摘要
Abstract
The relationship between the basic coating composition involved in the metallurgical reaction and hydrogen diffusion in the weld metal was reviewed.The results show that the dehydrogenation metallurgical reaction in the arc by adding carbonate containing CaCO3,fluoride(such as CaF2,NaF)and other additives which can be decomposed into oxides at high temperature in the coating of the basic electrode reduces the hydrogen partial pressure PH2 in the arc atmosphere,which is beneficial to the reduction of hydrogen content in the weld metal.The composition of the coating with the good dehydrogenation effect and its addition amount are respectively:calcite(CaCO3)18%,fluorite 22%,sodium fluoride 8.9%,SiO213.1%,potassium fluotitanate(K2TiF6)2.1%,and micaceous iron oxide(Fe2O3)16.3%.With the great increase of the coating composition,the diffused hydrogen content in the weld has the different changes,but there is a region where the diffusion hydrogen content decreases.The control principle of the hydrogen diffusion in the weld metal based on metallurgical reactions is essentially to reduce the hydrogen partial pressure PH2 in the arc.When adding the dehydrogenation components,it is also necessary to consider the usability of the electrode and the mechanical properties of the deposited metal.关键词
扩散氢/焊缝金属/冶金反应/焊条电弧焊/药皮组成物Key words
diffused hydrogen/weld metal/metallurgical reaction/shielded metal arc welding/coating composition分类
金属材料
