Abstract: To reveal the influence mechanism of crosswind conditions on arc and molten pool behavior during the gas metal arc welding（GMAW） process, a three-dimensional transient model of arc and molten pool coupling was established using the standard k-ε turbulence model. A comparative analysis was conducted on the effects of varying crosswind intensities perpendicular to the welding direction on arc morphology and molten pool morphology. The results show that under crosswind conditions, the arc plasma’s trajectory and velocity change. Stronger crosswinds weakens the protective efficiency of the shielding gas, leading to the formation of vortices in the welding area and increasing the risk of porosity defects. The increase of wind field strength increases the arc length and accelerates the heat dissipation rate, leading to the decrease of the heat input to the workpiece and the smaller shape and size of the molten pool. The reliability of the model is verified by comparing the simulation results and arc morphology and pool morphology captured by welding test.