Abstract
This paper presents an experimental study that examines variations of Charpy impact energy of a welded steel plate, depending upon the welding method and the method for obtaining the Charpy specimens. Flux cored arc welding (FCAW) and Gas tungsten arc welding (GTAW) were employed to weld an SA516 Gr. 70 steel plate. The methods of wire cutting and water-jet cutting were adopted to take samples from the welded plate. The samples were machined according to the recommendations of ASTM SEC. II SA370, in order to fit the specimen dimension that the Charpy impact test requires. An X-ray diffraction (XRD) method was used to measure the as-weld residual stress and its redistribution after the samples were cut. The Charpy impact energy of specimens was considerably dependent on the cutting methods and locations in the welded plate where the specimens were taken. The specimens that were cut by water jet followed by FCAW have the greatest resistance-to-fracture (Charpy impact energy). Regardless of which welding method was used, redistributed transverse residual stress becomes compressive when the specimens are prepared using water-jet cutting. Meanwhile, redistributed transverse residual stress becomes tensile when the specimens are prepared using wire cutting.
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Recommended by Associate Editor Choon Yeol Lee
Zhaorui Yang received the B.S. in Mechanical Engineering from Kongju National University, Korea, in 2010. He then received the M.S. and Ph.D. degrees from Chung-Ang University, Seoul, Korea, in 2012 and 2016, respectively. His research interests include the finite element analysis and experiment of variations in the crack propagation direction and path in the welded joints of gas pipes. He is also interested in the warm shot peening process.
Youngseog Lee received the B.S. in Mechanical Engineering from Pusan National University, Korea, in 1989. He then received the M.S. and Ph.D. degrees from Case Western Reserve University, Cleveland, Ohio, USA, in 1992 and 1997, respectively. Until 2003, he worked as a researcher at POSCO Technical Research Laboratories, Pohang, Korea. He is currently a Professor in the Department of Mechanical Engineering, Chung-Ang University, Seoul, Korea. He is interested in numerical analysis of variations in the crack propagation direction and path of the welded joints of gas pipes.
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Yang, Z., Kang, H. & Lee, Y. Experimental study on variations in charpy impact energies of low carbon steel, depending on welding and specimen cutting method. J Mech Sci Technol 30, 2019–2028 (2016). https://doi.org/10.1007/s12206-016-0408-y
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DOI: https://doi.org/10.1007/s12206-016-0408-y