EN ISO 21904-3:2018

European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test equipment and materials
6 Test procedure
7 Test parameters for generating capture efficiency data
8 Test report
Annex A (informative) - Equipment notes
Annex B (normative) - Trial tests
Annex C (informative) - Examples of test chambers
Annex D (normative) - Test procedures
Annex E (informative) - Data processing for test method 3
Annex F (normative) - Test parameters form to be filled
Annex G (informative) - Information about the necessity
        to measure leakage
Bibliography

ISO 21904-3:2018 defines a laboratory method for measuring the welding fume capture efficiency of on-torch extraction systems. The procedure only prescribes a methodology, leaving selection of the test parameters to the user, so that the effect of different variables can be evaluated.ISO 21904-3:2018 is applicable to integrated on-torch systems and to systems where a discrete extraction system is attached to the welding torch close to the arc area. The methodology is suitable for use with all continuous wire welding processes, all material types and all welding parameters.The method can be used to evaluate the effects of variables such as extraction flow rate, extract nozzle position, shielding gas flow rate, welding geometry, welding torch angle, fume emission rate, etc., on capture efficiency.