kSIST FprEN ISO 16321-2:2020

Eye and face protection for occupational use - Part 2: Additional requirements for protectors used during welding and related techniques (ISO/FDIS 16321-2:2020)

This document specifies additional requirements for eye and face protectors designed to provide protection
for the eyes and faces of persons against occupational hazards during welding and allied processes, such as
optical radiation, impacts from flying particles and fragments, and hot solids.
This document also applies to those articles of eye- and face-protection used for occupational-type tasks but
not performed as part of an occupation, e.g. "do-it-yourself".
This document specifies materials, design, performance requirements, and marking requirements for
welding protectors which are different from and/or supplement ISO 16321-1.

Augen- und Gesichtsschutz für betriebliche Anwendungen - Teil 2: Zusätzliche Anforderungen an Schutzgeräte die während des Schweißens und verwandten Verfahren verwendet werden (ISO/DIS 16321-2:2018)

Dieses Dokument legt zusätzliche Anforderungen an die Werkstoffe, das Design, die Leistung und die Kennzeichnung von Augen- und Gesichtsschutzgeräten fest, die so ausgelegt sind, dass sie Augen und Gesicht von Personen vor beruflichen Gefährdungen schützen, die beim Schweißen und verwandten Verfahren auftreten, wie z. B. optische Strahlung, herumfliegende Partikel und Bruchstücke und heiße Festkörper. Die anderen geltenden Anforderungen an Schweißerschutzgeräte sind in ISO 16321-1 enthalten.
Dieses Dokument gilt auch für Schweißerschutzgeräte, die in Bildungseinrichtungen angewendet werden.
Dieses Dokument gilt auch für diejenigen Augen- und Gesichtsschutzgeräte, die bei der Ausübung von Aufgaben des beruflichen Typs, z. B. Heimwerken, angewendet werden, die ähnlich einem Beruf ausgeführt werden.

Protection des yeux et du visage à usage professionnel - Partie 2: Exigences complémentaires relatives aux protecteurs utilisés pour le soudage et les techniques connexes (ISO/DIS 16321-2:2018)

Zaščita za oči in obraz za poklicno uporabo - 2. del: Dodatne zahteve za ščitnike, ki se uporabljajo pri varjenju in sorodnih tehnikah (ISO/FDIS 16321-2:2020)

General Information

• Status: Not Published
• Public Enquiry End Date: 19-Jul-2018
• ICS: 13.340.20 - Head protective equipment
• Technical Committee: OVP - Personal protecting equipment
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 01-Oct-2020
• Due Date: 19-Nov-2020
• Completion Date: 13-Oct-2020
• Directive: 2016/425 - Regulation (EU) 2016/425 of the European Parliament and of the Council of 9 March 2016 on personal protective equipment and repealing Council Directive 89/686/EEC
• Ref Project: FprEN ISO 16321-2 - Eye and face protection for occupational use - Part 2: Additional requirements for protectors used during welding and related techniques (ISO/FDIS 16321-2:2020)

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 16321-2:2018
01-julij-2018

=DãþLWD]DRþLLQREUD]]DSRNOLFQRXSRUDERGHO'RGDWQH]DKWHYH]DãþLWQLNHNL

VHXSRUDEOMDMRSULYDUMHQMXLQVRURGQLKWHKQLNDK,62',6

Eye and face protection for occupational use - Part 2: Additional requirements for

protectors used during welding and related techniques (ISO/DIS 16321-2:2018)
Augen- und Gesichtsschutz für betriebliche Anwendungen - Teil 2: Zusätzliche
Anforderungen an Schutzgeräte die während des Schweißens und verwandten
Verfahren verwendet werden (ISO/DIS 16321-2:2018)
Protection des yeux et du visage à usage professionnel - Partie 2: Exigences

complémentaires relatives aux protecteurs utilisés pour le soudage et les techniques

connexes (ISO/DIS 16321-2:2018)
Ta slovenski standard je istoveten z: prEN ISO 16321-2
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
oSIST prEN ISO 16321-2:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 16321-2:2018
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oSIST prEN ISO 16321-2:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16321-2
ISO/TC 94/SC 6 Secretariat: BSI
Voting begins on: Voting terminates on:
2018-05-18 2018-08-10
Eye and face protection for occupational use —
Part 2:
Additional requirements for protectors used during
welding and related techniques
Protection des yeux et du visage pour les loisirs —

Partie 2: Exigences complémentaires relatives aux protecteurs utilisés pour le soudage et les techniques

connexes
ICS: 13.340.20
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 16321-2:2018(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
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Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Requirements .......................................................................................................................................................................................................... 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Headforms ................................................................................................................................................................................................... 2

4.3 Field of view .............................................................................................................................................................................................. 2

4.4 Physical optical requirements for welding filters ..................................................................................................... 3

4.4.1 General...................................................................................................................................................................................... 3

4.4.2 Transmittance requirements and scale numbers................................................................................ 3

4.4.3 Narrow angle scatter (reduced luminance coefficient) .................. ................................................ 5

4.4.4 Minimum robustness for unmounted welding filters (Static Load Test) ........................ 5

4.4.5 Resistance to ultraviolet radiation ................................................................................................................... 5

4.5 Automatic welding filters ............................................................................................................................................................... 6

4.5.1 General...................................................................................................................................................................................... 6

4.5.2 Transmittance requirements ................................................................................................................................ 6

4.5.3 Luminous transmittance variation over time for automatic welding filters ................ 7

4.5.4 Variation in luminous transmittance for automatic welding filters .................................... 8

4.5.5 Switching time and holding time of automatic welding filters ................................................ 9

4.5.6 Manual control of dark shade number ......................................................................................................... 9

4.5.7 Resistance to thermal exposure .................. .....................................................................................................10

4.5.8 Optical sensitivity of welding detection of automatic welding filters

(Optional requirement) ..........................................................................................................................................10

4.6 Resistance to surface damage due to fine flying particles (Optional requirement) .................10

5 Requirements for welding helmets, welding hand shields, welding frames and

welding mountings ..........................................................................................................................................................................................10

5.1 Optical requirements ......................................................................................................................................................................10

5.1.1 Frame transmittance .................................................................................................................................................10

5.1.2 Luminous reflectance of welding helmets and welding hand shields ............................11

5.2 Physical and mechanical requirements ..........................................................................................................................11

5.2.1 Area to be protected for welding helmets ...............................................................................................11

5.2.2 Light tightness of welding protectors .........................................................................................................11

5.2.3 Drop robustness for welding protectors ..................................................................................................11

5.2.4 Electrical insulation of welding helmets and welding hand shields ................................11

5.2.5 Resistance to penetration by hot solids of welding helmets and welding

hand shields ......................................................................................................................................................................11

5.2.6 Dimensions and mass of welding hand shields ..................................................................................12

6 Marking of welding protectors ...........................................................................................................................................................12

6.1 General ........................................................................................................................................................................................................12

6.2 Mandatory markings on welding filters .........................................................................................................................12

6.3 Mandatory markings on welding protectors except for welding filters .............................................12

6.4 Optional markings on welding filters ...............................................................................................................................13

6.5 Optional markings on welding protectors except for welding filters ...................................................13

6.6 Examples of markings ....................................................................................................................................................................13

7 Information to be supplied by the manufacturer ............................................................................................................14

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Regulation 2016/425 aimed to be covered ..............................................................................15

Bibliography .............................................................................................................................................................................................................................17

© ISO 2018 – All rights reserved iii
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.

The committee responsible for this document is ISO/TC 94, Personal safety - Protective clothing and

equipment, Subcommittee SC 6, Eye and face protection.

This document cancels and replaces the ISO 4850:1979 which has been technically revised.

A list of all parts in the ISO 16321- series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
Introduction

This family of documents was developed in response to the worldwide stakeholders' demand for

minimum requirements and test methods for eye and face protectors traded internationally. ISO 4007

gives the terms and definitions for all the various product types. The test methods are in the ISO 18526-

series, while the requirements for occupational eye and face protectors are in the ISO 16321- series.

Eye protection for specific sports is mostly dealt with by the ISO 18527- series. A guidance document

for the selection, use and maintenance of eye and face protectors is in preparation.

© ISO 2018 – All rights reserved v
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oSIST prEN ISO 16321-2:2018
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oSIST prEN ISO 16321-2:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 16321-2:2018(E)
Eye and face protection for occupational use —
Part 2:
Additional requirements for protectors used during
welding and related techniques
1 Scope

This document specifies additional material, design, performance and marking requirements for eye

and face protectors designed to provide protection for the eyes and faces of persons against occupational

hazards during welding and related techniques, such as optical radiation, impacts from flying particles

and fragments, and hot solids. The other applicable requirements for welding protectors are given in

ISO 16321-1.

This document also applies to those products of eye and face protection used for occupational-type

tasks but not performed as part of an occupation, e.g. "do-it-yourself".
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 4007, Eye and face protection — Vocabulary

ISO 18526-1 Eye and face protection —Test methods — Part 1: Geometrical optical properties

2),

ISO 18526-2 Eye and face protection — Test methods — Part 2: Physical optical properties

ISO 18526-3 , Eye and face protection — Test methods — Part 3: Physical and mechanical properties

ISO 18526-4 , Eye and face protection — Test methods — Part 4: Head forms

ISO 16321-1, Eye and face protection for occupational use — Part 1: General requirements

ISO 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers
ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4007 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
1) Under preparation (Stage at the time of publication ISO/DIS 18526-1)
2) Under preparation (Stage at the time of publication ISO/DIS 18526-2)
3) Under preparation (Stage at the time of publication ISO/DIS 18526-3)
4) Under preparation (Stage at the time of publication ISO/DIS 18526-4)
© ISO 2018 – All rights reserved 1
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)

For the purposes of this document, “welding protector” is used as a synonym for welding helmets,

welding hand shields, welding goggles, welding spectacles and the associated frames and mountings.

4 Requirements
4.1 General

Only those requirements that are different from or supplement the ISO 16321-1 specifications are given

in this document.
The following requirements from ISO 16321-1:— shall be met:
— Clause 4: General requirements for protectors
— Clause 5.2: Refractive power and prismatic deviation
— Clause 6.1: Detection of signal lights, optional

— Clause 6.4: Uniformity of luminous transmittance (not for automatic welding filters)

— Clause 7.2: Headbands and harnesses
— Clause 7.3: Quality of material and surface of lenses

— Clause 7.4: Basic Impact Level (for welding helmets, hand shields, frames or mountings)

— Clause 7.7: Resistance to corrosion, where applicable
— Clause 7.8: Resistance to ignition
— Clause 7.9: Penetration of vents, where applicable
— Clause 7.10: High-speed impact resistance, Impact Level C, D, E, optional
— Clause 7.11: High mass impact, Impact Level HM, optional
The additional requirements given in this document shall be met.

The welding protectors described in this document are intended for use at temperatures from -5 °C

to +55 °C. Physical and mechanical requirements are generally specified at normal temperatures

(23 ± 5) °C. Where critical aspects of protection are likely to be affected by temperatures towards

the extremes of the normal range of occupational environments (from -5 °C to +55 °C), physical

and mechanical requirements are included (sometimes optionally) to ensure the protection is not

compromised. Physical and mechanical requirements are provided for validation of claims for

protection at extremes of temperature.
4.2 Headforms

Unless the manufacturer defines the headforms according to ISO 18526-4 that are compatible with the

welding protector, the test methods where headforms are required shall use the headform 1-M as the

default headform.
4.3 Field of view

Welding protectors, in the as-worn position, shall have a minimum unobstructed field of view in front

of each eye of 8° temporally and 15° nasally in the horizontal meridian, and 24° total in the vertical

meridian, when measured at the corneal apex of the headform according to ISO 18526-3:—, 6.2.

The field of view of peripheral awareness welding filters shall begin no less than 45° temporally from

the straight ahead position of gaze. This requirement shall be measured according to ISO 18526-3:—,

6.2, by using the appropriate headform.
2 © ISO 2018 – All rights reserved
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
4.4 Physical optical requirements for welding filters
4.4.1 General

Welding filters are intended to protect against radiation generated by various welding processes,

which emit a significant amount of radiation in the UV, visible and IR wavelength regions. Therefore

requirements in the UV and IR and for glare in the visible exist that are taken into account by requiring

specific scale numbers.

Welding filters shall be tested according to ISO 18526-2:—, Clauses 6, 7, 8 and 10, and classified

according to Table 1.

For the determination of luminous transmittance of welding filters in this document, the luminous

transmittance values are based on the spectral distribution of CIE standard illuminant A (see

ISO 11664-1 and ISO 11664-2).
4.4.2 Transmittance requirements and scale numbers
4.4.2.1 Luminous transmittance and scale numbers

The scale numbers of welding filters are defined based on the value of the luminous transmittance in

Table 1.
Table 1 — Transmittance requirements for welding filters
S c a l e Spectral transmittance Luminous transmittance IR-A Near IR
number τ(λ) ô trans-mit- trans-mit-
tance tance τ
NIR
380 nm < λ ≤ 780 nm
IRA
200 nm 313 nm 365 nm Maximum Minimum 780 780
% % nm < λ ≤ nm < λ ≤
≤ λ ≤ < λ ≤ < λ ≤
1400 nm 3000 nm
313 nm 365 nm 400 nm
Maxi- Maximum
Maximum
mum% %
Maximum Maximum
% %
W 1,2 0,0003 50 100 74,4 30 30
W 1,4 0,0003 35 74,4 58,1 25 25
W 1,7 0,0003 22 58,1 43,2 20 20
W 2 0,0003 14 43,2 29,1 15 15
W 2,5 0,0003 6,4 29,1 17,8 12 12
W 3 0,0003 2,8 17,8 8,5 9 9
W 4 0,0003 0,95 8,5 3,2 5 5
W 5 0,0003 0,30 ô 3,2 1,2 3,5 3,5
W 6 0,0003 0,10 1,2 0,44 1,5 1,5
W 7 0,0003 0,050 0,44 0,16 1 1
W 8 0,0003 0,025 0,16 0,061 1 1
W 9 0,0003 0,012 0,061 0,023 1 1
W 10 0,0003 0,006 0,023 0,0085 1 1
W 11 0,0003 0,0032 0,0085 0,0032 1 1
W 12 0,0003 0,0012 0,0032 0,0012 1 1
W 13 0,0003 0,00044 0,0012 0,00044 1 1

NOTE The measurement of spectral transmittance values between 2800 nm and 3000 nm might require the purging of

the spectrophotometer with dry nitrogen to reduce the influence of water molecules in the air on the transmittance values.

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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
Table 1 (continued)
S c a l e Spectral transmittance Luminous transmittance IR-A Near IR
number τ(λ) ô trans-mit- trans-mit-
tance tance τ
NIR
380 nm < λ ≤ 780 nm
IRA
200 nm 313 nm 365 nm Maximum Minimum 780 780
% % nm < λ ≤ nm < λ ≤
≤ λ ≤ < λ ≤ < λ ≤
1400 nm 3000 nm
313 nm 365 nm 400 nm
Maxi- Maximum
Maximum
Maximum Maximum mum% %
% %
W 14 0,00016 0,00016 0,00044 0,00016 1 1
W 15 0,000061 0,000061 0,00016 0,000061 1 1
W 16 0,000023 0,000023 0,000061 0,000023 1 1

NOTE The measurement of spectral transmittance values between 2800 nm and 3000 nm might require the purging of

the spectrophotometer with dry nitrogen to reduce the influence of water molecules in the air on the transmittance values.

NOTE 1 The IR transmittance values are determined from the spectral transmittance or by a broadband method.

4.4.2.2 Marking of welding filters

Welding filters that meet the transmittance requirements given in Table 1 shall be marked by code

letter W.The code letter W refers to welding filters that can affect detection of signal lights and do not

have enhanced reflectance in the infrared spectral range. The code letter WC refers to welding filters

with minimally altered detection of signal lights, the code letter WR to welding filters with enhanced

infrared reflection, and the code letter WRC to welding filters that both show minimally altered colour

perception and enhanced infrared reflection.

NOTE 2 Information on the appropriate scale numbers to use for specific welding and related applications are

given in ISO 19734.
4.4.2.3 Spectral transmittance requirements
The spectral transmittance requirements are given in Table 1 and the following:
— the blue-light transmittance τ shall be less than the luminous transmittance τ
B vA
4.4.2.4 Additional requirements for peripheral awareness welding filters

In addition to the mechanical and thermal requirements of the complete welding protector, peripheral

awareness welding filters shall satisfy the following requirements when the transmittances

are measured according to ISO 18526-2:—, Clause 6, using relevant test methods according to

ISO 18526-2:—, Clauses 7 to 10.

The manufacturer shall identify the darkest welding filter that may be used with the welding protector

that is fitted with peripheral awareness welding filters.

— The blue-light transmittance of a peripheral awareness welding filter τ shall be less than 5000

times the luminous transmittance of the darkest filter identified by the manufacturer.

— The maximum spectral transmittance in the ultraviolet and the near infrared transmittance τ ,

NIR

as given in Table 1, required for the darkest filter identified by the manufacturer, shall apply to the

peripheral awareness welding filter.

NOTE In situations when other welders are working beside and in situations where reflected light can be

transmitted through the peripheral awareness welding filter, it can be preferable to cover these filters.

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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
4.4.3 Narrow angle scatter (reduced luminance coefficient)
−2-1

The reduced luminance coefficient l* of flat welding filters shall not be greater than10,(cd⋅⋅m) lx ,

−2-1

when measured according to ISO 18526-2:—, 14.2. A higher value of up to 30,(cd⋅⋅m) lx for

automatic welding filters with curved shape is allowed if the product is marked accordingly (see

marking requirements as well as requirements for information to be supplied by the manufacturer). For

automatic welding filters, this value shall be applied for the light state and for all nominal dark states.

NOTE For automatic welding filters with multiple dark state scale numbers, it would be helpful to display

the relationship between the scale number and the reduced luminous coefficient graphically.

4.4.4 Minimum robustness for unmounted welding filters (Static Load Test)

Unless stated otherwise, the welding filter shall be tested according to ISO 18526-3:—, 7.1.2, and

subsequently examined by a trained observer.

During testing, the welding filter shall not fracture or deform as described below:

a) welding filter fracture: A welding filter is considered to have fractured if:
— it cracks through its entire thickness into two or more separate pieces, or;

— a trained observer can see either a piece of material that has become detached from the welding

filter surface opposite that to which the force has been applied or a corresponding surface defect

on this opposite surface.

b) welding filter deformation: A welding filter is considered to have deformed if a mark appears on the

white paper on the opposite side to that contacted by the ball.
4.4.5 Resistance to ultraviolet radiation
After exposure according to ISO 18526-3:—, 6.8:

a) The relative change of luminous transmittance shall not be greater than the values in Table 2;

b) The value of the reduced luminance coefficient of welding filters shall not exceed the values given

in 4.4.3;

c) any applicable UV and/or IR requirements for the initial Ä shall continue to be satisfied.

vA

Table 2 — Permissible relative change in luminous transmittance following the ultraviolet

radiation test
Initial luminous transmittance Permissible relative change for welding
filters
lMaximum Minimum
% %
100 17,8 ± 5
17,8 0,44 ± 10
0,44 0,023 ± 15
0,023 0,0012 ± 20
0,0012 0,000023 ± 30

The requirements for resistance to ultraviolet radiation do not apply to automatic welding filters due to

the use of protective cover plates.
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oSIST prEN ISO 16321-2:2018
ISO/DIS 16321-2:2018(E)
4.5 Automatic welding filters
4.5.1 General

During a welding process or similar working processes, automatic welding filters attenuate the

luminance from a welding arc to a safe non-hazardous level. Automatic welding filters are intended to

protect against radiation generated by various welding processes since these emit a significant amount

of radiation in the UV, visible and IR wavelength region. Therefore requirements in the UV and IR and

glare in the visible exist that are taken into account by requiring specific scale numbers.

Automatic welding filters attenuate the luminance and UV and IR irradiance generated in the welding

process to non-hazardous levels. The automatic welding filter incorporates passive filters to reduce the

UV and IR irradiance to safe levels even in the unactivated light state and a variable filter to reduce the

luminance once the arc is struck. In this light state there is sufficient luminous transmittance to enable

mobility, work organization and electrode placement. After the welding arc strikes and within a defined

switching time the luminous transmittance of the filters changes to the shade number set (dark state).

4.5.2 Transmittance requirements

The following requirements a) to h) shall be satisfied when the transmittances are measured according

to ISO 18526-2:—, Clauses 6, 17.1 and 17.2.

a) The minimum luminous transmittance in the light state shall be 1,2 % when measured at all three

temperatures (-5 ± 2)°C, (23 ± 5)°C and (55 ± 2)°C. If more extreme temperature limits are specified

by the manufacturer, these shall be substituted here.

b) The luminous transmittance requirements given in Table 1, shall apply to the light and all nominal

dark states. The measurements shall be taken at (- 5 ± 2) °C, (23 ± 5) °C and (55 ± 2) °C. If more

extreme temperature limits are specified by the manufacturer, these shall be substituted here

...