This study measured the fume particle size distribution and fume generation rate during arc welding of cast iron and estimated the generation rate of respirable dust. In addition, the generation rate of particles with a diameter of 0.3 µm or less was estimated. In this experiment, three types of filler materials (mild steel wire, stainless steel wire, and mild steel covered electrodes) with main constituents of Fe or Fe-Cr-Ni, as proposed previously by the authors, were used. The welding methods were gas metal arc welding and shielded metal arc welding. The fumes measured in this research contained 73–91% respirable dust, and the fume generation rates were in the range of 1.96–12.2 mg/s. The results of this study were as follows: (i) the welding current affects the generation rate of respirable dust, and it is highly likely that the higher the fume generation rate, the more respirable dust is generated; (ii) the generation rates of respirable dust at low and high current were highest when mild steel covered electrodes and stainless steel wire was used, respectively; and (iii) the generation rate of particles with a diameter of 0.3 µm or less was highest when stainless steel wire is used.

本研究测量了铸铁电弧焊过程中烟气的粒度分布和烟气的产生率，并估算了可吸入粉尘的产生率。另外，估计直径为0.3μm或更小的颗粒的产生速率。在该实验中，使用了作者先前提出的三种主要成分为Fe或Fe-Cr-Ni的填充材料（低碳钢丝，不锈钢丝和低碳钢包覆电极）。焊接方法为气体金属电弧焊和保护金属电弧焊。在这项研究中测得的烟雾中含有73-91％的可吸入粉尘，并且烟雾产生速率在1.96-12.2 mg / s的范围内。这项研究的结果如下：（i）焊接电流影响可吸入粉尘的产生率，烟尘产生率越高，产生的粉尘越容易吸入；（ii）当分别使用低碳钢包覆的电极和不锈钢丝时，在低电流和高电流下可吸入粉尘的产生率最高；（iii）使用不锈钢线时，直径为0.3μm以下的粒子的发生率最高。