Arc welding noise assessment from the measured ultrasound pressure levels. Part III: Modern welding techniques.

The new method of the assessment of total sound pressure levels and their A-weighting-filtered counterparts from the sound pressure levels in a selected high-frequency band, reported in previous papers from this series, was tested for four modern techniques of welding: RapidArc, CMT, AC Pulse, and Cold Arc. The measurement results for 113 welding runs were divided into two groups. These in the first group served as data for calculations of the correlation equations for the sound pressure levels, while the others were applied as control ones.

Arc welding noise assessment from the measured ultrasound pressure levels. Part II: Pulsed and double pulsed metal active gas welding.

The assessment method of the total and A-weighting-filtered sound pressure levels from the sound pressure levels in selected bands of ultrasonic frequencies, suggested in Part I of this work, was verified on the basis of 226 sets of measurement results of acoustic emission during welding. The pulsed and double pulsed metal active gas welding (MAG-P and MAG-DP) was studied, that constituted a continuation of research on MAG methods. It was shown that the total sound pressure levels due to welding could be reasonably assessed from the sound pressure levels in the octave band with center frequency of 31.

Arc welding noise assessment from the measured ultrasound pressure levels: Part I: The metal active gas welding.

Acoustic spectra of sound emitted by metal active gas welding in series of thirty experiments with different technological parameters evidenced that about 50% of the acoustic energy generated during welding was transmitted by the waves belonging to the octave band with center frequency of 31.5 kHz. Since the time series of the sound pressure levels in this frequency band resembled that of the respective total sound pressure levels, empirical correlation equations of the two quantities and the welding current were fitted.

Noise exposure assessment and abatement strategies at an indoor firing range.

Exposure to hazardous impulse noise is common during the firing of weapons at indoor firing ranges. The aims of this study were to characterize the impulse noise environment at a law enforcement firing range; document the insufficiencies found at the range from a health and safety standpoint; and provide noise abatement recommendations to reduce the overall health hazard to the auditory system. Ten shooters conducted a typical live-fire exercise using three different weapons--the Beretta.

[Prevention of vibration syndrome in selected occupational groups in the metallurgy industry].

Medical examinations were carried out in a group of 297 men exposed to hand-arm vibration in the metallurgical industry. The group consisted of 93 rammers, 77 grinders and 127 chippers. The level of vibration at workposts was also measured.