Method for diffusible hydrogen analysis in welding materials by gas chromatography

Abstract

A new method was developed by gas chromatography for diffusible hydrogen analysis in E-7018 ordinary electrodes, using a packed column and nitrogen as reference and carrier gas. The method includes two thermal treatments to the weld pieces, before and after the welding process. The quantitative analysis was made using the external standard method. The method is selective, and the linearity is adequate between 0-20 μL of hydrogen, with a dynamic range between 0,69-17,28 μL. The correlation coefficient higher than 0,99 in all cases indicate good correlation. The accuracy has a mean value of 99,46%. The detection and quantification limits have values adequate to our aims. There were found differences between both methods, glycerine and gas chromatography. The developed and proposed method can be used for routine analysis of hydrogen in welding materials using E-7018 electrodes.

Keywords

• E-7018 electrodes
• welding
• diffusible hydrogen