CaCO_3含量对自保护药芯焊丝脱渣性的影响  

Effect of CaCO_3 Content on Slag Detachability of Self-shielded Flux-Cored Wire

作　　者：李继红[1] 程康康 舒绍燕 何晓宇 李乐 张敏[1] LI Jihong;CHENG Kangkang;SHU Shaoyan;HE Xiaoyu;LI Le;ZHANG Min(College of Materials Science and Engineering,Xi＇an University of Technology,Xi＇an 710048,China)

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《机械工程材料》2018年第9期6-10,共5页Materials For Mechanical Engineering

基　　金：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)

摘　　要：制备了CaCO_3质量分数分别为1%,3%,5%,7%的自保护药芯焊丝,并对超低碳贝氏体钢进行了焊接,研究了CaCO_3含量对焊后熔渣的微观形貌、物相组成和脱渣性的影响。结果表明:随着药芯焊丝中CaCO_3含量的增加,熔渣内表面的微观形貌由块状变为棒束状,再转变为树枝晶状,最后变为颗粒状;当CaCO_3含量(质量分数,下同)为1%,3%时,熔渣的主要物相为由BaO和TiO2组成的复合氧化物(BaTiO3)、尖晶石型化合物(MgMn_2O_4或MnAl_2O_4)和BaMg_3Al_2Si_2O_(10)F_2复合氟氧化物,当CaCO_3含量增至5%,7%时,BaMg_3Al_2Si_2O_(10)F_2相消失,出现了Ca_2SiO_4相;随着药芯焊丝中CaCO_3含量的增加,脱渣性下降。Self-shielded flux-cored wires with 1 wt%,3 wt%,5 wt% and 7 wt% CaCO3 were prepared,and then used to weld ultra-low carbon bainitic steels.The effects of CaCO3 content on the micromorphology,phase composition and slag detachability of slag after welding were studied.The results show that with the increase of CaCO3 content,the micromorphology of internal surface of slag changed from massive to rod-like,then to dendritic,and finally to granular.When CaCO3 content was 1 wt% and 3 wt%,the slag was composed of composite oxide of BaO and TiO2（BaTiO3）,spinel compound（MgMn2O4 or MnAl2O4）and BaMg3 Al2 Si2 O10 F2 composite oxyfluoride.When CaCO3 content was improved to 5% and 7%,respectively,the BaMg3Al2Si2O（10）F2 phase disappeared and Ca2SiO4 phase formed.With the increase of CaCO3 content in the flux-cored wire,the slag detachability decreased.

关 键 词：自保护药芯焊丝 熔渣 脱渣性 微观结构 物相组成 

分 类 号：TG422.3[金属学及工艺—焊接]