Ah-Young Park et al 2009 J. Phys. D: Appl. Phys. 42 225503 doi:10.1088/0022-3727/42/22/225503
Ah-Young Park1, Sun-Rak Kim, Muhammad A Hammad and Choong D Yoo
Show affiliationsWhile the pinch instability theory (PIT) has been widely used to analyse the spray mode in gas metal arc welding (GMAW), it assumes an infinite cylinder and no current leakage on the cylinder surface. The PIT is modified in this work to predict the spray mode more accurately by considering reduction of the molten tip radius, the finite cylinder geometry and current leakage. The effective cylinder radius is formulated as a function of current to consider the tapered cone shape of the molten tip, and the critical wavelength of the modified PIT is derived considering a finite cylinder with a hemispherical end and current leakage. The effective radius is found to have most significant effects on drop transfer followed by the finite cylinder geometry and current leakage, and the predicted results of the modified PIT are in reasonable agreement with the experimental data of the spray mode.
Issue 22 (21 November 2009)
Received 24 August 2009, in final form 25 September 2009
Published 27 October 2009
Ah-Young Park et al 2009 J. Phys. D: Appl. Phys. 42 225503
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