Spotarc - EWM Tetrix 351 AW FW Operating Instructions Manual

Design and function
TIG welding

5.9.12.4 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 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)
When selecting the spotArc operating mode, the long interval is automatically preselected. When
selecting the Spotmatic operating mode, the short interval is automatically preselected. The user can
change the interval in the Configuration menu > see 5.18 chapter.
The up-slope and down-slope times should be set to "0" to achieve an effective result.
56
Up-/down-slope Pulsing AC
Yes Yes
No No
Figure 5-36
Display Display
Yes
No
EXIT
3s
099-000118-EW501
24.11.2017