AS 3957-1991

1 - AS 3957:1991/NZS 5852:1991 LIGHT-TRANSMITTING SCREENS AND CURTAINS FOR WELDING OPERATIONS
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
6 - 3 DEFINITIONS
6 - 3.1 Luminance factor
6 - 3.2 Luminance transmittance
6 - 3.3 Radiance reduction factor
6 - 3.4 Spectral transmittance
6 - 3.5 Ultraviolet radiation
6 - 3.6 Welding
6 - 3.7 Welding curtain
6 - 3.8 Welding screen
6 - 4 CLASSIFICATION
6 - 5 MATERIALS
7 - 6 DESIGN AND CONSTRUCTION
7 - 6.1 General
7 - 6.2 Visibility
7 - 7 PERFORMANCE REQUIREMENTS
7 - 7.1 General
7 - 7.2 Transmission of optical radiation
7 - 7.2.1 Ultraviolet spectral transmittance
7 - 7.2.2 Luminance transmittance
7 - 7.2.3 Blue light radiance reduction factor
7 - 7.2.4 Luminance factor
7 - 7.3 Resistance to ultraviolet radiation
7 - 7.4 Flame propagation
8 - 7.5 Physical properties of flexible materials
8 - 7.6 Seam and eyelet strength
8 - 8 MARKING
9 - APPENDIX A - DETERMINATION OF ULTRAVIOLET SPECTRAL TRANSMITTANCE
9 - A1 SCOPE
9 - A2 PRINCIPLE
9 - A3 APPARATUS
9 - A4 SPECIMEN
9 - A5 SPECIMEN PREPARATION
9 - A6 SCALE CALIBRATION OF SPECTROPHOTOMETER
9 - A7 PROCEDURE
9 - A8 TEST REPORT
10 - APPENDIX B - DETERMINATION OF LUMINANCE TRANSMITTANCE
10 - B1 SCOPE
10 - B2 PRINCIPLE
10 - B3 APPARATUS
10 - B4 SPECIMEN
10 - B5 SPECIMEN PREPARATION
10 - B6 PROCEDURE
10 - B7 CALCULATION
10 - B8 TEST REPORT
12 - APPENDIX C - DETERMINATION OF BLUE LIGHT RADIANCE REDUCTION FACTOR
12 - C1 SCOPE
12 - C2 PRINCIPLE
12 - C3 APPARATUS
12 - C4 SPECIMEN
12 - C5 SPECIMEN PREPARATION
12 - C6 PROCEDURE
12 - C7 CALCULATION
12 - C8 TEST REPORT
14 - APPENDIX D - DETERMINATION OF LUMINANCE FACTOR
14 - D1 SCOPE
14 - D2 PRINCIPLE
14 - D3 APPARATUS
14 - D4 SPECIMEN
14 - D5 SPECIMEN PREPARATION
14 - D6 PROCEDURE
14 - D7 CALCULATION
14 - D8 TEST REPORT
15 - APPENDIX E - DETERMINATION OF RESISTANCE TO ULTRAVIOLET RADIATION
15 - E1 SCOPE
15 - E2 PRINCIPLE
15 - E3 APPARATUS
15 - E4 SPECIMEN
15 - E5 SPECIMEN PREPARATION
15 - E6 PROCEDURE
15 - E7 TEST REPORT
16 - APPENDIX F - ASSESSMENT OF SEAM AND EYELET STRENGTH
16 - F1 SCOPE
16 - F2 PRINCIPLE
16 - F3 APPARATUS
16 - F4 SPECIMEN
16 - F5 SPECIMEN PREPARATION
16 - F6 PROCEDURE
16 - F7 TEST REPORT

Specifies safety and performance requirements for screens and curtains intended to afford direct visual contact of the work area while providing protection against optically hazardous radiations generated during the welding process. The Standard applies to all welding screens, whether portable or permanently installed, but does not apply to screens for protection against laser radiation, nor does it apply to protective materials for direct viewing of the welding process. The main focus of the document is on optical radiation transmission. Provision is made for marking screens and curtains with categories determined in accordance with maximum and minimum luminance transmittance. Identical with NZS 5852:1991 and produced as a Joint Australian/New Zealand Standard.

This Standard sets out the safety and physical requirements for light-transmitting screens and curtains intended to provide protection against hazardous radiations generated during welding processes while simultaneously affording visual contact with the working position. This Standard applies to all welding screens and curtains whether portable or permanently installed. This Standard does not apply to screens used for protection against laser radiation.NOTE: This Standard does not apply to protective materials for direct viewing of the welding processes, which are dealt with in AS 1336, AS 1337, and AS 1338, or to eye protection against laser radiation.

In Australia First published as AS 3957-1991.
In New Zealand First published as NZS 5852:1991.