A weld made in a joint that has been placed to facilitate making the weld
100
reactor
A device used in arc welding circuits to minimize irregularities in the flow of the welding current.
100
slag
The non-metallic layer that forms on top of molten metal. It is usually a complex of chemicals that float to the top of the hot molten metal.
100
straight polarity
A non-standard term for direct current electrode negative.
100
T-joint
A weld joint produced when two members are perpendicular to one another, forming the shape of the letter “T”.
200
positioner
A device that moved the base material so that the weld joint is in a convenient welding position for hand-held and automatic welding.
200
residual stress –
Stress present in a member that is free of external forces or thermal gradients.
200
single phase –
An electrical circuit that produces only one alternating cycle within a 360 degree time span.
200
Stress corrosion crackings
Failure of metals by cracking under combined action of corrosion and stress, residual or applied. In brazing, the term applies to the cracking of stressed base metal due to the presence of a liquid filler metal.
200
tack weld
A weld made to hold parts of a weldment in proper alignment until the final welds are made.
300
postheating
The application of heat to an assembly after welding, brazing, soldering, thermal spraying, or thermal cutting.
300
resistance spot welding
(RSW) A resistance welding process that produces coalescence at the faying surfaces of a joint by the heat obtained from resistance to the flow of welding current through the workpieces from electrodes that serve to concentrate the welding current and pressure at the weld area.
300
shrinkage stress
A non-standard term for residual stress.
300
stub
The short length of welding rod or consumable electrode that remains after its use for welding.
300
tandem arc welding
A system of machine welding which uses two or more wire feeders each feeding a single welding electrode. Each wire feeder and welding electrode has its own power source to provide the required amperage, voltage, and polarity. Two electrode Tandem Arc systems are considerably more common that three or more electrodes in tandem.
400
preheat temperature
A specified temperature that the base metal must attain in the welding, brazing, soldering, thermal spraying, or cutting area immediately before these operations are performed.
400
response time
The amount of time is takes a welding power supply to go from open circuit voltage to welding voltage and amperage.
400
spatter loss
Metal loss due to spatter.
400
surface preparation
The operations necessary to produce a desired or specified surface condition
400
tensile strength
– The resistance of a material to a force which is acting to pull it apart.
500
purging
Cleaning or removing impurities from a device. A term generally used in welding with a shielding gas. The shielding gas cleans or purges the lines in which is flows prior to and post welding.
500
resistance welding
(RW) A group of welding processes that produces coalescence of the faying surfaces with the heat obtained from resistance of the work to the flow of the welding current in a circuit of which the work is a part, and by the application of pressure.
500
spot weld
A weld made between or upon overlapping members in which coalescence may start and occur on the faying surfaces or may proceed from the outer surface of one member. The weld cross-section (plan view) is approximately circular.
500
surfacing
The application by welding, brazing, or thermal spraying of a layer(s) of material to a surface to obtain desired properties or dimensions, as opposed to making a joint.
500
tungsten electrode
A non-filler metal electrode used in arc welding or cutting, made principally of tungsten. Used primarily in gas tungsten arc welding