Page 116 - Welding of Aluminium and its Alloys

TIG welding 101

6.4 Inventor-based multi-function MMA/TIG power source capable of
providing square wave AC for the welding of aluminium. Courtesy of
Kemppi (UK) Ltd.

can seriously damage electronic circuits, can cause malfunctions and
uncontrolled movements of robotic systems and NC machines and can
affect the functioning of telephones and computer networks. Where HF
current is used precautions must be taken to prevent damage by adequate
shielding of equipment and electronic circuits, perhaps by the use of a
Faraday cage.

6.2.1 Square wave power sources
The most modern equipment (Fig. 6.4) uses solid state circuitry and is
capable of providing a square wave AC current rather than the sinusoidal
wave form of the older equipment.These power sources can be adjusted to
vary the wave frequency and the balance of positive and negative current