一种新型甘油法扩散氢测试技术研究

A new technology for measuring diffusion hydrogen by glycerol method

根据相关标准,扩散氢的测试方法主要有甘油法、水银法、气相色谱法和热置换法四种。其中,甘油法的应用最普遍,使用时间最长,测试成本最低,安全性最好,因此长期在标准中得到应用。但是,甘油法的测试精度较低,特别是超低氢情况下,更是很难满足要求。最新的国家标准已经不推荐使用。在天津大学排液法基础上进行结构优化改进,从而研发了一种新型甘油法扩散氢测试技术。通过与国内通用设备KQ-3型甘油法扩散氢测量装置进行实验对比,测试结果表明,在焊条电弧焊中使用碱性焊条E5015(天津大桥),测量精度比KQ-3型设备高24%~28%,使用CO_(2)气体保护焊时,测量精度高28%,使用氩弧焊时,测量精度高28.7%。

According to relevant standards,there are four main testing methods for diffusive hydrogen:glycerol method,mercury method,gas chromatography method and thermal displacement method.Among them,glycerol method has the characteristics of the most common application,the longest use time,the lowest test cost and the best safety,so it has been applied in the standard for a long time.However,the accuracy of glycerol method is low,especially in the case of ultra-low hydrogen,it is difficult to meet the requirements.The latest national standards are no longer recommended.Based on the discharging method of Tianjin University,a new diffusive hydrogen testing technology by glycerol method was realized through structural optimization and improvement.The results show that the precision of alkaline electrode E5015(Tianjin Bridge)used in electrode arc welding is 24%~28%higher than that of KQ-3 equipment,28%higher than that of CO_(2) gas shielded welding and 28.7%higher than that of argon arc welding.