Weldclass Weldforce 202T User manual

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 1
Weldforce 202T
HF Pulse AC/DC TIG
Edition 1.6
OPERATING INSTRUCTIONS
 IMPORTANT!
To qualify for full 24 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 2020 | E.&O.E.
Congratulations & thank you for choosing Weldclass!
The Weldforce range from Weldclass provides market leading value, features and durability.
Register Your Warranty Now
To qualify for an extended warranty, you must register within 30 days of purchase.
Full details on warranty period and terms can be found at www.weldclass.com.au/WarrantyInfo
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.
Satisfaction Guarantee
For full details on our satisfaction guarantee, refer to www.weldclass.com.au/mbg
IMPORTANT !
If using TIG Torch with Remote (Amperage) Control:
Remote Adaptor MUST be connected to TIG Torch at all times to protect
machine from HF interference damage. Refer to section 7.2 of this manual
for further information.

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 3
1CONTENTS
1CONTENTS...............................................................................................................................................3
2SPECIFICATIONS ......................................................................................................................................7
3KNOW YOUR MACHINE...........................................................................................................................8
3.1 Machine Rear .................................................................................................................................8
3.2 Machine Front................................................................................................................................8
3.3 Control Panel..................................................................................................................................9
3.4 TIG Torch Controls........................................................................................................................10
3.5 Symbols chart...............................................................................................................................11
4CONTROLS EXPLAINED..........................................................................................................................12
4.1 Weld Process Selection ................................................................................................................12
4.1.1 MMA ........................................................................................................................................12
4.1.2 TIG HF.......................................................................................................................................12
4.1.3 TIG LIFT.....................................................................................................................................12
4.2 Output Current Mode Selection...................................................................................................13
4.2.1 DC (Direct Current)...................................................................................................................13
4.2.2 AC (Alternating Current) ..........................................................................................................13
4.3 Function Selection........................................................................................................................14
4.3.1 ON (Standard Pulse).................................................................................................................14
4.3.2 EASY (Easy Pulse Function).......................................................................................................14
4.3.1 BiLEVEL (Bi-Level Current Function).........................................................................................14
4.4 Trigger Mode Selection ................................................................................................................15
4.4.1 2t (Standard Trigger) ................................................................................................................15
4.4.2 4t (Latch Trigger) ......................................................................................................................15
4.4.1 SPOT (Spot Weld Function)......................................................................................................15
4.5 TIG Arc Parameters/Characteristics Settings................................................................................16
4.5.1 Pre-Gas Time (7a).....................................................................................................................16
4.5.2 Start Amps (7b) ........................................................................................................................16
4.5.3 Slope Up (7c)............................................................................................................................16
4.5.4 Main Amps (7d)........................................................................................................................16
4.5.5 Base Amps (7e).........................................................................................................................17
4.5.6 Frequency (7f)..........................................................................................................................17
4.5.1 Balance (7g)..............................................................................................................................17
4.5.1 Spot Time (7h)..........................................................................................................................18
4.5.2 Slope Down (7k).......................................................................................................................18
4.5.3 Finish Amps (7l)........................................................................................................................18
4.5.4 Post-Gas Time (7m)..................................................................................................................18

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4© Weldclass 2020 | E.&O.E.
4.5.1 SmartStart AC (7n) ...................................................................................................................18
4.6 Remote Controls...........................................................................................................................19
4.6.1 Remote Control TIG Torch........................................................................................................19
4.6.1 Remote Foot Control (Optional Accessory)..............................................................................19
4.7 MMA/Stick Arc Parameters/Characteristics Settings...................................................................20
4.7.1 Hot Start (7b) ...........................................................................................................................20
4.7.2 Current / Amps (7d) .................................................................................................................20
4.7.3 Arc Force Adjustment (7e) .......................................................................................................20
4.8 VRD Function (MMA / Stick) .......................................................................................................21
4.9 LCD Multi-Function Display..........................................................................................................21
4.10 Error/Over Temperature Indicator Light ......................................................................................21
5POWER SUPPLY .....................................................................................................................................22
5.1 Electrical Connection....................................................................................................................22
5.2 Extension Leads............................................................................................................................22
5.3 Generator Use..............................................................................................................................23
5.3.1 Generator Size..........................................................................................................................23
5.3.2 Generator Quality & Warranty Limitations..............................................................................23
5.3.3 3 Golden Rules of Generator use.............................................................................................23
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
8.5 Torch Control 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

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 5
11 STICK (MMA) BASIC WELDING GUIDE ..............................................................................................35
11.1 Size of Electrodes .........................................................................................................................35
11.2 Storage of Electrodes ...................................................................................................................35
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
12.3.4 AC Balance ...........................................................................................................................51

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6© Weldclass 2020 | E.&O.E.
12.4 Finishing the Weld........................................................................................................................52
12.4.1 Down-Slope..........................................................................................................................52
12.4.2 Post Gas Flow.......................................................................................................................52
12.4.3 Finish Amps..........................................................................................................................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.....................................................................................................................56
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....................................................................................................57
14.4.5 Electricity Can Kill.................................................................................................................58
14.4.6 Fumes And Gases.................................................................................................................59
14.4.7 Fire & Explosive Risks...........................................................................................................59
14.4.8 Sparks & Hot Metal..............................................................................................................60
14.4.9 Gas Cylinders........................................................................................................................60
15 WARRANTY.......................................................................................................................................60
15.1 Warranty Information ..................................................................................................................60

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 7
2SPECIFICATIONS
Description
WeldForce 202T AC/DC
Part Number
WC-202T
Dimensions
L430 x W170 x H340mm (including handle)
Weight of Power Source
16.35kg
Standard
AS 60974.1
Power Supply
240V +/- 15% 50hz Single Phase
Factory Fitted Plug Rating
10A
Open Circuit Voltage U0
VRD On = 15V / VRD Off = 95A
TIG Tungsten Size
1.6 – 2.4mm
MMA Electrode Size
1.6 – 4.0mm
Protection Class
IP23
TIG (GTAW) Welding
15A Power Supply**
10A Power Supply*
Welding Current Output
5 – 200A
5 – 180A
Duty Cycle
200A / 18.0V @ 24%
115A / 14.6V @ 60%
100A / 14.0V @ 100%
180A / 17.2V @ 19%*
115A / 14.6V @ 60%
100A / 14.0V @ 100%
Effective Input Current
14A
10A*
Maximum Input Current
33A
30A
DC Stick (MMA) Welding
20A Power Supply***
15A Power Supply**
10A Power Supply*
Welding Current Output
5 – 160A
5 – 160A
5 – 150A
Duty Cycle
160A / 26.4V @ 30%
110A / 24.4V @ 60%
95A / 23.8V @ 100%
160A / 26.4V @ 20%**
100A / 24.4V @ 60%**
80A / 23.2V @ 100%**
150A / 26.0V @ 12%*
75A / 23.0V @ 60%*
60A / 22.4V @ 100%*
*Effective Input Current
I1eff 18A
I1eff 15A
I1eff 10A
Maximum Input Current
I1max 33A
I1max 33A
I1max 30A
Table 1
*This machine is factory fitted with 10A plug for commissioning purposes only. Whilst 10A plug is fitted,
the operator must set to 10A (CL.2) mode and ensure that output and duty cycle limits indicated above are
not exceeded.
**If using on 15A power supply, 15A plug should be installed by a qualified person (such as a licensed
electrician) – and if using in MMA (stick) welding mode, the operator must ensure that output and duty
cycle limits indicated above are not exceeded.
***If using on 20A power supply (to allow full output in MMA mode), 20A plug should be installed by a
qualified person (such as a licensed electrician).
For full machine specifications, refer to technical data plate on base of machine.

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8© Weldclass 2020 | E.&O.E.
3KNOW YOUR MACHINE
3.1 Machine Rear
1. Mains Power Switch
2. 240V AC Mains Power Input Lead
3. Gas Inlet Connection
4. Fuse
5. Water Cooler Interface
6. Remote Control Interface
3.2 Machine Front
1. Positive Dinse Socket
2. Negative Dinse Socket
3. TIG torch Interface Connector
4. TIG Torch Gas Connector
Figure 2
Figure 1

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 9
3.3 Control Panel
5. Control Panel
6. Welding Mode Selection Buttons
a. Pulse Selection Button (Pulse/Easy Pulse/Bi-Level)
b. Trigger Mode Selection Button (2T/4T/Spot)
c. Process Selection Button (HF TIG/Lift-Arc TIG/MMA)
d. Current Selection Button (AC/DC)
7. Welding Parameter Indicator Lights
a. Pre-Gas (TIG) / VRD (MMA) Indicator Light ( [sec])
b. Start Amps (TIG) / Hot Start (MMA) Indicator Light (ISTART)
c. Slope-Up Setting Indicator Light (tSTART)
d. Main Amps Indicator Light (I2)
e. Base Amps (TIG) / Arc Force (MMA) Indicator Light (I1[A])
f. Frequency Indicator Light ( )
g. Balance Indicator Light ( )
h. Spot Time Indicator Light ( )
k. Slope-Down Indicator Light (tEND)
l. Finish Amps Indicator Light (Ie[A])
m. Post-Gas Indicator Light ( [sec])
n. SmartStart AC ( [A-sec])
8. Remote Control Indicator Light
9. Selection Knob
10. LCD Readout
11. Input Power Indicator Light
12. Error/Over Temperature Indicator Light
Figure 3

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10 © Weldclass 2020 | E.&O.E.
3.4 TIG Torch Controls
1. Torch Trigger Button
2. Remote Control Amperage Potentiometer
Figure 4
21

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 11
3.5 Symbols chart
I
Power On
O
Power Off
Power On
Indication
ꝇ
Fault Indication
Remote Control
Caution / Hazard
Read Instruction
Manual
Spot Weld Function
Pulse Function
Alternating Output
Current (AC)
Bi-Level Trigger
Smart Start AC
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 Input
Current (AC)
Direct Output
Current (DC)
–
Negative
+
Positive
Hertz (cycles/sec)
Duty Cycle
Amperage
(Current)
Voltage
Table 2

4CONTROLS EXPLAINED
4.1 Weld Process Selection
1. Press ‘Current Selection Button’ until the desired Indicator Light is lit.
Figure 5
4.1.1 MMA
Stick/MMA welding
4.1.2 TIG HF
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 TIG LIFT
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

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 13
4.2 Output Current Mode Selection
1. Press Current Selection Button until the desired Welding Process Indicator Light is lit.
Figure 6
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.
See 12.3.2 for more information.

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14 © Weldclass 2020 | E.&O.E.
4.3 Function Selection
1. Press Pulse Selection Button until the desired Indicator Light is lit. If no indicator is lit then the
machine is in Standard Non-Pulse mode.
NOTE: Functions are only available in TIG modes.
Figure 7
4.3.1 ON (Standard Pulse)
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 base current should be
sufficient to maintain the existing molten weld pool, while the main 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.
4.3.2 EASY (Easy Pulse Function)
This is the same as Standard Pulse, however the advanced arc settings are automatically set based on
(or in proportion to) the main current setting. This makes it much simpler for inexperienced TIG welders
to set up and weld with pulse.
These settings are;
Base Current/Amps I1[A] = 70% of Main Current/Amps I2[A]
Pulse Frequency = 4 Hz
Balance = 50%
These settings can be adjusted/changed if required, however they will revert to the pre-set values
if/when the Pulse mode is changed and/or the machine is re-started.
4.3.1 BiLEVEL (Bi-Level Current Function)
Bi-Level Function is a non-pulse function that enables the operator to swap between 2 current levels (I1
& I2) whilst welding using the torch trigger. 4t Trigger Mode must be selected to enable Bi-Level
selection. During welding a quick press of the trigger will toggle between I1 current setting and I2 current
setting.

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 15
4.4 Trigger Mode Selection
1. Press Trigger Mode Selection Button until the desired indicator light is lit.
NOTE: Trigger mode selection only applies to TIG welding.
Figure 8
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.
This function is useful for longer welds as the trigger is not required to be held on continuously and thus
reduced operator fatigue. It also enables utilization of various advanced arc functions.
With Bi-Level Off: When the trigger button is pressed initially it will ignite the arc with an amperage
level as per ISTART Start Current setting. When the trigger is released the amperage will begin Slope-Up
(as per Slope-Up ts[sec] setting) up to Main Current (I2) amperage level. When trigger is pressed again
the amperage will begin Slope-Down (as per Slope-Down te[sec] setting) to Finish Current (Ie) amperage
level. When trigger is finally released again the arc will stop.
With Bi-Level On: When the trigger button is pressed initially it will ignite the arc with an amperage
level as per ISTART Start Current setting. When the trigger is released the amperage will begin Slope-Up
(as per Slope-Up ts[sec] setting) up to Main Current (I2) amperage level. Pressing the trigger and
releasing quickly will toggle the amperage output between Main Current (I2) amperage level and Base
Current (I1) amperage level. When trigger is pressed and held down again the amperage will begin Slope-
Down (as per Slope-Down te[sec] setting) to Finish Current (Ie) amperage level. When trigger is finally
released again the arc will stop.
4.4.1 SPOT (Spot Weld Function)
Spot Weld Time setting is adjustable from 0 – 10 seconds. This controls the length of time for the weld.
When the trigger button is pressed and held down 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.

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16 © Weldclass 2020 | E.&O.E.
4.5 TIG Arc Parameters/Characteristics Settings
NOTE: The following parameter settings are only available in TIG welding modes.
Figure 9
1. Keep Pressing ‘Selection knob’ (9) down until the desired Arc Parameter Setting Indicator Light is
lit.
2. Rotate the ‘Selection knob’ (9) to adjust the Setting for this Parameter Setting.
4.5.1 Pre-Gas Time (7a)
Pre-Gas (or Pre-Flow) setting is adjustable from 0 – 10 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 Amps (7b)
Start Amps (or Start Current or Initial Current or ISTART) sets the welding current activated at the
beginning of the weld. Adjustable 5-200A.
In 2t & SPOT Trigger Modes: This amperage setting is maintained for a fixed time after the torch trigger
is pressed at the beginning of the weld.
In 4t Modes: This amperage setting is maintained while the torch trigger is pressed down at the
beginning of the weld. Once the trigger is released the Slope Up function will begin.
4.5.3 Slope Up (7c)
Slope Up (or Up Slope or Initial Slope or tSTART) time setting is adjustable from 0 – 10 seconds. This is the
time taken for the amperage to ramp up from Start Amps to Main Amps.
4.5.4 Main Amps (7d)
Main Amps (or Main Current or I2) is the main welding current. In Pulse and Bi-Level modes it represents
the Maximum current. Adjustable 5-200A.

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 17
4.5.5 Base Amps (7e)
Base Amps (or Base Current or Trough Current or I1) is only available in Pulse or Bi-Level modes.
In Pulse & Easy Pulse mode: This is the lower amperage of the pulse wave, adjustable 1 - 100A.
See 12.3.3 for more information.
In Bi-Level mode: This is the second current setting that can be toggled to during welding, adjustable 5-
198A
4.5.6 Frequency (7f)
In Pulse & Easy Pulse mode: Frequency (Hz) sets the pulse frequency (the rate that the welding output
alternates between the Main and Base Amp settings). Setting is measured in number of cycles per
second (Hertz). Adjustable 1 - 99 Hz.
See 12.3.3 for more information.
In AC with Pulse Off: Frequency (Hz) sets the frequency of the AC welding current (the rate that the
welding output alternates between forward and reverse current flow). Setting is measured in number
of cycles per second (Hertz). Adjustable 10 - 200 Hz.
4.5.1 Balance (7g)
In Pulse & Easy Pulse mode: Adjusts the ratio (1-99%) between the time during which the current is at
its highest level (main welding current) and the total pulse cycle period/time. This adjustment is often
referred to as Pulse Width. See 12.3.3 for more information.
In AC with Pulse Off: Adjusts the balance (-80 to +80%) 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 (positive settings) 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 (negative settings) 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 12.3.4 for more information.
Setting Value
Weld
Wave
Effects
Positive
More cleaning effect
Less penetration
O (zero)
Neutral
Negative
Less cleaning effect
More penetration

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18 © Weldclass 2020 | E.&O.E.
4.5.1 Spot Time (7h)
This only applies when set to Spot Trigger mode. This Spot Timer setting is the time adjustment for the
welding duration and is adjustable from 0.01 – 10 seconds.
4.5.2 Slope Down (7k)
Slope-Down (or Down Slope or Final Slope or Ramp Down or tEND) time setting is adjustable from 0 – 10
seconds. This is the time taken for the amperage to ramp down from Main Amps to End Amps. This
allows the operator to complete the weld without leaving a ‘crater’ at the end of the weld pool. See
12.4.1 for more information.
4.5.3 Finish Amps (7l)
Finish Amps (or Finish Current or End Current or Ie[A]) sets the welding current at the end of the weld.
In 2t Mode: This is the final setting (adjustable 5-9A) that the welding current will ramp down to after
the torch trigger is released at the end of the weld. This is only applied if the Slope Down setting is
greater than 0.
In 4t Mode: This amperage setting (adjustable 5-9A) is maintained while the torch trigger is held down
at the end of the weld. Once the trigger is released welding arc will stop.
4.5.4 Post-Gas Time (7m)
Post Gas (or Post Flow) 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. Adjustable 0 – 10 seconds.
4.5.1 SmartStart AC (7n)
SmartStart AC is a unique setting which can be adjusted to make weld starting easier when welding with
AC current.
When welding aluminium, the material being welded and also the Tungsten electrode will have an oxide
layer on them which acts as an insulator & presents an obstacle to igniting the welding arc.
SmartStart AC delivers a specific amount of positive current at a specific energy level for a specific period
of time. This has the results of delivering very smooth and reliable AC arc ignition, every weld!
The setting is measured in as an ‘energy’ level (not time). Refer to the below chart for the recommended
setting ranges for different Electrode sizes. The setting may also very depending on the Tungsten
Electrode type used and specific applications.
The machine will ‘beep’ and flash up the Electrode diameter as the operator adjusts through the settings
ranges to make it easier to set within recommended ranges.
Electrode
Diameter
Recommended Setting Range
From
To
1.0mm
3.2
3.8
1.6mm
8.2
9.2
2.4mm
18.8
19.8
3.2mm
32.8
34.8

Weldforce 202T AC/DC
© Weldclass 2020 | E.&O.E. 19
4.6 Remote Controls
4.6.1 Remote Control TIG Torch
The TIG torch supplied with the Weldforce 202T AC/DC machine incorporates a Remote Control
Amperage Potentiometer on the handle. This can be used to change the Main Amps either before or
during welding.
4.6.1 Remote Foot Control (Optional Accessory)
An optional Foot control is available for use with the Weldforce 202T AC/DC machine
(part no. WC-06370).
This enables the main current to be regulated by foot to allow the operator to change the amperage
whilst welding without compromising control of the torch.
Figure 10

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4.7 MMA/Stick Arc Parameters/Characteristics Settings
NOTE: The following parameter settings are only available in MMA/Stick welding mode.
Figure 11
1. Keep Pressing ‘Selection knob’ (9) down until the desired Arc Parameter Setting Indicator Light is
lit.
2. Rotate the ‘Selection knob’ (9) to adjust the Setting for this Parameter Setting.
4.7.1 Hot Start (7b)
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.
4.7.2 Current / Amps (7d)
This is the main welding current.
4.7.3 Arc Force Adjustment (7e)
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.