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Open Circuit Voltage (OCV) - As the name implies, no current is flowing in the circuit because the circuit is open. The voltage is impressed upon the circuit, however, so that when the circuit is completed, the current will flow immediately. For example, a welding machine that is turned on but not being used for welding at the moment will have an open circuit voltage applied to the cables attached to the output terminals of the welding machine. Output Control - An electrical switch that is used to energize or de-energize output terminals of a welding machine. In some types of welding machines they can be of solid state design, with no moving parts and thus no arcing of contact points. Overhead Position - When the axis angle is from 0° – 80° and the face rotation is from 0° – 80° or 280° – 360° for groove welds or from 0° – 125° or 235° – 360° for fillet welds, the weld position is considered to be in the overhead position. Occupational Safety and Health Administration (OSHA) – An organization within the U.S. Department of Labor which sets standards for employers to ensure safe and healthful working conditions for employees. Outlet Pressure (P2; Delivery Pressure; Downstream Pressure) – The pressure of the fluid from the discharge connection of a control device. Oxidizer – A chemical reagent which causes oxidation of other substances and is thereby reduced.
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