Effects of welding heat and travel speed on the impact property and microstructure of FC welds

• Published in: Metals and materials international Vol. 16; no. 5; pp. 827 - 832
• Main Authors: Lee, Jeong Soo, Jeong, Sang Hoon, Lim, Dong Yong, Yun, Jin Oh, Kim, Myung Hyun
• Format: Journal Article
• Language: English
• Published: Springer The Korean Institute of Metals and Materials 01.10.2010; Springer Nature B.V; 대한금속·재료학회
• Subjects: Characterization and Evaluation of Materials; Charpy impact test; Chemistry and Materials Science; Cooling; Cooling rate; Electric potential; Electrodes; Engineering Thermodynamics; Flux; Grain growth; Heat and Mass Transfer; Heat treating; Impact analysis; Impact tests; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Metallurgy; Microstructure; Numerical analysis; Processes; Solid Mechanics; Voltage; Welded joints; Welding; Welding fluxes; 재료공학; metals; welding; microstructure; numerical temperature analysis; impact test
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-010-1021-8

This paper is concerned with the effects of welding heat (current x voltage = W) and travel speed (v) on the impact property and microstructure of FC (flux cored) welds. Two sets of plate were welded under different welding conditions such as higher W, v and lower W, v, while maintaining identical heat input. We evaluated the effects of each factor by Charpy impact test and observation of the microstructure, and then compared these data with the results of the numerical temperature analysis. The size of the re-heated zone was increased as the v value decreased, and the results of numerical analysis also revealed the same tendency. Cooling rate of welds (both of as-welded and re-heated zones) decreased as the W value increased. Despite identical heat input conditions, the use of lower W and v made the microstructure finer and increased the volume fraction of AF, thereby leading to a substantial improvement of the impact property.