Draper Expert 70052 User manual

HIGH FREQUENCY
200A TIG/MMA
ALUMINIUM WELDER
70052
These instructions accompanying the product are the original instructions. This document is part of the product,
keep it for the life of the product passing it on to any subsequent holder of the product. Read all these instructions
before assembling, operating or maintaining this product.
This manual has been compiled by Draper Tools describing the purpose for which the product has been designed,
and contains all the necessary information to ensure its correct and safe use. By following all the general safety
instructions contained in this manual, it will ensure both product and operator safety, together with longer life of the
product itself.
All photographs and drawings in this manual are supplied by Draper Tools to help illustrate the operation of the
product.
Whilst every effort has been made to ensure the accuracy of information contained in this manual, the Draper
Tools policy of continuous improvement determines the right to make modifications without prior warning.


1. INTRODUCTION
1.1 SCOPE
High frequency TIG/MMA aluminium welder containing
the latest integrated digital technology for optimum
performance.
This product is intended for trade use with the quality &
features to meet and exceed the expectations of the
most demanding user. Any application other than that it
was intended for, is considered misuse.
This product is not a toy and must not be used by
children or any person with reduced physical, sensory or
mental capabilities or lack of experience and knowledge,
or people unfamiliar with these instructions.
Local regulations may restrict the age of the operator.
1.2 UNDERSTANDING THIS MANUALS
SAFETY CONTENT:
Warning! – Information that draws attention to the
risk of injury or death.
Caution! – Information that draws attention to the risk of
damage to the product or surroundings.
1.3 EXPLANATION OF SYMBOLS
Warning!
Read the instruction manual.
Warning!
Wear suitable welding eye/face protection.
Warning!
Wear ear defenders (During grinding
operations).
Warning!
Wear protective gloves.
Keep out of the reach of children.
Warning!
Danger of electric shock.
Danger of fire.
Danger of explosion.
Danger of fumes.
Danger of ultraviolet radiation.
Danger of burning splashes.
Fan cooled.
Duty cycle.
Input voltage.
Protection rating.
Thermal overload.
One pound-force applied to an area of one
square inch.
Range.
Net machine weight.
WEEE –
Waste Electrical & Electronic Equipment.
Do not dispose of Waste Electrical & Electronic
Equipment in with domestic rubbish.
Do not incinerate or throw
onto fire.
For indoor use only.
Do not expose to rain.
Class 1 appliance
(Must be earthed).
UK Conformity Assessed.
European conformity.
See page 6.
– 2 –

– 3 –
2. SPECIFICATION
2.1 SPECIFICATION
Stock No. .............................................................. 70052
Part No. ............................................................ TW250A
Rated voltage .................................................. 230~50Hz
Input current ............................................................ 200A
Current range .................................................. 10 – 200A
Electrode size...............................................1.6 – 5.0mm
Pulse frequency...............................................01. – 20Hz
Degree of protection.............................................. IP21S
Cooling ............................................................... Air (fan)
Insulation class.............................................................. F
Duty cycle........................... 20% at 200A, 100% at 155A
Dimensions ......................................557 × 210 × 395mm
Weight (Gross/Net/machine only) ............... 27/25.5/18kg
3. HEALTH AND SAFETY
INFORMATION
3.1 GENERAL SAFETY
INSTRUCTIONS
Warning! Read all safety warnings and all
instructions. When using electric tools basic safety
precautions should always be followed to reduce the risk
of fire, electric shock, and personal injury including the
following.
Read all these instructions before attempting to
operate this product and save these instructions.
Electric shock can kill:
– Remove the plug from the socket before carrying out
adjustment, servicing, or maintenance.
– Allow 5 minutes waiting time for the capacitors to
discharge before removing the panels for any
maintenance operations.
– Do not touch live electrical parts.
– Never use electrode holders or cables with damaged
or deteriorated insulation.
– Keep the working environment, equipment, cables,
and clothing free from grease, oil, moisture, and dirt.
– Ensure the welding machine has been correctly
earthed and all panels are fitted securely.
– The operator must be insulated from the floor and
workbench using a dry insulation mat.
– Wear isolating footwear and gloves that are in good
condition, i.e. without holes.
– In hazardous conditions of increased electric shock
always ensure a second person is present in case of
an accident.
– Never change electrodes with bare hands or damp
gloves (for ARC/MMA welders).
– Keep welding cables away from power cables.
– Regularly inspect the condition of the welding, earth,
and power cables for signs of damage.
– Do not leave the machine unattended and remove
the plug from the socket when not in use.
– Do not use welding cables unsuitable for the
amperage.
– Ensure the earth clamp is adjacent to the weld seam,
secured to bare metal and when not in use is
insulated for safety.
– Keep all equipment well maintained.
– The operator shall prevent gas cylinders in the
vicinity of the workpiece from becoming part of the
welding circuit.
Fumes & Gases can be harmful:
– The welding process generates hazardous fumes as
a by-product. Inhalation of these fumes is hazardous
to health.
– Keep your head away from the weld to avoid
breathing the fumes.
– If welding in confined spaces ensure adequate
ventilation and use a fume extractor.
– Welding fumes displace oxygen. The danger of
suffocation.
– By-products of welding can react with other chemical
vapours to produce a toxic/explosive environment.
Welding can cause fire or explosion:
– Arc welding and allied processes can cause fire and
explosions and precautions shall be taken to prevent
these hazards.
– Before starting a weld ensure the area is clear of
flammable materials.
– Remove any inflammables to a safe distance,
especially substances likely to generate a dangerous
vapour.
– The welding arc can cause serious burns. Avoid
contact with skin.
– Sparks and molten metal are cast out during
welding. Take precautions to prevent fire igniting and
wear protective clothing.
– Sparks and molten metal can pass through gaps. Be
aware that fire can start out of sight. Flammables in a
locked cabinet may not be safe.
– Do not weld pressurised containers.
– Do not weld tanks, drums, or other vessels until they
have been correctly cleaned/prepared for welding.
– Always have appropriate and fully maintained
fire-fighting equipment suitable for the materials used
and for use in electrical environments available in
close proximity at all times.
– Keep clothing free from oil and grease.
– Wear a hat, flame-proof apron, woollen clothing,
gloves, long sleeve tops with closed neck, trousers
(without turn-ups) to cover non-slip boots.

– 4 –
– Protective head and shoulder coverings should be
worn when overhead welding.
– Avoid taking any fuels with you e.g. cigarette lighters
or matches.
– Hot spots and their immediate surroundings should
be observed until their temperature has dropped to
normal.
Personal Protection:
– The body should be protected by suitable clothing.
– The use of neck protection may be necessary
against reflected radiation.
– Wear safety glasses when chipping, wire brushing,
grinding, or when near cooling welds as metal filings
or slag can be thrown up. Fully enclosed goggles are
advisable.
– Arc machines generate a magnetic field which is
detrimental to pacemaker recipients. Consult your
doctor before going near welding equipment/
operations.
– The UV and IR radiation generated by welding is
highly damaging to the eye, causing burns. This can
also affect the skin. Protect the eyes and face.
– The face and eyes shall be protected by suitable
welding shields equipped with appropriate ocular
protection filters.
– Where environments are subject to pedestrians and
traffic ensure a protective screen is used to avoid
accidental arc glare.
– Do not weld in the vicinity of children or animals and
ensure no one is looking before striking up.
– In the welding environment, damaging levels of noise
can exist. Wear hearing protection if the process
dictates.
– Do not touch hot equipment or metal. Allow the weld
time to cool, use the correct tool and wear protective
welding gauntlets.
– Wear flame retardant clothing (leather, wool, etc.).
– Take care when adjusting or maintaining the torch
that it has had time to cool sufficiently and is
disconnected.
– The arc generates
• ultra-violet radiation (can damage skin and eyes);
• visible light (can dazzle eyes and impair vision);
• infra-red (heat) radiation (can damage skin and
eyes);
– Such radiation can be direct or reflected from
surfaces such as bright metals and light coloured
objects.
Gas cylinders:
– Gas cylinders should be located or secured so that
they cannot be knocked over.
– Shield gas containers can explode if damaged. Take
care when handling.
– Ensure gas cylinders are shut-off when not in use
and between operations.
– Take care that no build-up of gas is permitted to form
in confined areas.
– Cylinders must be in an upright position at all times
during use and storage.
– The gas cylinder must never come in contact with
the electrode.
– Follow the manufacturer’s instructions for handling,
storing, and using the gas bottle correctly and safely.
– Use the correct equipment to connect the gas bottle
to the welding torch.
Limitations:
– Do not use for:
• operations in severe conditions (e.g. extreme
climates, freezer applications, strong magnetic
fields, etc.);
• operations subject to special rules (e.g.
potentially explosive atmospheres, mines, etc);
• operations that require ingress protection greater
than IPX0, e.g. in rain or snow, etc;
General:
– Training should be sought out in
• the safe use of this equipment;
• the processes;
• the emergency procedures;
– Welding power sources are not to be used for pipe
thawing.
– Take precautions against toppling over, if the power
source shall be placed on a tilted plane.
– All equipment should be kept in good working
condition, inspected and, when defective, promptly
repaired or withdrawn from service – All equipment
should be placed so that it does not present a
hazard in passageways, on ladders, or stairways,
and should be operated in accordance with the
manufacturer’s instructions.
– In the vicinity of an arc, non-reflective curtains or
screens shall be used to isolate persons from the arc
radiation. A warning, e.g. a symbol for eye
protection, should refer to the hazard of arc
radiation.

(16)
(17)
(1) MMA electrode connection.
(2) 2 Pin TIG torch trigger/foot
pedal connection.
(3) 6 Pin foot pedal control
connection.
(4) TIG torch connection.
(5) Earth clamp connection.
(6) Carry handle.
(7) TIG torch.
(8) Earth clamp.
(9) MMA Electrode holder.
(10) Foot pedal.
(11) Control panel (see page 8 for
technical overview).
(12) 2nd Earthing point.
(13) Gas input.
(14) Power supply cable.
(15) ON/OFF switch.
(16) Brush/hammer.
(17) Face mask.
– 5 –
4. UNPACKING AND
CHECKING
4.1 PACKAGING
Carefully remove the product from the packaging and
examine it for any sign of damage. Check contents
against the parts shown in Fig A. If any part is damaged
or missing, please contact the Draper Help Line (see
back page). Do not attempt to use the product!
The packaging material should be retained during the
warranty period, in case the product needs to be
returned for repair.
Warning!
• Some of the packaging materials may be harmful to
children. Do not leave any of these materials in
reach of children.
• If any of the packaging is to be thrown away, make
sure they are disposed of correctly, according to local
regulations.
5. TECHNICAL DESCRIPTION
5.1 PRODUCT IDENTIFICATION – FIG.A
FIG.A
Note: For details of our full range of accessories and consumables, please visit drapertools.com
TIG WELD
200A AC/DC
STANDARD
Pre-flow
Arc Start
Current
Hot Start
Peak Current Duty Ratio
Pulse
Frequency
Base Current
Spot Welding Clear Depth
AC Frequency
Clear Width
Slope-down
Arc-ending
Current
Post-gas
ARC-ENDING
REPEAT
SPOT WELDING
PULSE
FAULT
COMPOSITE
PULSE
OUTPUT WAVE
DC
AC
MMA
TIG
A
%
S
Hz
GAS
CHECK
SAVE LOAD
(1)
(11)
(7)
(6)
(9)
(14)
(15)
(12)
(13)
(2)(3)(4) (5)
(8) (10)

– 6 –
5.2 DTi – DIGITAL TECHNOLOGY INSIDE
Draper Tool’s newest models of welding machines
contain the latest digital technology, integrated into every
element of the machine’s control, improving every
aspect of performance.
More Functions
Internal micro-processors combined with digital circuitry
allow more functions to be managed within a single
machine, resulting in highly sophisticated machines
which are compact and lightweight.
Superior Performance
Digital signal stabilisation maintains the machine settings
for optimum performance during use, automatically
adjusting to humidity, temperature and other
environmental factors to ensure superior welding
performance in any conditions.
Precision Control
Digital technology enables various machine settings to
be applied with a high level of accuracy, giving the user
precision control of every element of their welding.
6. ASSEMBLING THE WELDER
6.1 GENERAL
The excessive weight of this product means it should be
handled by two persons. It contains dedicated circuitry
and must be handled with care.
6.2 LOCATION
Locate the machine close to the correct power supply
and allow a 500mm air gap around to ensure sufficient
ventilation. There is a cooling fan located at the rear of
the machine housing which must be kept clear. Equally,
ensure no debris can be drawn into the machine.
6.3 CONNECTION TO THE POWER
SUPPLY
Make sure the power supply information on the product’s
rating plate is compatible with the power supply you
intend to connect it to.
A suitable plug must be fitted by a qualified
electrician.
This product’s wiring has insulation stripped in
preparation for wiring a 32A plug (not supplied).
It is designed for connection to a 32 amp power supply
rated at 230V AC.
Because it is constructed mostly of metal parts, it is a
Class 1 machine; meaning, it must have an earth
connection in the power supply. This is to prevent
electrocution in the event of a failure.
Note: Remove the plug from the socket before carrying
out adjustment, servicing or maintenance.
Check that the electrical supply delivers the voltage and
frequency corresponding to the product and that it is
fitted with a delayed fuse suited to the maximum
delivered rated current.
Note: This product has been set to the highest voltage
at the factory.
6.4 RATING PLATE
IP21S
Unit’s
protection class
rating.
Constant
current.
MMA welder.
Alternating
Current (AC)
delivery.
TIG welder.
Do not
dispose of
WEEE* as
unsorted
municipal
waste.
Semiconductor
diode rectifier.
†
UK Conformity
Assessed.
1~50/60Hz
Power supply
identifier, e.g.
socket with 3
poles.
European
conformity.
Direct Current
(DC) delivery.
†
Secondary
no-load
voltage.
f1f2
Inverter
frequency
conversion
stage.
†
U
1
=230V
Rated supply
voltage.
Transformer.
†
X
Rated duty
cycle.

– 7 –
Fan cooled.
I
2
Welding
current
(AMPS)
Indoor use
only. Do not
expose to rain.
U
2
Welding
current
(VOLTS)
Class F
Insulation
rating.
Unit’s
maximum
absorbed
current
(AMPS).
†
Symbols can be combined,
for example:
f
1
f
2
1~
Single Phase D.C MMA
Welder.
Unit’s effective
absorbed
current (AMPS).
European
reference safety
standard.
* Waste Electrical & Electronic Equipment
7. SETTING THE WELDER
Make certain the location does not pose any hazards as
detailed in the safety instructions, before attempting to
start the machine.
Note: Refer to the rating label for energy input details.
Note: For TIG operations, ensure the gas bottle is
securely mounted and in a vertical position according to
the manufacturer’s instructions.
Warning! Remove the plug from the socket before
carrying out adjustment, servicing or maintenance.
7.1 TUNGSTEN ELECTRODES –
SELECTION & PREPARATION –
FIGS.1 – 4
The correct selection of tungsten size and type will vary
for each application dependent upon amperage,
material thickness, equipment and shield gas, however
as a general rule for DC output negative electrode
machines a 1.6mm thorium oxide tungsten electrode will
suffice.
Tungsten Ø Amp Range
≤1.2mm ≤70A
1.6mm 70 - 140A
2.4mm 140 - 250A
3.2mm ≥240A
The selection of the ceramic shroud is based on the
tungsten electrode and should be 4 to 6 times the
tungstens diameter. For example a 1.6mm tungsten
could be used with a No.4 (6.4mm) ceramic shroud, a
No.5 (8.0mm) or at the maximum a No.6 (9.8mm).
There are a variety of different tungsten electrodes
available with the most common categories, shown in
the table below and on page 8.
Before welding can commence the electrode must be
prepared, i.e. the tip ground to a suitable point.
For DC welding the tip should be ground into a point to
help produce a stable arc. If using a grinding wheel, a
dedicated abrasive wheel must be used to prevent
contamination of the tungsten. The tip must be ground
straight, i.e. perpendicular to the grinder’s drive spindle.
1
FIG.
Colour code Band Content Composition Comments
Green 99% Pure Tungsten Predominantly AC providing a stable arc. Typically
used for Aluminium welding.
Brown 0.3-0.5% Zirconium Oxide Predominantly AC with a high contamination
resistance.
White 0.7-0.9% Zirconium Oxide

– 8 –
The general rule is to grind the point’s length to match
the electrodes diameter (Fig.2).
2
FIG.
However for low amperage/smaller diameter electrodes
the points length should be double the electrodes
diameter (Fig.3).
3
FIG.
Note: During the grinding process thorium alloy
tungsten can release alpha (α) dust particles and in
some instances beta (β) and gamma (γ) particles. Avoid
inhalation as they act as a carcinogen.
4
FIG.
In addition to dust protection, safety goggles must be
warn to protect eyes from sparks and debris thrown up
by the grinder.
Selection of the appropriate specification electrode is
important to achieve a good quality weld. Seek guidance
if unsure of selection.
Note: When the output is AC the tip should be rounded.
7.2 TIG (TUNGSTEN INERT GAS)
SETUP – FIGS. 5 – 6
A suitable gas supply hose, fittings and pressure regulator
will be required to connect the hose to the TIG torch.
− To attach the TIG torch (7) to the front panel
coupling marked ‘GAS’ (4), plug in and twist to lock.
− Attach the earth clamp (8) into the coupling marked
‘’ (5) – plug in and twist to lock.
− To connect the torch trigger cable (7.1), fit the 2 pin
plug into the corresponding connection port marked
‘’ (2).
− Secure the outer ring by screwing it onto the
threaded outside part of the trigger connection port.
Caution: For shield gas always use Argon/Argon CO2 mix.
Yellow 0.9-1.2% Thorium Oxide
Long life DC welding tungsten alloy providing
improved ignition properties and a stable arc. See
HSE guidelines.
Red 1.8-2.2% Thorium Oxide
Lilac 2.8-3.2% Thorium Oxide
Orange 3.8-4.2% Thorium Oxide
Black 0.9-1.2% Lanthanum Oxide
Capable of AC/DC welding with similar properties
to Thorium. A radioactive free alternative to
thoriated tungsten.
Gold 1.2-1.8% Lanthanum Oxide
Blue 1.8-2.2% Lanthanum Oxide
Pink 0.8-1.2% Cerium Oxide Capable of AC/DC welding withreduced slag
deposits.
Grey 1.8-2.2% Cerium Oxide
Note: The alloy content shown are a guide but generally range between 1% to 4%.

– 9 –
Argon
Gas
5
FIG.
6
FIG.
7.3 TIG WELDING FOOT PEDAL
CURRENT CONTROL – FIG.7
The foot pedal (10) allows the welding current to be
adjusted remotely from the main welding unit.
To connect the foot pedal:
− Plug both the 6 pin (3.1) and 2 pin (2.1) connector
plugs of the foot pedal into the corresponding ports
(3) / (2) located on the machine (the 2 pin plug
connector of the TIG torch (7.1) becomes redundant
and can be left hanging loose).
Operation:
− Set the dial (10.1) located on the side of the pedal to
the desired current output.
− Depress the foot pedal to activate. The resulting
pressure placed on the pedal controls the level of
current incrementally until the maximum level, set by
the dial is reached.
7
FIG.
7.4 MMA (MANUAL METAL ARC)
SETUP – FIG.8
− To attach the electrode holder (9) to the front panel,
insert the plug into the connection port marked ‘ ’
(1) and twist to lock.
− Attach the earth clamp (8) into the connection port
marked ‘ ’ (5) – plug in and twist to lock.
8
FIG.
7.5 MMA/ARC WELDING FILLER ROD
(ELECTRODE) SELECTION – FIG.9
The correct selection of electrode size and type will vary
for each application dependent upon material thickness,
material type, amperage and equipment, however as a
guide the figures below provide an indication.
MMA Electrode Material
Thickness
Amp Range
≤1.6mm 1-1.5mm ≤50A
2.0mm 1.2-3mm 45 - 75A
2.5mm 2-5mm 75 - 110A
3.25mm 4-8mm 100 - 150A
(1) (2) (3) (4) (5)
(7.1)
(7)
(8)
(3.1)
(10.1)
(10)
(2.1)
(8) (9)

– 10 –
Key: Function: Description
(A) Welding function selection button It is used to select welding mode under various
functions, the standard is “without arc” function, and
the slope is “with arc” function.
(B) Parameter selection button Move the indicator light to the left for preset
parameters.
(C) Parameter selection button Move the indicator light to the right for preset
parameters.
During the MMA welding process, the arc created between
the work piece and the consumable electrode rod melts the
parent metal and the filler metal in a weld pool.
The electrode’s flux coating reacts during this process
and develops into a shield gas protecting the weld bead.
Part of this reaction leaves a trail of slag which solidifies
behind the weld pool protecting the weld as it cools.
The most common varieties of electrodes are cellulosic,
rutile and basic, the latter two being the most general
purpose.
Selection of the appropriate specification electrode is
important to achieve a good quality weld. Seek guidance
if unsure of selection. 9
FIG.
7.6 CONTROL PANEL OVERVIEW – FIG.10
10
FIG.
(M)
(A) (B) (D)(C) (E) (F) (G) (H)
(L) (K) (J) (I)

– 11 –
(D) Display Used to display the values of each parameter.
(E) Data save button Used for save welding data, which can store ten
different sets of welding data.
(F) Parameter adjusting knob Adjust parameters.
(G) Load button Retrieve the stored welding parameters
(H) Welding mode selection button Hold for three seconds in the Argon welding, then
release the convertible arc welding.
(I) Waveform selection button Square wave, sine wave and triangle wave can be
selected.
(J) AC and DC selection button DC, AC function selection.
(K) Pulse function selection Choose the pulse and compound pulse function, and
the compound pulse function can only be used in the
state of AC
(L) High voltage indicating light no-load voltage indicator light
(M) Alarm light Welding machine overheat, over current alarm light.
7.7 FUNCTION PARAMETERS
Function: Description: Adjust Range: Default value:
Pre-flow The time of gas prior to
welding
0~10 S 0.1 S
Hot start Hot start current 5~200A 100A
Arc-start current The preset starting
current is adjusted when
arc closing is controlled
5~200A 40 A
Slope up When arc closing control
is adopted, the rising time
from arc starting current
to welding current can be
adjusted
0~20 S 5 S
Spot welding The welding time in the
spot welding functional
state
0~10 S 3 S
Base current When pulse mode is
adopted, the low current
of the pulse is adjusted
5~200A 10 A
Peak current/welding
current
Adjust welding current or
pulse peak current
5~200A 150 A
Duty ratio Adjust the ratio of peak
current to pulse period
when pulse mode is
adopted
10~90 % 50 %

– 12 –
8. OPERATION
8.1 ARGON ARC WELDING
DC Argon ARC welding operation：
− Make sure all parts are connected correctly.，
− Turn on the power switch.，
− The panel indicator is on，and the fan starts to work.，
− Press (H) on the operation settings control panel.
Adjust the gas flow to the specified value according
to the process specification.，
− Press the button again to close the valve.
− Choose the welding method according to the
process requirements.，Press (H) For AC/DC
selection.
− Choose the pulse function by pressing (K).，
− Press (A) selective control mode.，
AC Argon ARC welding operation
− Make sure all parts are connected correctly.，
− Turn on the power switch.，
− The panel indicator is on，and the fan starts to work.，
− Press (H) on the operation settings control panel.
Adjust the gas flow to the specified value according
to the process specification.，
− Press the button again to close the valve.
− Choose the welding method according to the
process requirements.，Press (H) For AC/DC
selection.
− Choose the pulse and composite pulse function by
pressing (K).，
− Press (A) selective control mode.，
8.2 CLEAR WIDTH
− The cleaning width is essentially the ratio of the time
it takes to adjust the positive current of the output
current (current flowing from the workpiece to the
tungsten needle) to the negative current (current
flowing from the tungsten needle to the workpiece)
– in other words, to act in one cycle. If the positive
current decreases (increases) at a given time, the
negative current increases (decreases) accordingly，
− The positive current is mainly used for welding, while
the negative current is mainly used for cleaning the
oxide film of the workpiece.Therefore, adjusting the
cleaning width allows the welder to find the best spot
to effectively remove the oxide film without burning
the tungsten needle.，
− The setting position of cleaning width, welding effect
and electrode consumption are shown in the table
below:
Parameter (%) 10 33
Standard 50
Electrode
Consumption
Few Normal Much
Penetration Deep Normal Shallow
Clear width Narrow Normal Wide
Pulse frequency Adjust the pulse
frequency value when
pulse mode is adopted
0.1~20HZ 5HZ
Clear width Adjust the cleaning width
when using AC welding
10~90 % 30 %
Clear depth Adjust the cleaning depth
when using AC welding
-50~+50 % 0%
AC frequency Adjust the frequency of
alternating current when
welding by AC mode
20~200HZ 80HZ
Slop down Adjust the time from
welding current to arc
current when arc current
is controlled
0~10 S 5 S
Arc-ending current Adjust the preset
arc-ending current when
arc closing is controlled
5~200A 20 A
Post gas The time of delayed
stopping of gas after
welding
0~10 S 5 S

– 13 –
8.3 TIG WELDING
− Prepare the joint(s) to be welded. Select the
electrode suitable for the application and insert it into
the electrode holder as described in the
manufacturers literature.
− The tungsten should extend 3-6mm past the end of
shroud but no greater than the gas shroud diameter.
− With the earth clamp, electrode holder and gas bottle
connected, connect the machine to the power supply.
The power indicator (11) will illuminate as
confirmation. Set the amperage adjustment
appropriate to the selected electrode size.
− Secure the earth clamp to a clean sound section of
the parent metal in the vicinity to the intended weld.
With all safety equipment in place and personal
protective clothing on begin welding.
Note: Ensure the gas bottle regulator is open.
− Open the torch gas control valve.
− Lower the electrode down toward the parent metal.
When near the ‘hot start’ feature will aid start up of
the initial arc.
8.4 MMA/ARC WELDING – FIG.11
− Prepare the joint(s) to be welded.
− Insert the electrode suitable for the application into
the electrode holder (6) while pressing lever (6.1).
− With the earth clamp and electrode holder
connected, connect the machine to the power supply.
The power display will illuminate as confirmation. Set
the amperage appropriate to the selected electrode
size.
− Secure the earth clamp to a clean sound section of
the parent metal in the vicinity to the intended weld.
− With all safety equipment in place and personal
protective clothing on begin welding.
− Lower the electrode down toward the parent metal
and strike the arc.
− The position of the electrode is critical to the arc and
the end result.
− Achieving a good weld will take practice. For more
detailed information refer to a industry standard
welding publication and/or seek training on the
subject.
− Use of an anti-spatter spray – Draper stock
No.05709 – will help to achieve a cleaner finished
weld.
11
FIG.
(6)
(6.1)
8.5 DIRECTION OF WELD – FIG.12
− Strike the initial arc perpendicular to the parent metal
before moving the electrode holder in the direction of
travel 20-30° (Z,Y axis) and tilt it 20-30° (Z,X axis).
− Maintain a constant gap between the electrode tip
and the weld pool of approximately 1 – 1.5 × the
diameter of the electrode for a stable arc.
Z
-Z
-X-Y
XY
Direction
of weld
12
FIG.
8.6 DUTY CYCLE
Duty Cycle is a percentage of 10 mins, in which a
machine can operate at a rated load without overheating
and interruption from the thermal cut-out device.
Example: 150A @ 30% Duty factor:
150A welding for 3 minutes
7 minutes down time
Example: 95A @ 100% Duty factor:
95A continuous welding
To increase the operation time, reduce the amperage.
Note: The heating tests have been carried out at
ambient temperature and the duty cycle (duty factor) at
20°C has been determined by simulation.

– 14 –
8.7 THERMAL CUT-OUT – FIG.13
If welding for extended periods, the thermal cut-out will
activate and the LED indicator (M) will illuminate,
prohibiting use of the machine until sufficiently cool.
Caution! After completion of any welding task, leave the
unit connected to the power supply for a sufficient period
to allow the cooling fan to continue working.
13
FIG.
9. MAINTENANCE AND
TROUBLESHOOTING
9.1 MAINTENANCE
Warning!
If the welding machine has just been turned off, you
must not conduct any internal checks or
maintenance for at least 5 minutes after the power
distribution box switch or power switch is
disconnected so that the capacitor inside the
welding machine is completely discharged.
− It is crucial to carry out regular checks on this product
to ensure optimum performance and safe operation.
− The inspection table below offers guidance for the
checking of components for general wear and tear or
damage. Wherever necessary, clean or replace such
items.
Warning! Any live electrical parts touched may
cause fatal electric shock or serious burns.
For your own safety, turn the switch off and remove the
plug from the power supply socket when carrying out
any form of maintenance or cleaning. If in doubt, consult
Draper Tools, or an authorised service agent.
Welding power supply:
Component Check points Advisories
Front panel − Check if any
components
are
damaged or
loose.
Tighten or
replace where
necessary
Front panel − Check if the
lower quick
socket is
loose.
The lower quick
socket is a
regular item. If a
defect occurs, it
will be
necessary to
check the
inside, re-fasten
or replace
components
where
necessary.
Rear panel − Check if the
air intake of
the cooling
fan has
foreign
objects
sticking to it.
Routine − Power on,
and then
check if the
appearance
has fading or
too hot
traces.
− Check if the
cooling fan
has stable
operation
sound.
− Check if the
cooling fan
takes in air
from the air
intake, if
odour,
abnormal
vibration or
noise
(especially
during
welding)
occurs.
In-case of
defects, it is
necessary to
check the inside
of the device.
Top plate,
bottom
plate and
side panel
− When the
machine
cover is
installed
onto the
housing,
check if it is
loose.
− Check if
bolts are
loose.
In case of
defects, it is
necessary to
replace or
fasten
components,
etc., as
required.
(M)

Cables:
Component Check points Advisories
Grounding cable − Check if all earth wires (for this
device and parent metal
grounding) are in place – check
if the connections are safe and
reliable.
In order to avoid the risk of
electrocution, be sure to conduct
related checks.
Cable − Check if the cable insulation
layer is worn, has other damage
or conductive components are
exposed.
− Check if the cable suffers
abnormal exterior force.
− Check if the connection of the
cable connecting with the
parent metal is reliable and firm.
Adopt a checking routine
encompassing the conditions of the
welding site. Daily checks should
be fairly simple, whilst regular
checking intervals should be more
in-depth.
Important! In order to prevent the semiconductor and P plate from being damaged by static, please follow the
instructions below:
− Before touching the conductor of the cables and P plate inside the unit, you must remove the static in advance by
touching the housing metal position with your hand, etc,.
− In order to maintain the performance of this product over time, regular checking is advised.
− Inspect and clean the housing interior. Remove any dirt, dust or foreign matters. Use compressed air without
water (dry air) to blow accumulated detritus away.
− Regular checking intervals should generally be conducted every 6 months. However, this should be extended to
every 3 months if workplace conditions are regularly dusty or contains oily smoke and fumes.
9.2 TROUBLESHOOTING GUIDE
Faults Possible causes Solutions
The fault indicator off, no HF
discharge rustling, and arc
striking effective
− The arc striking transformer
primary cable has a poor touch
with the power plate.
− Re-tighten
− The discharging nozzle is
oxidized or is too far.
− Remove the oxidized
membrane on the surface of the
discharging nozzle, or adjust its
distance to approx. 1mm.
− The manual welding Argon
welding switch is broken. − Replace
− Some components of the HF
arc striking circuit is damaged. − Find and replace.
Large ARC splashes and very
hard burning of the alkali
welding rod
− Wrong polarity − Exchange the polarity of the
earth wire and the handle wire.
– 15 –

– 16 –
Fault indicator on and no output − Over-heat protection has
possibly been activated.
− Switch off the device and then
restart it after the fault indicator
is off.
− Wait 2-3min without switching
off the unit. The device may
then naturally restore its self
(the device of pure Argon arc
welding does not have
over-heat protection function)
− Inverter circuit could be
defective.
− Unplug the power supply plug
of the main transformer on the
MOS plate to restart the device.
The previous steps have been
taken to remedy the situation,
but the fault indicator is still on
− Switch off the device and
unplug the power supply plug of
the HF arc striking power
supply.
• If the fault indicator is still
on, it will indicate that some
field-effect tubes on the
MOS plate are broken.
− Find and replace them with
ones of the same type.
• If the fault indicator is off, it
will indicate that the voltage
rise transformer in the HF
arc striking circuit on the
power supply plate is
broken.
− Replace.
The previous steps have been
taken to remedy the situation.
The fault indicator is off, but
there is no output.
• The medium plate
transformer could be broken.
Use an electric bridge to
measure the primary
inductance and Q value of
the main transformer which
should be L=0.4-0.7Mh.
• Some the secondary
rectifying tubes of the
transformer could be
punctured.
− Replace.
− Find and replace with the ones
of the same type.

10. WARRANTY
10.1 WARRANTY
Draper tools have been carefully tested and inspected
before shipment and are guaranteed to be free from
defective materials and workmanship.
Should the tool develop a fault, please return the
complete tool to your nearest distributor or contact:
Draper Tools Limited, Chandler’s Ford, Eastleigh,
Hampshire, SO53 1YF. England.
Telephone Sales Desk: [phone] or:
Product Helpline [phone].
A proof of purchase must be provided.
If upon inspection it is found that the fault occurring is
due to defective materials or workmanship, repairs will
be carried out free of charge. This warranty period
covering labour is 12 months from the date of purchase
except where tools are hired out when the warranty
period is 90 days from the date of purchase. This
warranty does not apply to any consumable parts, any
type of battery or normal wear and tear, nor does it
cover any damage caused by misuse, careless or
unsafe handling, alterations, accidents, or repairs
attempted or made by any personnel other than the
authorised Draper warranty repair agent.
Note: If the tool is found not to be within the terms of
warranty, repairs and carriage charges will be quoted
and made accordingly.
This warranty applies in lieu of any other warranty
expressed or implied and variations of its terms are not
authorised.
Your Draper warranty is not effective unless you can
produce upon request a dated receipt or invoice to verify
your proof of purchase within the warranty period.
Please note that this warranty is an additional benefit
and does not affect your statutory rights.
Draper Tools Limited.
11. DISPOSAL
11.1 DISPOSAL
– At the end of the machine’s working life, or when it
can no longer be repaired, ensure that it is disposed
of according to national regulations.
– Contact your local authority for details of collection
schemes in your area.
In all circumstances:
• Do not dispose of power tools with
domestic waste.
• Do not incinerate.
• Do not dispose of WEEE* as unsorted
municipal waste.
* Waste Electrical & Electronic Equipment.
– 17 –