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通过对焊接气溶胶粒子粒度分布随时间变化的实测结果的分析，应用气溶胶粒子凝并的基本理论，推导了焊后烟尘粒子的凝并方程，并利用凝并方程的解计算了焊接气溶胶粒子的粒度分布，与实测结果进行了比较，二者基本一致．说明了在一个封闭容器中，焊接气溶胶粒子的自然沉降作用可以忽略不计，其体积浓度基本不变，主要发生布朗凝并，其结果使数目浓度和粒子粒度分布随时间变化．
Through the analysis of the measured results of particle size distribution of welding aerosol over time, the condensation theory of aerosol particles is deduced. The condensation equation of the soot particle after welding is deduced. The solution aerosol Particle size distribution, compared with the measured results, the two are basically the same. It shows that in a closed vessel, the natural sedimentation of solute aerosol particles is negligible, the volume concentration of which is essentially constant, and the coagulation of brown coagulation occurs mainly. As a result, the number concentration and particle size distribution change with time.