Kemppi Minarc 110 User manual

Operation instructions  english
Gebrauchsanweisung  deutsch
Gebruiksaanwijzing  nederlands
Manuel dutilisation  français
1910010E
0244

©COPYRIGHT KEMPPI OY
2 – Minarc/0244
CONTENTS
1. INTRODUCTION .............................................................................3
1.1. For the reader ...........................................................................3
1.2. Product presentation ................................................................3
1.3. Safety precautions ...................................................................3
2. BEFORE YOU START USING THE UNIT ....................................... 4
2.1. Unpacking ................................................................................ 4
2.2. Placing the unit ......................................................................... 4
2.3. Serial number ...........................................................................4
2.4. Main components of the unit ..................................................... 5
2.5. Connecting to power supply mains .......................................... 5
2.6. Filler materials and equipment ................................................ 5
3. USE .................................................................................................. 6
3.1. Welding processes ...................................................................6
3.1.1. Manual Metal arc welding ..................................................... 6
3.1.2. TIG welding ........................................................................... 6
3.2. Operating functions .................................................................. 6
3.3. Welding selections .................................................................... 6
3.3.1. Manual Metal arc welding (MMA) .......................................... 6
3.3.2. TIG welding ........................................................................... 7
3.4. Welding selections .................................................................. 7
3.4.1. Earth ...................................................................................... 7
3.4.2. Welding ................................................................................. 7
3.5. Storing ..................................................................................... 7
4. MAINTENANCE ............................................................................... 7
4.1. Daily maintenance .................................................................... 8
4.2. Ordering numbers ................................................................... 8
4.3. Troubleshooting ....................................................................... 8
5. TECHNICAL INFORMATION / GUARANTEE CLAUSES ................ 9
5.1. Technical information ............................................................... 9
5.2. Guarantee clauses .................................................................. 10

©COPYRIGHT KEMPPI OY
Minarc/0244 – 3
1. INTRODUCTION
1.1. FOR THE READER
Congratulations on having purchased a KEMPPI product. Properly installed and used
KEMPPI products should prove to be productive machines requiring only a small
amount of regular maintenance.
This manual is arranged to give you a good understanding of the equipment and its safe
use. There is also information on both servicing the unit and its technical information
in the end of the booklet. Read the instructions before taking the machine into use or
servicing it for the first time. Additional information on Kemppi products and their use
can be obtained from Kemppi or a Kemppi dealer.
Kemppi reserves the right to make changes in technical data, printed on these instruc-
tions.
In this document, where ever there exists a danger to life or injury the following symbol
is used:
Read the warnings carefully and follow the instructions. Please also study the operation
safety instructions and respect them when installing, operating and servicing the
machine.
1.2. PRODUCT PRESENTATION
Kemppi Minarc is a manual metal arc welding machine, small in size, suitable for
industry, site and repair welding. The unit uses a one phase connection voltage and it is
manufactured in two different welding power sizes 110 A and 140 A.
Minarc tolerates a great fluctuation of input voltage and there-fore is thus suitable for
work on sites using generator as well as to be used with long power cables. Inverter
technology has been used when designing the unit. Power regulation in power source
is done with IGBT transistors. Welding and earth cables are supplied with the unit.
They are equipped with suitable connections for the unit electrode holder, earth clamps
and connections.
Minarc can also be used for TIG welding. TIG arc is started by scratching. Ordering
numbers of additional equipment for TIG welding can be found in chapter 4.2. Ordering
numbers.
1.3. SAFETY PRECAUTIONS
Read the warning texts carefully and follow the instructions.
Arc and welding spatter
Arc and the reflected radiation from it can damage unprotected eyes. Shield your eyes
and protect your surroundings appropriately, before you start welding. Arc and welding
spatter will burn unprotected skin. When welding – use protective gloves and clothing.
Danger of fire and explosion
Observe the fire safety instructions. Remove flammable material near the place where
you will weld. Have necessary fire extinguishing equipment at hand when you weld.
Note dangers caused by special jobs, such as risk of fire and explosion when welding
tanks. Note! Sparks may ignite fire even hours later!
Welding is working with fire, note special instructions for such work.

©COPYRIGHT KEMPPI OY
4 – Minarc/0244
Mains voltage
Never take welding machine inside the piece you are working on (e.g. container or car).
Never set the welding machine on wet surface. Replace faulty cables immediately, they
create a danger to life and can cause a fire. See that the connecting cable does not stick
nor touch sharp edges or a hot welding piece.
Welding current circuit
Isolate yourself from the welding current circuit by wearing dry and undamaged protec-
tive clothing. Never work on a wet surface. Never use damaged welding cables. Never
set electrode holder, earth clamp nor the welding cables on top of the power source or
other electric equipment.
Welding fumes
Ensure adequate ventilation. Always take special measures when welding metals con-
taining lead, cadmium, zinc, mercury or beryllium.
2. BEFORE YOU START USING THE UNIT
2.1. UNPACKING
The equipment is packed in durable, specially for them designed packages. Neverthe-
less, always before using the equipment to use, make certain it was not damaged during
transportation. Also check that you have received, what you ordered and that there
are instructions for it. NOTE the packaging material of the products is suitable for
recycling.
2.2. PLACING THE UNIT
Place the unit on level, solid and clean surface. Shield it from heavy rain and scorching
sun. Make certain cooling air circulates freely.
2.3. SERIAL NUMBER
Serial number of the unit is marked on the name plate on the unit. The serial number
makes it possible to trace product manufacturing series. You might need the serial
number placing spare parts orders or when planning maintenance .

©COPYRIGHT KEMPPI OY
Minarc/0244 – 5
2.4. MAIN COMPONENTS OF THE UNIT
Connect welding cable and earth cable to their connections on the power source. Mains
cable and wall plug are already installed.
Parts of the unit
A Body of machine
B Main power switch and signal light
C Selector switch for welding
process
D Welding current regulator
E Signal light for overheating
F Electrode holder and welding
cable
G Earth cable and clamp
H Mains cable
2.5. CONNECTING TO POWER SUPPLY MAINS
The unit has a mains cable and a wall plug. You can find fuse and cable sizes in the end
of these instructions on Technical information table.
2.6. FILLER MATERIALS AND EQUIPMENT
See also 2.4. Main components of the unit. You can use all electrodes intended for
welding with DC. Suitable electrode sizes for the unit are listed in the end of these
instructions in chapter Technical information.
1. Use welding specifications given on electrode package.
2. Check that you have selected the correct welding process, before starting
to weld.
3. Check that welding cable and earth cable connections are tight. If a connec-
tion is slack, it will result in voltage drop, that will cause the connection
to heat.
4. Mount the electrode firmly in holder.
-+
A
H
B
C
D
E
G
F

©COPYRIGHT KEMPPI OY
6 – Minarc/0244
3. USE
It is forbidden to weld in places where is a danger of fire or explosion!
3.1. WELDING PROCESSES
3.1.1. Manual Metal arc welding (MMA)
In manual metal arc (MMA) the welding filler material is melted from the electrode to
the weld pool. Filler and rate of welding current is selected on basis of used electrode
size and welding position. Arc forms between electrode end and welding piece. The
melting electrode coating forms gas and slag, that protects the weld pool. Slag solidified
over the weld is removed after welding with e.g. a chipping hammer.
3.1.2. TIG welding
In DC TIG welding the arc between a non-melting tungsten electrode and the welding
piece melts the welding piece, where weld pool forms. Arc and electrode are shielded by
an inert shielding gas (Argon). If necessary, filler is used. Filler wire is fed into the weld
pool from the outside of the arc. Filler and rate of welding current is selected on the
basis of diameter of tungsten electrode and welding position in use.
3.2. OPERATING FUNCTIONS
See also 2.4. Main components and 3.4. Welding selections.
A Main switch and signal light
B Welding process selecting switch
C Welding current adjuster
D Signal light on overheating
Main switch and signal light
When you put the main switch in position I, signal light is lit and the unit is ready for
welding. Signal light is always on, when the unit is connected to the mains and the main
switch is in position I.
Note! Always start and stop the machine from the main switch, never use the plug
as a switch!
Welding process selector, MMA / TIG switch is used for selecting either
MMA or TIG welding, depending on welding target.
Regulating welding current
Welding current rate is steplessly regulated with an adjusting potentiometer.
Signal light for overheating
A yellow signal light of overheating is lit, when thermostat has tripped because of the
unit’s overheating. Fan will cool the unit and after the signal light goes off, the unit is
again ready for welding.
3.3. WELDING SELECTIONS
3.3.1. Manual Metal arc welding (MMA)
Select welding parameters based on filler manufacturer’s recommendations.
1. Select polarity (+ or -) of welding current cable and return current cable in
accordance with filler.
2. Select MMA welding with the switch .
3. Select suitable welding current on adjusting potentiometer scales.
B
A
DC

©COPYRIGHT KEMPPI OY
Minarc/0244 – 7
3.3.2. DC TIG welding
Select welding parameters based on filler manufacturer’s recommendations.
1. Connect TIG torch to - pole and earth cable to + pole
2. Select TIG welding with the switch .
3. Select suitable welding current on adjusting potentiometer scales.
3.4. WELDING SELECTIONS
Welding fumes may be dangerous to your health, see that there is ample
ventilation during welding!
Never look at the arc without face shield made for arc welding! Protect
yourself and your surroundings from the arc and hot spatter!
3.4.1. Earth
If possible, always fix earth cable clamp directly on the welding piece.
1. Clean connection surface of earth clamp from paint and rust.
2. Connect the clamp carefully so, that contact surface is as large as possible.
3. Finally check that the clamp sits tight
3.4.2. Welding
See also 3.1. Welding processes and 3.4. Welding selections. Note! It is advisable to
test welding and rate of welding current first on something else than the actual welding
piece.
You can start welding after having made necessary selections. Arc is lit by scratching
the welding piece with electrode. Length of arc is regulated by holding electrode tip
a suitable distance from welding piece. Suitable arc length is usually about half the
diameter of the electrode core wire. When arc is lit move the electrode slowly forwards
tilting it to appr. 10-15° pulling angle. If necessary, adjust current value.
Shielding gas is used in DC TIG welding. Your dealer will give you advice on choosing
gas and equipment. Open the gas valve on the TTM 15V TIG torch. When gas starts to
flow, arc is lit by lightly scratching welding piece with the tip of the tungsten electrode.
When arc is lit, its length is regulated by holding the tip of the tungsten electrode at
a suitable distance from the welding piece. Move the torch forwards from the starting
point. Usually in appr. 10-15° pushing angle forwards. If necessary, regulate current
rate. Stop welding by lifting the torch off the welding piece and by closing the gas
valve on the torch.
Note! Always fix the gas cylinder so that it stays steadily in upright position either
in specially made wall rack or cylinder trolley. Always close the cylinder valve after
finishing welding.
3.5. STORING
Store the unit in a clean and dry place. Shield it from rain, and in temperatures
exceeding 25 °C shield it from direct exposure to sun.
4. MAINTENANCE
Be careful when handling electrical cables!
In maintaining the unit take into consideration rate of use and the environment it is used
in. When the unit is used properly and regularly serviced, you will avoid unnecessary
disturbances in use and production.

©COPYRIGHT KEMPPI OY
8 – Minarc/0244
4.1. DAILY MAINTENANCE
Perform the following maintenance daily:
Clean electrode holder and TIG torch’s gas nozzle. Replace damaged or
worn parts.
Check TIG torch’s electrode. Replace or sharpen, if necessary.
Check tightness of welding and earth cables connections.
Check condition of mains and welding cables and replace damaged cables.
See that there is enough space in front and back of the unit for ventilation.
4.2. ORDERING NUMBERS
Item Ordering number
Minarc 140 welding machine 6102140
(includes earth- and welding cables)
Minarc 110 welding machine 6102110
(includes earth- and welding cables)
Earth cable and clamp 6184005
Welding cable and electrode holder 6184015
Optional:
TIG torch TTM15V and welding cable 6271432
4.3. TROUBLESHOOTING
Main switch signal light is not lit.
Unit does not get electricity.
Check mains fuses and replace when necessary.
Check mains cable and plug, replace damaged parts.
Unit does not weld well.
Arc is uneven and goes off. Electrode gets stuck in weld pool.
Check welding settings and adjust when necessary. See 3. Use.
Check that earth clamp is properly fixed and that contact surface is clean and
the cable is undamaged. See 3.4. Welding and 4.1. Daily maintenance.
Overheat signal light is lit.
The unit has overheated. See 3.2. Operating functions.
Check that there is ample space in front of and back of the unit for ventilati-
on.
Check welding settings. See 3.3. Welding selections.
If problems in use are not solved with above mentioned measures, contact Kemppi serv-
ice.

©COPYRIGHT KEMPPI OY
Minarc/0244 – 9
5. TECHNICAL INFORMATION AND GUARANTEE
CLAUSES
5.1. TECHNICAL INFORMATION
Minarc 140 Minarc 110
Connection voltage,
1 ~ phase 50/60Hz 220V-10%...240V + 6% 220V-10%...240V + 6%
Connection capacity
35 % ED 140 A
50 % ED 110 A
100 % ED 100 A 80 A
Mains cable/fuse, delayed 2,5 mm2S /3,3 m 16 A 1,5 mm2S /2,0 m 13 A
Welding current range,
Metal arc welding (MMA) 10 A/20,5 V...140 A/25,6 V 10 A/20,5 V...110 A/24,4 V
Electrodes, diameter Ø1,5...3,25 mm Ø1,5...2,5 mm
Welding current control range stepless stepless
Open-circuit voltage 85V 85V
Open-circuit power <10 W <10W
Efficiency 80% 80%
Power factor 0,60 (140A/25,5 V) 0,60 (110A/24,4 V)
Degree of protection IP 23C IP 23C
Temperature class B (130°C)/H (180°C) B (130°C)/H (180°C)
Range of working temperature -20...+40°C -20...+ 40°C
Range of storage temperature -40...+60°C -40...+60°C
Degree of protection IP23C IP23C
Norms IEC 974-1 IEC 974-1
EN 50199 EN 50199
External dimensions:
length 305 mm 123 mm
height 250 mm (207 mm) 250 mm (207 mm)
Weight 4,2 kg (4,8 kg) 4,2 kg (4,6 kg)
The unit fulfils CE marking demands.

©COPYRIGHT KEMPPI OY
10 – Minarc/0244
5.2. GUARANTEE CLAUSES
KEMPPI OY gives the machines and equipment it manufactures and sells a guaran-
tee concerning defects in manufacturing or raw materials. Guarantee repairs can only
be made by approved KEMPPI repair shop. Buyer will pay for packaging, freight and
insurance. Guarantee is valid from the day of purchase. Orally given promises, not
included in guarantee clauses do not bind the guarantor.
Restrictions in guarantee
Guarantee does not cover damage caused by natural wear, use not in accordance with
the instructions, overload, carelessness, neglect of following maintenance instructions,
wrong mains voltage or gas pressure, disturbances or problems in mains network, dam-
ages during transportation or storing, or caused by fire or natural fenomena. Guarantee
does also not cover direct nor indirect travel expenses (day allowances, accommodation,
freight etc. ).
Guarantee does also not cover welding torches and their consumables, nor feed rolls and
wire conduits in wire conduit units. Guarantee does not cover direct or indirect damages
caused by faulty product.
Guarantee expires if there are any changes made into the unit, that are not approved
by the manufacturer, or if other than original spare parts are used in repair works.
Guarantee expires, if repair works are performed by other than KEMPPI or authorised
by KEMPPI service workshop.
Guarantee period
Guarantee period is 1 (one) year, the unit is used in one shift daily. If it is used in
two shifts daily, guarantee period is 6 (six) months and in three daily shifts guarantee
period is 4 (four) months .
Making guarantee repairs
Faults that need guarantee repairs must be immediately, within guarantee period,
reported to KEMPPI or authorised by KEMPPI service workshop. Before starting
guarantee repair, the customer must present a guarantee document filled by the seller
or otherwise proof in writing, with a purchasing receipt, bill or delivery documents,
that the guarantee period has not expired. The document must contain date of purchase
and manufacturing number of the unit to be repaired. Parts changed in guarantee repair
remain KEMPPI property. Guarantee of repaired or exchanged machine or equipment
continues until the end of original guarantee period.