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Globula and Spray Transfer in Mig Welding

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Abstract

“Globular” and “spray” are classified by IIW as two distinct modes of metal transfer in “Metal Inert Gas” (MIG) welding. In argon there is a fairly sudden transition current above which the diameter of the molten droplets from the welding wire changes from having a diameter larger than the welding wire in the “globular” mode to being smaller than the welding wire in the “spray” mode. An approximate physical model is considered where, for currents much below the transition current, the forces on the molten drop attached to the welding wire are dominated by surface tension, tending to hold the drop to the wire, and gravity, tending to pull the drop from the wire. Above the transition current, however, the magnetic pinch pressure from the self-magnetic field of the current becomes greater than the increase in pressure inside the drop produced by surface tension so there is then spray transfer. Equating these pressures, a formula for the transition current I, is I = 2π(γD/μ 0)1/2 where D is the diameter of the wire, γ is the surface tension coefficient of the molten metal and μ0 is the permeability of free space. Predicted transition currents are in fair agreement with experimental results for both steel and aluminium, for wire diameters varying from 0.4 to 3.0 mm.

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References

  1. Van Adrichem T.J.: Metal transfer in submerged arc welding, IIW Doc. SG-212-78-66,1966, also Classification of Metal Transfer, IIW Doc. XII-636-76/SG-212-362-76, 1976.

  2. Lancaster J.F.: The Physics of Welding, 2nd Edition, Pergamon Press, Oxford, 1986, p. 234.

    Google Scholar 

  3. Greene W.J.: An analysis of transfer in gas-shielded welding arcs, Transactions of the American Institute of Electrical Engineers, Part 2: Applications and Industry, 1960, vol. 79, no. 7, pp. 194–203.

    Google Scholar 

  4. Amson J.C.: Lorentz force in the molten tip of an arc electrode, British Journal of Applied Physics, 1965, vol. 16, no. 8. p. 1169.

    Article  Google Scholar 

  5. Jones L.A., Eagar T.W. and Lang J.H.: Magnetic forces acting on molten drops in gas metal arc welding, Journal of Physics D: Applied Physics, 1998, vol. 31, no. 1, pp. 93–106.

    Article  CAS  Google Scholar 

  6. Jones L.A., Eagar T.W. and Lang J. H.: A dynamic model of drops detaching from a gas metal arc welding electrode, Journal of Physics D: Applied Physics, 1998, vol. 31, no. 1, pp. 107–123.

    Article  CAS  Google Scholar 

  7. Kim Y.S. and Eagar T.W.: Analysis of metal transfer in Gas Metal Arc Welding, Welding Journal, 1993, vol. 72, no. 6, pp. 269s–278s.

    Google Scholar 

  8. Rhee S. and Kannatey-Asibu E.: Observations of metal transfer during Gas Metal Arc Welding, Welding Journal, 1992, vol. 71, no. 10, pp. 381 s–386s.

    Google Scholar 

  9. Arif N., Lee J.H. and Yoo C.D.: Modelling of globular transfer considering momentum flux in GMAW, Journal of Physics D: Applied Physics, 2008, vol. 41, no. 19, paper 195503.

  10. Lancaster J.F.: The Physics of Welding, 1st Edition, Pergamon Press, Oxford, 1984, pp. 52–66.

    Google Scholar 

  11. Allum C.J.: Metal transfer in arc welding as a varicose instability: part 1, Journal of Physics D: Applied Physics, 1985, vol. 18, no. 7, pp. 1431–1446.

    Article  CAS  Google Scholar 

  12. Allum C.J.: Metal transfer in arc welding as a varicose instability: part 2, Journal of Physics D: Applied Physics, 1985, vol. 18, no. 7, pp. 1447–1468.

    Article  CAS  Google Scholar 

  13. Lowke J.J.: Physical basis for the transition from globular to spray modes in Gas Metal Arc Welding, Journal of Physics D: Applied Physics, 2009, vol. 42, no. 13, paper 135204.

  14. Haidar J. and Lowke J.J.: Predictions of metal droplet formation in arc welding, Journal of Physics D: Applied Physics, 1996, vol. 29, no. 12, pp. 2951–2960.

    Article  CAS  Google Scholar 

  15. Hu J. and Tsai H.L.: Effects of current on droplet generation and arc plasma in gas metal arc welding, Journal of Applied Physics, 2006, vol. 100, no. 5, paper 053304.

  16. Tanaka M. and Lowke J.J.: Predictions of weld pool profiles using plasma physics, Journal of Physics D: Applied Physics, 2007, vol. 40, no. 1, pp. R1–R23.

    Article  CAS  Google Scholar 

  17. Maecker H.: Plasma flow in arcs from self magnetic compression, Z. Physik, 1955, vol. 141, no. 2, pp. 198–216.

    Article  Google Scholar 

  18. Starling S.G. and Woodall A.J.: Physics, London, Longmans, 1958, p. 104.

    Google Scholar 

  19. Lesnewich A.: Control of melting rate and metal transfer in gas shielded metal arc welding, Welding Journal, 1958, vol. 37, no. 9, pp. 418s–425s.

    Google Scholar 

  20. Soderstrom E.J. and Mendez P.F.: Metal Transfer during GMAW with thin electrodes, Welding Journal, 2008, vol. 87, no. 5, pp. 124s–133s.

    Google Scholar 

  21. Smith A.A. and Poley J.G.: Effect of wire diameter on metal transfer in the aluminium self adjusting arc, British Welding Journal, 1959, vol. 6, no. 12, pp. 565–568.

    Google Scholar 

  22. Keene B.J.: Review of data for the surface tension of iron and its binary alloys, International Materials Reviews, 1988, vol. 33, no. 1, pp. 1–37.

    Article  CAS  Google Scholar 

  23. Brandes E.A.: Ed. Smithell’s Metals Reference Book, 6th Ed. London, Butterworths, 1983.

    Google Scholar 

  24. Haidar J.: An analysis of the formation of metal droplets in arc welding, Journal of Physics D: Applied Physics, 1998, vol. 31, no. 10, pp. 1233–1244.

    Article  CAS  Google Scholar 

  25. Zielinska S., Pellerin S., Valenski F., Dzierzega K., Musio K., de Izarra C. and Briand F.: Gas influence on the arc shape in MIG-MAG welding, European Physical Journal Applied Physics, 2008, vol. 43, no. 1, pp. 111–122.

    Article  CAS  Google Scholar 

  26. Haidar J. and Lowke J.J.: Effect of CO2 shielding gas on metal droplet formation in arc welding, IEEE Transactions on Plasma Science, 1997, vol. 25, no. 5, pp. 931–936.

    Article  CAS  Google Scholar 

  27. Wang F., Hou W.K., Hu S.T., Kannatey-Asibu F., Schultz W.W. and Wang P.C.: Modelling and analysis of metal transfer in gas metal arc welding, Journal of Physics D: Applied Physics, 2003, vol. 36, no. 9, pp. 1143–1152.

    Article  CAS  Google Scholar 

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  1. CSRIO Materials Science and Engineering, Sydney, Australia

    John J. Lowke

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Lowke, J.J. Globula and Spray Transfer in Mig Welding. Weld World 55, 19–23 (2011). https://doi.org/10.1007/BF03321282

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