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Welding Dictionary
Select the first letter of the term you are looking for:
A
C
D
F
G
H
I
K
L
M
O
P
R
S
T
V
W
S
Semiautomatic Welding
- The equipment controls only the electrode wire feeding. The welding gun movement is controlled by hand.
Shielding Gas
- Protective gas used to prevent atmospheric contamination of the weld pool.
Single-Phase Circuit
- An electrical circuit producing only one alternating cycle within a 360 degree time span.
Spatter
- The metal particles blown away from the welding arc. These particles do not become part of the completed weld.
Spot Welding
- Usually made on materials having some type of overlapping joint design. Can refer to resistance, MIG or TIG spot welding.
Resistance spot welds are made from electrodes on both sides of the joint, while TIG and MIG spots are made from one side only.
T
TIG Welding (GTAW or Gas Tungsten Arc)
- Often called TIG welding (Tungsten Inert Gas), this welding process joins metals by heating them with a tungsten electrode which should not become part
of the completed weld. Filler metal is sometimes used and argon inert gas or inert gas mixtures are used for shielding. Consumables: tungsten electrode, filler metal, shielding gas.
Three-Phase Circuit
- An electrical circuit delivering three cycles within a 360 degree time span, and the cycles are 120 electrical degrees apart.
Torch
- A device used in the TIG (GTAW) process to control the position of the electrode, to transfer current to the arc, and to direct the flow of the sheilding gas.
Touch Start
- A low-voltage, low-amperage arc starting procedure for TIG (GTAW). The tungsten is touched to the workpiece; when the tungsten is lifted from the workpiece an arc is established.
Tungsten
- Rare metallic element with extremely high melting point (3410o Celsius). Used in manufacturing TIG electrodes.
V
Voltage
- Often called TIG welding (Tungsten Inert Gas), this welding process joins metals by heating them with a tungsten electrode which should not become part
of the completed weld. Filler metal is sometimes used and argon inert gas or inert gas mixtures are used for shielding. Consumables: tungsten electrode, filler metal, shielding gas.
Voltage-Sensing Wire Feeder
- Rare metallic element with extremely high melting point (3410o Celsius). Used in manufacturing TIG electrodes.
Volt-Amp Curve
- Graph that shows the output characteristics of a welding power source. Shows voltage and amperage capabilities of a specific machine.
W
Weld Metal
- The electrode and base metal that was melted while welding was taking place. This forms the welding bead.
Weld Transfer
- Method by which metal is transferred from the wire to the molten puddle. There are several methods used in MIG; they include: short circuit transfer, spray arc transfer,
globular transfer, buried arc transfer, and pulsed arc transfer.
Wire Feed Speed
- Expressed in in/min or mm/s, and refers to the speed and amount of filler metal fed into a weld. Generally speaking the higher the wire feed speed, the higher the amperage.
Workpiece Connection
- A means to fasten the work lead (work cable) to the work (metal to be welded on). Also, the point at which this connection is made. One type of work connection is made with an adjustable clamp.
Workpiece Lead
- The conductor cable or electrical conductor between the arc welding machine and the work.
content provided by Hobart Institute Of Welding Technology
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