Metal Inert Gas Welding-Based-Shaped Metal Deposition in Additive Layered Manufacturing: A Review
Shaped Metal Deposition (SMD) in additive layered manufacturing technique is a promising alternative to traditional manufacturing used for manufacturing large, expensive metal components with complex geometry in addition to producing free structures by building materials in a layer by layer technique. The present paper is a comprehensive review of the literature and the latest rapid manufacturing technologies of the SMD technique. The aim of this paper is to comprehensively review the most prominent facts that researchers have dealt with in the SMD techniques especially those associated with the cold wire feed. The intent of this study is to review the literature presented on metal deposition processes and their classifications, including SMD process using Wire + Arc Additive Manufacturing (WAAM) which divides into wire + tungsten inert gas (TIG), metal inert gas (MIG), or plasma. This literary research presented covers extensive details on bead geometry, process parameters and heat input or arc energy resulting from the deposition process in both cases MIG and Tandem-MIG in SMD process. Furthermore, SMD may be done using Single Wire-MIG (SW-MIG) welding and SMD using Double Wire-MIG (DW-MIG) welding. The present review shows that the method of deposition of metals when using the DW-MIG process can be considered a distinctive and low-cost method to produce large metal components due to high deposition rates as well as reduce the input of high temperature generated during deposition and reduce the distortions. However, the accuracy and surface finish of the MIG-SMD are less as compared to electron and laser beam.
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 Baufeld, B., Biest, O.V.D., Gault, R., 2010. Additive manufacturing of Ti-6Al-4V components by shaped metal deposition: microstructure and mechanical properties. Mater. Des. 31, S106-S111.W.-K. Chen, Linear Networks and Systems (Book style). Belmont, CA: Wadsworth, 1993, pp. 123–135.
 Huang, R.Z., Riddle, M., Graziano, D., Warren, J., Das, S., Nimbalkar, S., Cresko, J., Masanet, E., 2016. Energy and emissions saving potential of additive manufacturing: the case of lightweight aircraft components. J. Clean Prod. 135, 1559-1570.
 Gebhardt A. (2011). Understanding additive manufacturing, rapid prototyping, rapid tooling, rapid manufacturing, 1st edition, Carl Hasner Verlag, Munich- Germany.
 Antonysamy AA. (2012). Microstructure, texture, and mechanical properties evolution during additive manufacturing of Ti6Al4V alloy for aerospace applications. University of Manchester, Ph.D. thesis.
 Buckner, M.A., Lonnie, J.L. (2012). Automating and accelerating the additive manufacturing design process with multi-objective constrained evolutionary optimization and HPC/Cloud computing. In: Proceedings of the 2012 IEEE Int Conf on Future of Instrumentation International Workshop (FIIW). Gatlinburg, NT, USA, 8-9October, pp. 1-4.
 Wohlers T, Gornet T (2014) History of additive manufacturing. Wohlers Report. http://wohlersassociates.com/history2014.pdf
 Jacobs PF (1992) Rapid prototyping & manufacturing fundamentals of stereolithography. Society of Manufacturing Engineers, Dearborn. First edition. US
 Sachs E et al (1990) Three-dimensional printing: rapid tooling and prototypes directly from a CAD model. CIRPAnn Manuf Technol 39:201–204
 Mahmood, R.M., Akinlabi, E.T., Shukla, M., Pityana, S. (2013). Laser Metal Deposition of Ti6Al4V: A Study on the Effect of Laser Power on Microstructure and Microhardness In: Proceedings of the International Multi Conference of Engineers and comp Scientists, IMECS 2013, March 13-15, Hong Kong, Volume 11.
 Klahn, C., Leutenecker, B., Meboldt, M. (2014). Design for Additive Manufacturing-Supporting the Substitution of Components in Series Products, in Proceedings of the 14th CIRP Design Conference, 21:138-143. Available online at www.sciencedirect.com
 Levy GN et al (2003) Rapid manufacturing and rapid tooling with layer manufacturing (LM) technologies, state of the art and future perspectives. CIRPAnn Manuf Technol 52:589–609
 Wohlers, T. (2009). Wohlers report 2009, State of the industry, Annual worldwide progress report, Wohlers.
 Ding, D., Pan, Z., Cuiuri, D., & Li, H. (2015). Wire-feed additive manufacturing of metal components: technologies, developments, and future interests. The International Journal of Advanced Manufacturing Technology, 81 (1-4), 465-481.
 J. Alcisto, A. Enriquez, H. Garcia, S. Hinkson, T. Steelman, E. Silverman, P. Valdovino, H. Gigerenzer, J. Foyos, J. Ogren, J. Dorey, K. Karg, T. McDonald, and O.S. Es-Said, Tensile Properties and Microstructures of Laser-Formed Ti-6Al-4V, JMEP, 2011, 20 (2), p 203–212
 ASTM F2792-12 A Standard Terminology for Additive Manufacturing Technologies, doi: 10.1520/F279-12A.
 VDI 3404 (2014). Additive Manufacturing: Basics, Definitions, Processes.
 D.L. Bourell, M.C. Leu, and D.W. Rosen, Ed., Roadmap for Additive Manufacturing, the University of Texas at Austin, Austin TX, 2009
 Gibson, I., Rosen, D., Stucker, B. (2010). Additive manufacturing technologies, Second Edition, Springer, New York, Heidelberg Dordrecht, London, do: 10.1007/978-1-4939-2113-3.
 Tofail, S. A., Koumoulos, E. P., Bandyopadhyay, A., Bose, S., O’Donoghue, L., & Charitidis, C. (2017). Additive manufacturing: scientific and technological
 Van Niekerk G.J. (2007). A model for transparent data exchanging in layered manufacturing. Faculty of Science – the University of Johannesburg, Ph.D. thesis.
 Griffith, M.L., Ensz, M.T., Puskar, J.D., Robino, C.V. (2000). Brooks, J.A., Philliber, J. A, et al. Understanding the microstructure and properties of components fabricated by laser engineered net shaping (LENS). In: Proceedings of MRS Spring Meeting Conference; San Francisco, CA, US, 24-27 April.
 Zhang, K., Liu, W., Shang, X. (2009). Study on scanning pattern during laser metal deposition shaping. In: Proceedings of the 2009 IEEE Second IntConfon Intelligent Computation Techn and Auto; Changsha, Hunan, 10-11 October, 4, 668-671.
 Jardini, A.L., Larosa, M.A., Bernardes, L.F., Zavaglia, C.A.C., Maciel F. R. (2011). Application of direct metal laser sintering in titanium alloy for cranioplasty. 6th BRAZILIAN Conf on Manf Eng; CaxiasdoSul-RS- Brazil, 11-15 April.
 Zhang, K., Liu, W. (2009). Microstructure evolution of stainless steel during laser metal deposition shaping.In: Proceedings of the 2009 IEEE Int Conf on Measuring Techn and Mechatronics Auto, Zhangjiajie, Hunan, 11-12 April, 2, 93-96.
 Kloosterman, A., Wentzel, C., Carton, E. (2006). SLAM, A fast high volume additive manufacturing concept by impact welding; application to Ti6Al4V alloy. SAE International, Aerospace Man. And Auto. Fast. Conf. & Exhibition; Toulouse, France, 12-14 September.
 Taminger, K. M., & Hafley, R. A. (2003, September). Electron beam freeform fabrication: a rapid metal deposition process. In Proceedings of the 3rd annual automotive composites conference (pp. 9-10).
 Taminger, K.M., Hafley, R.A. (2006). Electron beam freeform fabrication for cost-effective near-net-shape manufacturing. In NATO/RTOAVT-139 specialists' meeting on cost-effective manufacture via net shape processing 2006, NATO: Amsterdam (The Netherlands).
 Ding, D., Pan, Z., Cuiuri, D., & Li, H. (2015). A practical path planning methodology for wire and arc additive manufacturing of thin-walled structures. Robotics and Computer-Integrated Manufacturing, 34, 8-19.
 Wang F et al (2013) Microstructure and mechanical properties of wire and arc additive manufactured Ti-6Al-4V. Metall Mater Trans A 44:968–977
 Xiong, J., Zhang, G., Hu, J., & Wu, L. (2014). Bead geometry prediction for robotic GMAW-based rapid manufacturing through a neural network and a second-order regression analysis. Journal of Intelligent Manufacturing, 25 (1), 157-163.
 Yilmaz, Oguzhan, and Adnan A. Ugla. "Shaped metal deposition technique in additive manufacturing: A review." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 230.10 (2016): 1781-1798.
 Brandl, E., Baufeld, B., Leyens, C., & Gault, R. (2010). Additive manufactured Ti-6Al-4V using welding wire: comparison of laser and arc beam deposition and evaluation with respect to aerospace material specifications. Phys. Procedia, 5(Pt 2), 595-606.
 Spencer, J. D., Dickens, P. M., & Wykes, C. M. (1998). Rapid prototyping of metal parts by three-dimensional welding. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 212(3), 175-182.
 Mughal, M.P., Fawad, H., Mufti, R.A., 2006. Three-dimensional finite-element modeling of deformation in weld-based rapid prototyping. Proc. Inst. Mech. Eng. Part C-J. Eng. Mech. Eng. Sci. 220, 875–885.
 Mughal M et al (2005) Deformation modeling in the layered manufacturing of metallic parts using gas metal arc welding: effect of process parameters. Model Simul Mater Sci Eng 13:1187
 Zhang, Y.M., Li, P.J., Chen, Y.W., Male, A.T., 2002. Automated system for welding-based rapid prototyping. Mechatronics 12, 27–53.
 Zhang et al. (2003), in which guidelines, including droplet transfer, heat input, and forming appearance control were also presented for GMAW-based additive manufacturing.
 Xiong, J., Lei, Y., Chen, H., & Zhang, G. (2017). Fabrication of inclined thin-walled parts in multi-layer single-pass GMAW-based additive manufacturing with flat position deposition. Journal of Materials Processing Technology, 240, 397-403.
 Syed, W.U.H., Pinkerton, A.J., Li, L. (2006). Combining wire and coaxial powder feeding in a laser direct metal deposition for rapid prototyping, J. Applied Surface Science, 252, 4803-4808.
 Syed, W.U.H., Pinkerton, A.J., Li, L. (2006). Simulation wire- and powder-feed direct metal deposition: An investigation of the process characteristics and comparison with single-feed methods, J. Laser Applications, 18 (1), 65-72
 Brandl, E., Layens, C., Palm, F. (2011). Mechanical properties of additive manufactured Ti6Al4V using wire and powder-based processes, IOP Conf. Series:
 Karunakaran, K.P., Suryakumar, S., Pushpa, V., & Akula, S. (2010). Low cost integration of additive and subtractive processes for hybrid layered manufacturing. Robotics and Computer-Integrated Manufacturing, 26, 490–499.
 Jamieson R, Holmer B, Ashby A. How rapid prototyping can assist in the development of new orthopedic products: a case study. Rapid Prototype J. 1995;1:3841.
 Hieu LC, Zlatov N, VanderSloten J, et al. Medical rapid prototyping applications and methods. Assembly Automation. 2005;25:284–292.
 Liu Q, Leu MC, Schmitt SM. Rapid prototyping in dentistry: technology and application. Int J Adv Manuf Technol. 2006;293:317–335.
 RAPOLAC Project home page.
[Online]. Available: http:// www. RAPOLAC.eu.
 Escobar-Palafox, G., Gault, R., & Ridgway, K. (2011). Robotic manufacturing by shaped metal deposition: state of the art. Industrial Robot: An International Journal, 38(6), 622-628.
 Escobar-Palafox, G., Gault, R., & Ridgway, K. (2011). Robotic manufacturing by shaped metal deposition: state of the art. Industrial Robot: An International Journal, 38(6), 622-628.
 Bonaccorso, F., Bruno, C., Cantelli, L. (2009). Control of a shaped metal deposition process. In: Physcon 2009; Catania, Ital y, 1-4 September
 Clark, D., Bache, M. R., & Whittaker, M. T. (2008). Shaped metal deposition of a nickel alloy for aero engine applications. Journal of Materials Processing Technology, 203 (1-3), 439-448.
 Baufeld, B., Van der Biest, O. (2009). Mechanical properties of Ti-6Al-4V specimens produced by shaped metal deposition. Sci-Tech Adv Mater, 10(1), 10.
 Baufeld, B., Van der Biest, O., Gault, R., Ridgway, K. (2011). Manufacturing Ti6Al4V components by shaped metal deposition: microstructure and mechanical properties. IOP Conf. Series: Mat. Sci. and Eng, 26(1).
 Bonaccorso, F., Cantelli, L., Muscato, G. (2011). An arc welding robot control for a shaped metal deposition plant: modular software interface and sensors. IEEE Transactions on Industrial Electronics, 58(8): 3126-3132.
 Muscato, G., Spampinato, G., Cantelli, L. (2008). A closed loop welding controller for a rapid manufacturing process.In: Proc.13th IEEE Conf; EFTA, Hamburg, Germany, 15-18 September2008; 1080-1083.
 Merz, R., Prnnz, F.B., Ramaswami, K., Terk, M., Weiss, L.E. (1994). Shape deposition manufacturing. In: Proceedings of the Solid Freeform Fabrication Symposium, Texas University in Austin, 8-10 August.
 Skiba, T., Baufeld, B., Vander-Biest, O. (2009). Microstructure and mechanical properties of stainless steel component manufactured by shaped metal deposition, ISIJ Int, 49(10), 1588-1591
 Hensinger, D. M., Ames, A. L., & Kuhlmann, J. L. (2000). Motion planning for a direct metal deposition rapid prototyping system. In Robotics and Automation, 2000. Proceedings. ICRA'00. IEEE International Conference on (Vol. 4, pp. 3095-3100). IEEE.
 Zhang, Y., Chen, Y., Li, P., & Male, A. T. (2003). Weld deposition-based rapid prototyping: a preliminary study. Journal of Materials Processing Technology, 135 (2), 347-357.
 Sequeira-Almeida, P.M. (2012). Process control, and development in wire and arc additive manufacturing. School of Applied Sciences, Cranfield University, Ph.D. thesis.
 Brandl, E., Baufeld, B., Leyens, C., Gault, R. (2010). Additive manufacturing Ti6Al4V using welding wire: comparison of laser and arc beam deposition and evaluation with respect to aerospace material specifications. J Physical Procedia 2010; 5: 595-606.
 Terrazas, C.A., Gaytan, S.M., Rodriguez, E., Espalin, D., Murr, L.E., Medina, F., et al. (2014). Multi-material metallic structure fabrication using electron beam melting. Int J Adv Manuf Technol, 71,33-45.
 Gong, X., Anderson, T., Chou, K. (2014). Review on powder-based electron beam additive manufacturing technology. Manufacturing Rev., available online at http://mfr.edp-open.org
 Wanjara, P., Brochu, M., Jahazi, M., 2007. Electron beam free forming of stainless steel using solid wire feed. Mater. Des. 28, 2278–2286
 Ding, J. (2012). Thermo-mechanical analysis of wire and arc additive manufacturing process. School of Applied Science, Cranfield University, Ph.D. thesis.
 Shames, H. (2010). Development of a selection program for additive manufacturing system. Stellenbosch University, Master thesis.
 Frazier, W. E. (2014). Metal additive manufacturing: a review. Journal of Materials Engineering and Performance, 23(6), 1917-1928.
[online]. Available: http://.www.nasa.gov 2009.
 Taminger KMB et al (2003) Electron beam freeform fabrication: a rapid metal deposition process. In: Proceedings of third annual automotive composites conference, Society of Plastic Engineers, Troy, MI; 9–10
 Zalameda JN, et al. (2013) Thermal imaging for assessment of electron beam freeform fabrication (EBF3) additive manufacturing deposits. SPIE Defense, Security, and Sensing, International Society for Optics and Photonics
 Rännar LE et al (2007) Efficient cooling with tool inserts manufactured by electron beam melting. Rapid Prototyp J 13: 128–135.
 Medina, J. A. I. (2012). Development and application of CFD model of laser metal deposition. Ph.D. thesis, University of Manchester.
 Yilmaz, O., & Ugla, A. A. (2017). Microstructure characterization of SS308LSi components manufactured by GTAW-based additive manufacturing: shaped metal deposition using pulsed current arc. The International Journal of Advanced Manufacturing Technology, 89(1-4), 13-25.
 Yilmaz, O., Almosawi, A. R. J., & Ugla, A. A. (2015). Design, Construction, and Controlling of A Shaped Metal Deposition Machine Using Arc Metal-Wire System. Pulse, 1, T1G.
 Ugla, A. A., Yilmaz, O., & Almusawi, A. R. (2016). Development and control of shaped metal deposition process using tungsten inert gas arc heat source in additive layered manufacturing. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 0954405416673112.
 Bai, X. W., Zhang, H. O., & Wang, G. L. (2013). Electromagnetically confined weld-based additive manufacturing. Procedia CIRP, 6, 515-520.
 Dos Santos, E. B., Pistor, R., & Gerlich, A. P. (2017). High-frequency pulsed gas metal arc welding (GMAW-P): the metal beam process. Manufacturing letters, 11, 1-4.
 Knezović, N., & Topić, A. (2018, June). Wire and Arc Additive Manufacturing (WAAM)–A New Advance in Manufacturing. In International Conference “New Technologies, Development and Applications” (pp. 65-71). Springer, Cham.
 Zhang, Z., Sun, C., Xu, X., & Liu, L. (2018). Surface quality and forming characteristics of thin-wall aluminum alloy parts manufactured by laser-assisted MIG arc additive manufacturing. International Journal of Lightweight Materials and Manufacture
 Martina, F., Mehnen, J., Williams, S. W., Colegrove, P., & Wang, F. (2012). Investigation of the benefits of plasma deposition for the additive layer manufacture of Ti–6Al–4V. Journal of Materials Processing Technology, 212(6), 1377-1386.
 Sawant, M. S., & Jain, N. K. (2018). Investigations on Additive Manufacturing of Ti-6Al-4V by µ-Plasma Transferred Arc Powder Deposition Process.
 Almeida, P. S., & Williams, S. (2010, August). Innovative process model of Ti–6Al–4V additive layer manufacturing using cold metal transfer (CMT). In Proceedings of the twenty-first annual international solid freeform fabrication symposium, the University of Texas at Austin, Austin, TX, USA.
 Ding, J., Colegrove, P., Mehnen, J., Ganguly, S., Almeida, P. S., Wang, F., & Williams, S. (2011). Thermo-mechanical analysis of wire and arc additive layer manufacturing process on large multi-layer parts. Computational Materials Science, 50 (12), 3315-3322.
 Mehnen, J., Ding, J., Lockett, H., & Kazanas, P. (2014). Design study for wire and arc additive manufacture. International Journal of Product Development 20, 19(1-3), 2-20.
 Ribeiro, A.F., Norrish, J., McMaster, R.S. (1994). A practical case of rapid prototyping using gas metal arc welding. In: Fifth International Conference on "Computer Technology in Welding", The Welding Institute, printed by Crampton's Printers, 15-16th June, Paris, France, 55, 1-6.
 Ribeiro, A.F., Norrish, J. (1996). Rapid prototyping process using metal directly. In: Proceedings of the 7th Annual Int Solid Freeform Fab Symposium, 12-14 August, The University of Texas at Austin, Austin, Texas, USA, 249-256.
 Larry, J. (1999). Welding: Principles and Applications. Albany: Thomson Delmar, 904.
 Xiong, J., Zhang, G., Qiu, Z., & Li, Y. (2013). Vision-sensing and bead width control of a single-bead multi-layer part: material and energy savings in GMAW-based rapid manufacturing. Journal of cleaner production, 41, 82-88.
 Doumanidis, C., & Kwak, Y. M. (2002). Multivariable adaptive control of the bead profile geometry in gas metal arc welding with thermal scanning. International Journal of Pressure Vessels and Piping, 79(4), 251-262.
 Dong, B. (2017). Fabricating copper-rich Cu-Al binary alloy by wire-arc additive manufacturing.
 Vilarinho, L. O., Nascimento, A. S., Fernandes, D. B., & Mota, C. A. M. (2009). Methodology for parameter calculation of VP-GMAW. Welding Journal, 88(4), 92S-98S.
 Harada, S., Ueyama, T., Mita, T., Innami, T., & Ushio, M. (1999). The state-of-the-art AC-GMAW process in Japan. IIW Doc. XIII-1589, 99, 1-10.
 Meco, S., Pardal, G., Eder, A., & Quintino, L. (2013). Software development for prediction of the weld bead in CMT and pulsed-MAG processes. The International Journal of Advanced Manufacturing Technology, 1-8.
 Pal S, Samantaray A (2008) Artificial neural network modeling of weld joint strength prediction of a pulsed metal inert gas welding process using arc signals. J Mater Process Technol 202:464–474.
 Bai, X., Zhang, H., & Wang, G. (2013). Improving prediction accuracy of thermal analysis for weld-based additive manufacturing by calibrating input parameters using IR imaging. The International Journal of Advanced Manufacturing Technology, 69(5-8), 1087-1095.
 Schwerdtfeger, J., Singer, R. F., & Körner, C. (2012). In situ flaw detection by IR-imaging during electron beam melting. Rapid Prototyping Journal, 18(4), 259-263.
 Yang, D., Wang, G., & Zhang, G. (2017). Thermal analysis for single-pass multi-layer GMAW based additive manufacturing using infrared thermography. Journal of Materials Processing Technology, 244, 215-224.
 Seppala, J. E., & Migler, K. D. (2016). Infrared thermography of welding zones produced by polymer extrusion additive manufacturing. Additive Manufacturing, 12, 71-76.
 Ueyama, T., Ohnawa, T., Tanaka, M., & Nakata, K. (2005). Effects of torch configuration and welding current on weld bead formation in high-speed tandem pulsed gas metal arc welding of steel sheets. Science and Technology of Welding and Joining, 10(6), 750-759.
 Tsushima, S., & Kitamura, M. (1994). Tandem electrode AC‐MIG welding‐Development of AC‐MIG welding process (Report 4).
 Harwig, D. D., Dierksheide, J. E., Yapp, D., & Blackman, S. (2006). Arc behavior and melting rate in the VP-GMAW process. Welding Journal, 85 (3), 52-62.
 Reis, R. P., Souza, D., & Ferreira Filho, D. (2015). Arc interruptions in Tandem pulsed gas metal arc welding. Journal of Manufacturing Science and Engineering, 137 (1), 011004.
 Pires, I., Quintino, L., & Miranda, R. M. (2007). Analysis of the influence of shielding gas mixtures on the gas metal arc welding metal transfer modes and fume formation rate. Materials & design, 28 (5), 1623-1631.
 Li, K. H., Chen, J. S., & Zhang, Y. (2007). Double-electrode GMAW process and control. Welding Journal-New York-, 86 (8), 231.
 Yang, D., He, C., & Zhang, G. (2016). Forming characteristics of thin-wall steel parts by double electrode GMAW based additive manufacturing. Journal of Materials Processing Technology, 227, 153-160.
 Wu, C. S., Hu, Z. H., & Zhong, L. M. (2012). Prevention of humping bead associated with high welding speed by double-electrode gas metal arc welding. The International Journal of Advanced Manufacturing Technology, 63 (5), 573-581.
 Wu, C. S., Zhang, M. X., Li, K. H., & Zhang, Y. M. (2007). Numerical analysis of double-electrode gas metal arc welding process. Computational Materials Science, 39 (2), 416-423.
 Song, R. B., Xiang, J. Y., & Hou, D. P. (2011). Characteristics of mechanical properties and microstructure for 316L austenitic stainless steel. Journal Of Iron And Steel Research, International, 18(11), 53-59.
 Ma, M., Wang, Z., Wang, D., & Zeng, X. (2013). Control of shape and performance for direct laser fabrication of precision large-scale metal parts with 316L Stainless Steel. Optics & Laser Technology, 45, 209-216.
 Xie, F., He, X., Cao, S., & Qu, X. (2013). Structural and mechanical characteristics of porous 316L stainless steel fabricated by indirect selective laser sintering. Journal of Materials Processing Technology, 213(6), 838-843.
 Mok, S. H., Bi, G., Folkes, J., Pashby, I., & Segal, J. (2008). Deposition of Ti–6Al–4V using a high power diode laser and wire, Part II: Investigation of the mechanical properties. Surface and Coatings Technology, 202(19), 4613-4619.
 Baufeld, B., Brandl, E., & Van der Biest, O. (2011). Wire-based additive layer manufacturing: Comparison of microstructure and mechanical properties of Ti–6Al–4V components fabricated by laser-beam deposition and shaped metal deposition. Journal of Materials Processing Technology, 211(6), 1146-1158.
 Xiao, R., Chen, K., Zuo, T., Ambrosy, G., & Huegel, H. (2002, September). Influence of wire addition direction in C02 laser welding of aluminum. In Lasers in Material Processing and Manufacturing (Vol. 4915, pp. 128-138). International Society for Optics and Photonics.
 Leyens, C., & Peters, M. (Eds.). (2003). Titanium and titanium alloys: fundamentals and applications. John Wiley & Sons.
 Skiba, T., Baufeld, B., & Van der Biest, O. (2011). Shaped metal deposition of 300M steel. Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 225(6), 831-839.
 Wang, H., Jiang, W., Ouyang, J., & Kovacevic, R. (2004). Rapid prototyping of 4043 Al-alloy parts by VP-GTAW. Journal of Materials Processing Technology, 148(1), 93-102.
 Amine, T., Newkirk, J. W., & Liou, F. (2014). An investigation of the effect of direct metal deposition parameters on the characteristics of the deposited layers. Case Studies in Thermal Engineering, 3, 21-34.
 Sudhakaran, R., Sivasakthivel, P. S., Nagaraja, S., & Eazhil, K. M. (2014). The effect of welding process parameters on pitting corrosion and microstructure of chromium-manganese stainless steel gas tungsten arc welded plates. Procedia Engineering, 97, 790-799.
 Sudhakaran, R., Vel-Muruganb, V., & Sivasakthivelc, P. S. (2012). Effect of Process Parameters on Depth of Penetration in Gas Tungsten Arc Welded (GTAW) 202 Grade Stainless Steel Plates Using Response Surface Methodology. TJER 2012, 9(1), 64-79.
 FAQ: What is the difference between heat input and arc energy? 13/11/2017
 Weman, K. (2011). Welding processes handbook. Elsevier.
 Stenbacka, N., Choquet, I., & Hurtig, K. (2012). Review of arc efficiency values for gas tungsten arc welding. In IIW Commission IV-XII-SG212, Intermediate Meeting, BAM, Berlin, Germany, 18-20 April 2012 (pp. 1-21).
 Bosworth, M. R. (1990). Effective heat input in pulsed current gas metal arc welding-solid wire electrodes
 Quintino, L., Liskevich, O., Vilarinho, L., & Scotti, A. (2013). Heat input in full penetration welds in gas metal arc welding (GMAW). The International Journal of Advanced Manufacturing Technology, 68(9-12), 2833-2840.
 Kumar, A., Gautam, S. S., & Kumar, A. (2014). Heat Input & Joint Efficiency of Three Welding Processes TIG, MIG, and FSW Using AA6061. International Journal of Mechanical Engineering and Robotics Research, 1, 89-94.
 Choi, S. G., Kim, J. J., Ryu, S. H., & Kwon, B. J. (2009, August). Development of tandem MIG welding control system. In ICCAS-SICE, 2009 (pp. 820-823). IEEE.
 Ueyama, T., Ohnawa, T., Tanaka, M., & Nakata, K. (2007). The occurrence of arc interaction in tandem pulsed gas metal arc welding. Science and Technology of Welding and Joining, 12(6), 523-529.
 Sproesser, G., Pittner, A., & Rethmeier, M. (2016). Increasing performance and energy efficiency of gas metal arc welding by a high power tandem process. Procedia CIRP, 40, 642-647.