TiO2对水下湿法焊接熔渣形貌及微观组织的影响

文中采用自制的金红石型碳钢焊条进行水下湿法焊接，重点分析了药皮中TiO₂的加入量对熔渣形貌及微观组织结构的影响.由熔渣的成分及物相分析得出，熔渣的主要组成相为Fe₂MnTi₃O₁₀，还含有少量的Ca₂SiO₄和自由氧化物.对熔渣的宏观形貌及微观组织结构分析发现，当药皮中TiO₂加入量较大时，熔渣致密松脆，熔渣的微观组织中灰白色条状相粗大，有利于熔渣脱渣；当减小TiO₂的加入量，增大CaCO₃的加入量时，熔渣变得松散，出现粘渣现象，此时微观组织中的灰白色条状相变得细小，不利于熔渣脱渣.

Effect of addition amount of TiO2 on morphology and microstructure of slag during underwater wet welding

In this paper, the autonomous rutile type carbon steel electrode was used for underwater wet welding. It focused on the effect of the addition amount of TiO₂ in the coated on the morphology and microstructure of slag. By composition and phase analysis of slag, the main phase of slag was Fe₂MnTi₃O₁₀, and it also contained a small amount of Ca₂SiO₄ and free oxides. By morphology and microstructure analysis of slag, it found that when the addition amount of TiO₂ was larger, the slag was compact. Furthermore, the gray stripe phase in the microstructure of slag was bulky, which was advantageous to the detachability of slag. With the decrease of addition amount of TiO₂ and increase of addition amount of CaCO₃, the slag became loose and viscous slag occurred. Meanwhile, the gray stripe phase in the microstructure changed thin, which was not advantageous to the detachability of slag.