iWeld GORILLA POWERTIG 200 AC/DC GORILLA POWERTIG 200 AC/DC, User Manual

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3-2-3. DC PULSE TIG Welding
t
I1
I5
Initial
Welding current
I
tb
Upslope Preset Downslope Pilot Arc
tp
T
Ip
Ib
In pulsed TIG mode, all DC TIG parameters except current (I3) and another 4 adjustable
parameters are available for this machine. Describe them as below.
Values must be adjusted according to the current technical requirements.
It should be adjusted according to users’ technical requirements.
- Peak current (Ip): The highest current within a pulse.
- Base current (Ib): The lowest current within a pulse.
- Pulsed frequency (1/T): T=Tp+Tb. The number of impulses per min
- Pulse duration ratio (100%xTp/T): The percentage peak current time holding in pulse period.
3-2-4. AC square wave TIG Welding
I
1
I
2
I
0
AC square wave TIG welding - Current change during welding process
In AC TIG welding, the pre- fl ow time and post- fl ow time are the same with those in DC TIG
welding, and others are described as below.
- Initial current (I0), welding current (I1) & pilot arc current (I2): The preset value of the three
parameters is approximately the absolute average of the practical welding current, and can
be adjusted according to users’ technical requirements.
- Pulse frequency (1/tp): It can be adjusted according to users’ technical requirements.
- AC Balance - Cleaning effect (100%xTc/Tp): Generally, in AC welding, when taking the
electrode as anode, the current is called cathode current. Its main function is to break up the
oxidized layer of the workpiece, and the cleaning strength is the percentage cathode current
holding in the AC period. This parameter is 10~40% commonly. When the value is smaller, arc is
concentrative, molten pool is narrow and deep, and when it is bigger, arc is dispersive, molten
pool is wide and shallow.
tu: up-slpoe time; tp: AC period; tc: Cathode current time; td: down-slope time
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