Controls Explained; Weld Process Selection; Mma; Tig Hf - Weldclass Weldforce 202T Operating Instructions Manual

4.1 Weld Process Selection

1. Press 'Current Selection Button' until the desired Indicator Light is lit.
Figure 5

4.1.1 MMA

Stick/MMA welding

4.1.2 TIG HF

High Frequency Start TIG welding. This uses a high frequency arc to start the welding arc which eliminates
the need for the tungsten electrode to make contact with the job. This is easier to use and prevents tungsten
contamination. The disadvantage of HF ignition is that the high energy electrical pulse creates significant
electrical and radio signal interference, which limits its use around sensitive electronic equipment such as
some computers and CNC equipment.
See 12.2.2 for more information.

4.1.3 TIG LIFT

Lift Arc Start TIG welding. This requires the tungsten to be briefly touched on the work piece. As the
tungsten electrode is lifted back off the work piece the welding arc will be initiated. This does require more
skill.
See 12.2.1 for more information.

4 CONTROLS EXPLAINED

1