Yeswelder CT2050 Operator's Manual page 27

AC Square Wave TIG Welding
I0
In AC square wave TIG welding, the pre-flow time and post-flow time are the same with those in DC TIG welding, and others are de-
scribed as below.
Initial Current (I0), Welding Current (I1) & Pilot Arc Current (I2): The preset value of the three parameters is approximately the
Ÿ
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.
Ÿ
Cleaning Strength (100%*Tc/Tp): Generally, in AC welding, when taking the electrode as an anode, the current is called cathode
Ÿ
current. Its main function is to break up the oxidized layer of the workpiece, and the cleaning strength is the percentage of cathode
current holding in the AC period. This parameter is 10~40% commonly. When the value is smaller, the arc is concentrative, the
molten pool is narrow and deep, and when it is bigger, the arc is dispersive, molten pool is wide and shallow.
Process
SLOPPE DOWN
AC TIG
AC BALANCE
I1
tu
I0-Initial Current, I1-Welding Current, I2-Pilot Arc Current,
tu-Upslope Time, td-Downslope Time
tp-AC Period, tc-Cathode Current Time
Fig 16 AC Square Wave TIG Current Change Waveform
Parameter Description
PRE GAS Pre-flow
Istart Initial Current
SLOPE UP UpSlope Time
I1 Peak Current
Downslope Time
Istop Crater Current
POST GAS Post-flow
AC Hz AC Frequency
Clearance Width
tp tc
220V
0.1~15s
5~160A
0~10s
5-200A
0~15s
5~200A
0.1~15s
20-250Hz
5-99A: 20-80%
100-200A: 20-65%
24
I2
td
110V
0.1~15s
5~80A
0~10s
5~160A
0~15s
5~100A
0.1~15s
20-250Hz
5-99A: 20-80%
100-160A: 10-65%
Default
0.3s
15A
0s
50A
0s
15A
2s
85Hz