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. The 1/3 octave bands from these with center frequencies of 20 to 80 kHz were selected and used in the calculations. The selection was based on the values of the correlation coefficients and standard deviations of the fit. The assessed sound pressure levels averaged for ca. 17 s long welding times showed ±1 dB uncertainty, which was equal to that attainable in the direct measurements with class 1 m in the field. For the averaging time of 0.5 s, the uncertainty was higher but still acceptable. Moreover, the time series of the assessed sound pressure levels closely resembled those measured directly. Minor discrepancies observed at the very beginning of the welding runs were explained by unstable acoustic emission during the electric arc strike between the base material and the electrode rod.

中文翻译：

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从测量的超声压力水平评估电弧焊噪声。第三部分：现代焊接技术

本系列的前几篇论文中报告了根据选定高频带中的声压级评估总声压级及其 A 加权滤波对应物的新方法，已针对四种现代焊接技术进行了测试：RapidArc 、CMT、交流脉冲和冷弧。113 次焊接的测量结果分为两组。第一组中的这些用作计算声压级相关方程的数据，而其他组用作对照。从中选择了中心频率为 20 至 80 kHz 的 1/3 倍频程频带并将其用于计算。选择基于相关系数的值和拟合的标准偏差。评估的声压级平均为约。17 s 长的焊接时间显示出 ±1 dB 的不确定性，这与现场 1 m 级直接测量中可达到的相同。对于 0.5 s 的平均时间，不确定性较高，但仍然可以接受。此外，评估的声压级的时间序列与直接测量的非常相似。在焊接运行开始时观察到的微小差异是由于母材和电极棒之间的电弧冲击期间不稳定的声发射造成的。