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5.5.2 DC TIG welding
Current change in DC TIG
In DC TIG mode, 8 adjustable parameters are available for this machine. Describe them as 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 workpiece during arc ignition. In some
operation modes, the current does not rise but stay at the initial current value to preheat the workpiece or
illuminate.
Pilot arc current (I5):
In some operation modes, the arc does not stop after current downslope but stay 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 being pushed to 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 off to the gas valve inside the machine
being closed. If it is too long, it will lead to a waste of argon gas; if it is too short, it will result in the oxidation of
weld bead. When in AC TIG or for special materials, the time should be longer.
Upslope time (tr):
It indicates the time spent on current rising from 0 to the preset value, and it should be set
according to users’ technical requirements.
Downslope time (td):
It indicates the time spent on current dropping from the preset value to 0, and it should be
set according to users’ technical requirements.
TIG operation modes:
Please refer to Section 5.6.
Recommended parameters in TIG
Electrode dia. (mm)
Stainless steel thickness (mm) Maximum current (A) Maximum gas flow (l/min)
1
2
1
3
50
5
50~80
6
2
4
3
6
80~120
7
121~160
8
161~200
9
201~300
10
Smart 310 TIG Pulse AC/DC
Summary of Contents for Smart 310 TIG Pulse AC/DC
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