Production of Ultrasonic Test Piece by Utilization of Additive Manufacturing Technique
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COUSTIC METHODS
Production of Ultrasonic Test Piece by Utilization of Additive Manufacturing Technique M. Riahia, * and H. R. Javidradb, ** aProfessor,
Department of Manufacturing Engineering, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, 16557 Iran b Department of Mechanical Engineering, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, 16557 Iran *e-mail: [email protected] **e-mail: [email protected] Received June 4, 2020; revised July 17, 2020; accepted July 24, 2020
Abstract—Test pieces are principal elements in the utilization of ultrasonic testing equipment. This is particularly evident when testing takes place for parts produced by additive manufacturing (AM) processes. In light of common defects in these types of parts, e.g. gas and powder cavities, lack of fusion, etc., as well as differences in the forming mechanism compared to parts produced via conventional methods, the existing test pieces are not responsive to the required scrutiny needed for the procedure. In this paper, the overall procedure for the manufacturing of a test block by additive manufacturing selective laser melting (SLM) process is presented. Cross-cutting of the manufactured part took place followed by measuring embedded defects’ characteristics by microscope. In addition, the distance of defects from the outer surfaces was also measured by a micrometer. The produced data was indicative of affirmation of findings in terms of dimensional precision and accuracy. As a result, the manufactured test block was found to be reliable and acceptable. Keywords: nondestructive testing, additive manufacturing, calibration blocks, precision measurement DOI: 10.1134/S106183092010006X
1. INTRODUCTION Additive manufacturing (AM) is referred to as processes in which a part is made layer by layer directly from a computer model. As research has developed in different areas of additive manufacturing, this technology has gained a special status in the defense industry and medical applications [1, 2]. AM has provided the possibility of producing geometrically complex parts where traditional processes could not produce. This point has contributed enormously to the advancement of the manufacturing process procedures resulting in the reduction of the materials used [3, 4]. Several methods of AM are in use. A common method is called selective laser melting (SLM). In order to produce high-quality parts by the SLM technique, a host of parameters has to be considered to produce desired structural and mechanical characteristics. When these parameters are neglected, defects such as gas porosity, cracks, and unfused powder would occur. This being the case, results in a negative impact on the mechanical characteristics of the part and hence, lack of its suitability in the industry subsidies [5]. Consequently, the produced parts need to go through cyclic tests in addition to being tested at the time of production. Quality control and mechanical performance of the produc
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