Departamento de Engenharia Mecânica e Industrial, Faculdade de Ciências e Tecnologia, UNIDEMI, Universidade Nova de Lisboa , Caparica , Portugal .
Inhal Toxicol. 2014 May;26(6):345-52. doi: 10.3109/08958378.2014.897400.
This study is focused on the characterization of particles emitted in the metal active gas welding of carbon steel using mixture of Ar + CO2, and intends to analyze which are the main process parameters that influence the emission itself. It was found that the amount of emitted particles (measured by particle number and alveolar deposited surface area) are clearly dependent on the distance to the welding front and also on the main welding parameters, namely the current intensity and heat input in the welding process. The emission of airborne fine particles seems to increase with the current intensity as fume-formation rate does. When comparing the tested gas mixtures, higher emissions are observed for more oxidant mixtures, that is, mixtures with higher CO2 content, which result in higher arc stability. These mixtures originate higher concentrations of fine particles (as measured by number of particles by cm(3) of air) and higher values of alveolar deposited surface area of particles, thus resulting in a more severe worker's exposure.
本研究专注于使用 Ar+CO2 混合物对碳钢进行金属活性气体焊接时产生的颗粒进行特性描述，并旨在分析哪些是主要的工艺参数会影响颗粒的排放本身。研究发现，排放颗粒的数量（通过颗粒数量和肺泡沉积表面积来测量）显然取决于与焊接前沿的距离，也取决于主要的焊接参数，即焊接过程中的电流强度和热输入。空气中细颗粒的排放似乎随着烟尘形成速率的增加而随着电流强度的增加而增加。在比较测试的混合气体时，观察到氧化剂含量更高的混合气体（即 CO2 含量更高的混合气体）的排放量更高，这导致电弧稳定性更高。这些混合物产生更高浓度的细颗粒（如通过每立方厘米空气中的颗粒数来测量）和更高的颗粒肺泡沉积表面积值，从而导致工人更严重的暴露。
