Gas Tungsten Arc Welding
Terms and Definitions
1. Gas Tungsten Arc Welding (GTAW) -- An arc welding process wherein coalescence (fusion) is produced by heating with an arc between a non-consumable tungsten electrode and the base metal utilizing an inert gas, argon, or helium that shields the weld zone from contamination by oxygen and nitrogen in the air.
(NOTE: TIG is a common term used to describe this process.)
2. Inert shielding gas -- A gas, which will not combine with other gases used to surround the weld zone and prevent contamination of the weld by oxygen and nitrogen in the air.
3. Tungsten electrode -- A practically non-consumable welding electrode used to create an intense arc between the tip of the electrode and the work.
4. High frequency current -- A high voltage low power source introduced into the A.C. weld current to start the arc and aid in oxide removal when welding aluminum.
5. Flowmeter -- A calibrated metering device used to regulate the flow of gases to the torch and measured in cubic feet per hour (cfh).
6. Collet -- A chucking device used to hold the tungsten in the torch.
7. Collet body or (chuck) -- A holding device for the collet.
8. Foot Control (Pedal or Remote) -- A device used by the welder to control welding current during the welding process.
9. Gas cup -- An attachment that fits on the end of the GTAW torch to direct the flow of shielding gas to the tungsten and weld zone.
10. Porosity -- Gas pockets or voids in metal.
11. Thermal conductivity -- The characteristic of a metal to conduct heat throughout its thickness, width, and length.
12. Metallurgy -- The science and technology of metals.
13. Aluminum oxide -- A thin film that forms on the surface of aluminum due to a reaction between the metal and oxygen in the air.
1. Gas Tungsten Arc Welding (GTAW) -- An arc welding process wherein coalescence (fusion) is produced by heating with an arc between a non-consumable tungsten electrode and the base metal utilizing an inert gas, argon, or helium that shields the weld zone from contamination by oxygen and nitrogen in the air.
(NOTE: TIG is a common term used to describe this process.)
2. Inert shielding gas -- A gas, which will not combine with other gases used to surround the weld zone and prevent contamination of the weld by oxygen and nitrogen in the air.
3. Tungsten electrode -- A practically non-consumable welding electrode used to create an intense arc between the tip of the electrode and the work.
4. High frequency current -- A high voltage low power source introduced into the A.C. weld current to start the arc and aid in oxide removal when welding aluminum.
5. Flowmeter -- A calibrated metering device used to regulate the flow of gases to the torch and measured in cubic feet per hour (cfh).
6. Collet -- A chucking device used to hold the tungsten in the torch.
7. Collet body or (chuck) -- A holding device for the collet.
8. Foot Control (Pedal or Remote) -- A device used by the welder to control welding current during the welding process.
9. Gas cup -- An attachment that fits on the end of the GTAW torch to direct the flow of shielding gas to the tungsten and weld zone.
10. Porosity -- Gas pockets or voids in metal.
11. Thermal conductivity -- The characteristic of a metal to conduct heat throughout its thickness, width, and length.
12. Metallurgy -- The science and technology of metals.
13. Aluminum oxide -- A thin film that forms on the surface of aluminum due to a reaction between the metal and oxygen in the air.
A. Applications of GTAW
- Makes top quality welds possible on most all metals and alloys used in industry.
- Welds possible in all positions through a wide range of metal thickness.
- Used particularly for aluminum and its alloys (even on very thin sections)
- No flux used and no post cleaning required.
- Arc and weld puddle clearly visible to welder.
- No slag or spatter.
- Makes excellent root pass on carbon and stainless steel pipe.
- Minimum of distortion and stress with heat concentrated in a small area.
- Welder has very close control of welding current.
Resources: Assignments:
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