Jasic TIG 200 AC/DC Digital Series, Руководство оператора

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MMA (AC)
T0-Arc ignition time (0.01~1s)
T1-AC period (20ms)
(i.e. frequency=50Hz)
I0-Arc ignition current (20~300A)
I1-Welding current (20~250A)
In MMA AC mode, the adjustment of all parameters is the
same with that in MMA DC mode except that the arc force is
0 fixed.
TIG DC welding
In the DC TIG mode, 8 adjustable parameters are available
for this machine. These are described below.
Current (I3): This parameter can be set according to users’
own technical requirements.
Initial current (I1): It is the current when arc is ignited by
pushing the torch trigger, and it should be set according to
users’ own technical requirements. If the initial current is
high enough, arc is easier to ignite. However, it should not be
too high when welding thin plate, so as to avoid burn
through the work piece during arc ignition. In some operation
modes, the current can stay at the initial current value to
preheat the work piece or illuminate the weld area.
Pilot arc current (I5): In some operation modes, the arc does
not stop after current downslope but stays in the pilot arc
state. The working current in this state is called pilot arc
current, and it should be set according to users’ technical
requirements.
Pre-flow time: It indicates the time from the torch trigger is
operated to the arc being ignited in non-contact mode.
Commonly it should be longer than 0.5s to make sure that
the gas has been delivered to the welding torch in normal
flow before arc ignition. The pre-flow time should be
increased if the gas hose is long.
Post-flow time: It indicates the time from the welding current
being cut o
ff to the gas valve inside the machine being
closed. If it is too long, it will lead to a waste of shield gas; if
it is too short, it will result in the oxidation of weld bead and
electrode. When in AC TIG or for special materials, the time
should be longer.
Upslope time (tr): It indicates the time taken for the current to
rise from 0 to the pre-set value, and it should be set
according to users’ technical requirements.
Downslope time (td): It indicates the time taken for the
current to fall from the pre-set value to 0, and it should be
set according to users’ technical requirements.
Pulsed TIG DC welding
Current change in pulsed TIG welding
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.
Peak current (Ip): It should be adjusted according to users’
technical requirements.
Base current (Ib): It should be adjusted according to users’
technical requirements.
Pulsed frequency (1/T): T=Tp+Tb. It should be adjusted
according to users’ technical requirements.
Pulse duration ratio (100%*Tp/T): The percentage peak
current time holding in pulse period. It should be adjusted
according to users’ technical requirements.
AC square wave TIG welding
tc tp
I0 I2
0
I1
tu td
!
I0-Initial current, I1-Welding current, I2-Pilot arc current,
tu-Upslope time, td-Downslope time
tp-AC period, tc-Cathode current time
Current change in AC square wave TIG welding
In AC square wave TIG welding, the pre-flow time and post-
flow time are the same as in DC TIG welding. Others
parameters are described as below.
Initial current (I0), welding current (I1) & pilot arc current (I2):
The pre-set 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.
14
I
t
0
T0
I1
T1
I0
!