The microstructure and properties of TIG repairing welding joints of 2219 alloy with different bevel angle were studied against the bright line image in the X-ray film.After X-ray detection,SEM observation,energy spectrum analysis,and tensile test,it was found that,the blackness of bright line image in the X-ray film decreased gradually,with the increase of the α bevel angle at the range of 0° to 20°.In addition,the α(Al)+θ non-equilibrium eutectic structure with high copper content,had a stronger effect on X-ray scattering and absorption,which was the cause of bright line image in the X-ray film.Meanwhile,the electromagnetic stirring nearby the α bevel angle was weaker,and the boundary layer width in front of the solid-liquid interface was wider,than that of beside the β bevel angle.Also the temperature gradient and the degree of constitutional supercooling in the boundary layer was larger than that of alongside the β bevel angle,both of which promoted the growth of the dendrites beside the α bevel angle.When the β bevel angle was for 20°,the tensile strength and elongation of the joint gradually increased with the increase of α bevel angle,in the range of 0° to 20°,and the excellent room temperature mechanical property was obtained at 20°.The bright line image in the X-ray film of the repair welding joint could not be treated as the welding defect.