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Int J Fire Sci Eng > Volume 26(3); 2012 > Article
Fire Science and Engineering 2012;26(3):60-66.
DOI: https://doi.org/10.7731/KIFSE.2012.26.3.060    Published online June 30, 2012.
용접·절단 작업시 화재위험성에 관한 실험적 연구
중앙소방학교 소방과학연구실
An Experimental Study on the Fire Risk at Welding¡¤Cutting Process
Lee Sung-Ryong
National Fire Research Laboratory, National Fire Service Academy
본 연구에서는 건설현장 등에서 주로 사용되는 용접 절단기의 작업시 화재위험성을 평가하였다. 실험에는 인버터 AC/DC TIG 용접기와 인버터 에어프리즈마 절단기가 사용되었다. 용접 절단 작업시 비산되는 불티의 온도를 측정하였다. 작업높이와 입력전류의 변화에 따라 비산된 불티의 크기 및 비산범위를 측정하였다. 또한, 용접 절단기 화재원인 중 가장 높은 비율을 차지하는 가연물 근접방치에 의한 화재위험성을 평가하였다. 가연물로는 건초, 방진막, 우레탄폼, 비닐, 종이, 유류가 사용되었다. 용접 절단 작업시 불티의 온도가 최대 $450^{circ}C$까지 상승하였다. 2.5 m 높이에서 절단 작업시 불티가 최대 4.7 m까지 비산되었다. 용접 절단 작업시 주위에 가연물이 존재할 경우 비산된 불티에 의해 가연물에 착화되어 화재로 발전할 가능성이 매우 높다.
In this study, it was evaluated the fire risk during welding cutting tasks. Welding-cutting machines are representatively used at construction sites. Inverter AC/DC TIG welding macnine and inverter air plasma cutting machine were used in experiments. Temperature of spreaded cinders was measured using a thermal camera. Cinder sizes and spread range were measured according to the height and input current. It was also evaluated the fire risk during welding-cutting process, when flammable materials were located around the working area. There were used hay, dust fence, urethane foam, vinyl, paper and oil as flammable materials. Temperature of spreaded cinders was reached at about $450^{circ}C$. Cinders were spread approximately 4.7 m, when a worker carried out cutting process at 2.5 m height. The possibility of a fire is very high, when flammable materials were located around the working area.
Key Words: Welding machine, Cutting machine, Fire risk, Welding-cutting cinder, Flammable material

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