Measuring Exposed Magnetic Fields of Welders in Working Time
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- YAMAGUCHI-SEKINO Sachiko
- National Institute of Occupational Safety and Health
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- OJIMA Jun
- National Institute of Occupational Safety and Health
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- SEKINO Masaki
- Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo
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- HOJO Minoru
- Ota Regional Occupational Health Center
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- SAITO Hiroyuki
- National Institute of Occupational Safety and Health
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- OKUNO Tsutomu
- National Institute of Occupational Safety and Health
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Abstract
The assessment of the occupational electromagnetic field exposure of welders is of great importance, especially in shielded-arc welding, which uses relatively high electric currents of up to several hundred amperes. In the present study, we measured the magnetic field exposure level of welders in the course of working. A 3-axis Hall magnetometer was attached to a subject’s wrist in order to place the sensor probe at the closest position to the magnetic source (a cable from the current source). Data was acquired every 5 s from the beginning of the work time. The maximum exposed field was 0.35-3.35 mT (Mean ± SD: 1.55 ± 0.93 mT, N=17) and the average value per day was 0.04-0.12 mT (Mean ± SD: 0.07 ± 0.02 mT, N=17). We also conducted a finite element method-based analysis of human hand tissue for the electromagnetic field dosimetry. In addition, the magnetic field associated with grinders, an air hammer, and a drill using electromagnetic anchorage were measured; however, the magnetic fields were much lower than those generated in the welding process. These results agreed well with the results of the electromagnetic field dosimetry (1.49 mT at the wrist position), and the calculated eddy current (4.28 mA/m2) was much lower than the well-known guideline thresholds for electrical nerve or muscular stimulation.<br>
Journal
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- Industrial Health
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Industrial Health 49 (3), 274-279, 2011
National Institute of Occupational Safety and Health
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Details 詳細情報について
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- CRID
- 1390001204279236608
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- NII Article ID
- 130004828619
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- NII Book ID
- AA00672955
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- ISSN
- 18808026
- 00198366
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- NDL BIB ID
- 11160056
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed