The influence of the leading and trailing arc welding current on two-wire tandem submerged (SAW-T) arc weld quality was studied at a iso-heat input of 2.5 kJ/ mm. The weld quality includes weld bead dimensions, cooling time from 800 to 500°C in the weld pool, weld bead ferrite phase fraction, and micro-hardness. The cooling time was calculated from the temperature distribution predicted using the numerical model. For a constant heat input, the weld penetration significantly reduced with decreasing leading arc current at a low level of trailing arc current while the final weld penetration was less sensitive to the leading arc current at higher trailing arc current.