Abstract：The determination method of sulfur in welding flux (including soldering flux, electrode covering and flux-cored wire powder) by high frequency induction combustion infrared absorption was studied. The optimum working conditions were obtained as below: 0.10-0.15g of sample was transferred into porcelain crucible containing 0.3-0.5g of scrap iron, and then covered by 0.2g of tin particles and 1.7g of tungsten particles; the standard curve was established using 0.3-0.5g of certified reference materials of steel (the flux was 0.2g of tin particles+1.7g of tungsten particles). The results showed that the lower determination limit of method was 0.005% (high-purity oxygen)-0.008% (normal oxygen). The experimental method was applied for the analysis of actual welding flux samples with different sulfur contents. The relative standard deviations (RSD, n=6) were less than 7%, and the recoveries were between 83% and 107%. The accuracy was verified using standard samples of welding flux and ore, and the found results were consistent with the certified values.
刘攀, 唐伟. 高频感应燃烧红外吸收法测定焊接药剂中硫含量[J]. 冶金分析, 2017, 37(11): 64-68.
LIU Pan, TANG Wei. Determination of sulfur in welding flux by high frequency induction combustion infrared absorption method. , 2017, 37(11): 64-68.
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