微量元素降低焊缝扩散氢含量的机理探讨

INVESTIGATION ON THE MECHANISM OF REDUCING DIFFUSIBLE HYDROGEN IN WELD USING MICROELEMENTS

采用熔池添加合金过渡法（简称熔池法）研究微量元素Ｙ和Ｔｅ对焊缝扩散氢含量的影响，结果表明，熔池法过渡微量元素的降氢效果显著，降氢机理为：Ｙ和Ｔｅ均属表面活性元素，能改变熔池液态金属的表面性质，减少表面对电弧空间氢原子的吸附，使焊缝金属扩散氢含量降低．

n this paper, the influence of microelements yttrium (Y) and tellurium (Te) on the diffusible hydrogen in weld bead has been investigated in a systemic way by means of alloying addition in the molten pool (AAMP). The results indicate that AAMP can notably reduce the diffusible hydrogen, economize the precious microelements and improve the technological properties. J Thus the microelemets will play an important role in further developing the welding materials and welding engineering practice. This paper lays emphasis on the discussion of the mechanism of reducing hydrogen by microelements Y and Te. It is considered from the results that both Y and Te belong to surface active elements and can reduce the diffusible hydrogen in weld bead because they can change the surface properties of molten pool metal and reduce the absorption of hydrogen atom in arc space of liquid metal surface. This research has a great significance in the development and utilization of microelements in welding.