Power Fist SMART TIG AC/DC-200P Manuel De L'utilisateur page 15

V4.1
DUTY CYCLE
The welding unit's duty cycle rating defines how long the operator can weld before allowing the welding unit to cool. The
duty cycle is a percentage of a 10 minute period. The welding unit must cool for the remainder of the cycle. This welding
unit has a duty cycle rating of 15% at the rated output (see Specifications). This means that the user can weld for 1-1/2
minutes and then rest the welding unit for 8-1/2 minutes before using it again.
The welding unit may stop before the 1-1/2 minute duty cycle time limit. Reduce the wire speed slightly and tune in the
welding unit at the lowest wire speed setting that still produces a smooth arc. Welding with the wire speed set too high
causes excessive current draw and shortens the duty cycle.
INTERNAL THERMAL PROTECTION
Constantly exceeding the duty cycle can damage the welding unit. An internal thermal protector will open when the duty
cycle is exceeded, shutting OFF all welding unit functions except the cooling fan. Leave the welding unit turned ON with
the fan running. The thermal protector will automatically reset and the welding unit will function normally again once it
has cooled.
Wait at least another 10 minutes after the thermal protector opens before resuming welding. Starting before this
additional time may result in a shortened duty cycle.
SHORT CIRCUIT PROTECTION
Sometimes the tungsten electrode will touch the workpiece during the welding process. To prevent a short circuit from
damaging the workpeice or welding unit, this tool will detect the contact and if reduce the current if the contact exceeds
a time limit.
1. TIG/DC/IHF/LIFT: The current will drop to zero (0) within 2 seconds after contact. This will prevent burn off of the
tungsten electrode.
2. MMA: The current will drop to 10A if the contact lasts over 3 seconds.
WELDING OPERATION
The welding unit is suitable for all positions welding for various plates made of stainless steel, carbon steel, alloyed
steel, titanium, aluminum, magnesium, copper, etc., which is also applied to pipe installment, mould mend,
petrochemical, architecture decoration, car repair, bicycle, handicraft and common manufacturing solutions.
AC TIG is used to weld aluminum and magnesium workpieces. The shield gas used is either pure Argon, pure Helium or
an Argon/Helium mixture depending on the workpiece thickness, penetration depth required and the type of weld. The
weld is cleaner with less spatter.
DC TIG is used to weld stainless steel, nickel alloys, copper, titanium and less common metals/alloys. T The shield gas
used is either pure Argon, pure Helium or an Argon/Helium mixture. DC TIG welding produces a cleaner weld than AC
TIG.
The front control panel allow continuous and stepless adjustments of the welding parameters. This includes:
• Real time display for both welding current and voltage.
• Save and recall the current parameters or pre-set the welding parameters separately.
• Welding configuration: DC MMA, AC MMA, DC TIG, AC TIG, DC Pulse TIG and AC Pulse TIG. Parameters for AC
and Pulse can be set separately.
•
Ignition methods for TIG, LIFT and High Frequency (HF), with 2T, 4T, Spot, Repeat and I-Spot.
• TIG Spot function can be configured as four welding methods of TIG. The welding duration time can be adjusted
as well.
•
TIG repeat function. Swap between two different current levels while welding. This will improve the efficiency of
the welding torch.
• The I-Spot function is used as intelligent spot welding.
•
Welding suitable for stainless steel, carbon, copper, aluminum and Al-Mg alloy.
Visit www.princessauto.com for more information
SMART TIG AC/DC-200P Inverter Welding Machine 8560237
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