文章基本信息

标题：Numerical Simulations to Determine the Most Appropriate Welding and Ventilation Conditions in Small Enclosed Workspace
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作者：Nobuyuki SHIBATA ; Masaki TANAKA ; Jun OJIMA 等
期刊名称：Industrial Health
印刷版ISSN：0019-8366
电子版ISSN：1880-8026
出版年度：2000
卷号：38
期号：4
页码：356-365
DOI：10.2486/indhealth.38.356
出版社：National Institute of Occupational Safety and Health
摘要：In order to improve arc welding work in a small enclosed workspace, numerical simulations were conducted to find the most appropriate welding and ventilation conditions, such as welding currents, hood position and flow rates with no blowhole formation. In the simulations, distributions of airflow vectors and fume concentrations were calculated for two hood opening positions: one faced a welder's breathing zone, the other a contaminant source. As a result it was predicted that a hood opening facing a breathing zone remarkably lowered the fume concentration in the breathing zone compared with that facing a contaminant source. The reliability was confirmed in CO₂ arc welding experiments in the enclosed workspace by using a welding robot. In addition, the number of blowholes in welds, examined with x-ray, decreased with the increase in the welding current and with the decrease in the exhaust flow rate. These results showed that the fume concentration near welder's breathing zone and the number of blowholes could be reduced effectively by appropriate selection of the welding current and hood position, and it was confirmed that the numerical simulations were sufficiently useful to predict these appropriate welding conditions.
关键词：Numerical prediction;Welding;Enclosed space;Local exhaust ventilation;Blowhole defect