Abstract
One function of shielding gases used in welding processes, such as hydrogen (H2), oxygen (O2), carbon dioxide (CO2), nitrogen (N2), helium (He), argon (Ar) and their mixtures, is protection of the weld pool against harmful contamination that could generate defects. In addition to this primary function, shielding gases significantly affect the shape of the weld, weld geometry, seam appearance, metallurgical and mechanical properties, welding speed, metal transfer, arc stability or beam and fume emissions. The shielding gas is thus a key factor in determining weld joint properties and welding process efficiency. As welding processes have become enhanced and welding research has advanced, different combinations of shielding gas mixtures have become available under a wide variety of trademarks, each claiming to offer the best efficiency. The shielding gas flow rate in GMAW welding is usually set according to empirical experiment. The flow generally remains unchanged throughout the entire welding process and is set at maximum values of the welding parameters so that there is sufficient gas cover. This setting means, however, that unnecessarily large quantities of shielding gas may be consumed in other phases of the welding process. In view of constantly increasing prices and shortfalls in helium supply, there is a need to optimize the use of shielding gas. Consequently, an ability to closely monitor the shielding gas blend and reduce waste can provide valuable cost savings. This paper examines the effects of shielding gas mixtures and their components, presents a cross-comparison of shielding effects in fusion welding and suggests guidelines for adaptive controllability of shielding gas in advanced adaptive fusion welding. The study reviews scientific case studies and experiments from the point of view of the effect of the shielding gas on the process efficiency and process outcome. The study considers shielding gases for welding of both ferrous metals (i.e. carbon steels, stainless steels, high-strength steels) and non-ferrous metals (i.e. aluminium and its alloys, nickel and its alloys and copper and its alloys). Appropriate choice of shielding gas and use of an optimum flow rate results in better quality in terms of increased productivity, reduced gas consumption and improved weld geometry properties, microstructure and mechanical properties. Although some blends can be used effectively in many different processes, other blends appear process-dependent; they produce far poorer results when utilized in non-appropriate processes. Particle image velocimetry (PIV) and Schlieren techniques can be used for visual sensing of gas flow during fusing welding. Moreover, an adaptive alternative gas supply can improve welding performance and weld quality and reduce harmful fume emission.
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References
Weber R (2003) How to save 20% on welding costs. Trailer Body Build 44(3):46–50
Filho DF, Reis RP, Ferraresi VA (2011) Evaluation of the shielding gas influence on the weldability of ferritic stainless steel. In: Arc Welding. Rijeka, In. Tech., pp 152–176
Kah P, Martikainen J (2013) Influence of shielding gases in the welding of metals. Int J Adv Manuf Technol 64(9):1411–1421
little K, Stapon G (2005) Simplifying shielding gas selectin, how different gases gas blends affect your welding application. J Pract Weld 9(1)
Kang B, Prasad YK, Kang MJ, Kim HJ, Kim IS (2009) Characteristics of alternate supply of shielding gases in aluminum GMA welding. J Mater Process Technol 209(10):4716–4721
Sierwert E, Wilhelm M, Hässler M, Schein J, Hanson T, Schnick M, Füssel U (2014) Visualization of gas flows in welding arcs by the Schlieren measuring technique. Weld J 1:1–5
Schnick M, Dreher M, Zschetzsche J, Füssel U, Spille-Kohoff A (2012) Visualization and optimization of shielding gas flows in arc welding. Weld World 56(1–2):54–61
American Welding Society (AWS) (2006) Best practices: gas tungsten arc welding. Weld J 80–82
Lyttle KA, Praxair I (1990) ASM handbook, vol.6. ASM international
Irvin B (1999) Shielding gases are the key to innovations in welding. Weld J 78(1):37–41
Lozano J, Moreda P, Llorente CL, Bilmes PD (2003) Fusion characteristics of austenitic stainless steel GMAW welds. Lat Am Res 33:27–31
EN ISO 14175 (2008) Welding consumable. Gases and gas mixtures for fusion welding and allied processes. EN ISO
A. CODE (2015) Qualification standard for welding, brazing and fusion procedures; welders; brazers; and welding, brazing and fusion operators. ASME
EN ISO 15614 (2004) Specification and qualification of welding procedures for metallic materials—Welding procedure test—Part 1: arc and gas welding of steels and arc welding of nickel and nickel alloys. EN ISO
German Welding Society DVS (2001) MIG/MAG welding: course book. Fronius Technology Centre, Düsseldorf
Uttrachi GD (2007) GMAW shielding gas flow control systems. Weld J 86(4):22–23
Kim LS, Son JS, Kim HJ, Chin BA (2006) A study on variations of shield gas in GTA welding using finite element. J Achiev Mater Manuf Eng 17(1–2):249–252
Nakhla H, Yao J, Bethea M (2012) Environmental impact of using welding gas. J Technol Manag Appl Eng 28(3):1–11
Campbell SW, Galloway AM, McPherson NA (2012) Techno-economic evaluation of reducing shielding gas consumption in GMAW whilst maintaining weld quality. Int J Adv Manuf Technol 63(9–12):975–985
Campbell SW, Galloway AM, McPherson NA, Gillies A (2012) Evaluation of gas metal arc welding with alternating shielding gases for use on AA6082T6. Proc Inst Mech Eng B J Eng Manuf 226(6):992–1000
Campbell V, Galloway A, Ramsey G, Mcpherson N (2012) A potential solution to GMAW gas flow optimisation. In: 9th international conference on trends in welding research. Chicago
Mvola B, Kah P, Martikainen J, Suoranta R (2015) State-of-the-art of advanced gas metal arc welding processes: dissimilar metal welding. Proc Inst Mech Eng B J Eng Manuf 229(10):1694–1710
Bell D (2011) Avoiding mix-ups with shielding gas mixes. [Online]. Available: http://www.thefabricator.com. Accessed 23 June 2015
Rhee S, Kannatey-Asibu JE (1992) Observation of metal transfer during gas metal arc welding. Weld J 71:381–386
Zielinska SEA (2008) Gas influence on the arc shape in MIG-MAG welding. Eur Phys J Appl Phys 43(1):111–122
Church JG, Imaizumi H (1990) Welding characteristics of new welding process, TIME process. IIW, Vols. Doc XII-1199-90
Suban M, Tusek J (2001) Dependence of melting rate in MIG/MAG welding on the type of shielding gas used. J Mater Process Technol 119:185–192
Han KH, Han JM, Lee MW, Lee EB, Han YS (1995) Effect of shielding gas on the weldability of high efficient GMAW process. J KWS 13(1):559–569
Gouda M, Takahashi M, Ikeuchi K (2005) Microstructures of gas metal arc weld metal of 950 MPa class steel. Sci Technol Weld Join 10(3):369–377
Menzel M (2003) The influence of individual components of an industrial gas mixture on the welding process and the properties of welded joints. Weld Int 17(4):262–264
Ebrahimnia M, Goodarzi M, Nouri M, Sheikhi M (2009) Study of the effect of shielding gas composition on the mechanical weld properties of steel ST 37–2 in gas metal arc welding. Mater Des 30(9):3891–3895
Zhernosekov AM, Sidorets VN, Shevchook SA (2014) Combined pulsed effect of shielding gases and welding current in consumable electrode welding. Weld Int 66(12):9–13
Gadallah R, Fahmy R, Khalifa T, Sadek A (2012) Influence of shielding gas composition on the properties of flux-cored arc welds of plain carbon steel. Int J Eng Technol Innov 2(1):01–12
Lathabai S, Stout RD (1985) Shielding gas and heat input effects on fluc cored weld metal properties. Weld J 303–313
Katherasan D, Sathiya P, Raja A (2013) Shielding gas effects on flux cored arc welding of AISI 316L (N) austenitic stainless steel joints. Mater Des 45:43–51
Mukhopadhyay S, Pal TK (2006) Effect of shielding gas mixture on gas metal arc welding of HSLA steel using solid and flux-cored wires. Int J Adv Manuf Technol 3–4(29):262–268
Liao MT, Chen WJ (1999) A comparison of gas metal arc welding with flux-cored wires and solid wires using shielding gas. Int J Adv Manuf Technol 15(1):49–53
Moravec J, Rohan P (2011) Influence of different gas shielded types on weld pool geometry for MIG welding method. In: 20th International conference on metallurgy and materials. Brno, Czech Republic
Lucas W (1992) Shielding gases for arc welding. Weld Met Fabr 60:218–225
Kim W-G, Um K-K, An Y-H, Lee C-S (2009) Mechanical properties of YS 460MPa TMCP steel plate for large container ships. In: Proceedings of the nineteenth (2009) international offshore and polar engineering conference. Osaka, Japan
Gyu B, Ryu KM, Sik PJ, Jeong BY, Kim TS, Lee JS (2010) Brittle crack arrestability of thick steel plates for shipbuilding. J KWJS 28(1):47–53
Kim HJ, Jang TW, Yoon DR (2008) Tandem electrogas welding of higher-strength hull structural steel. In: Proceedings of the eighteenth (2008) international offshore and polar engineering conference. Vancouver, BC, Canada
Sasaki K, Motomatsu R-I, Ohkita S, Suda K, Hashiba Y, Imai S (2004) Development of two-electrode electrogas arc welding process. Nippon Steel Technical Report No 90, Tokyo, Japan
Pires I, Rosado T, Costa A, Quintino L (2007) Influence of GMAW shielding gas in productivity and gaseous emissions. In: 10th international aachen wqelding conference. Aachen, Germany
Migatronic (2012) IGC-Intelligent gas control. Migatronic. [Online]. Available: http://www.migatronic.com. Accessed 9 May 2016
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Mvola, B., Kah, P. Effects of shielding gas control: welded joint properties in GMAW process optimization. Int J Adv Manuf Technol 88, 2369–2387 (2017). https://doi.org/10.1007/s00170-016-8936-2
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DOI: https://doi.org/10.1007/s00170-016-8936-2