Effect of CaCO<sub>3</sub> Content on Slag Detachability of Self-shielded Flux-Cored Wire

LI Jihong; CHENG Kangkang; SHU Shaoyan; HE Xiaoyu; LI Le; ZHANG Min

doi:10.11973/jxgccl201809002

Materials and Mechanical Engineering > 2018 > 42(9): 6-10. > DOI: 10.11973/jxgccl201809002

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 and Mechanical Engineering, 2018, 42(9): 6-10. DOI: 10.11973/jxgccl201809002

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Effect of CaCO₃ Content on Slag Detachability of Self-shielded Flux-Cored Wire

College of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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Received Date: July 13, 2017
Revised Date: July 08, 2018

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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.
- self-shielded flux-cored wire,
- slag,
- slag detachability,
- microstructure,
- phase composition

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Effect of CaCO3 Content on Slag Detachability of Self-shielded Flux-Cored Wire

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Effect of CaCO₃ Content on Slag Detachability of Self-shielded Flux-Cored Wire