Difference between PTAW & PAW Processes
Ilkin Hasanov
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Types of Plasma ARC Welding
The two modes of operation for the plasma welding process are the non-transferred arc and the transferred arc.
1) Transferred PAW
The transferred PAW method uses direct polarity DC current. And in this method, the tungsten electrode can be allied to the –ve terminal and the metal can be allied to the +ve terminal. The arc produces among tungsten electrode as well as work portion. In this kind of method, both arc and plasma moved toward the work portion, which will enhance the heating capacity of the method. This type of PAW can be used to join solid / thick sheets.
2) Non-transferred PAW
The Non-transferred PAW method used direct polarity DC current and in this method the tungsten electrode can be connected to the –ve and the nozzle can be connected to the +ve pole. The arc generates among the nozzle as well as tungsten electrode within the torch, which will enhance the ionization of the gas within the torch. And the torch will transfer the ionized gas for further procedure. This type of PAW can be used to join thin sheets.
The difference between these two modes of operation is shown below. The transferred arc mode is used for welding metals. The gas tungsten arc process is shown for comparison.
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