Welding fumes (WFs) can cause occupational pneumonoconiosis and other diseases in workers. WFs have complex chemical composition and morphology depending on the welding conditions. The WF surface is a key factor affecting those diseases. The objective of this study was to establish an analytical method focused on characterizing individual WFs and welding slags (WSs) formed during CO₂ arc welding processes for knowledge acquisition of risk assessment. Especially, the characterization was focused on the elemental distributions near the surfaces obtained using fluxing agents and size of the WFs. WFs were collected using personal samplers. After welding, WS was also collected. The fluxing elemental distribution (e.g., Bi) near the surfaces WS and WFs were analyzed through scanning electron microscopy and energy-dispersive X-ray spectroscopy. As a result, some of the micron-sized spherical particles (SPs) grew by incorporating nanosized primary particles composed of other metal species. The fluxing agents formed elemental distribution patterns on the SP surface. Bi were dotted in an agglomerate. Mn amount in WS depends on Mn amount in the WFs. These results obtained through the analysis of both the WS and WF surface as well as the particle sizes will facilitate the establishment of exposure assessment models.

焊接烟雾 (WFs) 会导致工人的职业性尘肺病和其他疾病。WFs 具有复杂的化学成分和形态，具体取决于焊接条件。WF表面是影响这些疾病的关键因素。本研究的目的是建立一种分析方法，重点是表征在 CO _{2过程中形成的单个 WF 和焊渣 (WS)}用于风险评估知识获取的弧焊工艺。特别是，表征集中在使用助熔剂获得的表面附近的元素分布和WFs的大小。WFs 是使用个人采样器收集的。焊接后，WS 也被收集。通过扫描电子显微镜和能量色散 X 射线光谱分析了表面 WS 和 WFs 附近的通量元素分布（例如，Bi）。结果，一些微米级球形颗粒（SP）通过掺入由其他金属物质组成的纳米级初级颗粒而生长。助熔剂在 SP 表面形成元素分布模式。Bi 被点缀在一个团块中。WS 中的 Mn 量取决于 WFs 中的 Mn 量。