Table of Contents
Advertisement
2 TIG WELDING
2.2
Symbol and function explanations
Voltage Reducing Device (VRD)
The VRD function ensures that the open-circuit voltage does not exceed 35 V
when welding is not being carried out. This is indicated by a lit VRD LED.
The VRD function is blocked when the system senses that welding has started.
If the VRD function is activated and the open-circuit voltage exceeds the 35 V
limit, this is indicated by an error message (16) appearing in the display and
welding cannot be started whilst the error message is displayed.
Contact an authorised ESAB technician to activate the function.
TIG welding
TIG welding melts the metal of the workpiece, using an arc struck from a
tungsten electrode, which does not melt itself. The weld pool and the electrode
are protected by shielding gas.
DC, Direct current
A higher current produces a wider weld pool, with better penetration into the
workpiece.
Pulsed current
Pulsing is used for improved control of the weld pool and the solidification
process. The pulse frequency is set so slow that the weld pool has time to
solidify at least partially between each pulse. In order to set pulsing, four
parameters are required: pulse current, pulse time, background current and
background time.
Parameter settings
1.
Slope up
2.
Welding current
3.
Pulse time
4.
Background current
5.
Background time
6.
Slope down
7.
Gas post flow time
Slope up
The slope up function means that, when the TIG arc strikes, the current rises
slowly to the set value. This provides `gentler' heating of the electrode, and gives
the welder a chance to position the electrode properly before the set welding
current is reached.
0460 447 174
- 7 -
© ESAB AB 2018
Advertisement
Table of Contents
