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OPEN-CIRCUIT VOLTAGE. The voltage between the output terminals of the welding machine when no current is in the welding circuit.
OVERHEAD POSITION. The position of welding wherein welding is performed from the underside of a joint.
OVERLAP. Protrusion of weld metal beyond the toe or root of the weld.
OXIDIZING FLAME. A flame having an oxidizing effect (excess oxygen).
OXYACETYLENE WELDING. A gas-welding process wherein coalescence is produced by heating with a gas flame or flames obtained from the combustion of acetylene with oxygen, with or without the application of pressure and with or without the use of filler metal.
OXYGEN LANCE. A length of pipe used to convey oxygen to the point of cutting in oxygen-lance cutting.
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