Spotarc - EWM L2.00 DC Expert 3.0 TIG Operating Instructions Manual

Functional characteristics
TIG welding
5.1.7.4

spotArc

This process is suitable for tack welding or joint welding of metal sheets made from steel and CrNi alloys
up to a thickness of approximately 2.5 mm. Metal sheets of different thicknesses can also be welded on
top of one another. As this is a one-sided process, it is also possible to weld metal sheets onto tubular
sections such as round or square pipes. In arc spot welding, the arc melts through the upper metal sheet
and the lower metal sheet is melted onto it. This produces flat, fine-textured welding tacks which require
little or no post weld work, even in visible areas.
The up-slope and down-slope times should be set to "0" to achieve an effective result.
As an example the process is shown with HF ignition. Arc ignition with lift arc is also possible, how-
ever > see 5.1.6 chapter.
Sequence:
• Press torch trigger and hold down.
• The gas pre-flow time elapses.
• HF start pulses jump from the electrode to the workpiece. The arc ignites.
The welding current flows and immediately assumes the value of the start current
• HF switches off.
• The welding current ramps up to the main current
The process ends when the set spotArc.time elapses or by releasing the torch trigger. With the spotArc
function enabled, the Automatic Puls pulse variant is activated as well. If required, the function can be
disabled by pressing the pulsed welding push-button.
46
Figure 5-19
Figure 5-20
(AMP) within the set up-slope time .
099-00L200-EW501
13.05.2022