Design and function
MIG/MAG functional sequences / operating modes
099-005224-EW501
08.11.2011
53
5.11.4
Spot welding
Figure 5-16
1. Start
• Press and hold torch trigger.
• Shielding gas is expelled (gas pre-flows).
• Wire feed motor runs at "creep speed".
• Arc ignites after the wire electrode makes contact with the workpiece; welding current flows.
• Changeover to the pre-selected wire speed after the set ignition time (tZn).
• The WF stops after the set spot welding time elapses.
• Arc is extinguished after the pre-selected wire burn-back time elapses.
• Gas post-flow time elapses.
2. End
• Release torch trigger.
NOTE
When the torch trigger is released, the welding process is also interrupted even before
the spot time elapses.
With fast tacking (time between two welding process under approx. 1.5 seconds) the gas
pre-flow, the creep process and also the ignition time (tZn) are not required.
