Determination of La/CeO2 content in ilmenite electrode coating

The ilmenite welding electrode has advantages of low cost and excellent welding technological properties. However, the welding quality is affected adversely by its poor crack resistance. To solve this problem, 12 kinds of rare earths coating formulas were optimized by means of orthogonal test design and curve fitting. Then the powders containing La/CeO2 were extruded into ilmenite welding electrode through screw-type pressing–scribbling machine. After that, a series of mechanical properties tests were conducted according to national standards. Next, the mechanical properties data were analyzed comprehensively by analyzing variance, boxplot as well as Minitab 3D surface chart. The results show that compared with the formula without rare earth, the deposited metal’s impact toughness, the lower yield strength, the tensile strength, and the hardness are increased by 54.44 %, 9.25 %, 6.37 %, and 4.27 %, respectively. In other words, Electrode 6 with the La/CeO2 amount of 0.5 %/0.1 % in coating has better mechanical properties.