Quality ensuring of welded joints of aircraft parts made by electron beam welding using of high-performance machining

Abstract

This paper presents an assessment of the possibility of creating permanent joints of titanium alloys VT20, OT4-1, performed by electron beam welding with a minimum level of defects due to the use of high-speed machining. The correlation of the defect level of welded joints made by electron beam welding was revealed, depending on the type of mechanical preparation of the joined edges for welding. It is established that the roughness parameter evaluating the surface quality of the joined edges for welding is not correct. A rational way to assess is the saturation of capillary-condensed moisture. It is established that mechanical processing using low spindle speeds and cutting speeds provides the lowest saturation index of capillary-condensed moisture due to thermal processes, which leads to the minimization of pore formation. The obtained research results were tested at PJSC "UAC", KnAAZ named after Yu.A. Gagarin and can be recommended in the technological process of production of titanium power elements of aircraft performed by electron beam welding.