The static force balance model (SFBM) has been used to analyze drop transfer in gas metal arc
welding. Although the SFBM is capable of predicting the detaching drop size in the globular mode with
reasonable accuracy, discrepancy between the calculated and experimental results increases with current. In
order to reduce discrepancy, the SFBM is modified by considering the momentum of the molten metal
flow, which is generated by the pinch pressure. The momentum increases with smaller drop size and
becomes compatible to the electromagnetic force. The modified force balance model (MFBM) predicts the
experimental results more accurately, and extends its application to the projected mode.