Influence of Shielding Gas Composition on the Properties of Flux-Cored Arc Welds of Plain Carbon Steel

Authors

  • Ramy Gadallah
  • Raouf Fahmy
  • Tarek Khalifa
  • Alber Sadek

Keywords:

flux cored arc welding, shielding gas compositions, bead on plate, arc stability & efficiency, deposition rate

Abstract

In this study, the influence of variation in the shielding gas composition on the weld properties of steel ST 37-3 was investigated. Six different shielding gas compositions in addition to pure argon (Ar) and pure CO2 were studied in this work using flux cored arc welding (FCAW) process. For bead-on-plate (B.O.P) specimens pure Ar shielding gas has excellent arc stability; however, with increase of the CO2 percent in the shielding gas compositions, the arc stability becomes noisy (unstable arc) especially for pure CO2. 75% Ar – 25% CO2 shielding gas composition has the optimum deposition rate among other shielding gases for B.O.P. Furthermore, for complete real welded joints, the absorbed energy in the Charpy impact toughness test of weld metal (W.M) decreases with increase of the CO2 percent in the shielding gas composition. Additionally, the hardness of W.M decreases with the increase of the CO2 percent in the shielding gas composition.

References

E. Karadeniz, U. Ozsarac, and C. Yildiz, “The effect of process parameters in gas metal arc welding process,” Materials and Design, vol. 28, pp. 649–656, Sep. 2005.

M. Ebrahimnia, M. Goodarzi, M. Nouri, and M. Sheikhi, “Study of the effect of shielding gas composition on the mechanical weld properties of steel St. 37-2 in gas metal arc welding,” Materials and Design, vol. 30, pp. 3891–3895, Mar. 2009.

Gertsovich and N. Svanberg, “Analysis of MIG welding with aim on quality,” M.Sc. Thesis, Dept. Signal Processing,

Blekinge Institute, Sweden, Jul. 2008.

J. Lancaster, Handbook of Structural Welding, 1st ed. Cambridge, England: Abington, 1992.

U. Mohamed, “Effect of welding parameters on the properties of austenitic stainless steel weldments,” M.Sc. Thesis, Dept. Mechanical Eng., Zagazig Univ., Zagazig, Egypt, 2009.

"Specification for carbon steel electrodes for flux cored arc welding,” American Society for Mechanical Engineers

(ASME), 1998.

“Specification for welding shielding gases,” American Society for Mechanical Engineers (ASME) 2007.

“Boiler and pressure vessel code - qualification standard of welding and brazing procedures, welders, brazers, and welding and brazing operators,” American Society for Mechanical Engineers (ASME), 2007.

“Requirements for impact testing,” American Welding Society (AWS), 2004.

“Standard test methods and definitions for mechanical testing of steel products,” American Society for Testing and

Materials (ASTM), 2007.

S. Kou, Welding Metallurgy Handbook, 2nd ed. New York, USA: John Wiley and Sons, 2002.

S. Mukhopadhyay and T.K. Pal, “Effect of shielding gas mixture on gas metal arc welding of HSLA steel using solid and flux-cored wires,” International Journal of Advanced Manufacturing Technology, vol. 29, pp. 262–268, Dec. 2005.

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Published

2012-01-01

How to Cite

[1]
R. Gadallah, R. Fahmy, T. Khalifa, and A. Sadek, “Influence of Shielding Gas Composition on the Properties of Flux-Cored Arc Welds of Plain Carbon Steel”, Int. j. eng. technol. innov., vol. 2, no. 1, pp. 1–12, Jan. 2012.

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