TIG Welding or GTAW 
Understand the process principle and equipment
Understand different parts of the process and equipment
Understand the polarity in TIG welding
Understand the functions of the tungsten electrode, polarity and    shielding gases
Know how the electrode classification system work
Know the advantages, limitations and application of the TIG Welding
full training video for IWE, AWS CWI and CSWIP