Pure oxygen, instead of air, is used to increase the flame temperature to allow localized melting of the workpiece material (e.g. A common propane/air flame burns at about 2,250 K (1,980 °C; 3,590 °F), During the early 20th century, before the development and availability of coated arc welding electrodes in the late 1920s that were capable of making sound welds in steel, oxy-acetylene welding was the only process capable of making welds of exceptionally high quality in virtually all metals in commercial use at the time.
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