Weldclass WeldForce WF-201T AC/DC User manual

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 1
Edition 1
OPERATING INSTRUCTIONS
IMPORTANT!
To qualify for full 36 month warranty, you must register within 30 days of purchase. See inside for details.
Read these Operating Instructions Completely before attempting to use this machine. Save this manual and
keep it handy for quick reference. Pay particular attention to the safety instructions we have provided for
your protection. Contact your distributor if you do not fully understand anything in this manual.

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2© Weldclass 2019 | E.&O.E.
Congratulations & thank you for choosing WeldForce!
The WeldForce range from Weldclass provides market leading value, features and durability. WeldForce
machines have been designed with emphasis on robust construction, with simple and functional operation.
Register Your Warranty Now
Standard warranty without registration is 24 months.
To qualify for an extended full 36 month warranty on your purchase you must register within 30 days of
purchase.
Please register your warranty now by going to:
www.weldclass.com.au/weldforcewarranty
You will need;
a) A copy of your purchase invoice / receipt.
b) Your machine serial number which can be found on the technical data plate on the back of the
machine, or on the outside of the box that your machine came in.

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 3
1 CONTENTS
1CONTENTS...............................................................................................................................................3
2BASIC SPECIFICATIONS ............................................................................................................................7
3KNOW YOUR MACHINE...........................................................................................................................8
3.1 Machine Front................................................................................................................................8
3.2 Machine Rear .................................................................................................................................8
3.3 Control Panel..................................................................................................................................9
3.4 LCD Readout.................................................................................................................................10
3.5 Arc Parameter Chart.....................................................................................................................10
3.6 TIG Torch Controls ........................................................................................................................11
3.7 Symbols chart...............................................................................................................................12
4CONTROLS EXPLAINED..........................................................................................................................13
4.1 Weld Process Selection ................................................................................................................13
4.1.1 STICK.........................................................................................................................................13
4.1.2 HF TIG.......................................................................................................................................13
4.1.3 LIFT TIG.....................................................................................................................................13
4.2 Output Current Mode Selection...................................................................................................14
4.2.1 DC (Direct Current)...................................................................................................................14
4.2.2 AC (Alternating Current)...........................................................................................................14
4.3 Function Selection........................................................................................................................15
4.3.1 Spot Weld Function..................................................................................................................15
4.3.2 Pulse Welding Function............................................................................................................15
4.3.3 Normal Welding Function / Off................................................................................................15
4.4 Trigger Mode Selection ................................................................................................................16
4.4.1 2T (Standard Trigger)................................................................................................................16
4.4.2 4T (Latch Trigger)......................................................................................................................16
4.5 TIG Arc Parameters/Characteristics Settings................................................................................16
4.5.1 Pre-Flow Time / PRE GAS (36)..................................................................................................17
4.5.2 Start Current / START AMPS (37)..............................................................................................17
4.5.3 Slope Up / UP SLOPE (38).........................................................................................................17
4.5.4 Trough Current / TROUGH AMPS (39)......................................................................................17
4.5.5 Pulse Wave Width / WIDTH (41) ..............................................................................................17
4.5.6 Pulse Wave Frequency / FREQUENCY (40)...............................................................................17
4.5.7 Base/Peak Current / BASE/PEAK AMP (42) ..............................................................................17
4.5.8 Slope Down / DOWN SLOPE (44) .............................................................................................17
4.5.9 End Current / FINISH AMPS (45) ..............................................................................................17
4.5.10 Post Flow / POST GAS (46) ...................................................................................................17
4.5.11 Clean Width Area / AC BALANCE (43)..................................................................................18

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4© Weldclass 2019 | E.&O.E.
4.6 Remote Controls...........................................................................................................................18
4.6.1 Remote Control TIG Torch........................................................................................................18
4.6.1 Remote Foot Control (Optional Accessory)..............................................................................18
4.7 MMA/Stick Arc Parameters/Characteristics Settings ...................................................................19
4.7.1 Current / Amps (33) .................................................................................................................19
4.7.2 Hot Start Adjustment (34)........................................................................................................19
4.7.3 Arc Force Adjustment (Stick)....................................................................................................19
4.8 LCD Multi-Function Display (26)...................................................................................................20
4.9 Error/Over Temperature Indicator Light.......................................................................................20
5POWER SUPPLY .....................................................................................................................................22
5.1 Electrical Connection....................................................................................................................22
5.2 Extension Leads............................................................................................................................22
5.3 Generator Use ..............................................................................................................................22
5.3.1 Generator Size..........................................................................................................................22
5.3.2 Generator Quality & Warranty Limitations..............................................................................22
5.3.3 3 Golden Rules of Generator use .............................................................................................22
6OPERATING ENVIRONMENT..................................................................................................................23
6.1 Location........................................................................................................................................23
6.2 Ventilation....................................................................................................................................23
7BASIC SETUP..........................................................................................................................................24
7.1 Stick (MMA) Welding Setup .........................................................................................................24
7.2 TIG Welding Setup........................................................................................................................25
8ACCESSORIES, SPARE PARTS & CIRCUIT DIAGRAMS..............................................................................26
8.1 TIG Torch and Spares:...................................................................................................................26
8.2 Optional Accessories....................................................................................................................27
8.3 Machine Spare Parts: ...................................................................................................................27
8.4 Primary Schematic Circuit Diagram..............................................................................................29
9CARE & MAINTENANCE.........................................................................................................................30
9.1 Keep your Welding Machine in Top Condition.............................................................................30
9.2 Storing the Welder .......................................................................................................................30
10 GENERAL GUIDE TO WELDING .........................................................................................................31
10.1 Duty Cycle Rating .........................................................................................................................31
10.2 Choosing a Welding Process – MMA/Stick or TIG?......................................................................31
10.2.1 The Stick (MMA) Process .....................................................................................................31
10.2.2 The TIG Process....................................................................................................................32
10.3 Joint Preparations.........................................................................................................................33
11 STICK (MMA) BASIC WELDING GUIDE..............................................................................................35
11.1 Size of Electrodes .........................................................................................................................35
11.2 Storage of Electrodes ...................................................................................................................35

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 5
11.3 Electrode Polarity.........................................................................................................................35
11.4 Effects of Stick (MMA) Welding on Various Materials..................................................................35
11.4.1 High Tensile and Alloy Steels................................................................................................35
11.4.2 Manganese Steels................................................................................................................35
11.4.3 Cast Iron...............................................................................................................................35
11.5 Types of Electrodes ......................................................................................................................36
11.5.1 Mild Steel.............................................................................................................................36
11.5.2 Cast Iron...............................................................................................................................36
11.5.3 Stainless Steel ......................................................................................................................36
11.6 Suggested Settings for Typical Stick (MMA) Applications ............................................................36
11.7 MMA Welding Techniques ...........................................................................................................37
11.7.1 A Word for Beginners...........................................................................................................37
11.7.2 The Welder...........................................................................................................................37
11.7.3 Striking the Arc.....................................................................................................................37
11.7.4 Arc Length............................................................................................................................38
11.7.5 Rate of Travel .......................................................................................................................38
11.8 Making Welded Joints ..................................................................................................................39
11.8.1 Butt Welds............................................................................................................................39
11.8.2 Fillet Welds...........................................................................................................................40
11.8.3 Vertical Welds ......................................................................................................................41
11.8.4 Overhead Welds...................................................................................................................42
11.9 MMA (Stick) Troubleshooting.......................................................................................................43
12 TIG BASIC WELDING GUIDE..............................................................................................................45
12.1 TIG Electrode Selection and Preparation .....................................................................................45
12.1.1 Tungsten Electrode Selection & Polarity..............................................................................45
12.1.2 Preparing Tungsten ..............................................................................................................46
12.1.3 Shielding Gas for TIG Welding..............................................................................................47
12.1.4 Typical TIG Welding Settings................................................................................................47
12.2 Starting the Weld .........................................................................................................................48
12.2.1 Lift-Arc Ignition.....................................................................................................................48
12.2.2 HF Ignition............................................................................................................................48
12.3 Main Weld Current.......................................................................................................................49
12.3.1 DC Current............................................................................................................................49
12.3.2 AC Current............................................................................................................................49
12.3.3 Pulse Welding.......................................................................................................................50
12.3.1 AC Balance ...........................................................................................................................51
12.4 Finishing the Weld........................................................................................................................52
12.4.1 Down-Slope..........................................................................................................................52
12.4.1 Post Gas Flow.......................................................................................................................52

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6© Weldclass 2019 | E.&O.E.
12.4.1 Finish Current.......................................................................................................................52
12.5 TIG Welding Troubleshooting.......................................................................................................53
13 KNOWLEDGE & RESOURCES.............................................................................................................54
14 SAFETY..............................................................................................................................................54
14.1 Store and Retain this Manual.......................................................................................................54
14.2 Important Safety Information ......................................................................................................54
14.3 Welding Operation .......................................................................................................................54
14.4 Welding Safety Instructions & Warnings......................................................................................56
14.4.1 Personal Safety.....................................................................................................................57
14.4.2 Arc Rays can Burn Eyes and Skin..........................................................................................57
14.4.3 Noise Can Damage Hearing .................................................................................................57
14.4.4 Work Environment Safety ....................................................................................................58
14.4.5 Electricity Can Kill.................................................................................................................58
14.4.6 Fumes And Gases.................................................................................................................59
14.4.7 Fire & Explosive Risks...........................................................................................................60
14.4.8 Sparks & Hot Metal..............................................................................................................60
14.4.9 Gas Cylinders........................................................................................................................61
15 WARRANTY .......................................................................................................................................62
15.1 Warranty period ...........................................................................................................................62
15.2 Warranty Includes and Covers......................................................................................................62
15.3 Warranty Excludes / Does Not Cover ...........................................................................................62
15.4 Warranty Conditions ....................................................................................................................63

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 7
2 BASIC SPECIFICATIONS
Description
WeldForce WF-201T AC/DC
Part Number
WF-06172
Dimensions of Power Source (L x W x H)
455 x 305 x 145mm (including handle)
Weight of Power Source
8.5kg
Standard
AS 60974.1
Power Supply
240V +/- 15% 50hz Single Phase
Factory Fitting Supply Plug Rating
15A
Effective Input Current (I1eff)
15A
Maximum Input Current (I1max)
38A
Output Terminals
Dinse™ style 35-50
Protection Class
IP23
AC TIG (GTAW) Welding
Welding Current Output
10 – 200A
Duty Cycle
200A / 18.0V @ 30%
155A / 16.2V @ 60%
120A / 14.8V @ 100%
Nominal Open Circuit Voltage
65V
TIG Tungsten Size
1.6 – 2.4mm
DC TIG (GTAW) Welding
Welding Current Output
10 – 170A
Duty Cycle
170A / 16.8V @ 35%
140A / 15.6V @ 60%
110A / 14.4V @ 100%
Nominal Open Circuit Voltage
65V
TIG Tungsten Size
1.6 – 2.4mm
AC Stick (MMA) Welding
Welding Current Output
10 – 170A
Duty Cycle
170A / 26.8V @ 25%
140A / 25.6V @ 60%
110A / 24.4V @ 100%
Nominal Open Circuit Voltage
65V
MMA Electrode Size
1.6 – 4.0mm
DC Stick (MMA) Welding
Welding Current Output
10 – 170A
Duty Cycle
170A / 26.8V @ 25%
140A / 25.6V @ 60%
110A / 24.4V @ 100%
Nominal Open Circuit Voltage
65V
MMA Electrode Size
1.6 – 4.0mm
Table 1
For full machine specifications, refer to technical data plate on back of machine – or go to:
www.Weldclass.com.au/WF-201T

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8© Weldclass 2019 | E.&O.E.
3 KNOW YOUR MACHINE
3.1 Machine Front
1. Carry Handle
2. Control panel
3. TIG Torch Gas Connector
4. Negative (-) Welding Power Output Connection Socket
5. TIG torch Interface Connector
6. Positive (+) Welding Power Output Connection Socket
3.2 Machine Rear
7. Mains Power Switch
8. 240V AC Mains Power Input Lead
9. Gas Inlet Connection
3
4
5
6
2
1
Figure 1
7
8
9
Figure 2

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 9
3.3 Control Panel
10. Power On Indicator Light (POWER)
11. Stick (MMA) Process Indicator Light (STICK)
12. Process Selection Button (PROCESS)
13. High Frequency Start TIG Process Indicator Light (HF TIG)
14. Lift Arc Start TIG Process Indicator Light (LIFT TIG)
15. Spot Weld Function Indicator Light (SPOT)
16. Pulse Arc Function Indicator Light (PULSE)
17. Normal Arc Function Indicator Light (NORMAL/OFF)
18. Function Selection Button (FUNCTION)
19. Selection Knob
20. Mode Selection Button (MODE)
21. AC Arc Output Mode Indicator Light (AC)
22. DC Arc Output Mode Indicator Light (DC)
23. Latch Trigger Mode Indicator Light (4T)
24. Trigger Mode Selection Button
25. Normal Trigger Mode Indicator Light (2T)
26. LCD Readout
27. Error/Over Temperature Indicator Light
28. Arc Parameter Chart
Figure 3
15
22
10
12
13
17
19
20
21
23
24
25
26
28
11
14
16
0
27

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10 © Weldclass 2019 | E.&O.E.
3.4 LCD Readout
29. Percentage Setting Indicator Light (%)
30. Hertz/Frequency Setting Indicator Light (Hz)
31. Time/Seconds Setting Indicator Light (SEC)
32. LCD Screen
33. Amperage Setting Indicator Light (AMPS)
34. Hot Start Setting Indicator Light (HOT START)
35. Arc Force Setting Indicator Light (ARC FORCE)
3.5 Arc Parameter Chart
36. Pre-Gas Setting Indicator Light (PRE GAS)
37. Start Amps Setting Indicator Light (START AMPS)
38. Slope-Up Setting Indicator Light (UP SLOPE)
39. Trough Amps Setting Indicator Light (TROUGH AMPS)
40. Pulse Wave Frequency Setting Indicator Light (FREQUENCY)
41. Pulse Wave Width Setting Indicator Light (WIDTH)
42. Base/Peak Amp Setting Indicator Light (BASE/PEAK AMP)
43. AC Arc Balance Setting Indicator Light (AC BALANCE)
44. Slope-Down Setting Indicator Light (DOWN SLOPE)
45. Finish Amps Setting Indicator Light (FINISH AMPS)
46. Post-Gas Setting Indicator Light (POST GAS)
31
29
30
33
32
35
34
Figure 4
38
36
37
4039 42
41
Figure 5
43 44
45
46

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 11
3.6 TIG Torch Controls
47. Torch Trigger Button
48. Remote Control Amperage Potentiometer
Figure 6
47
48

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12 © Weldclass 2019 | E.&O.E.
3.7 Symbols chart
I
Power On
O
Power Off
Power On
Indication
Fault Indication
Caution / Hazard
Read Instruction
Manual
HF TIG Function
Lift Arc TIG
Function
Stick/MMA
Function
Spot Weld Function
Pulse Function
Alternating Current
(AC)
Amperage (current)
output
Voltage output
AC Arc Balance
2T/Normal Trigger
Function
4T/Latch Trigger
Function
Single phase
Inverter power
source AC/DC
Stick/MMA
(SMAW) Function
TIG (GTAW)
Function
Power Supply
Connection
Single Phase
Alternating Current
(AC)
Direct Current (DC)
–
Negative
+
Positive
Hertz (cycles/sec)
Duty Cycle
Amperage
(Current)
Voltage
Table 2

4 CONTROLS EXPLAINED
4.1 Weld Process Selection
1. Press ‘Process’ button (12) until the desired Welding Process Indicator Light (11, 13 or 14) is lit.
Figure 7
4.1.1 STICK
Stick/MMA welding
4.1.2 HF TIG
High Frequency Start TIG welding. This uses a high frequency arc to start the welding arc which eliminates
the need for the tungsten electrode to make contact with the job. This is easier to use and prevents tungsten
contamination. The disadvantage of HF ignition is that the high energy electrical pulse creates significant
electrical and radio signal interference, which limits its use around sensitive electronic equipment such as
some computers and CNC equipment.
See 12.2.2 for more information.
4.1.3 LIFT TIG
Lift Arc Start TIG welding. This requires the tungsten to be briefly touched on the work piece. As the
tungsten electrode is lifted back off the work piece the welding arc will be initiated. This does require more
skill.
See 12.2.1 for more information.
1

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14 © Weldclass 2019 | E.&O.E.
4.2 Output Current Mode Selection
1. Press ‘MODE’ button (20) until the desired Welding Process Indicator Light (21 or 22) is lit.
Figure 8
4.2.1 DC (Direct Current)
Direct Current. This is suitable for TIG welding ferrous (iron based) metals such as mild steel and
stainless steel, copper and titanium and also suitable for most Stick/MMA welding.
See 12.3.1 for more information.
4.2.2 AC (Alternating Current)
This is required for welding reactive metals such as Aluminium, Magnesium and Zinc. When reactive
metals are exposed to air they form an oxide layer that insulates the base metal and prevents welding
current flowing, it also contaminates the weld pool. Reverse current flow is required to break through/
clean off this oxide layer so that welding can take place, while the current flow during the positive
cycle does the majority of the heating of the weld pool area. This is also used for some specialty
Stick/MMA welding.
See 12.3.2 for more information.
1

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 15
4.3 Function Selection
1. Press ‘Function’ button (18) until the desired Function Indicator Light (15, 16 or 17) is lit.
NOTE: Functions are only available in TIG mode.
Figure 9
4.3.1 Spot Weld Function
Spot/Stitch Weld Time setting is adjustable from 0 – 10 seconds. This controls the length of time for the
weld. When the trigger button is pressed on the TIG torch the machine will weld for the set time and
then stop. This is great for producing very precise weld size or ensuring consistent weld size/length when
spot welding, tacking or stitch welding.
Spot Weld function is only available for HF TIG process and with DC Output.
4.3.2 Pulse Welding Function
Pulse welding mode switches the welding output between a high and low current output in a cyclical
manner. When used correctly this function has substantial benefits in the TIG welding process
including greater weld penetration for less work heat input and greater control of the weld pool.
The basic theory for setting the base current using pulse mode is that the trough current should be
sufficient to maintain the existing molten weld pool, while the peak current is sufficient to melt new
metal in order to move/expand the molten weld pool. Increased pulse frequency will have the effect
of making the arc more tightly focused which is useful for fine stainless work and similar.
Pulsing can also be used to help move the weld pool, this technique is useful for welding out of
position or with materials that have higher viscosity weld pool. Higher pulse duty setting will give
greater heat input, while lower pulse duty will have the opposite effect.
See 12.3.3 for more information.
4.3.3 Normal Welding Function / Off
This is standard non-pulse welding mode.
1

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16 © Weldclass 2019 | E.&O.E.
4.4 Trigger Mode Selection
1. Press ‘Trigger’ button (24) until the desired Trigger Mode Light (23or 25) is lit.
NOTE: Trigger mode selection only applies to TIG welding and is also disabled when the ‘Spot’ function is
turned on.
Figure 10
4.4.1 2T (Standard Trigger)
2T stands for Two Touch or ‘Standard Trigger’ mode. In this mode the trigger button is pressed and held
on to start welding, when the trigger button is released, the welding stops.
4.4.2 4T (Latch Trigger)
4T stands for Four Touch or ‘Latching’ mode. The trigger button is pressed once and released to start
welding and then pulled and released again to stop the welding. This function is useful for longer welds
as the trigger is not required to be held on continuously and thus reduced operator fatigue.
4.5 TIG Arc Parameters/Characteristics Settings
NOTE: The following parameter settings are only available in TIG welding modes.
Figure 11
1. Press ‘Selection’ knob down (19) until the desired Arc Parameter Setting Indicator Light (36 - 46)
is lit.
2. Rotate the ‘Selection’ knob to adjust the Setting
1
1
2

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 17
4.5.1 Pre-Flow Time / PRE GAS (36)
Pre-Gas (or Pre-Flow) setting is adjustable from 0 – 2 seconds. This controls the period of time the
shielding gas will flow when the torch is triggered before the arc starts. This purges the weld area from
atmospheric gas which could contaminate the start of the weld.
4.5.2 Start Current / START AMPS (37)
Available in 4T trigger mode only. This sets a welding current activated when the torch trigger button is
held on at the start of the weld. Once the trigger is released, the current will go through the upslope
(38) period if it is set, to the main welding current.
4.5.3 Slope Up / UP SLOPE (38)
Up Slope setting is adjustable from 0 – 10 seconds. When the trigger is activated, the welding current
will increase gradually over the time selected up to the main welding current.
4.5.4 Trough Current / TROUGH AMPS (39)
Available in Pulse mode only. This sets the level of the low/trough current of the pulse.
4.5.5 Pulse Wave Width / WIDTH (41)
When in Pulse mode: Sets the time proportion as a percentage between the peak current and trough
current. Neutral setting is 50% and the time period of the peak current and base current pulse is equal.
Higher pulse duty setting will give greater heat input, while lower pulse duty will have the opposite
effect. See 12.3.3 for more information.
When in Spot mode: Sets the portion of the weld cycle that is spent welding. For example if cycle time
is set to 10sec and with is 20% then the machine will weld for 2secs and pause for 8secs.
4.5.6 Pulse Wave Frequency / FREQUENCY (40)
Available in Pulse mode only. This sets the rate that the welding output alternates between the peak
and trough current settings. See 12.3.3 for more information.
4.5.7 Base/Peak Current / BASE/PEAK AMP (42)
When in Normal or Spot function this is the main welding current setting.
In Pulse mode this is the high/peak current of the pulse. See 12.3.3 for more information.
4.5.8 Slope Down / DOWN SLOPE (44)
Slope-Down time setting is adjustable from 0 – 10 seconds. When the trigger is released, the welding
current will reduce gradually over the time selected down to 0. This allows the operator to complete
the weld without leaving a ‘crater’ at the end of the weld pool.
4.5.9 End Current / FINISH AMPS (45)
Available in 4T trigger mode only, sets a welding current that is activated when the trigger is held on at
the end of the weld (to ‘unlatch’ the trigger before the weld is finished). If downslope (44) is set, the
current will go through the downslope period before going to the End Current setting. When the trigger
is released, the arc will stop.
4.5.10 Post Flow / POST GAS (46)
Controls the period of time the shielding gas continues to flow for after the arc is stopped. This protects
the weld area and torch tungsten from contamination while it is still hot enough to react with
atmospheric gases, after the weld is finished.

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18 © Weldclass 2019 | E.&O.E.
4.5.11 Clean Width Area / AC BALANCE (43)
Adjusts the balance as a percentage between the forward and reverse current cycles when welding in
AC output mode. The reverse part of the AC cycle gives the ‘cleaning’ effect on the weld material, while
the forward cycle melts the weld material. Neutral setting is 0.
Increased reverse cycle bias will give greater cleaning effect, less weld penetration and more heat in the
torch tungsten. This gives the disadvantage of reducing the output current that can be used for a given
tungsten size to prevent the tungsten overheating.
Increased forward cycle bias will give the opposite effect, less cleaning effect, greater weld penetration
and less heat in the tungsten.
Ideally for maximum effectiveness, the clean width/ AC balance should be set with as much forward
cycle bias as possible, while still maintaining a sufficient level of oxidisation removal for a contamination
free weld pool. The cleaner the non-ferrous metal is before welding, the more effective it is to weld.
This effect can also be used to reduce heat in the tungsten, allowing use of a pointed tungsten tip shape
for a more defined arc. See 12.3.1 for more information.
4.6 Remote Controls
4.6.1 Remote Control TIG Torch
The TIG torch supplied with the WF-201T AC/DC machine incorporates a Remote Control Amperage
Potentiometer on the handle (48). This can be used to change the Base/Peak current either before or
during welding.
4.6.1 Remote Foot Control (Optional Accessory)
An optional Foot control is available for use with the WF-201T AC/DC machine. (Part No. WC-06236).
1. Plug into the Torch Control Interface connection (5) instead of the interface plug on the TIG
torch.
2. Set the Trigger Mode to 2T (Refer to 4.4)
3. Set Function to Normal (Refer to 4.3)
On this Foot control the first stage of the foot movement activates the ‘Trigger’ function. You will hear
the foot control ‘click’ at this point.
After this point the rest of the foot movement regulates the Base Current output.
The Adjustment knob on the Foot control calibrates the maximum Base Current (as a portion of the
base current set on the machine) that is represented when the Foot Pedal is right down.
Figure 12
Foot Pedal
Adjustment Knob
Interface cable

WF-201T AC/DC
© Weldclass 2019 | E.&O.E. 19
4.7 MMA/Stick Arc Parameters/Characteristics Settings
NOTE: The following parameter settings are only available in MMA/Stick welding mode.
Figure 13
1. Press ‘Selection’ knob down (19) until the desired Arc Parameter Setting Indicator Light (33,34 or
35) is lit.
2. Rotate the ‘Selection’ knob to adjust the Setting
4.7.1 Current / Amps (33)
This is the main welding current.
4.7.2 Hot Start Adjustment (34)
Hot Start setting is adjustable from 0 – 100%. Hot start provides extra power when the weld starts to
counteract the high resistance of the electrode and workpiece as the arc is started. It makes igniting the
electrode easier and prevents it from sticking when cold.
4.7.3 Arc Force Adjustment (Stick)
Arc Force setting is adjustable from 0 – 100%. Sometimes called ‘Dig’ or ‘Arc Control’. A Stick welder is
designed to produce constant output current (CC). This means with different types of electrode and arc
length; the welding voltage varies to keep the current constant. This can cause instability in some
welding conditions as Stick welding electrodes will have a minimum voltage they can operate with and
still have a stable arc.
Arc Force control boosts the welding power if its senses the welding voltage is getting too low. The
higher the arc force adjustment, the higher the minimum voltage that the power source will allow. This
effect will also cause the welding current to increase. 0 is Arc Force off, 100 is maximum Arc Force. This
is practically useful for electrode types that have a higher operating voltage requirement or joint types
that require a short arc length such as out of position welds.
1
2

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20 © Weldclass 2019 | E.&O.E.
4.8 LCD Multi-Function Display (26)
When welding is not in progress the LCD Readout (26) displays the setting selected/being adjusted
using the Selection Knob (19).
During welding the LCD Readout (26) displays the actual welding current.
The parameter setting displayed is indicated by the LEDs beside the display:
SEC: Time (31)
%: Percentage (29)
Hz: Frequency (30)
AMPS: Current/Amperage (33)
If left inactive for several seconds, display will revert back to main welding current setting.
Also displays error codes if the protection system (27) is activated.
4.9 Error/Over Temperature Indicator Light
Error/Over Temperature Indicator Light (30) illuminates when duty cycle is exceeded and thermal
protection is activated. When thermal protection is activated, welding output will be disabled until
machines cools sufficiently and overload indicator lamp goes out.
This may also activate if there are electronic circuit failure issues.
When there is an error the LCD screen will display an error code to indicate what the error is. Refer
to the following table for error code explanations.
Code
Error
Solution
E01 –
E09
The machine has exceeded its safe
temperature or duty cycle.
Ensure the cooling fan is working. If not,
contact supplier.
Wait for machine to cool down.
E13
Input voltage has fallen below safe
tolerance level.
Check the voltage of your power supply.
E14
Input voltage has risen above safe
tolerance level.
Check the voltage of your power supply.
E15
Excessive current through IGBT
electronics due to machine misuse or
technical fault.
Ensure usage of machine is in line with
guidelines in this manual.
Figure 14