Abstract—The advance high-strength was widely used for steel construction. The box column production with multi-pass robotic gas metal arc welding (GMAW) for steel construction have been interested. However, the proper welding parameters for GMAW arm robot welding have to examine. This research was assembly the external diaphragm and box column with difference gap 3, 5 and 7 mm. The box column was made from advance high-strength plate thickness 12 and 16 mm for welding multi-pass 3 and 4 pass, respectively. The experiment results reveal that different heat input in range of 25.69 – 28.04 kJ/cm was not affecting to the strength of weld joint comparing with low heat input welding from welder. The elongation was a few decreasing with increasing of weld joint gap and skin plate thickness. The hardness level from GMAW arm robot welding on the weld joint was different based on skin plate thickness. The weld bead penetration of GMAW arm robot welding was lower than the welder welding. The gap size, heat input, number of pass and skin plate thickness were affecting to the yield strength, elongation and hardness of weld joint. However, these parameters were not affected to the tensile strength of weld joint. Therefore, the heat input value from this research can be used in the box column production line with GMAW arm robot welding.