Gas-shielded TIG welding with a non-consumable electrode

TIG welding requires:

Welding inverters with a built-in steering system and a high-frequency generator are the most common used power sources nowadays. They also have falling characteristics.
They can supply DC or AC and DC. AC is used for welding aluminium and its alloys.
This kind of equipment may offer several functions such as increase of welding current, pulsing current and filling of a crater (gradual decrease of a welding current in order to stop a welding process).
On the market there are simple inverters for welding with a coated electrode and for TIG welding. An arc is started when a wolfram electrode touches a base material and therefore high frequencies are not used. This electrode does not get used because of a low current of 15A only. The arc starts when an electrode is heated and space between electrode and material ionised.

A minimal welding current for inverters is usually 3A. It is particularly useful while welding thin elements.