TIG is also referred to as GTAW (Gas Tungsten Arc Welding) and Heliarc®. MIG also is referred to as GMAW (Gas Metal Arc Welding). TIG welding is also called Heliarc® welding. ... The arc is started with a tungsten electrode shielded by inert gas and filler rod is fed into the weld puddle separately.
You can refer book for TIG Welding by Indian Author.
Book Name-A Text-Book of Welding Technology
Author Name-by O.P. Khanna
Link : http://www.amazon.in/Text-Book-Welding-Technology-P-Khanna/dp/8189928368