BS EN ISO 21904-3:2018定义了一种测量ontorch焊接烟尘捕集效率的实验室方法 提取系统。该程序只规定了一种方法，留下了测试的选择 参数，以便可以评估不同变量的效果。它适用于集成在火炬上的系统，也适用于使用离散萃取系统的系统 连接在靠近电弧区域的焊炬上。该方法适用于所有情况 连续焊丝焊接工艺，所有材料类型和所有焊接参数。该方法可用于评价萃取流量、萃取喷嘴等变量的影响 位置、保护气体流量、焊接几何形状、焊炬角度、烟气排放率等 捕获效率。交叉引用:ISO 15767ISO/IEC指南98（所有部分）ISO 6947ISO 15011（所有部分）ISO 5167-1ISO 3966CEN/TR 16013-1购买本文件时提供的所有现行修订版均包含在购买本文件中。

BS EN ISO 21904-3:2018 defines a laboratory method for measuring the welding fume capture efficiency of ontorch extraction systems. The procedure only prescribes a methodology, leaving selection of the test parameters to the user, so that the effect of different variables can be evaluated.It is applicable to integrated on-torch systems and to systems where a discrete extraction system is attached to the welding torch close to the arc area. The methodology is suitable for use with all continuous wire welding processes, all material types and all welding parameters.The method can be used to evaluate the effects of variables such as extraction flow rate, extract nozzle position, shielding gas flow rate, welding geometry, welding torch angle, fume emission rate, etc., on capture efficiency.Cross References:ISO 15767ISO/IEC Guide 98 (all parts)ISO 6947ISO 15011 (all parts)ISO 5167-1ISO 3966CEN/TR 16013-1All current amendments available at time of purchase are included with the purchase of this document.