In order to reduce the deformation caused by welding stress,ZCuZn25Al6Fe3Mn3 casting brass base is used as the thermal conductivity of the main heat dissipation equipment under the premise of ensuring the tensile strength of welding seam in the automatic welding process of support bracket. Through experimental study,the required welding specifications for welded joints with stable mechanical properties and the relationship between heat input and thermal conductivity of the base under these specifications are obtained,which can provide a reference for the welding process to minimize the welding deformation of the support bracket and make the weld meet the requirements of service performance.