 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
Reverse Polarity - The machine operates on reverse polarity when the electrode holder cable is connected to the terminal marked POSITIVE, GROUND, WORK, or PLUS SIGN. The cable to the ground clamp should be connected to the connection marked NEGATIVE, LECTRODE, or MINUS SIGN. If the machine possesses a polarity changing switch, the switch should be in the position marked POSITIVE or REVERSE. Root Penetration - The depth that a weld extends into the root of a joint. Rectifier - An electrical device that allows the flow of electricity in basically only one direction. Its purpose is to change alternating current (AC) to direct current (DC). Residual Stress - The stress remaining in a metal resulting from thermal or mechanical treatment or both. When welding, stress results when the melted material expands and then cools and contracts. Residual stresses can cause distortion as well as premature weld failures. Resistance - The opposition to the flow of electrical current in a conductor. This opposition to current flow changes electric energy into heat energy. Resistance is measured in ohms with an ohm meter. Resistance Spot Welding (RSW) - A process in which two pieces of metal are joined by passing current between electrodes positioned on opposite sides of the pieces to be welded. There is no arc with this process, and it is the resistance of the metal to the current flow that causes the fusion. Reverse Polarity - An old nonstandard term denoting electron flow from the workpiece to the electrode. Root - A nonstandard term to denote joint root or weld root. Root Opening - The separation of the members to be welded together at the root of the joint. Rare Gas – Refers to those constituents of air which comprise less than 1% of air and are generally considered inert such as argon, helium, krypton, neon and xenon. Reactive Hazard – See “EPA Hazard.” Relief Valve – A type of pressure relief device which is designed to relieve excessive pressure, and to reclose and reseal to prevent further flow of gas from the cylinder after reseating pressure has been achieved. Restrictive Flow Orifice (RFO) – A safety device place in the outlet of a cylinder valve that is intended to limit the release rate of a hazardous gas to a maximum specified range in the event of the inadvertent opening of the valve or failure of the system downstream of the valve outlet.
|
|
 |
| Glossary | Contact | Site Map | (518) 465-5229, (845) 338-6247 |  |