PSI - Issue 33

Rizki Dwi Ardika et al. / Procedia Structural Integrity 33 (2021) 171–180 Author name / Structural Integrity Procedia 00 (2019) 000–000

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9. Conclusion Aluminum alloy welding has been widely used. The welding process commonly used is arc welding, such as GMAW and GTAW. Arc welding is used more frequently because the area is subjected to less heat so that the heat is applied more in focus, and the speed of welding can be increased. The emergence of welding processes such as CMT can provide many advantages. Among others, it can produce a low heat input resulting in less spark during the welding process. In the welding process, the welding defect that often arises is the porosity of the weld joint. The form of porosity in the weld joint is usually in the form of macroporosity and microporosity. Macroporostity generally has a bigger shape than microporosity. The formation of porosity is generally caused by dissolved hydrogen in the weld metal, air/bubbles from the welding process, filler/filler wire, and the influence of the environment around the welding. Environmental factors that influence porosity are erratic air temperature and high humidity. The impact of porosity can cause cracks in the weld joint, decreased ductility, and fatigue failure. However, porosity can be prevented by setting the appropriate speed parameters at the time of welding, optimal welding conditions, suitable welding ranges, and maintaining environmental control. Acknowledgements Authors would like to thank a lot to University of Sebelas Maret Surakarta, Indonesia, for providing many facilities and financially supporting through the Penelitian Unggulan Terapan UNS (PUT-UNS) 2021 grant with Contract No. 260/UN27.22/HK.07.00/2021. Ahsan, M. R. U., Kim, Y. R., Kim, C. H., Kim, J. W., Ashiri, R., & Park, Y. D. (2016). Porosity formation mechanisms in cold metal transfer (CMT) gas metal arc welding (GMAW) of zinc coated steels. Science and Technology of Welding and Joining , 21 (3), 209–215. https://doi.org/10.1179/1362171815Y.0000000084 Ambriz, R. 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