Introduction: Welding is
considered to be one of the main sources of occupational exposure to non
ionizing radiations. The present study was conducted to examine the rate of
occupational exposure to non-ionizing radiation in common welding processes.
Materials and
Methods: In the present descriptive analytical study, occupational
exposure to different types of non-ionizing radiations including
electromagnetic fields with extremely low frequency and ultraviolet and
infrared radiations were examined in five types of arc welding processes at the
welding department of the technical and vocational training center of Malayer.
Electric field intensities and magnetic field intensities were measured using
the HOLADAY HI-3604 instrument and based on the ANSI/IEEE Std 644-1994 method. Ultraviolet and infrared radiation intensities
were measured using Hagner-EC1 radiometer (made in Sweden).
Results: Electric
field intensities and magnetic field intensities were lower than the exposure
limits in the different types of welding processes examined. Nevertheless, the
intensity of UV-B radiation
exposure was higher than the exposure limits in the different types of welding
processes examined, while UV-A radiation exposure was only higher than the
exposure limits in arc welding. The results of measuring UV radiation
intensities transmitted through protective goggles revealed the acceptable
shade number of the lenses used. However, welders' clothing did not provide
adequate protection. Moreover, the results showed that welders' infrared
radiation exposure degree was much lower than the exposure limits.
Conclusion: The intensity
of exposure to non-ionizing radiations was influenced by the type of welding
process taken. Given the overexposure of welders to UV-B radiation in unshielded conditions, wearing clothes with
an Ultraviolet Protection Factor of 50 is necessary for providing better
protection.