ELETTROLASER MS 3.5 User manual

User and maintenance manual
Translation of the original instructions
Laser Welding machine
Serial MS 3.5
Model
MS 3.5
Serial numbers All
Year of manufacture 2022
Manual code UMS012
Review / date 0.2 / 20/04/2022
ELETTROLASER S.R.L. | Via dell’Industria, 35 - 37060 Sona (VR) Italy |[phone] | [e-mail] | www.elettrolaser.com

All rights reserved. No part of this publication can be reproduced or distributed with any means, without the written consent of ELETTROLASER S.R.L..

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1General index
Tittle Page
1General index ................................................................................................................ 3
2Warranty and liability .................................................................................................... 4
3Use of the manual.......................................................................................................... 6
4General instructions...................................................................................................... 9
5Characteristics and technical data ................................................................................ 25
6Transport and installation............................................................................................ 34
7Operation.................................................................................................................... 43
8Operation instructions ................................................................................................. 66
9Maintenance ............................................................................................................... 86
10 Storage conditions of the machine ............................................................................... 93
11 Disassembly of the machine......................................................................................... 94
12 Support service............................................................................................................ 96
13 Summary and index of figures...................................................................................... 97
Annexes
A1 Copy of EC Declaration of conformity
A2 Delivery record for the safety keys of the machine

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2Warrantyandliability
2.1 Warranty
This Warranty covers the product it accompanies at the time of purchase.
This Warranty guarantees the product against any material or manufacturing faults for a period of THREE YEARS from the original
date of purchase.
Should any material or manufacturing defects be found during the warranty period, we will provide to repair or replace (at our
discretion) the product or its defective components according to the terms and conditions listed below, free of any charges for labor
costs or spare parts. Our support service reserves the right to replace defective products or their components with new or overhauled
products or parts. All replaced products and components will become property of ELETTROLASER S.R.L..
2.2 Conditions
Repairs under warranty will be performed only if the defective product is presented within the warranty period, along with the
original sale invoice or a purchase receipt (indicating the date of purchase, the type of product and the name of the dealer).
ELETTROLASER S.R.L. reserves the right to refuse repairs under warranty in the absence of the aforementioned documents or if the
information they feature is incomplete or illegible. This Warranty will cease to apply if the indication of the model or serial number
on the product have been changed, cancelled, removed or have become illegible.
This Warranty does not cover the costs and risks involved in transporting your product to our FACILITIES.
The following are excluded from this Warranty:
•Periodic maintenance operations and repairs or replacements of parts due to wear and tear;
•Consumption materials (components which foreseeably require periodic replacing during the lifespan of a product, such as tools,
lubricants, filters, etc.).
•Damage or faults due to incorrect operating, use or treatment of the product, for different purposes than normal professional
use;
•Damage or modifications to the product caused by incorrect use, including:
▪Treatments that cause physical, aesthetic or superficial damage or alterations;
▪Incorrect installation or use of the product for different purposes than those it is designed for, or failure to observe
instructions for its installation and use;
▪Incorrect maintenance of the product, non-compliant with instructions for its correct maintenance;
▪Installation or any use of the product that is not in compliance with technical and safety laws of the Country where the
product is installed or used;
▪Conditions or defects in the systems the product is connected to or in which it is incorporated;
▪Repairs or attempted repairs by unauthorized staff;
▪Adjustments or changes to the product carried out without prior written authorization from the manufacturer, update of
the machinery exceeding the technical specifications and functions described in the instructions manual, or changes made
to the product to make it compliant with different national or local technical or safety laws than those for which the product
was specifically designed and built;
▪Negligence;
▪Accidents, fires, liquids, chemical substances or other types of substances, flooding, vibrations, overheating, inadequate
ventilation, excessive or incorrect electrical supply, radiations, electrostatic discharge, including lightning and other
external forces or sources of impact.
2.3 Exclusions and restrictions
With the exception of the above, ELETTROLASER S.R.L. does not release any warranty (explicit, implicit, statutory or of any other
nature) for the product in terms of quality, performance levels, precision, reliability, suitability for specific uses or other aspects.
If this exclusion not admissible, fully or partially, on the basis of currently applicable laws, ELETTROLASER S.R.L. excludes or restricts
its warranties to the maximum limit allowed by applicable laws.
Any warranty that cannot be fully excluded will be restricted (according to terms allowed by applicable laws) to the duration of the
present Warranty.
The only obligation held by ELETTROLASER S.R.L. in the framework of this Warranty consists of repairs or replacements of products
based on the present warranty terms and conditions. ELETTROLASER S.R.L. declines any liability for losses or damage concerning
products, services, the present Warranty or other aspects, including economic or intangible losses –the price paid for the product –
loss of profits, income, data, employment or use of the product or of other associated products –indirect, incidental or consequential
losses or damage. This is also valid for losses and damage deriving from:

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•Compromised functioning or breakdowns of the product or of associated products due to defects or lack of availability while
under assessment in the facilities of Elettrolaser or other authorized support centers, with consequent downtime, loss of
production time or interruptions in operations;
•Imperfect performances of the product or associated products.
This is also valid for losses and damage in the context of any legal theories, including negligence and other illegal acts, contractual
violations, explicit or implicit warranties and strict liability (including cases in which ELETTROLASER S.R.L. or the support center have
been warned of the possibility of such damage occurring).
If currently applicable laws prohibit or restrict these liability exemptions, ELETTROLASER S.R.L. excludes or restricts its liability to the
maximum limit allowed by applicable laws.
Some nations, for example, prohibit the exclusion or restriction of damage due to negligence, grave negligence, intentional non-
compliance, fraud and similar acts. In the framework of this Warranty, in no event will the liability held by ELETTROLASER S.R.L. be
greater than the price paid for the product, notwithstanding that if applicable laws require higher liability limits, these limits will be
applied in compliance with the law.
2.4 Reserved legal rights
Applicable national laws grant (statutory) legal rights to purchasers in the context of consumer product sales.
This Warranty does not affect purchaser rights set by currently effective laws, nor rights that cannot be excluded or restricted, nor
the client’s rights in relation to the dealer. The client will decide, at his sole discretion, whether to enforce the rights he is entitled to.
2.5 Seals
Seals are present in specific points of the welding machine. These seals must not be broken or removed for any reason. The seals
parts can be opened only and exclusively by ELETTROLASER S.R.L. or by the authorized support center.
INFORMATION!: Breaking or removal of the seals placed by the manufacturer on the welding machine will result in immediate
forfeit of the warranty.
WARNING!: Only authorized, qualified and trained personnel is allowed to access internal parts of the machine.

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3Useof the manual
This manual was prepared by the Manufacturer and is an integral part of the supply of the machinery.
The information featured in the MS 3.5, manual addresses the staff in charge of operating and maintaining the machine.
The manual offers information that all qualified staff must mandatorily be familiar with, and which allows for use of the machine in
safe conditions.
OBLIGATION!: All relevant staff, as a result of its tasks and responsibilities, must read and understand the contents of this manual
before installing, using or performing any other operation on the machine!
3.1.1 Definitions
•Safety component: a component or device used to ensure safety functions; failures or malfunctions of these components can
jeopardize the health and/or safety of exposed persons (e.g. fixed and mobile guards, electronic safety devices, etc.);
•Protection device: device (other than guards) designed to reduce risks, either by itself or in combination with guards;
•Operator: individual(s) in charge of installing, running, regulating, cleaning, repairing or moving a machine or in charge of its
maintenance;
•Hazard: a potential source of injuries or harm;
•Exposed person: any person located fully or partially within a hazardous area;
•Guard: element of the machine used specifically to ensure protection via a material barrier;
•Risk: combination of the probability and gravity of injuries or harm caused by a hazardous situation;
•Residual risk: risk that remains after the implementation of protection measures;
•Expected use: use of the machinery compliant with information provided in the instructions for use;
•Reasonably foreseeable incorrect use: different use of the machine than that indicated in the instructions for use, but deriving
from easily predictable human behavior;
•Hazardous area: any area inside and/or near the machine in which the presence of a person constitutes a risk for his/her health
and safety.

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3.2 Structure of the manual
3.2.1 Division of the manual
This manual is divided into chapters. Each chapter may in turn be divided into paragraphs. The lower external margin of each page
indicates the page number and the total number of pages in the manual.
A general summary is included at the end of the manual for quick consultation.
3.2.2 Illustrations and tables
Illustrations and tables are normally included within the text. When this is not possible, they are linked to the page and listed as a
connected illustration or table. All tables and illustrations are numbered and feature a caption (Tab. 2.2-1, Fig. 2.2-1, etc.).
3.2.3 Annexes
We intend as annexes all technical documents that are an integral part of the user and maintenance manual, such as electrical and
pneumatic diagrams, declarations of conformity for components, technical specification sheets, etc. These documents are included
at the end of the manual (after the summary and the illustrations index).
3.3 Units of measurement
The following units of measurement have been used in this manual, as defined by the International System (S.I.), under the ISO
80000-1 standard. The units of measurement normally used in this manual are:
•Linear dimensions –The chosen unit of measurement for length is the meter, symbol [m], or its submultiples (centimeters and
millimeters, i.e. [cm] and [mm]). The inch is used in some cases;
•Time - The chosen unit of measurement for time is the second [s]. When convenient, the manual may also use minutes [min]
and/or hours [h];
•Mass - The chosen unit of measurement for time is the kilogram [kg]. When convenient, the manual may also use grams [g];
•Electric current intensity –Electric current intensity is measured in Ampere [A];
•Thermodynamic temperature –According to the SI system, the essential unit of measurement for thermodynamic temperature
is the Kelvin degree [K]. The temperature unit generally used in this manual is the Celsius degree [°C]. The temperature will be
left in Fahrenheit degrees [°F] only when specific sections refer to parts for which the manufacturer is supplying technical
specifications;
•Light intensity –Light intensity per surface unit is measured in [lux];
•Plane angle –Based on international standards, plane angles are measured in radians [rad]. This manual uses sexagesimal
degrees, according to the ratio: 360° = 2p [rad].
3.3.1 Derived units
Derived units of measurement are all based on the essential units described above. In addition to units derived from essential metric
units, some essential Anglo-Saxon units and their derived units may be used in certain parts of the manual.

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3.4 Conservation of the manual
3.4.1 How to conserve the manual
This manual, the original copy of the declaration of conformity and all the technical annexes must be stored with care for the entire
lifespan of the machine, including the disassembly phase.
3.4.2 Where to store the manual
The manual should be kept in a dry place near the machine and must in any case always be available for consultation by the staff in
charge of running and monitoring the machine.
3.4.3 How to reproduce the manual
This manual can be photocopied only from the original copy, given that photocopies made from other copies will decrease the clarity
of the images and therefore of the information.
PROHIBITION!: Reproducing this manual is permitted only for the purpose of making a spare copy.
In compliance with the law, ELETTROLASER S.R.L. reserves ownership of this manual, prohibiting its transfer to third parties
and/or its unauthorized reproduction.
3.4.4 What to do in the event of loss or damage
If this manual is damaged or lost, the Client can ask for a certified copy. When forwarding the request, please indicate the code and
version of the manual. This data can be found at the top of each page (Fig. 3-1).
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Fig. 3-1 - Manual ID data
3.4.5 What to do if ownership of the machine is transferred
If the machine is sold to a third party, the manual must be delivered to the new owner.
3.4.6 What to do in the event of changes to the machine
Before making any changes to the machine, contact the manufacturer or the dealer in order to receive the necessary clarifications
on feasibility of the operations without altering the machine characteristics or safety conditions.
If substantial changes are made to the machine or its control units, the machine certification and consequently this manual will no
longer be considered valid.

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4Generalinstructions
4.1 Working in safe conditions
Safety instructions included in the user and maintenance manual refer to operations which can be performed on the machine.
Safety symbols are included in the text to highlight items which require particular attention. It is essential that these safety
instructions be observed at all times. Failure to observe the instructions may cause injuries to persons and/or damage to machinery
or to other equipment.
Keeping this in mind, please find below a series of key safety instructions:
•Read and learn this section of the safety instructions before installing, using, maintaining or repairing the machine;
•Read and follow the safety signs included in the text and referring to specific operations;
•When required, wear personal protective equipment (P.P.E.) such as protective glasses, safety gloves and shoes;
•Know and observe the safety instructions provided by ELETTROLASER S.R.L., as well as general standards for prevention of
injuries and safety laws.
4.2 Safety signs
When pertinent, the symbols illustrated below are used in this user and maintenance manual. These symbols were inserted to warn
the staff of hazards or potential sources of danger. Learn their meaning.
Failure to pay attention to these symbols may cause personal injuries, death and/or damage to the machine or to equipment.
There are generally three types of signs (Tab. 4-1):
Symbol
Shape
Type
Description
Framed triangle
Hazard signs
Indicate instructions concerning
present or potential hazards
Barred circle frame
Prohibition signs
Indicate instructions concerning
actions that must be avoided
Full circle
Obligation signs
Indicate information the staff must
read and observe
Circle frame
Information
Indicate useful information,
different than the hazard /
prohibition / obligation type
Tab. 4-1 –Type of safety signage
According to the information they intend to transmit, the signs may feature a series of symbols to help understand the type of hazard,
prohibition or obligation they refer to, via an association of ideas.

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4.3 Symbols used
The following symbols are used in this manual.
These symbols have been included to help understand performed / described activities; they are generally featured in paragraphs
7.4 and 7.5 and in chapters 8 and 9.
Symbol
Description
Indicates the use of control devices.
May be accompanied by text (e.g.: ON/OFF, Start/Stop), indications on the rotation direction, etc.
Indicates locking/unlocking, opening/closing, screwing/loosening actions to be performed with specific tools (e.g.
wrenches, screwdrivers).
Indicates operations concerning the tools (assembly, disassembly, replacement).
Indicates measuring or detection operations (product dimensions, positioning of guides or clamps).
Indicates regulation operations.
Indicates the need to perform checks.
Indicates lubrication operations.
Tab. 4-2 –Symbols used

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4.3.1 Hazard signs
Generic hazard
This sign is used to highlight hazardous situations which may cause damage to persons, animals and things. Failure
to observe instructions associated with this sign can cause danger.
Hazard due to the presence of voltage
This sign is used to highlight the danger of electrocution due to direct or indirect contact with live parts of the
machine. Failure to observe instructions associated with this sign can cause serious injuries to persons or even their
death.
Hazard due to laser radiation
This sign is used to highlight the danger deriving from the presence of sources of artificial optical radiation. Failure
to observe instructions associated with this sign can cause the risk of damage to sight.
Danger of burns
This sign is used to highlight the danger of burns due to contact with hot surfaces (˃ 60 °C). Failure to observe
instructions associated with this sign can cause the risk of burns to the hands or upper limbs.
Danger of explosion
This sign is used to highlight the danger of explosion. Failure to observe instructions associated with this sign can
cause explosions.
Danger of fire
This sign is used to highlight the danger of fire. Failure to observe instructions associated with this sign can cause
fires.
Danger of death
This sign is used to highlight situations of grave danger which may cause serious injuries or even death. Failure to
observe instructions associated with this sign can cause serious injuries to persons or their death.

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4.3.2 Prohibition signs
Generic prohibition
This sign is used to highlight that certain maneuvers, operations or forms of behavior are not permitted. Failure to
observe instructions associated with this sign can cause damage to things, animals, persons.
No touching
This sign is used to highlight that the operator is not permitted to touch specific parts of the machine. Failure to
observe instructions associated with this sign may cause hand injuries.
No introducing hands
This sign is used to highlight that the operator is not permitted to introduce his/her hands in specific areas. Failure
to observe instructions associated with this sign may cause injuries to the hands and upper limbs.
No smoking and no use of naked flames
This sign is used to highlight that smoking and/or the use of naked flames are not permitted. Failure to observe
instructions associated with this sign may cause explosions and/or fires.
No extinguishing with water
This sign is used to highlight that flames and/or incipient fires must not be extinguished by using water. Failure to
observe instructions associated with this sign can cause damage to things, animals, persons.

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4.3.3 Obligation signs
Generic obligation
This sign is used to highlight that the operator must observe the specific instructions. Failure to observe instructions
associated with this sign can cause damage to things, animals, persons.
Mandatory use of specific P.P.E.
These signs are used to highlight the mandatory use of specific personal protective equipment during operations.
Failure to observe instructions associated with this sign can cause serious injuries or the death of the operator.
Mandatory grounding
This sign is used to highlight the mandatory connection of the machine to an efficient grounding system. Failure to
observe instructions associated with this sign can cause damage to things, animals, persons.
Mandatory disconnection of plug from socket
This sign is used to highlight the mandatory disconnection of the electrical supply plug before performing any
operations. Failure to observe instructions associated with this sign can cause damage to things, animals, persons.
Mandatory guard efficiency check
This sign is used to highlight a mandatory efficiency check of the guards (removed during maintenance, repairs,
cleaning or lubrication operations). Failure to observe instructions associated with this sign can cause damage to
things, animals, persons.
Obligation to read instructions
This sign is used to highlight the obligation to read instructions (the user and maintenance manual, technical
diagrams, etc.) before installing, using or performing any other operation on the machine!

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4.4 General information on classification of lasers
Classification of lasers follows this standard:
•CEI EN 60825-1: 2014 Safety of laser products Part 1: Classification of devices and requirements.
4.4.1 Hazard potential of laser classes
The concept of laser is insufficient to describe the hazard presented by a device emitting coherent electromagnetic radiation.
The risk potential can vary greatly according to the device in question and the conditions in which it is used. This is why international
laws recommend the assignment of a specific class to each laser system, in order for the danger potential to immediately be clear to
all. The higher the class number, the greater the risk level.
4.4.2 Classification obligation
Producers of laser devices can deliver a product to the user only after attributing it to one of the seven classes defined in the standard
on lasers (failure to assign a class would result in the user having to follow the strict rules set for class 4).
Class
Risks
Necessary measures
1
Harmless in normal operation conditions1.
No necessary measures.
1M
Harmless without optical tools.
Warn individuals using optical tools.
2
Harmless is exposure is temporary.
•Do not look directly at the laser ray;
•Do not direct the laser towards the face.
2M
Without optical tools: same as class 2.
Warn individuals using optical tools.
3A
Eliminated.
Treat the same as classes 1m or 2m.
3R
Moderately dangerous.
For use by qualified staff only.
3B2
•Direct rays are dangerous for the eyes;
•Scattered radiation is not dangerous.
•Appoint a head of laser safety;
•Delimit the area of use with architectonic elements;
•Control access to the area;
•Declare the presence of lasers at the entrance;
•Allow use by qualified staff only;
•Wear protective glasses if necessary.
4
•Rays are dangerous for the eyes and skin;
•Scattered radiation is potentially dangerous for the
eyes;
•Risk of fire.
•Same precautions as per class 3b;
•Use the necessary P.P.E.
Tab. 4-1 –Classification of lasers in compliance with standard CEI EN 60825-1:2014
Based on the active material and the pumping source, the laser can operate continuously (cw = continuous wave, with an emission
duration > 0,25 s), in pulsed mode or in repetitive pulsed mode, or can emanate its energy in the form of a single giant pulse.
4.5 Effects of laser radiation on biological tissues
4.5.1 General information
The mechanism by which laser radiation causes damage is similar for all biological systems and can lead to heat interactions,
transitory thermoacoustic events, photochemical processes and non-linear effects.
In the event of damage, the level of responsibility of each of these mechanisms can be referred to certain physical parameters of the
radiation source, the most relevant of which are the wavelength, the duration of the pulse, the dimensions of the image, the
irradiance and the radiant exposure.
1
In normal conditions of use, class 1 lasers must be safe even in the absence of specific instructions.
2
If safety depends on imparted instructions, the lack of danger involved in using the device should not be indicated as class 1, but
with a declaration of the following kind: “No hazards in the marked area”.

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In general, in the case of exposures exceeding the threshold, the predominant mechanism mainly depends on the duration of the
exposure pulse.
Thus, following an ascending order of duration of the pulse, the predominant effects in the following time intervals are:
•For exposures lasting nanoseconds and lower than one nanosecond, micro-cavitation, transitory acoustic events and non-linear
effects;
•Between 100 μs and a few seconds, thermal effects;
•Above approximately 10 seconds, photochemical effects.
Laser radiation differs from all other known types of radiation due to its high radiance and collimation of the beam.
This fact, together with the high initial energy content, results in the transmission of noteworthy quantities of energy towards
biological tissues.
The main event in any type of damage caused by laser radiation to a biological system is the absorption of optical radiation by the
system in question. This absorption occurs on the atomic or molecular level and represents a specific process of the wavelength.
Thus, the wavelength determines which tissue may be damaged by a specific laser beam.
Fig. 4-1 –Examples of absorption of laser radiation based on time of exposure and dimensions of the beam
Key:
a) Laser energy absorbed by the system.
b) The absorbed energy generates heat which is
transmitted to surrounding tissues.
c) In the case of long pulsed or continuous wave
lasers, the persistence of the thermal front
causes a progressive widening of the lesion.
d) In the case of short pulsed lasers, the
noteworthy power density causes an
explosive rupture of the cells and movement-
induced injury.

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4.5.2 Hazards to the eyes
4.5.2.1 Physiology of the eye
Fig. 4-2 –Physiology of the human eye
Section (A) of Fig. 4-2 displays the external structure of a left eye.
The distance between the eyelids limits the field of vision (FOV) of the eye to an almond-shaped surface. The main elements of the
front part of an eye are also indicated.
Section (B) displays the horizontal section of a left eye. The eye is divided into two parts, the anterior or front chamber limited by the
cornea, iris and lens, and the posterior chamber limited by the retina, which contains the gelatinous-looking vitreous humor.
Section (C) displays the inside of an intact eye as observed through an ophthalmoscope. This tool directs a light beam through the
pupil and illuminates the inside of the eye, thus allowing for its observation. The image seen in this way is called back of the eye. It
appears reddish in color, but the main retina vessels are clearly distinguishable. The other main elements are the optic disc, whitish
in color, and the fovea. The fovea is a small depression of the retinal surface which may be more pigmented than the surrounding
retina and is the most distinguished area of vision. The fovea is the center of the macula; the macula is responsible for sharp vision.
Section (D) displays the structure of the retina as seen in the section of its surface shown in Fig. 4-2 (B), but enlarged a few hundred
times from its natural size. The retina consists of a series of nervous cell layers which cover the photosensitive cells: the cones and
rods; in other words, light arriving on the retinal surface must move through the nervous cell layers before reaching the
photosensitive cells. Beneath the layer of cones and rods is a layer known as pigment epithelium which contains a black-darkish
melanin pigment; under this is a thin layer of blood vessels, the choriocapillaris. The last absorbent layer is the choroid, which contains
both pigment cells and blood vessels.
Section (E) displays the structure of the fovea region, enlarged a few hundred times from its natural size. This area only features
cones. The nervous cells are located radially towards the external part of this area of sharper vision. The macular pigment, which
mainly absorbs wavelengths between 400 nm and 500 nm, is located in Henle’s fiber layer.
Eyelid
Sclera
(white part
of eye)
Aqueous
humour
Lens
Conjunctiva
Optic nerve
output
Receptor cells
(rods and cones
Choroid
Coroide
Choroid
Receptor cells
(cones)
Eyebrows
Eyelashe
Iris
(Coloured
part of eye)
Pupil
(black area)
Retinal vein
Optic disc
Retinal artery
Vitreous
humour
Cornea
(transparent front part
of eye)
Fovea
Pigment
epithelium
Sclera
Retina
Sclera
Light
Light
Blood vessels

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4.5.3 Pathological effects of laser radiation
4.5.3.1 Hazards to the eyes
Fig. 4-2 features a brief description of the anatomy of the eye. The eye is particularly well-suited to receiving and transmitting optical
radiation.
Associated pathologies due to excessive exposures are summarized in Tab. 4-2, below. Lasers emitting radiation in the ultraviolet
and far infrared represent a hazard for the cornea, while radiation from systems emitting at wavelengths in the visible and near
infrared is transmitted to the retina.
Spectral region3
Pathological effects on the eyes
Pathological effects on the skin
Ultraviolet C
(180 nm to 280 nm)
Photokeratitis.
•Erythema (sunburn);
•Acceleration of skin ageing process;
•Increased pigmentation.
Ultraviolet B
(280 nm to 315 nm)
Ultraviolet A
(315 nm to 400 nm)
Photochemical cataract.
•Darkening of pigment;
•Photosensitive reactions;
•Burnt skin.
Visible
(400nm to 780 nm)
Photochemical and thermal lesion to the
Retina.
Infrared A
(780 nm to 1 400 nm)
Cataract, burnt retina.
Burnt skin.
Infrared B
(1,4m to 3,0 m)
Inflammation of aqueous humor, cataract,
burnt cornea.
Infrared C
(3,0m to 1 mm)
Burnt cornea.
Tab. 4-2 –Pathological effects of lasers in relation to spectral region
Lasers visible in the near infrared represent a special danger for the eye, specifically because the necessary properties for the eye
to be an effective light transducer subject highly pigmented tissues to high radiant exposure.
Lasers outside the specter of visible light are particularly hazardous as there is no optical perception of the beam and the protection
deriving from palpebral reflexes is absent.
4.5.3.2 Hazards to the skin
In general, skin can withstand a much higher exposure to the energy of a laser beam then the eye.
The biological effect of skin irradiation with lasers operating in the spectral regions of the visible (from 400 nm to 700 nm) and of the
infrared (greater than 700 nm) can vary from a slight erythema to large blisters.
Ash-colored carbonization is prevalent in tissues with high superficial absorption levels following exposure to short pulsed lasers with
high peak power. This may not be followed by an erythema.
Pigmentation, ulceration, the appearance of skin scars and damage to underlying organs may be caused by extremely high irradiation.
It has been established that latent or cumulative effects of laser radiation are not frequent.
However, some limited studies have suggested that, in particular conditions, repeated local exposures may sensitize small areas of
human tissue, causing changes to the levels of exposure behind minimal reactions and a worsening of tissue reactions to low levels
of exposure.
Studies concerning biological thresholds indicate that, with wavelengths between 1500 nm and 2600 nm, the risk of skin lesions
follows a similar pattern to that of the eye. The EMP increases within this spectral region for exposures with a duration of up to 10s.
3
Spectral regions defined by the CIE are only synthetic annotations used to describe biological effects, and may not correspond
exactly to the spectral intervals indicated in the CEI EN 60825-1 standard.

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Laser Welding machine - MS 3.5
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4.6 Classification and specific hazards of radiation emitted by MS 3.5
Based on the CEI EN 60825-1: 2014 standard, MS 3.5 is classified as indicated in the following Tab. 4-3:
Parameter
Value
Laser class
LASER Class 4
Wavelength
1064 nm
Type of emission
Pulsed, non-repetitive, non-
continued
Pulse duration
MS 3.5:
From 0,1 to12 ms
Divergence of the laser beam (in the output window located on the optical channel)
Between 0,5 and 6 Hz
Laser class
7,153°
Maximum emitted power or energy
MS 3.5:
3 kW / 35 J
Tab. 4-3 –MS 3.5 classification according to CEI EN 60825-1:2014
WARNING!: Class 4 lasers are laser products in relation to which direct viewing of the beam and skin exposure are hazardous and
in which the viewing of diffuse reflections can also be dangerous. These lasers often also represent a fire hazard.
This laser emits a radiation in the non-visible specter and is therefore particularly dangerous, as it is not perceivable by the human
eye.
Furthermore, non-visible laser radiation decreases the (natural) protective effect of palpebral reflexes4.
•D.N.R.O
5
for direct or specularly reflected radiation: 15 m;
•D.N.R.O for diffuse radiation: 0,5 m.
WARNING!: Only the use of personal protective equipment can protect the operator from the effects of laser radiation.
OBLIGATION: The Employer must mandatorily assess the risks deriving from exposure and choose to make adequate personal
protective equipment available to the workers.
4
The eyelid closes due to the reflected effect of glare.
5
Nominal Optical Risk Distance.

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4.7 Graphic signs and written warnings
Please find below the graphic signs and written warnings located on the machine. These signs were inserted to make the operator
aware of hazards or residual potential sources of danger. An explanatory comment can be found next to each exclusively graphic
sign. Make sure you learn the meaning of these signs.
For information on the position of these signs, please refer to paragraph 4.7.4.
WARNING!: Failure to understand or pay attention to the meaning of signs and warnings can cause personal injuries, death and/or
damage to the machinery or to equipment.
4.7.1 Hazard graphic signs and written warnings
Fig. 4-3 –Hazard pictogram
This sign (featuring indications of the correspondent voltage
value) highlights the hazard (residual risk) due to the presence
of voltage.
Fig. 4-4 –Hazard pictogram
This sign highlights the hazard (residual risk) associated with
exposure of the eyes and skin to direct or diffuse radiation.
Fig. 4-5 –Hazard pictogram
This sign highlights the hazard (residual risk) associated with
laser radiation in proximity to an opening (in the welding
chamber).
Fig. 4-6 –Explanatory label
This sign highlights the hazard (residual risk) associated with
laser radiation reflected through the blind.

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Fig. 4-7 –Warning label
This sign highlights the hazard (residual risk) associated with
exposure of the eyes and skin to direct or diffuse radiation, and
furthermore provides information on the characteristics of the
laser source.
4.7.2 Obligation graphic signs and written warnings
Fig. 4-8 –Obligation pictogram
This sign highlights that the operator has an obligation to read
and understand the manual before using the machine.
Failure to observe instructions can cause death or serious
injuries.
4.7.3 Other graphic signs and written warnings
Fig. 4-9 –Conformity pictogram
This sign highlights the manufacturers’ conformity to FDA6
performance standards for laser products.
6
Food and Drug Administration.