Table 01 Main emitting equipment of noise Equipamenteo NPS in dB () * (In idling) NPS in dB () * (In operation) Escavadeira 83 93 weld Machine 89 99 Sander 86 101 agricultural Tractor 86 92 air Compressor 89 98 Equipment of individually jatear 79 90 * Levels of noise emitted by equipment, measured to a distance of one (1) meter of the equipment. The points chosen for the measurements were always next to the noisy equipment, more specifically where the workers carried through its activities and circulated frequently. The measurements had been carried through when all the equipment were on at the same time, that it is the preoccupying situation most constant and, of the point of view of the noise. Newcastle University describes an additional similar source. The equipment used in this work for the measurements of noise had been the Measurer of Level of Sound, model 2250, , that is, to the noise proceeding only from the activities of welding or jateamento. Any measured signal that during the procedure had been contaminated for noise of not constant sources of the routine equipment of the teams (as for example: noise of strange vehicle or buzzer of ambulance passing in the same place or, signal measured with strong wind blowing frontalmente in the microphone or high voice excessively also close to the microphone), was discarded. Then, amongst the many carried through measurements it stops> verification of bother situation, had been chosen the eight (8) that more they reflected with allegiance the problem. Further details can be found at Professor Roy Taylor, an internet resource.
Of these eight (8) measurements of the noise produced in the operations of welding and jateamento, five (5) of them had been carried through in the operation of welding and three (3) in the operation of jateamento. The time of measurement of each one was changeable. For measurement of acoustic comfort, all the signals had been taken the NBR10151 in agreement the NBR10152, that establishes that all the measurements for evaluation of acoustic comfort must be carried through during about at least 5 minutes, being that the values must be the result of the arithmetic mean of the values gotten in at least three distinct positions, at least moved away between itself about 0,5 m.