6.1.2 Arc ignition with INTIG Energy
The highly intelligent processor ensures that the ideal ignition energy is automatically chosen
depending upon the actual weld current setting, this applies not only for HF, but also for the
Lift-Arc ignition sequence.
When the selector switch is set to position ´"HF On", the high-frequency ignition unit is
ready for operation. To ignite the arc, the electrode must be held about 3 to 5 mm above the
workpiece. When the torch button is pressed, the shielding gas is pre-ionised by a high-
voltage, the current flows between the end of the electrode and the workpiece so that the
main arc is established. The ignition of the arc without contact between the tungsten
electrode prevents tungsten inclusion in the weld. once the arc has successfully been ignited
the high-frequency ignition unit is switched off automatically during welding.
When the selector switch is set to position "HF Off", contact ignition can also be carried
out using the processor control ignition system (Lift Arc) to strike the arc. In order to ignite the
welding arc, the tip of the electrode must be placed on the workpiece and the torch button
depressed. The processor control system reduces the ignition current so that the tip of the
electrode does not heat up. The electrode is then gradually lifted away from the workpiece,
this action ignites the arc under the system processor control, this results in arc ignition
without HF and also minimum wear on the tungsten electrode. This process is essential
when welding in areas where sensitive electronic equipment is in operation (e.g. repair welds
on CNC-controlled machines) and where there may be a risk of damage caused by high-
voltage.
When the selector switch is set to position "Electrode“, the HF ignition system is
automatically disabled.
The electrode diameter depends on the welding current. A diameter of 1.6 mm is
recommended for welding currents up to 70 A and 2.4 mm for higher currents.
6.1.3 The Non-latch torch button operation mode sequence
Step 1: Activate torch button
° The solenoid valve for the shielding gas is energised
° The arc ignition cycle starts after the fixed gas pre-flow time (0.1 sec.) has elapsed
° The set welding current is automatically reached after the up-slope time (0.1 sec)
has elapsed.
Step 2: Release torch button
° The current falls to 20% of the set welding current after the down-slope time has
elapsed, the arc is then automatically switched off.
° The shielding gas continues to flow for the duration of set gas post-flow time.
Non-latched welding mode is recommended for rapid, controlled tacking and manual spot
welding.
6.1.4 The Latched torch button operation mode sequence
Step 1: Activate the torch button
° The solenoid valve for the shielding gas is energised
° The arc ignition cycle starts after the fixed gas pre-flow time (0.1 sec.) has elapsed
° The welding current rises to 50% of the value set on the main current potentiometer