Formation Mechanism of Inclusion in

Formation Mechanism of Inclusion in Self-Shielded Flux Cored Arc Welds

The formation mechanism of inclusion in welds with different aluminum contents was determined based on thermodynamic equilibrium in self-shielded flux cored arc welds. Inclusions in welds were systematically studied by optical microscopy, scanning microscopy and image analyzer. The results show that the average size and the contamination rate of inclusions in low-aluminum weld are lower than those in high-aluminum weld. Highly faceted AlN inclusions with big size in the high-aluminum weld are more than those in low-aluminum weld. As a result,the low temperature impact toughness of low-aluminum weld is higher than that of high-aluminum weld. Finally,the thermodynamic analysis indicates that thermodynamic result agrees with the experimental data.

作 者： YU Ping LU Xiao-sheng Pan Chuan XUE Jin LI Zheng-bang   作者单位： YU Ping,XUE Jin(Xi'an Jiaotong University, Xi'an 710049,China)

LU Xiao-sheng(Luoyang Ship Material Research Institute, Luoyang 471003,China)

Pan Chuan,LI Zheng-bang(Central Iron and Steel Research Institute, Beijing 100081,China) 

刊 名： 钢铁研究学报（英文版）  SCI 英文刊名： JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL  年，卷(期)： 2005 12(1)  分类号：   关键词： inclusion   oxide   nitride   self-shielded flux cored arc welding   impact toughness   thermodynamic analysis  

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