摘要
为探究电焊熔珠引燃聚氨酯板(PUR)的能力,基于电焊熔珠制备试验平台及高速摄像仪对熔珠从产生至掉落的全过程进行记录,并分析电焊熔珠直径、动能、焊接距离对其引燃能力的影响,建立PUR引燃概率模型。结果表明:引燃熔珠粒径多数集中于1~3 mm,不燃熔珠的粒径主要分布在0~2 mm;0.12×10-4 J为熔珠临界动能值;固定焊接距离时,增大电流可增强引燃能力;电流恒定时,增大距离可降低引燃能力。分析以上因素,并使用Logistic回归模型建立了PUR引燃概率模型,验证表明该模型预测准确率较高,可初步预测电焊熔珠引燃PUR保温材料的概率。
In order to explore the ability of welding beads igniting polyurethane board(PUR),the ignition probability model of PUR was established based on the experimental platform of welding bead preparation and highspeed camera to record the whole process of bead formation to fall,and analyze the influence of welding bead diameter,kinetic energy and welding distance on its ignition ability.The results show that the particle size of the ignition molten beads is mostly concentrated in the range of 1 mm to 3 mm,and the particle size of the noncombustible molten beads is mainly distributed in the range of 0 mm to 2 mm.The critical kinetic energy of molten bead is 0.12×10^(-4) J.When the welding distance is determined,the igniting ability increases with the increase of current.When the loading current is constant,the igniting ability becomes weaker with the increase of the welding distance.Through the analysis of the above factors and the use of Logistic regression model,the ignition probability model of PUR is established.The verification shows that the prediction accuracy of this model is high,and the probability of ignition of PUR insulation materials by electric welding beads can be preliminarily predicted.
作者
申晓毓
张树川
赵宗玉
Shen Xiaoyu;Zhang Shuchuan;Zhao Zongyu(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan Anhui 232001,China)
出处
《消防科学与技术》
北大核心
2026年第2期67-72,共6页
Fire Science and Technology
基金
安徽省省级研究生线上线下混合示范课程(2022hhsfkc021)。
关键词
电焊熔珠
保温材料
引燃概率
引燃能力
聚氨酯板
welding bead
insulation material
ignition probability
ignition capacity
polyurethane board
