Lincoln Electric SP20/MP2 Series Mounting instructions

MICROPLASMA WELDING TORCH
SP20 / MP2
SP45 / MP5
SAFETY INSTRUCTION FOR USE AND MAINTENANCE
EDITION : EN Instructions for use REF : 8695 9001
REVISION : E
DATE : 07-2018 Original instructions

Thank for the trust you have expressed by purchasing this equipment, which
will give you full satisfaction if you follow its instructions for use and
maintenance.
Its design, component specifications and workmanship comply with
applicable European directives.
Please refer to the enclosed CE declaration to identify the directives
applicable to it.
The manufacturer will not be held responsible where items not
recommended by themselves are associated with this product.
For your safety,there follows a non-restrictive list of recommendations or
requirements, many of which appear in the employment code.
Finally we would ask you kindly to inform your supplier of any error which
you may find in this instruction manual.

8695 9001
SP20/SP45 - MP2/MP5 I
CONTENTS
A - SAFETY INSTRUCTIONS............................................................................................................1
B - DESCRIPTION .............................................................................................................................2
1 - SP20/MP2 TORCH.............................................................................................................2
2 - SP45/MP5 TORCH.............................................................................................................2
C - INTRODUCTION ..........................................................................................................................3
1 - SP20 AND SP45 MANUAL & AUTOMATIC MICROPLASMA WELDING TORCHES.......3
2 - GENERAL SPECIFICATIONS............................................................................................3
3 - SP20 AND SP45 MANUAL TORCH ARC CONTROL UNIT...............................................4
D - DIMENSIONS AND ATTACHMENT .........................................................................................5
1 - MANUAL AND AUTOMATIC TORCHES............................................................................5
E - DELIVERY STATE .......................................................................................................................6
1 - SP20/45 MANUAL AND AUTOMATIC TORCHES............................................................6
F - USING SP20/45 AND MP2/5 TORCHES ....................................................................................8
1 - CHOOSING THE CONSTRICTING NOZZLE.....................................................................8
2 - CHOOSING ELECTRODESTIPPINGFITTINGTO THE TORCH .......................................8
G - OPERATING HINTS AND TIPS...................................................................................................10
1 - CONNECTING THE TORCH..............................................................................................10
2 - PRECAUTIONS LINKED WITH COOLING ........................................................................10
3 - FITTING THE CONSTRICTING NOZZLES........................................................................10
4 - UTILISATION DURING WELDING.....................................................................................11
H - FITTING A CCESSORIES............................................................................................................12
I - COMPONENT IDENTIFICATION ..................................................................................................14
1 - SP20/SP45 (MP2/MP5) MANUAL AND AUTOMATIC TORCHES ....................................14
2 - SP20 / MP2 MICROPLASMA WELDING TORCH ..........................................................16
3 - SP45 / MP5 MICROPLASMA WELDING TORCH ..........................................................18
PERSONAL NOTES ..........................................................................................................................20

8695 9001
II SP20/SP45 - MP2/MP5
REVISIONS
REVISION B 05/95
DESIGNATION
PAGE
Updating ISEE
6 and 7
REVISION C 07/06
DESIGNATION
PAGE
To change logo
REVISION D 02/16
DESIGNATION
PAGE
Complete update
REVISION E 07/18
DESIGNATION
PAGE
Complete update LEE

8695 9001 / E
SP20/SP45 - MP2/MP5 A-1
A - SAFETY INSTRUCTIONS
For general safety instructions, please refer to the specific manual supplied with the
equipment.

8695 9001 / E
B-2 SP20/SP45 - MP2/MP5
B - DESCRIPTION
1 - SP20/MP2 TORCH
Delivered without accessories. (Shielding nozzle, nozzle and electrode parts)
4M
8M
SP20 / MP2 manual
W000315653
W000370620
SP20 / MP2 automatic
W000315655
W000370621
2 - SP45/MP5 TORCH
Delivered without accessories. (Shielding nozzle, nozzle and electrode parts)
4M
8M
SP45 / MP5 manual
W000273236
W000315652
SP45 / MP5 automatic
W000273237
W000370619

8695 9001 / E
SP20/SP45 - MP2/MP5 C-3
C - INTRODUCTION
1 - SP20 AND SP45 MANUAL & AUTOMATIC MICROPLASMA WELDING
TORCHES
The manual and automatic torches SP20 and SP45 are specially designed for low
current plasma welding only: from 0.3 to 45 A.
They are fitted with a 4 or 8 meters long harness which can be connected to
amicro-plasma power source such as NERTAMATIC 50 or PLASMAFIX 51.
The service provided by these high-performance tools can only bemaintained if the
operating and maintenance instructions described in this technical instruction are
respected.
This is why we recommend all our customers, technical, purchasing and
maintenance departments, production supervisors and foremen to make this
instruction available to operators.
SP20 and SP45 torches are only operational when they are accompanied by their
accessory kit which is supplied separately under another reference.
2 - GENERAL SPECIFICATIONS
SP20 - MP2
SP45 - MP5
4M
8M
4M
8M
References « manu »
W000315653
W000370620
W000273236
W000315652
References « auto »
W000315655
W000370621
W000273237
W000370619
Accessory kit « manu »
W000370622
W000370622
W000315651
W000315651
Accessory kit « auto »
W000370777
W000370777
Current
20A100%
20A100%
45A100%
45A100%
Weight « manu »
1,30 kg
2,00 kg
1,45 kg
2,35 kg
Weight « auto »
0,96 kg
1,70 kg
1,30 kg
2,20 kg
Admissible electrodes
1 mm
75or150mm
2% thorium
2% lanthanium
1 mm
75or150mm
2% thorium
2% lanthanium
1 to 1,6 mm 75
or150mm2%
thorium 2%
lanthanium
1 to 1,6 mm
75or150mm
2% thorium
2% lanthanium
Cooling
FREEZCOOL
2 L/min
FREEZCOOL
2 L/min
FREEZCOOL
2,2 L/min
FREEZCOOL
2,2 L/min
Central gas
0,1 L/min à
1,0L/min
0,1L/min à
1,0L/min
0,1L/min à
1,0L/min
0,1L/minà
1,0L/min
Annular gas
2 L/min à
12L/min
2 L/min à
12L/min
2L/minà
12L/min
2L/minà
12L/min
Automatic torch fixing
It can be attached by a clip on the handle Ø 24 mm.

C - INTRODUCTION 8695 9001 / E
C-4 SP20/SP45 - MP2/MP5
3 - SP20 AND SP45 MANUAL TORCH ARC CONTROL UNIT
This control unit fits onto the handle and has two buttons:
The red button controls welding arc transfer,
The green button is used to trigger the arc extinction cycle which can only
be total if the red button is pressed again.
CONNECTION HARNESS
It is a total of 4 meters long and is protected by a PVC sheath, it has two gas hoses
and two water hoses.
Two of these hoses are doubled up with a cable which supplies the current for
welding and for the pilot arc. The second cable is for the pilot arc current return.
In addition, the SP20 / SP45 manual torches harness has the control cable fitted
with a connector which connects directly to the NERTAMATIC 50 or PLASMAFIX 51
power source.
ADMISSIBLE CONSTRICTING NOZZLES
Six current models of constricting nozzle can be chosen from the accessories kit.
They are characterised by the diameter of the plasma jet ejection orifice which itself
depends of the welding current: Ø 0,6-0.8-1-1.2-1.5-1.8 mm.
These constricting nozzles are cooled by a tapered heat exchange surface located
to the rear of each constricting nozzle.
SHIELDING GAS NOZZLES
These refractory nozzles are made of sintered alumina.
They are differentiated by their shielding diameter: 7-8-9-10-11 mm.
The choice is made depending on torch accessibility to the zone to be welded; the
largest diameter is recommended to obtain good gas shielding of the molten metal.

8695 9001 / E
SP20/SP45 - MP2/MP5 D-5
D - DIMENSIONS AND ATTACHMENT
1 - MANUAL AND AUTOMATIC TORCHES
SP20 / MP2
Manu
Auto
SP45 / MP5
Manu
Auto

8695 9001 / E
E-6 SP20/SP45 - MP2/MP5
E - DELIVERY STATE
1 - SP20/45 MANUAL AND AUTOMATIC TORCHES
SP 20/45 manual and automatic torches are supplied unequipped.
That is to say :
complete connection harness, body equipped with short electrode clamping
plug
They are only operational when accompanied by the accessory kit described
below.
ACCESSORY KITS SP20 /MP2
Ref : W000370622 (Manu)
Ref : W000370777 (Auto)
This kit contains the following parts:
3 constricting nozzles Ø 0.6 mm
3 constricting nozzles Ø 0.8 mm
3 constricting nozzles Ø 1.0 mm
3 constricting nozzles Ø 1.2 mm
2 electrode holder clamps for electrodes Ø 1 mm
1 alumina gas nozzles Ø 8 mm
1 alumina gas nozzles Ø 10 mm
2 centering collars for electrode Ø 1.0 mm
2 electrode centering devices Ø 1 mm
2 nozzle seals
2 clamping plug seals
1 electrode positioning tool (manual)
1 electrode positioning tool (automatic)
5 electrodes Ø 1 mm
2 fixing nuts (automatic)
ACCESSORY KITS SP45 /MP5
Ref : W000315651
This kit contains the following parts:
2 constricting nozzles Ø 0.8 mm
2 constricting nozzles Ø 1.0 mm
2 constricting nozzles Ø 1.2 mm
2 constricting nozzles Ø 1.5 mm
2 constricting nozzles Ø 1.8 mm
2 electrode holder clamps for electrodes Ø 1 mm
2 electrode holder clamps for electrodes Ø 1.6 mm
1 alumina gas nozzle Ø 7 mm
1 alumina gas nozzle Ø 9 mm
1 alumina gas nozzle Ø 11 mm
2 centering collars for electrode Ø 1.0 mm
2 centering collars for electrode Ø 1.6 mm
2 electrode centering devices Ø 1 mm
2 electrode centering devices Ø 1.6 mm
2 nozzle seals
2 clamping plug seals
1 electrode positioning tool
5 electrodes Ø 1 mm
5 electrodes Ø 1.6 mm

8695 9001 / EE - DELIVERY STATE
SP20/SP45 - MP2/MP5 E-7

8695 9001 / E
F-8 SP20/SP45 - MP2/MP5
F - USING SP20/45 AND MP2/5 TORCHES
1 - CHOOSING THE CONSTRICTING NOZZLE
This choicemust bemade according to the assembly to be welded and is
characterised firstly by the thickness and secondly by the grade of thematerial to be
welded which requiresmore or less energy.
Manual and automatic welding modes can equally well be used, although
automatic welding is generally used at a higher speed than manual welding.
Automatic welding, in the same context, uses higher arc currents.
These criteria determine the necessary current level which in turn determines the
best adapted constricting nozzle orifice diameter.
In all cases, the current ranges, depending on orifice diameter, are the following:
Constricting
nozzle diameter
Min current
Max current
0,6 mm
0,3 A
6 A
0,8 mm
6 A
12 A
1,0 mm
9 A
18 A
1,2 mm
12 A
25 A
1,5 mm
18 A
36 A
1,8 mm
25 A
45 A
To determine an operating point for an assembly to be welded, we recommend that
you carry out a test with large orifice constricting nozzle and then change to a smaller
orifice if the current which seems ideal does not con formthe above table.
2 - CHOOSING ELECTRODESTIPPINGFITTINGTO THE TORCH
The diameter 1 mm electrode must be used for currents less than or equal to 20 A.
The SP 20/45 accessory kit contains electrodes 150 mm long.
Electrodes 150mmlong can be fitted using a long electrode clampin g plug which is
not supplied in the kit (see reference in spare parts list).
At spares level, we recommend that you order the electrodes whose references
also appear in the expendable items list.
The quality of these electrodes, which contain 2% thorium oxide, associated with
the efficiency of the NERTAMATIC 50 or PLASMAFIX 51 arc striking system, ensure
that the pilot arc lights cleanly and that the plasma arc.
Since tungsten oxidise very easily when hot, the electrodes must constantly be
shielded under neutral gas, including during the cooling period which follows welding
stop.

8695 9001 / EF - USING SP20/45 AND MP2/5 TORCHES
SP20/SP45 - MP2/MP5 F-9
Any black or blue-coloured marks indicate a post-gas fault.
POINTING
Pointing must be done using a grinding wheel, it is preferable not to hold the
electrode manually.
Ensure that the particles are removed along the generating lines of the cone whose
vertex angle must be 20 to 25%. This reduces erosion of the tungsten.
We also recommend terminating the grinding using a fine grain abrasive since the
resistance of the electrode in service is favoured when the surface finish of the
emissive part is carefully prepared.
The tip of the electrode point, which is vulnerable when striking the arc,must be
carefully eliminated by rubbing the point on a sheet of very fine grade abrasive.
Ensure that the grinding wheel is not a multi-purpose one since contaminant
particles could be deposited on the electrode.
To eliminate a deformed or contaminated point before pointing, or to cut a 150mm
electrode, never clamp the electrode in pliers or a vice, and never hit it with a hammer
to break the electrode or snap off the piece to be eliminated.
This type of operation risks creating micro cracks at the grain joints, or more simply
a deformation of the electrode structure which can cause cracks at high temperature;
cracks which will reduce the life of the electrode or cause plasma jet deviation.
To shorten an electrode, we recommend that you notch the
electrode using the grinding wheel.
Use only straight electrodes with points concentric to the orifice
of the constricting nozzle to obtain a deviation-free plasma jet.

8695 9001 / E
G-10 SP20/SP45 - MP2/MP5
G - OPERATING HINTS AND TIPS
SP 20/45 torches are packed in very clean conditions; the gas circuits have been
cleaned with dry nitrogen.
We recommend that the torch only be unpacked at the moment it is to be
connected to the NERTAMATIC 50 or PLASMAFIX 51 power sources and that the
circuits be purged before lighting the arc, using the welding gases, that is to say, Pure
ARGON for the plasma gas circuit. ARGON + 5 % H2 (for general cases where
hydrogen is usable).
1 - CONNECTING THE TORCH
The harness must be inserted into the rubber sleeve provided on the front of the
generator, this is done after opening the access door to the connections which is
located on the left side of the generator.
Immobilise the harness on its protective sheath by tightening the collar provided on
the rubber sleeve. Connect the 2 gas hoses and the two water hoses by matching up
the colour codings.
Moderately tighten the four connections using a wrench. For the SP 20/45 manual
torches, connect the control connector to the corresponding socket.
Purge the cooling circuits for a few minutes and check that there are no water
leaks.
2 - PRECAUTIONS LINKED WITH COOLING
The SP 20/45 torches can be dama ged by frost. Also, water with high mineral salt
content can affect its cooling by favouring deposition of these minerals at the hot spots
in the torch and in the internal passages.
It is for both these reasons that we recommend that only the premixed ready-to-
use coolant liquid supplied with the installation be used.
3 - FITTING THE CONSTRICTING NOZZLES
To ensure good thermal contact between the constricting nozzle and the water-
cooled torch head, the torch head must be clamped slightly (ensure that the tapered
contact faces are clean).

8695 9001 / EG - OPERATING HINTS AND TIPS
SP20/SP45 - MP2/MP5 G-11
4 - UTILISATION DURING WELDING
Follow instruction n° 415.18 for the NERTAMATIC 50 or PLASMAFIX 51 power
source for everything concerning its startup, presettings, gas flow adjustments and
pilot arc lighting.
Place the constricting orifice at an average distance of 2 mm from the welding
surface.
In the case of a SP20 or SP45 manual torch:
pressing the red button sets welding arc transfer to starting current: the
current rise phase only takes place when the red button is released,
holding down the green button controls the arc extinction cycle which is
only total when the red button is pressed again.

8695 9001 / E
H-12 SP20/SP45 - MP2/MP5
H - FITTING A CCESSORIES
Hold the torch body vertically and insert the following elements into it.
- The alumina electrode centering sleeve (1) (use correct diameter: Ø 1 or 1.6 mm)
- The centering collar (2) in the centering sleeve (use correct diameter: Ø 1 or 1.6
mm)
- The copper electrode holder clamp (3), tapered end facing forward, (use correct
diameter Ø 1 or 1.6 mm), then screw the electrode positioning tool in place of the
constricting nozzle (4).
Insert the electrode in the torch body until its point is in contact with the positioning
tool's reference face.
Fit the long or short plug and hand tighten it, this immobilise the electrode.
Remove the positioning tool and replace it by the constricting nozzle by tightening
the electrode holder clamp slightly to get a good thermal contact with the torch body.
To carry out operations on the inside of the torch, we recommend that the body be
held vertically with the constricting nozzle facing down, and if possible hold it over a
table in case one of the internal parts drops out.
SP20 / MP2
SP45 / MP5

8695 9001 / EH - FITTING A CCESSORIES
SP20/SP45 - MP2/MP5 H-13

8695 9001 / E
I-14 SP20/SP45 - MP2/MP5
I - COMPONENT IDENTIFICATION
1 - SP20/SP45 (MP2/MP5) MANUAL AND AUTOMATIC TORCHES

8695 9001 / EI - IDENTIFICATION DES COMPOSANTS
SP20/SP45 - MP2/MP5 I-15
SP20 / MP2

normally in stock

not in stock
on request
Item
Ref.
Stock
Order
Designation
1
W000370629
SP20/MP2manual torch body (x1)
EG207229-U
1
W000370631
SP20/MP2 automatic torch body (x1)
EG207254-U
2
W000370633
SP20/MP2 manual torch handle and trigger (x1)
EG309642
2
W000370636
SP20/MP2 automatic torch handle (x1)
EG309901
3
W000371888
Cable assembly SP20/MP2 manual 4m (x1)
3
W000371886
Cable assembly SP20/MP2 manual 8m (x1)
3
W000371887
Cable assembly SP20/MP2 automatic 4m (x1)
3
W000371885
Cable assembly SP20/MP2 automatic 8m (x1)
4
W000371884
Plug 3 poles (x1)
E4722103GN
For parts order, give the quantity required and put the number of your machine in the box below.
TYPE: ........................................................................
Number: ........................................................................
SP45 / MP5

normally in stock

not in stock
on request
Item
Ref.
Stock
Order
Designation
1
W000370628
SP45/MP5 manual torch body (x1)
EG207238-U
1
W000370630
SP45/MP5 automatic torch body (x1)
EG207247-U
2
W000370632
SP45/MP5 manual torch handle and trigger (x1)
EG207239
2
W000370634
SP45/MP5 automatic torch handle (x1)
EG309677
3
W000371892
Cable assembly SP45/MP5 manual 4m (x1)
3
W000371890
Cable assembly SP45/MP5 manual 8m (x1)
3
W000371891
Cable assembly SP45/MP5 automatic 4m (x1)
3
W000371889
Cable assembly SP45/MP5 automatic 8m (x1)
4
W000371884
Plug 3 poles (x1)
E4722103GN
For parts order, give the quantity required and put the number of your machine in the box below.
TYPE: ........................................................................
Number: ........................................................................

I - IDENTIFICATION DES COMPOSANTS 8695 9001 / E
I-16 SP20/SP45 - MP2/MP5
2 - SP20 / MP2 MICROPLASMA WELDING TORCH