen flame is used) be oxidized and thus weakened, they would be annealing instead. This is important in joining aluminum, magnesium and other light metals.) Alloy metals, too refractory to work with by present methods, could be used for building, thus conserving the world's iron...
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