Table of Contents
- 1 Why a small diameter gas nozzle would be used?
- 2 What is the purpose of tungsten electrode used in TIG welding process?
- 3 How does gas tungsten arc welding work?
- 4 What are the advantages of using thoriated tungsten electrodes?
- 5 What kind of arc welding uses tungsten electrodes?
- 6 Why are tungsten alloys used in TIG welding?
Why a small diameter gas nozzle would be used?
As nozzle diameter increases, a longer laminar flow is produced. A smaller diameter nozzle with the same gas flow rate produces a more turbulent flow due to the gas velocity as it exits the nozzle. This shape is recommended to achieve the longest laminar flow.
Why is tungsten used in welding?
Tungsten electrodes are used when arc welding with the Tungsten Inert gas (TIG) process or when plasma welding. A tungsten electrode is used because it can withstand very high temperatures with minimal melting or erosion. Electrodes are made by powder metallurgy and are formed to size after sintering.
What determines the nozzle diameter that should be used for GTAW or GMAW?
Welding
| Question | Answer |
|---|---|
| When selecting a nozzle for GTAW or GMAW, what determines the nozzle diameter? | The volume of gas and the size of the joint opening. |
| Which shielding gas produces the deepest penetration when GMAW on carbon and low-alloy steel? | carbon dioxide |
What is the purpose of tungsten electrode used in TIG welding process?
Tungsten Inert Gas (TIG) welding is a popular type of welding that utilizes tungsten electrodes to join various metals. The tungsten electrode is a critical component in the process, as it channels the current required to establish the arc. The tungsten electrodes can be alloyed with a variety of metals.
What is tungsten why it is being used as an electrode in GTAW?
Electrode. The electrode used in GTAW is made of tungsten or a tungsten alloy, because tungsten has the highest melting temperature among pure metals, at 3,422 °C (6,192 °F). As a result, the electrode is not consumed during welding, though some erosion (called burn-off) can occur.
What is the advantage of using thoriated tungsten electrodes?
A thoriated tungsten electrode operates at a temperature well below its melting temperature compared to a pure tungsten electrode. This results in a much lower rate of consumption of the electrode during welding, which eliminates much of the “arc wander” associated with balled pure tungsten.
How does gas tungsten arc welding work?
Gas tungsten arc welding (GTAW) uses a nonconsumable tungsten electrode that must be shielded with an inert gas. The arc is established between the tip of the electrode and works to melt the metal being welded. The consumable filler metal is added either manually or by some mechanized process.
What is the purpose of inert gas used in TIG welding?
Inert Gas – Inert gases have no effect or reaction on the weld as it’s an inactive gas. The main purpose is to shield the weld from oxygen and water contamination.
What determines the nozzle diameter selected for GTAW?
When selecting a nozzle for GTAW or GMAW, what determines the nozzle diameter? The volume of gas and the size of the joint opening.
What are the advantages of using thoriated tungsten electrodes?
For instance, a thoriated tungsten electrode has a greater current carrying capacity than pure tungsten. This allows it to carry more heat and reduces the potential for tungsten inclusions. It also makes a weld arc easier to start and makes the geometry of that arc more stable.
What is the purpose of flux Why is it not needed in gas tungsten arc welding?
Heat from the arc melts the edges of the two workpieces and the filler rod to create the molten pool, which after cooling forms the weld. Because of the protective shielding of the weld area by the inert gas, a flux is not required for this process.
Why was gas tungsten arc welding developed?
Gas tungsten arc welding (GTAW) had its beginnings from an idea by C.L. Coffin to weld in a nonoxidizing gas atmosphere, which he patented in 1890. It was perfected in 1941, patented by Meredith, and named Heliarc welding. It was later licensed to Linde Air Products, where the water-cooled torch was developed.
What kind of arc welding uses tungsten electrodes?
GTAW “TIG” Welding demonstration. Gas tungsten arc welding ( GTAW ), also known as tungsten inert gas ( TIG) welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld.
What kind of gas is used in arc welding?
GTAW, also known as tungsten inert gas (TIG) welding, is a type of arc welding which produces the weld using a non-consumable tungsten electrode. Inert gases such as argon or helium are used to protect the area being welded from contamination and most, although not all, welding applications will require filler metal.
What is the purpose of a welding nozzle?
The main function of your welding nozzle is to direct the shielding gas into the weld puddle in the most effective manner possible. The best welding nozzle for you will depend largely on your welding application, joint access, and welding process. Some nozzle designs offer better gas coverage, while others offer better access.
Why are tungsten alloys used in TIG welding?
The success of TIG welding depends on a number of factors, one of which is using the correct type and size of the electrode. Tungsten alloys are used because of their hardness and resistance to high temperatures. Tungsten can withstand temperatures of up 3,400° C, which makes it suitable for arc welding.