Arc Ignition; Hf Ignition; Automatic Cut-Out; Spotarc - EWM Tetrix 352 Synergic Operating Instructions Manual

Design and function
TIG welding

5.2.17 Arc ignition

5.2.17.1 HF ignition

The arc is started without contact from high-voltage ignition pulses.
a) Position the welding torch in welding position over the workpiece (distance between the electrode tip
and workpiece should be approx. 2-3 mm).
b) Robot start signal (high voltage ignition pulses ignite the arc).
c) Ignition current flows. The welding process is continued according to the operating mode selected.
End the welding process: Robot stop signal or other signals depending on the operating mode
selected.

5.2.17.2 Automatic cut-out

The automatic cut-out stops the welding process after fault periods have elapsed. HF, gas and open
circuit voltage (power unit) are shut off.
When using RINT X1x or BUSINT X1x, the automatic cut-out depends on the time defined for TZ-ZÜND
(PC300.net). An error message is issued.

5.2.18 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 spot welding operating modes (spotArc/Spotmatic) can be used with two different intervals, i.e. a
"long" or "short" interval, which are defined as follows:
Interval Setting range
Long 0.01–20.0 s (10 ms)
Short 5–999 ms (1 ms)
38
Figure 5-19
Up-/down-slope Pulsing AC
Yes Yes
No No
Display Display
Yes
No
099-000141-EW501
20.11.2017