Electron beam welding (EBW) is found to be the most suitable welding process for aerospace components due to high weld efficiency and clean welding process. In the present study, different heat treatment conditions like annealing, solution treatment (ST), solution treatment plus aging (STA) in different combinations of pre-/post-weld treatments are studied on Ti alloy Ti6Al4V. Its effects are analyzed through microstructure, microhardness, and tensile properties, across the fusion zone (FZ). Microstructure shows the presence of fine α/α′ particles and secondary α, which is responsible for improvement in weld properties. Microhardness across the weldment shows increase in hardness in the FZ in all the cases of pre- or post-weld heat treatment except ST + EBW + Age/STA + EBW treated sample. Increase in microhardness of all the FZ shows good response of weldment structure for heat treatment. In case of STA samples, reduction in microhardness of weldment is found. It is due to higher properties of STA parent metal as compared to as-welded structure. Optimum condition for the best combination of properties (strength and elongation) is found to be ST + EBW + STA and/or annealed + EBW + STA.

由于高焊接效率和清洁焊接工艺，电子束焊接（EBW）被认为是最适合航空航天部件的焊接工艺。在本研究中，对Ti合金Ti6Al4V进行了不同的热处理条件，如退火，固溶处理（ST），固溶处理+时效处理（STA），以及预焊/后焊组合的不同组合。通过熔合区（FZ）的微观结构，显微硬度和拉伸性能来分析其影响。显微组织表明存在细的α / α '颗粒和次生α，负责改善焊接性能。在所有焊前或焊后热处理情况下，焊缝的显微硬度均显示FZ的硬度增加，除了ST + EBW + Age / STA + EBW处理的样品。所有FZ的显微硬度增加表明热处理的焊件结构具有良好的响应。对于STA样品，发现焊件的显微硬度降低。与焊接结构相比，这是因为STA母体金属具有更高的性能。发现性能（强度和伸长率）最佳组合的最佳条件是ST + EBW + STA和/或退火+ EBW + STA。