widos MINIPLAST 2 / T-Piece User manual

Kunststoffschweißtechnik
WIDOS Einsteinstr. 5 Phone ++49 (0)7152 / 9939 - 0
W. Dommer Söhne GmbH D-71254 Ditzingen-Heimerdingen Fax ++49 (0)7152 / 9939 - 40
http://www.widos.de email: [e-mail]
Headquarters: D-71254 Ditzingen-Heimerdingen County court Stuttgart HRB 200973 Managing Director: Jürgen Dommer
Working Instructions
Translation
Heating Element Butt Welding Machine
WIDOS MINIPLAST 2
Keep for further use!

Kunststoffschweißtechnik
Product Identification
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 2 of 42
Model: Heating element butt welding machine
Type: WIDOS MINIPLAST 2
Serial number / year: see type plate
Customer entries
Inventory-No.:
Place of working:
Order of spare parts and sales service:
Address of manufacturer WIDOS
W. Dommer Söhne GmbH
Einsteinstr. 5
D -71254 Ditzingen-Heimerdingen
Phone: ++49 (0) 71 52 99 39 - 0
Telefax: ++49 (0) 71 52 99 39 - 40
Address of the Subsidiary Companies:
WIDOS
WIDOS GmbH W. Dommer Söhne AG
An der Wiesenmühle 15 St. Gallerstr. 93
D-09224 Grüna / Sachsen CH-9201 Gossau
Phone: ++49 371 / 8 15 73 - 0 Phone: [phone]
Fax: ++49 371 / 8 15 73 - 20

Kunststoffschweißtechnik
Introduction
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 3 of 42
Purpose of the document
These working instructions give you information about all important questions which refer to
the construction and the safe working of your machine.
Just as we are, you are obliged to engage in these working instructions, as well.
Not only to run your machine economically but also to avoid damages and injuries.
Should questions arise, contact our service team in the factory or in our subsidiary companies.
We will help you with pleasure.
According to our interest to continuously improve our products and working instructions, we
kindly ask you to inform us about problems and defects which occur in exercise.
Thank you.
Structure of the working instructions
This manual is arranged in chapters which belong to the different using phases of the
machine.
Due to this structure, the searched information can be easily found.
14.04.2014 WIDOS
W.Dommer Söhne GmbH
Einsteinstraße 5
D-71254 Ditzingen-Heimerdingen
All rights reserved
Reprinting only allowed with permission of the corporation.
Any changes prior to technical innovations.

Kunststoffschweißtechnik
Contents
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 4 of 42
1. DESCRIPTION OF THE PRODUCT ....................................................................6
1.1. Usage and purpose-oriented use........................................................................................6
1.2. Overview................................................................................................................................6
1.3. Safety measures ...................................................................................................................7
1.4. Conformity.............................................................................................................................7
1.5. Designation of the product..................................................................................................7
1.5.1 Technical data ....................................................................................................................7
1.6. Equipment and accessories:...............................................................................................8
2. SAFETY RULES ..................................................................................................9
2.1. Explanation of the Symbols and Indications.....................................................................9
2.2. Obligations of the Owner.....................................................................................................9
2.3. Obligations of the worker ..................................................................................................10
2.4. Measures of organisation ..................................................................................................10
2.5. Instructions for the staff ....................................................................................................10
2.6. Structural modifications on the machine.........................................................................10
2.7. Cleaning the machine.........................................................................................................10
2.8. Danger while handling the machine .................................................................................11
2.9. Dangers caused by electric energy ..................................................................................11
2.10. Specific dangers.................................................................................................................11
2.10.1 Danger of being burnt by heating element, reception box and welding area..................11
2.10.2 Danger of stumbling over electric wires ...........................................................................11
2.10.3 Danger of cutting / squeezing / catching clothes..............................................................12
2.10.4 Risk of injury by noises.....................................................................................................12
2.11. Warranty and liability..........................................................................................................12
3. FUNCTIONAL DESCRIPTION...........................................................................13
4. OPERATING AND INDICATING ELEMENTS ...................................................14
4.1. Elements on the basic machine / table support ..............................................................14
4.2. Elements at Heating Element and Planer.........................................................................15
4.3. Elements at the Electric Planer (optional)........................................................................16
5. STARTING AND OPERATING ..........................................................................17
5.1. Starting.................................................................................................................................17
5.1.1 Exchanging the Reduction Inserts....................................................................................18
5.2. Welding Process.................................................................................................................18
6. WELDING TABLES ...........................................................................................21
7. MAINTENANCE AND REPAIR..........................................................................25
7.1. General.................................................................................................................................25

Kunststoffschweißtechnik
Contents
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 5 of 42
7.2. Clamping Elements.............................................................................................................25
7.3. Planer...................................................................................................................................25
7.4. Storage.................................................................................................................................25
7.5. Disposal...............................................................................................................................25
8. TRANSPORT.....................................................................................................26
9. WIRING DIAGRAMS..........................................................................................27
10. SPARE PARTS LIST .........................................................................................28
10.1. Basic machine with clamping devices and reduction inserts .......................................28
10.2. Table support ......................................................................................................................30
10.3. Clamping devices for fittings ............................................................................................32
10.4. Manual planer 4504220.....................................................................................................34
10.5. Electric planer (optional)....................................................................................................36
10.6. Heating element..................................................................................................................38
10.7. Protective box .....................................................................................................................40
11. DECLARATION OF CONFORMITY ..................................................................42

Kunststoffschweißtechnik
WIDOS Einsteinstr. 5 Phone ++49 (0)7152 / 9939 - 0
W. Dommer Söhne GmbH D-71254 Ditzingen-Heimerdingen Fax ++49 (0)7152 / 9939 - 40
http://www.widos.de email: [e-mail]
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 6 of 42
1. Description of the product
This chapter gives important basic information about the product and its prescribed use.
All technical details of the machine are put together as a general arrangement.
1.1. Usage and purpose-oriented use
The WIDOS MINIPLAST 2 has been designed for heating element butt welding of pipes
and fittings out of PE, PP and PVDF with a diameter range of Ø = 20 - 110 mm.
The machine is kept small so that it can easily be used in the pipe system.
For moulded narrow bends and fittings, special small basic clamping devices are available.
All use going beyond is not purpose-oriented.
The manufacturer is not responsible for damages caused by misuse.
The risk is held only by the user.
Also part of the purpose-oriented use is
respecting all the indications of the working instructions and
performing the inspection and maintenance works.
1.2. Overview
No. Denomination
1 Basic machine
2 Table support
3 Heating element
4 Electric planer (optional)
5 Clamping devices for fittings (optional)
6 Manual planer
1
2
3
5
4
6

Kunststoffschweißtechnik
Description of Product Chapter 1
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 7 of 42
1.3. Safety measures
In case of wrong use, wrong operation or wrong maintenance, the machine itself or products
standing nearby can be damaged or destroyed.
Persons being in the endangered area may be injured.
Therefore these working instructions have to be thouroughly read and the corresponding
safety regulations must be necessarily adhered to.
1.4. Conformity
The machine corresponds in its construction to the valid recommendations of the European
Community as well as to the according European standard specifications.
The development, manufacturing and mounting of the machine were made very carefully.
1.5. Designation of the product
The product is designated by a sign at the basic frame.
It contains the type of the machine, the serial number and the year of construction.
1.5.1Technical data
1.5.1.1 WIDOS MINIPLAST 2General Data
Material: PP, PE-HD, PVDF, PE 100
Pipe diameter range: Outside = 20 - 110 mm
Sheet steel carrying case (lxwxh): 450 x 300 x 365 mm
Weight (without packing): 30 kg
Fuse: 10 A
Wire cross section: 1.5 mm²
Emissions: - Noises exceeding 80 dB (A) may occur; during
planing it is obligatory to wear ear protection!
- When using the named pipe materials and
when welding below 260 °C no toxicant damp
arises.
Ambient conditions in the welding area: - Keep the workshop clean (no dust at the
welding area)
- If secured by an appropriate measurement that
allowed conditions for welding are indicated, it
is possible to work in any outside temperature
condition as far as the welder is not
constrained in its manual skill.
- Avoid humidity, if necessary use a welding tent
- Avoid strong sun rays influence
- Protect from wind, shut the pipe ends

Kunststoffschweißtechnik
Description of Product Chapter 1
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 8 of 42
1.5.1.2 Heating element
Power: 500 Watt 500 Watt
Voltage: 230 V (10 %) 110 V (10 %)
Current: 2,2 A (10 %) 4,5 A (10 %)
Frequency: 50 Hz 60 Hz
Outside : 145 mm
Surface: nonstick-coated
Attached elements: - electronic temperature control
- control lamp
- connecting cable with plug
Weight: appr. 2 kg
1.5.1.3 Manual planer
Weight: appr. 2 kg
1.5.1.4 Basic machine and table support
Material frame and clamping devices: Aluminium
Max. force 600 N
1.5.1.5 Electric planer (optional)
Power: 550 W 550 W
Voltage: 230 V (10 %) 110 V (10 %)
Current: 2,4 A 5,0 A
Frequency: 50 Hz 60 Hz
Weight: on request
See spare parts list for order numbers and single parts, when ordering, please state the machine number!
1.6. Equipment and accessories:
Following tools and accessories are part of the delivery:
1 Allan key, angled size 3 for screwing in / out the reduction inserts
1 Allan key, angled size 4, for mounting the fitting clamping devices (option)
1 Annular fork wrench size 10
1 Torx screwdriver T10, for changing the knifes
8 each Pan-head screws M 4x16 / 20 DIN 912, for mounting the reduction inserts
8 Flat-head screws M 6x12 DIN 7991, for mounting the fitting clamping devices
(option)

Kunststoffschweißtechnik
WIDOS Einsteinstr. 5 Phone ++49 (0)7152 / 9939 - 0
W. Dommer Söhne GmbH D-71254 Ditzingen-Heimerdingen Fax ++49 (0)7152 / 9939 - 40
http://www.widos.de email: [e-mail]
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 9 of 42
2. Safety rules
The base for the safe handling and the fault-free operation of this machine is the knowledge of
the basic safety indications and rules.
These working instructions contain the most important indications to run the machine safely.
The safety indications are to be followed by all persons working on the machine.
2.1. Explanation of the symbols and indications
In the working instructions, the following denominations and signs are used for dangers:
This symbol means a possibly danger for the life and the health of persons.
The disrespect of these indications may have heavy consequences for the
health.
This symbol means a possible dangerous situation.
The disrespect of these indications may cause slight injuries or damages on
goods.
This symbol means a possible dangerous situation due to hot surfaces.
The disrespect of these indications may conduct to heavy burns, respectively
to self-ignition or even fire.
This symbol means a possible risk of injury by noises exceeding 80 dB (A).
Ear protection is obligatory
This symbol gives important indications for the proper use of the machine.
The disrespect of these indications may conduct to malfunctions and
damages on the machine or on goods in the surrounding.
Under this symbol you get user tips and particularly useful information.
It is a help for using all the functions on your machine in an optimal way and
helps you to make the job easier.
The regulations for the prevention of accidents are valid (UVV).
2.2. Obligations of the owner
The owner is obliged only to let persons work at the machine who
know about basic safety and accident prevention rules and are instructed in the handling of
the machine, as well as who
have read and understood the safety chapter of this manual and certify this by their
signature.
The safety-conscious working of the staff has to be checked in regular intervals.

Kunststoffschweißtechnik
Safety Rules Chapter 2
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 10 of 42
2.3. Obligations of the worker
All persons who are to work at the machine are obliged before working:
to follow the basic safety and accident protection rules.
to have read and understood the safety chapter and the warnings in this manual and to
confirm by their signature that they have well understood them.
2.4. Measures of organisation
All equipment required for personal safety is to be provided by the owner.
All available safety equipment is to be inspected regularly.
The working instructions have to be permanently kept at the place of use of the machine.
They are to be at the operator‘s disposal at any time and without much effort.
In addition to the manual, the common valid and the local accident protection rules and
regulations for the environmental protection must be available and followed.
Every time the machine changes hands or is being rent to third persons, the working
instructions are to be sent along with and their importance is to be emphasized.
2.5. Instructions for the staff
Only skilled and trained persons are allowed to work at the machine.
It must be clearly defined who is responsible for transport, mounting and dismounting,
starting the operation, setting and tooling, operation, maintenance and inspection, repair
and dismounting.
A person who is being trained may only work at the machine under supervision of an
experienced person.
2.6. Structural modifications on the machine
No modifications, extensions or reconstructions may be made on the machine without
permission of the manufacturer.
Machine parts which are not in a perfect condition are to be replaced immediately.
Only use original WIDOS spare and wear parts.
2.7. Cleaning the machine
The used materials and tissues are to be handled and disposed of properly, especially:
when cleaning with solvents
when lubricating with oil and grease.

Kunststoffschweißtechnik
Safety Rules Chapter 2
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 11 of 42
2.8. Danger while handling the machine
The machine WIDOS MINIPLAST 2 is constructed according to the latest technical standards
and the acknowledged technical safety rules.
However, dangers for the operator or other persons standing nearby may occur.
Also material damages are possible.
The machine may only be used
according to the purpose-oriented usage
in safety technical impeccable status
Disturbances which may affect the safety of the machine must be cleared immediately.
2.9. Dangers caused by electric energy
Only skilled persons are allowed to work at electrical appliances.
The electrical equipment of the machine has to be checked regularly.
Loose connections and damaged cables have to be replaced immediately.
The heating element has to be protected from rain and dropping water, if need be use a
welding tent.
According to VDE 0100, the use on construction sites is only allowed with a power
distributor with a FI-safety switch.
2.10. Specific dangers
2.10.1 Danger of being burnt by heating element, reception box and
welding area
You can burn yourself, inflammable materials can be ignited!
The heating element is heated up to more than 200° C !
Do not leave the heating element unsupervised.
Take enough safety distance to inflammable materials.
Do wear safety gloves.
Always put the heating element back into the reception box before and after each use.
Transport the heating element at the handle only, do not touch the surfaces of the heating
element.
2.10.2 Danger of stumbling over electric wires
Make sure that no person has to step over the wires.

Kunststoffschweißtechnik
Safety Rules Chapter 2
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 12 of 42
2.10.3 Danger of cutting / squeezing / catching clothes
Always put the planer back into the reception box before and after each use.
Transport the planer at the handle only and do not touch surfaces.
Do not put hands between clamped pipe ends.
Make sure that your clothes are not caught by the planer.
2.10.4 Risk of injury by noises
Noises exceeding 80 dB (A) may occur; during planning (with electrical planer) it is
obligatory to wear ear protection!
2.11. Warranty and liability
Fundamentally our "General Sales and Delivery Conditions" are valid.
They are at the owner's disposal latest when signing the contract.
Guarantee and liability demands referring to personal injuries or damages on objects are
excluded if they are caused by one or several of the following reasons:
Not using the machine according to the prescriptions.
Inexpert transport, mounting, starting , operating and maintenance of the machine.
Running the machine with defective or not orderly mounted safety appliances.
Ignoring the information given in this manual.
Structural modifications on the machine without permission.
Unsatisfactory checking of parts of the machine which are worn out.
Repairs performed in an inexpert way.
In case of catastrophes and force majeure.

Kunststoffschweißtechnik
WIDOS Einsteinstr. 5 Phone ++49 (0)7152 / 9939 - 0
W. Dommer Söhne GmbH D-71254 Ditzingen-Heimerdingen Fax ++49 (0)7152 / 9939 - 40
http://www.widos.de email: [e-mail]
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 13 of 42
3. Functional description
Basically the international and national guidelines are to be
followed.
The plastic pipes are clamped by means of the clamping devices.
Then the front sides of the pipes are cut plane and parallel by means of the planer and the
misalignment of the pipes is checked.
The heating element is inserted and the pipes are pressed against the heating element under
defined adjusting pressure. This process is called "adjusting".
After the prescribed bead height being reached, pressure is reduced, the heating time begins.
The function of this time is to heat up the pipe ends.
After expiration of the heating time, the slides are opened, the heating element is removed
quickly and the pipes are driven together again. The time gap from the removal of the heating
element to joining the pipes is called change over time.
The pipes are joined under prescribed welding pressure and then cool down under pressure
(cooling time).
The welded joint can be unclamped, the welding process is finished.
Heating element heats
the pipes up to welding
temperature
Finished welding with
internal and external bead

Kunststoffschweißtechnik
WIDOS Einsteinstr. 5 Phone ++49 (0)7152 / 9939 - 0
W. Dommer Söhne GmbH D-71254 Ditzingen-Heimerdingen Fax ++49 (0)7152 / 9939 - 40
http://www.widos.de email: [e-mail]
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 14 of 42
4. Operating and indicating elements
4.1. Elements on the basic machine / table support
No. Denomination Function
7 Tightening nut - Tightening of the pipes
8 Upper guide bar - Guidance for the slide
9 Scale - Display of the applied welding force
- max. 60 kp displayed
10 Handwheel - Opening / closing the slides
- application of the adjusting force
11 Star grip for basic machine - Attaching the basic machine at the table
support.
12 Spindle - Advance of the slide
13 Lower guide bar - Guidance for the slide
- Fixing the planer
- Rest for the heating element
14 Hexagon screw (4x) - Setting the angle
13
12
11
10
9
8
7
14

Kunststoffschweißtechnik
Operating and Indicating Elements Chapter 4
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 15 of 42
4.2. Elements at heating element and planer
No. Denomination Function
17 On- / off – switch for
heating element
- “ON”, the control lamp illuminates
- “OFF”, the control lamp extinguishes
18 Knob with slot - Setting the temperature for the heating element
19 Control lamp green - There are three different states:
Out: signalizes that the heating element is not heated up at
the moment or that it cools down
Blinking: the temperature of the heating element is
maintained by a pulse-position ratio.
On: signalizes that the heating element is heated up at the
moment and has not yet reached the desired temperature.
20 Ratchet - Turning around the planer
21 Star grip screw and tin
disc
- Attaching the planer at the guidance bar by turning the
screw and tin disc
20
18
17
21
19

Kunststoffschweißtechnik
Operating and Indicating Elements Chapter 4
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 16 of 42
4.3. Elements at the electric planer (optional)
No. Name Function
22 Button on/off The button must be pushed for planing.
The planer has to be switched off after each planing
process
23 Locking knob Keeps the on/off button in position: ON
24 Star grip screw and tin disc - Attaching the planer at the guidance bar by turning the
screw and tin disc
Be especially cautions, there ist the danger of cuttings!
Only activate the planer if it has been placed into the machine and secured by
locking tin disc and star grip screw.
22
23
24

Kunststoffschweißtechnik
WIDOS Einsteinstr. 5 Phone ++49 (0)7152 / 9939 - 0
W. Dommer Söhne GmbH D-71254 Ditzingen-Heimerdingen Fax ++49 (0)7152 / 9939 - 40
http://www.widos.de email: [e-mail]
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 17 of 42
5. Starting and operating
The instructions of this chapter are supposed to initiate in the operation of the machine and
lead during the appropriate starting of the machine.
This includes
the safe operation of the machine
using all the possible options of the machine
economic operation of the machine
5.1. Starting
The machine may only be operated by initiated and authorized persons.
For the qualification, a plastic welding exam can be taken according to DVS and
DVGW.
In situations of danger for persons and the machine, the mains plug has to be unplugged
immediately.
After completion of the welding work and during breaks the machine has to be switched off.
Further take care that no unauthorized person has access.
Protect the machine from wetness and humidity.
According to VDE 0100, the use on construction sites is only allowed with a power
distributor with a FI-security protective switch.
Connect the heating element and the electric planer (optional) to the mains supply (230 V / 50
Hz).
Lay electric cables carefully (danger of stumbling) !
Take into account the surrounding conditions:
The welding may not be performed under direct sun rays influence, use a welding
umbrella if necessary.
If the surrounding temperature is under 5° C, measures have to be taken:
Use a welding tent or preheat the pipe ends if necessary.
In addition, take measures against rain, wind and dust.

Kunststoffschweißtechnik
Starting and Operating Chapter 5
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 18 of 42
5.1.1 Exchanging the reduction Inserts
Unscrew the mounted reduction inserts by means of the provided Allan key.
Screw the reduction inserts with the corresponding diameter into the clamping devices.
When welding bends, the angle can be set on the basic clamping devices (on each side
between -15° to +15°).
If necessary (e.g. for T-pieces) a special basic clamping device can be provided by means
of which very short sections can be clamped.
Large clamping device Small clamping device
(Fitting clamping device)
5.2. Welding process
The respectively valid welding prescriptions (ISO / CEN / DVS ...) are
to be basically followed.
Do wear safety gloves as protection against burning.
A stop-watch must be available for recording the actual times for heating up and cooling.
A welding table must be available from which the parameters for the pipe dimensions to be
welded prescribed by the welding prescriptions may be taken.
The heating element surfaces must be clean and especially non greasy. Therefore they
need to be cleaned shortly before each welding or in case of dirtiness by means of a fibre-
free paper and a cleaning agent (e.g. PE cleaner or WIDOS pipe cleaning tissues).
The anti-adhesive coating of the heating element must remain undamaged in the working
area.

Kunststoffschweißtechnik
Starting and Operating Chapter 5
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 19 of 42
Switch on heating element and set the required welding temperature (standard value
PE-HD: 210° C) on the adjustment screw on the handle.
As soon as the control light blinks, the nominal temperature has been reached and is
maintained at a constant level by a pulse-position ratio.
Screw in reduction inserts according to the outer diameter of the pipes to be welded, if
necessary set the angle.
Attach the basic frame at the table support, if required fix the table support at the support
surface or insert machine without table support directly into the pipe system.
Machine working directly in the pipe system
Put the workpieces into the clamping device, fasten clamping nuts tightly and align the
workpieces with respect to one another.
Insert the manual planer between the ends of the workpieces, lock it by turning the star grip
on the guide bar and plane with low force.
Insert the electric planer (optional) between the ends of the workpieces, lock it by turning
the star grip at the guide rod. Switch on planer at the on/off button and keep it switched on
with the locking knob. Plane the pipes with low force. For releasing the locking knob, push
shortly the button.
Planing should be carried out until a revolving cutting has been formed on both sides.
Open slide again, remove the planer and put it into the reception box. Remove the
produced cuttings without contacting the worked surfaces.
Close slide again.
Check pipe mismatch and gap on the joining pipe ends.
According to DVS 2207, the mismatch on the pipe outer side must not exceed 0.1 x pipe
wall thickness, the admissible gap must not exceed 0.5 mm.
The mismatch compensation is carried out by further tightening or releasing the clamping
nuts. In case mismatch compensation was carried out, planing must be repeated
afterwards.
The adjustment force for the pipe dimension to be welded can be gathered from the welding
table. Add the movement force.
Open slide again somewhat.
Gather heating time, maximum change over time, cooling time and bead height for the pipe
dimension to be welded from the table.

Kunststoffschweißtechnik
Starting and Operating Chapter 5
14.04.14 Working Instructions WIDOS MINIPLAST 2 Page 20 of 42
Move the heating element which has been cleaned and brought to desired temperature
between the pipes with the handle facing downwards (hang into guide bar).
Close the slide smoothly with the determined adjustment force.
The applied force can be read at the force scale on the handwheel.
When the prescribed revolving bead height is reached, reduce the force (heating force =
approx. 10 % of the adjustment force).
The heating time starts now. Press the stop-watch and compare the actual time with the
nominal time taken from the table.
After expiration of the heating time, open the slide, remove the heating element as quickly
as possible, put it into the heat protection box and close the slide smoothly.
The maximum time frame for this process is predetermined by the value for the change over
time taken from the table.
Press the stop-watch when the welding pressure is built up.
If necessary, readjust the force during cooling (the force for cooling is the same as the
adjustment pressure).
After expiration of the cooling time, release the force, remove the welded part and open the
slide.