In TIG welding, one of the main parts is “shielding gas” without which the process is impossible. When an electric arc passes the electrode, it melts down the rod to weld the metal parts. The electric arc may burn the electrode and contaminate the welding field without shielding gas and will not be able to penetrate the workpiece.
Currently, as beginner, if you are reluctant to use the welding machines with gas, you may use such machines which have multi-process functions like TIG, Stick welding and Plasma Cutter.