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《Materials for Mechanical Engineering》 2018-09
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Effect of CaCO_3 Content on Slag Detachability of Self-shielded Flux-Cored Wire

LI Jihong;CHENG Kangkang;SHU Shaoyan;HE Xiaoyu;LI Le;ZHANG Min;College of Materials Science and Engineering,Xi′an University of Technology;  
Self-shielded flux-cored wires with 1 wt%,3 wt%,5 wt% and 7 wt% CaCO_3 were prepared,and then used to weld ultra-low carbon bainitic steels.The effects of CaCO_3 content on the micromorphology,phase composition and slag detachability of slag after welding were studied.The results show that with the increase of CaCO_3 content,the micromorphology of internal surface of slag changed from massive to rod-like,then to dendritic,and finally to granular.When CaCO_3 content was 1 wt% and 3 wt%,the slag was composed of composite oxide of BaO and TiO2(BaTiO3),spinel compound(MgMn_2O_4 or MnAl_2O_4)and BaMg3 Al2 Si2 O10 F2 composite oxyfluoride.When CaCO_3 content was improved to 5% and 7%,respectively,the BaMg_3Al_2Si_2O_(10)F_2 phase disappeared and Ca_2SiO_4 phase formed.With the increase of CaCO_3 content in the flux-cored wire,the slag detachability decreased.
【Fund】: 国家自然科学基金资助项目(51274162);; 陕西省协同创新计划项目(2015XT-39);; 陕西省教育厅重点实验室项目(15JS082)
【CateGory Index】: TG422.3
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