Ductility of Welded Joints in CK45 Carbon Steel
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DUCTILITY OF WELDED JOINTS IN CK45 CARBON STEEL H. R. Ghazvinloo1,2 and A. Honarbakhsh-Raouf1 The procedure of gas-metal arc welding (GMAW) has received much attention in recent years and has numerous beneficial applications in the industry, including car industry and ship building. It is expected that the GMAW parameters, such as arc voltage, welding current and welding speed, strongly affect the mechanical properties of welded joints. As one of the most important mechanical properties that should be taken into account by designers, we can mention the ductility of welded joint, which can be found as a result of bending tests. Thus, we perform the experimental investigation with an aim to determine the effect of the parameters of robotic GMAW on the ductility of welded joints in CK45 carbon steel. The accumulated results clearly illustrate that the ductility of welded joints is a monotonic function of the welding parameters. Keywords: Gas-metal arc welding, welding variables, ductility, welded joint.
Introduction Welding is one of the most applicable connection processes in the industry [1]. Among numerous types of welding processes, the procedure of gas-metal arc welding (GMAW) proves to be preferable method for a broad range of ferrous and nonferrous metal products [2, 3] due to its high deposition efficiency, better quality of welding [4, 5], low cost and high efficiency of the process of joining [6], high speed [7], and high productivity rate [8]. In this process, the heat required to melt metals is generated by an electric arc formed between a continuous wire electrode and a weld pool. Gases, such as carbon dioxide ( CO 2 ), argon (Ar), helium (He), and their combinations, are used to protect the weld pool. In general, the GMAW process with gaseous CO 2 offers a cost-efficient performance as compared with other gases [9]. The automatic GMAW systems have multiple inputs, outputs, variables, and performance [10]. The arc voltage, welding current, and welding speed are three important parameters of GMAW, which may strongly affect the mechanical properties of the welded joint. The ductility of the welded joint is one of the most important factors that should be taken into account in the design of welded structures. As far as we know, relatively little information is available on the mechanical properties of welded joints in medium-carbon steels. In the proposed research work, we make an attempt to study the effect of the parameters of robotic GMAW on the ductility of welded joints in CK45 carbon steel. Materials and Methods An SOS Model DR Series ARK ROBO-1500 welding robot was used to realize the automatic multi-pass gas-metal arc welding process. Its key variables for the present study were the arc voltage, the welding current, 1 2
Department of Materials Engineering, Semnan University, Semnan, Iran. Corresponding author; e-mail: [email protected].
Published in Fizyko-Khimichna Mekhanika Materialiv, Vol. 56, No. 3, pp. 66–69, May–June, 2020. Original article submitted July 30, 2019. 1068-820X/20/5603–0
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