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BS EN IEC 62822-3:2023 – TC

BS EN IEC 62822-3:2023 – TC

$280.87

Tracked Changes. Electric welding equipment. Assessment of restrictions related to human exposure to electromagnetic fields (0 Hz to 300 Hz) – Resistance welding equipment

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BSI 2023 194
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IEC 62822-3:2023 applies to equipment for resistance welding and allied processes designed for occupational use by professionals and for use by laymen. More generally, this document covers equipment for which the welding current flows in an electrical circuit whose geometry cannot be changed and regardless of the technology of the current generator (for example LF-AC, MF-DC for spot or seam welding or capacitive discharge used for stud welding). This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) inclusion of the uncertainties in the results of the assessment; b) simplification of the methods of exposure assessment.

PDF Catalog

PDF Pages PDF Title
122 undefined
125 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
126 English
CONTENTS
130 FOREWORD
132 1 Scope
2 Normative references
133 3 Terms, definitions, quantities, units, constants and symbols
3.1 Terms and definitions
135 3.2 Quantities and units
3.3 Constants
136 3.4 Symbols
4 Requirements
137 5 Assessment methods
5.1 General
5.2 Methods based on reference levels
5.2.1 General
138 5.2.2 Assessment based on measured magnetic field
139 Figures
Figure 1 – Exposure measurement at the head position
Figure 2 – Exposure measurement at trunk position
140 5.2.3 Assessment based on measured welding current
Figure 3 – Exposure measurement at limb positions (hands and thigh)
142 5.3 Methods based on assessment of corporal quantities (basic restrictions)
5.3.1 General
Figure 4 – Compliance perimeters according to reference levels (action levels)
143 5.3.2 Method based on coupling coefficients
145 5.3.3 Method based on the correction factor
Figure 5 – Compliance perimeters according to basic restrictions(exposure limit values)
146 5.3.4 Method based on the human model simulation
147 Figure 6 – Magnetic field around the human body obtained by source modelling
148 5.3.5 Result comparison
6 Measurement considerations
6.1 Measurement instruments for magnetic fields or exposure levels
6.1.1 General
Figure 7 – Example of induced electric field in a human bodyexposed to a welding gun (I = 1kA to 50 Hz)
149 6.1.2 Probe(s)
6.1.3 Handheld field meter
6.1.4 Measurement system with separate elements
150 6.2 Instruments for recording
6.2.1 Welding current recording
6.2.2 Magnetic field recording
151 6.3 Signal processing (applicable to any welding current waveform)
6.3.1 General
6.3.2 Application of the weighted peak method in the time domain
6.3.3 Spatial averaging
6.3.4 Time averaging
6.4 Uncertainty of assessment
152 7 Computational assessment methods
7.1 General
7.2 Quasi-static approximation
7.3 Human body models for simulation
153 7.4 Computational assessment against the basic restrictions
Tables
Table 1 – Examples of human models to determine inducedelectric fields in the low frequency range
154 8 Source model
8.1 General
8.2 Source model example
155 Figure 8 – Welding current flowing in a (a × b) rectangular loop configuration
156 9 EMF data sheet and assessment report
158 Annex A (informative)Example of assessment based on the individual components
A.1 General
A.2 Welding current generator
Figure A.1 – Assessment of a complete welding system
Figure A.2 – Typical component based assessment
159 Figure A.3 – LF-AC (left) and MF-DC (right) current waveforms
Figure A.4 – Combined ELV for the sensory and health effects applicable to the head
160 Figure A.5 – Current exposure indices over the time for two welding technologies
Table A.1 – Current exposure index for LF-AC technology (Irms = 11,4 kA)
Table A.2 – GP current exposure index for LF-AC technology (Irms = 11,4 kA)
161 A.3 Coupling coefficient of welding circuit
Figure A.6 – Geometry of the stationary spot welding gun
Figure A.7 – Welding electric circuit model (in m)and one point of interest along the X axis
162 A.4 Welding-system
Figure A.8 – Coupling coefficient CCBI along the X axis
Figure A.9 – Exposure index (AL) along the X axis
163 Figure A.10 – Exposure index (ELV) along the X axis
164 Annex B (informative)Example datasheets
B.1 Example current generator datasheet
Figure B.1 – Example datasheet of the power source
165 B.2 Example datasheet of the welding circuit
Figure B.2 – Example datasheet of the electrode assembly
166 B.3 Example datasheets of equipment assembly
Figure B.3 – Datasheet example of the welding system
167 Figure B.4 – Example datasheet of the welding system (continuation)
168 Figure B.5 – Example datasheet of the welding system (continuation)
169 Annex C (informative)Coupling coefficient method
C.1 Principle
C.2 Validation of this method
C.2.1 Context
Table C.1 – Representative disk radius (geometric model)
170 C.2.2 Basic restriction against health effects
C.2.3 Basic restriction against sensory effects
Figure C.1 – Distribution of human to disk model exposure index ratios (health effects of ELV on trunk and hands)
171 C.3 Conclusion
Figure C.2 – Distribution of human to disk model exposure index ratios(sensory and health effects of ELV on the head)
Table C.2 – Coupling coefficients
173 Annex D (informative)Correction factor method
D.1 General
D.2 Principle
174 D.3 Example of correction factor finding
D.3.1 Context
D.3.2 Correction factor for the trunk and limbs
D.3.3 Correction factor for the head
Figure D.1 – Distribution of correction factor kE for health effects on trunk and hands
175 D.4 Conclusion
Figure D.2 – Distribution of correction factor kE for effects on the head (sensory and health)
176 Annex E (informative)Example of exposure assessments on a welding machine
E.1 General
E.2 Description of the spot welding workstation
E.3 Exposure conditions
177 Figure E.1 – Welding gun and its electric circuit model (yellow dash segments)
Figure E.2 – Magnetic field distribution around the exposed body
178 E.4 Main simulation parameters and results
E.4.1 Main simulation parameters
Figure E.3 – Configuration and electric field distribution on the exposed body (for 1 kA at f = 50 Hz)
Figure E.4 – Electric field distribution on hands (for 1 kA at f = 50 Hz)
179 E.4.2 Simulation results
E.5 Exposure assessments
E.5.1 General
E.5.2 Method based on magnetic field calculation
E.5.3 Method based on coupling coefficients
Table E.1 – Coupling coefficients for the magnetic field and on human model
Table E.2 – Results based on magnetic field calculation
180 E.5.4 Method based on the correction factor
E.5.5 Method based on the human model
Table E.3 – Results based on coupling coefficients
Table E.4 – Results based on the correction factor
Table E.5 – Results based on human model
181 E.6 Conclusion
182 Annex F (informative)Computational methods
F.1 General
F.2 SPFD method
F.3 Quasi-static – Finite element method
183 F.4 Impedance method
184 F.5 Hybrid technique of FEM and SPFD method
F.6 Computation of the magnetic vector potential
186 Annex G (informative)Averaging algorithms
G.1 Current density averaging over an area
G.1.1 General
G.1.2 Calculation of the current density in a Cartesian voxel
187 G.1.3 Calculation of the current density in a tetrahedron
G.1.4 Calculation of Javg
Figure G.1 – Field components on voxel edges
188 G.2 E-field averaging in a cubical volume
G.3 E-field averaging along an averaging distance
G.3.1 General
189 G.3.2 Algorithm to construct the integration path
190 Annex H (informative)Correspondence table between time domain and frequency domain
Table H.1 – Transcription of formulae
192 Bibliography

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BS EN IEC 62822-3:2023 - TC
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