Dear Readers,
This continues from Part-8. Successful work execution heavily relies on both written and oral communication. For effective communication, understanding the acronyms and terms used in welding is essential.
Quality Assurance (QA) – The practice involves utilizing a defined set of processes for systematic monitoring and evaluation to ensure product quality.
Quality Control (QC) – The process of confirming that a product meets an established set of specifications.
Radiation – The light emitted during arc welding contains intense ultraviolet radiation (UVR). In the absence of a barrier, this radiation is emitted into the surrounding environment.
Radiography – The weld is x-rayed, and it will show even the minutest weld defects. (Slag inclusion, porosity, or undercut!)
Rake Angle – Slope of a shear knife from end to end.
Rated Load – The amperage and voltage the power source is designed to produce for a given specific duty cycle period. For example, 300 amps, 32 load volts, at 60 percent duty cycle.
Reaction Stress – The residual stress which could not otherwise exist if the members or parts being welded were isolated as free bodies without connection to other parts of the structure.
Reactor (arc welding) – A device used in arc welding circuits for the purpose of minimizing irregularities in the flow of welding current.
Reducing Flame – A gas flame that has a reducing effect, due to the presence of excess fuel.
Regulator – A device used to reduce cylinder pressure to a suitable torch working pressure.
Reinforcement – Weld metal, at the face or root, in excess of the metal necessary to fill the joint.
Residual Stress – Stress remaining in a structure or member, as a result of thermal and/or mechanical treatment. Stress arises in fusion welding primarily because the melted material contracts on cooling from the solidus to room temperature.
Resistance Butt Welding – A group of resistance welding processes in which the weld occurs simultaneously over the entire contact area of the parts being joined.
Resistance Spot Welding (RSW) – Uses electrical current which is passed through the metal. It does not require a filler rod. The process is easy to automate and requires low heat input.
Resistance Welding – A group of welding processes in which fusion is produced by heat obtained from resistance to the flow of electric current in a circuit of which the workpiece is a part and by the application of pressure.
Reverse Polarity – The arrangement of direct current arc welding leads with the work as the negative pole and the electrode as the positive pole of the welding arc.
Robotic Welder – A fully or partially automated machine equipped with a welding head and connected to a welding power source. The movable portion of a robotic welder is normally a robotic arm.
Rods – Same as welding electrode. At site or shop, nobody asks for more "electrodes", they ask for more rods.
Root Crack – A crack at the root of a weld.
Root Edge – The edge of a part to be welded which is adjacent to the root.
Root Face – That portion of the groove face adjacent to the root of the joint.
Root of Joint – That portion of a joint to be welded where the members approach closest to each other. In cross section the root of the joint may be either a point, a line or an area.
Root of Weld – The points, as shown in cross section, at which the back of the weld intersects the base metal surfaces.
Root Penetration – How far the Filler Metal is penetrating into and through the Root Opening.
Root Reinforcement – Reinforcement of weld at the side other than that from which welding was done.
Root Surface – The exposed surface of a weld on the side other than that from which welding was done.
0 comments:
Post a Comment