Study of the Effect of Focusing and Oscillation of Electron Beam on the Structure and Properties of Welded Seams

摘要

This paper presents the results of a study of the effect of focusing and oscillation of the electron beam on the structure,and the properties of welds made of heat-resistant pearlitic steel.Electron-beam welding using a static beam does not provide a uniform weld structure.According to the results of microhardness measurement,the weld metal has a high hardness with values on average 500 HV.The reason for this may be insufficient intensity of the mixing processes and insufficient residence time of the weld pool in the molten state.The use of electron beam sweeps during welding leads to a decrease in the microhardness of the weld metal to values of 450 HV.Also,the application of electron beam sweeps improves the weld geometry-a smoother transition from the upper part of the weld to the middle,more rounded shape of the root of the weld.