Abstract: Taking high frequency welded aluminum alloy tube for radiator with thickness of 0.26 mm as the object, the heating process of the welded pipe under different parameters was simulated by using COMSOL Multiphysics software.The influence of different welding parameters and the concentricity between coil and welded tube on the welding quality was analyzed.The results show that when the welding frequency is 365 kHz and the V-shaped angle is 6°, the aluminum alloy thin-walled tube is heated in full wall thickness, which leads to better welding quality.The heating efficiency can be improved by higher frequency and smaller V-shaped angle.But higher frequency will cause lack of weld in welded pipes, and smaller V-shaped angle will cause welding defects such as"sand hole" in welded pipe.When other welding conditions are fixed, the lateral deviation between the coil and the pipe will change the heating efficiency, and the longitudinal deviation has no obvious influence on the heating.