Gas tungsten arc welding or TIG welding
GAS TUNGSTEN ARC WELDING (GTAW):
Gas tungsten arc welding is also called as TIG welding. In GTAW welding, the electric arc is produced between a nonconsumable tungsten electrode and the work piece. There is an electrode holder in which the non-consumable tungsten electrode is fixed when the arc is produced.
By supplying the electric power between the electrode and the work piece, the insert gas from the cylinder passes through the nozzle of the welding head around the electrode. The insert gas surrounds the arc and protects the weld from atmospheric effects and hence, defect free joints are made.
Filler metal may or may not be used. When a filler metal is used, it is usually fed manually into the weld pool. An electrode used in this process is tungsten. It has high melting point (330°C), Therefore, it will not be melted during welding. This process is used for welding steel, aluminium, Cast iron, Magnesium, Stainless steel, Nickel based alloys, copper based alloys and low alloy steel. It is also used for combining the dissimilar metals in hard facing and in surfacing of metals. This process is used for the metals having thickness less than 6.5mm
Advantages:
1. No flux is required.
2. The welding speed is high.
3. It can be used for both ferrous and non ferrous metals.
4. It produces high quality weld.
5. No weld cleaning is necessary.
6. The are and weld pool are clearly visible during welding.
Post a Comment