CaCO3含量对自保护药芯焊丝脱渣性的影响
Effect of CaCO3 Content on Slag Detachability of Self-shielded Flux-Cored Wire
摘 要
制备了CaCO3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CaCO3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CaCO3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CaCO3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（MgMn2O4或MnAl2O4）和BaMg3Al2Si2O10F2复合氟氧化物，当CaCO3含量增至5%，7%时，BaMg3Al2Si2O10F2相消失，出现了Ca2SiO4相；随着药芯焊丝中CaCO3含量的增加，脱渣性下降。
熔渣
脱渣性
微观结构
物相组成
self-shielded flux-cored wire
slag
slag detachability
microstructure
phase composition
Abstract
Self-shielded flux-cored wires with 1wt%, 3wt%, 5wt% and 7wt% 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 1wt% and 3wt%, the slag was composed of composite oxide of BaO and TiO2 (BaTiO3), spinel compound (MgMn2O4 or MnAl2O4) and BaMg3Al2Si2O10F2 composite oxyfluoride. When CaCO3 content was improved to 5% and 7%, respectively, the BaMg3Al2Si2O10F2 phase disappeared and Ca2SiO4 phase formed. With the increase of CaCO3 content in the flux-cored wire, the slag detachability decreased.
中图分类号 TG422.3 DOI 10.11973/jxgccl201809002
所属栏目 试验研究
基金项目 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）
收稿日期 2017/7/14
修改稿日期 2018/7/9
网络出版日期
作者单位点击查看
备注李继红(1973-),男,河南洛阳人,副教授,博士
引用该论文: LI Jihong,CHENG Kangkang,SHU Shaoyan,HE Xiaoyu,LI Le,ZHANG Min. Effect of CaCO3 Content on Slag Detachability of Self-shielded Flux-Cored Wire[J]. Materials for mechancial engineering, 2018, 42(9): 6～10
李继红,程康康,舒绍燕,何晓宇,李乐,张敏. CaCO3含量对自保护药芯焊丝脱渣性的影响[J]. 机械工程材料, 2018, 42(9): 6～10
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参考文献
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【2】KANG J, LI C N, YUAN G, et al. Improvement of strength and toughness for hot rolled low-carbon bainitic steel via grain refinement and crystallographic texture[J]. Materials Letters, 2016, 175:157-160.
【3】ZENG H, WANG C, YANG X, et al. Automatic welding technologies for long-distance pipelines by use of all-position self-shielded flux cored wires[J]. Natural Gas Industry B, 2014, 1(1):113-118.
【4】POKHODNYA I K, DUBOVETSKY V Y, SHLEPAKOV V N, et al. Resources-saving technology of position automatic flux-cored wire welding of gas pipelines with a forced weld formation[M]//Welding in Energy Related Projects.[S.l.]:[s.n.],1983:133-139.
【5】张占伟, 李午申, 薛振奎,等. CeO2对自保护药芯焊丝性能的影响[J]. 天津大学学报, 2009, 42(6):502-506.
【6】赵雁潮, 魏琪, 栗卓新, 等. 保护气体对含铌不锈钢药芯焊丝347L脱渣性的影响J]. 焊接学报, 2006, 27(11):77-80.
【7】YANG L L, WANG H M, ZHU X, et al. Effect of boron mud and CaF2 on surface tension and density of CaO-SiO2-B2O3 ternary slag systems[J]. Journal of Iron and Steel Research, International, 2014, 21(8):745-748.
【8】李继红, 郑雯, 陈飞绸, 等. X100管线钢烧结焊剂熔渣结构对焊接脱渣性的影响[J]. 兵器材料科学与工程, 2013, 36(1):29-31.
【9】栗卓新, 陈邦固, 雷万钧, 等. 药芯组成对碱性自保护药芯焊丝脱渣性影响的研究[J]. 机械工程学报,2001,37(10):75-78.
【10】易江龙,王昕昕,王凯,等. 渣系成分对高强钢气保护药芯焊丝脱渣性影响的研究[J]. 焊接技术, 2016, 45(6):60-63.
【11】WANG D, LI X, WANG H, et al. Dissolution rate and mechanism of solid MgO particles in synthetic ladle slags[J]. Journal of Non-Crystalline Solids, 2012, 358(9):1196-1201.
【12】陈伯蠡. 焊接冶金原理[M]. 北京:清华大学出版社, 1991.
【13】KIM J B,CHOI J K, HAN I W, et al. High-temperature wettability and structure of the TiO2-MnO-SiO2-Al2O3 welding flux system[J]. Journal of Non-Crystalline Solids, 2016, 432:218-226.
【14】李平, 孟工戈. TiO2对不锈钢焊条脱渣性的影响[J]. 焊接学报, 2006, 27(4):69-72.
【15】余永宁. 金属学原理[M]. 北京:冶金工业出版社,2000.
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