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Welding Glossary R

Term Definition
Radiograph An image on film produced by X rays.
Range switch The coarse adjustment lever on a welding machine.
Rated Load The specifications of a power source in regards to amperage and voltage.
Rated output current The maximum current flow a welding machine can produce.
Reading the bead The process of visually inspecting the weld bead to determine whether the weld was made properly.
Regulator A mechanical device for accurately controlling the pressure and flow of gases employed in welding or cutting.
Rectified current Alternating current that has been made to flow in one direction only through use of a rectifier.
Rectifier An electronic device (such as a diode) that acts like a one-way valve as current flows through it.It converts AC current to DC current.
Reducing gas A gas that removes oxygen from the atmosphere by combining with oxygen.
Reference line The horizontal line drawn on a welding symbol.All information about the weld is positioned above or below this line.
Reinforcement of weld Weld metal on the face of the weld in excess of that required for the size of the weld, for the purposes of adding strength.
Remote contactor control A receptacle on the welding machine where the wire feed control mechanism is plugged in.
Repeatability The term used to describe a robotâs ability to make welds in the same place, and of the same quality, on part after part in production.
Residual stress The stress that remains in a body (such as a weldment) after the external forces or thermal gradients have been removed.
Resistance The property of a material that causes the flow of current in a circuit to be retarded.
Resistance seam welding (RSEW) A process that usually uses a round, rotating (wheel) electrode to make a continuous seam.A seam can also be formed with overlapping spot welds.
Resistance Spot Welding (RSW) A process joining two pieces of metal by passing current between electrodes placed on opposite sides of the pieces to be welded. There is no arc, but rather it is the resistance of the metal to the current flow that causes the fusion.
Resistance welding A process that uses the resistance of metals to electrical flow as a source of heat for welding.
Restarting the arc Establishing a new arc after changing electrodes, or after losing the arc due to faulty welding technique.
Restricted nozzle In plasma arc welding (PAW) the nozzle through which orifice gas flows to form the plasma.
Reverse polarity An electrode positive anode. Referring to DC current and causing electrons to flow from the base metal to the electrode.
Robot A device that uses a computer program to direct its movement as it completes a series of welds or other operations.
Robot cell A three-dimensional space enclosing the robot and its working area, usually fenced off for safety of employees.
Robot controller The computer and associated devices that direct a robot in carrying out the program developed for it.
Robotic welding system An industrial production operation using one or more robots, controllers, positioners, and other equipment to make a programmed series of welds on a weldment.
Robotic welding work station The location where a single robotic welder makes a specific set of welds.
Rockwell C hardness test A hardness test generally used for hard materials.The test utilizes a special piece of equipment to force a pointed diamond into the metal surface.
Root bend A test performed by bending a weld sample with the root of the weld on the outside of the bend.
Root face The distance from the root of the joint to the point where the bevel angle begins.
Root of weld That part of a weld farthest from the application of weld heat and/or filler metal side.
Root opening The distance between the two pieces at the root of the weld.
Root pass The first weld pass made into the root of the joint.
Root penetration The depth to which weld metal extends into the root of a weld joint.
Root reinforcement The distance that the penetration projects from the root side of the joint.
Rosin A substance used as a welding flux.It is derived form the sap of pine trees.
Rosin fluxes Those fluxes that are noncorrosive, and are recommended on electrical and electronic parts.
Running a bead The process of making a weld bead.
RMS Root Mean Square, is the 'effective' values of measured amperage.
RWMA The Resistance Welder Manufacturers Association.
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