Two Aviation Material After Welding Electron Beam Local Heat Treatment Of Stress Field Numerical Simulation,

Electron beam welding has significant keyhole effect, which results in the electronbeam welding different from the general melting welding, and also has important influenceon its welding stresses and distortion. Electron beam post-weld local heat treatment is anew kind of heat treatment method. So, it can uses finite element method to forecast theresidual stresses of electron beam welding and electron beam post-weld local heattreatment, and it has important theoretical value and realism meaning in completingtheoretical analysis on thermal process of electron processing technique and in guidingwelding parameter selecting. The influence of residual stresses in two kinds of aerialmaterial—TC4 titanium alloy and GH4133 high-temperature alloy joints of electron beampost-weld local heat treatment is discussed in this paper.Based on thermal elastic-plastic theory, and making use of ANSYS finite elementprocedure, a three-dimensional finite element model using mobile heat source oftemperature and stresses field of electron beam welding and electron beam post-weld localheat treatment in TC4 titanium alloy is established. The calculating results in the twoconditions of high voltage and medium voltage show that electron beam post-weld localheat treatment can decrease the residual stresses peak value of TC4 titanium alloy electronbeam welded joint to a certain extent, and can let the high stresses peak value expandtowards the base metal, at the same time, can let the high stresses zone distribute moregentle.Comparing the temperature field distribution of TC4 titanium alloy joints with twoacceleration voltage conditions of high voltage and medium voltage, the results show thatthe high voltage electron welding has higher temperature peak value, narrower weldedseam, and bigger depth-to-width ratio. However, the medium voltage welding has lowertemperature peak value, wider welded seam, and smaller depth-to-width ratio.Comparing the stresses field distribution of TC4 titanium alloy joints with twoacceleration voltage conditions of high voltage and medium voltage, the results show thatthe medium voltage welded and heat treatment joint has bigger residual stress peak valuein weld center than the corresponding peak value of the high voltage joint. A three-dimensional finite element model using mobile heat source of temperatureand stresses field of electron beam welding and electron beam post-weld local heattreatment in GH4133 high-temperature alloy is founded; the temperature field and theresidual field in high voltage condition is also calculated. The results show that electronbeam post-weld local heat treatment can decrease the residual stress peak value of GH4133high-temperature alloy electron beam welded joints to a certain extent, and can let the highstress peak value expand towards the base metal, at the same time, can let the high stresszone distribute more gentle.