英语翻译Two pass and three pass bead-over-bead (BoB) electron be

英语翻译
Two pass and three pass bead-over-bead (BoB) electron beam weld technique was attempted on Ti6Al4V to improve its Charpy impact and fracture toughness of weld metal portion.Hardness and microstructural studies were also done to support the findings.The hardness values of the weld metals were found to be higher than their base metal counterpart.The weld metal hardness came down when deposited with bead-over-bead technique.Conventional stringer bead welding caused reduction in Charpy impact toughness compared to its base metal counterpart.Bead-over-bead technique improved the notch toughness of weld metals.The fracture toughness values of the weld metals were found to be superior to that of base metal.This is in contrast to the Charpy impact toughness values where the impact toughness of base metal was better than the stringer and bead-over-bead weld metals.The better fracture toughness of weld metals was related to the basket-weave structure compared to the equi-axed structure of base metal.Bead-over-bead technique was found to help in improving the fracture toughness of weld metal further.Overall,the study showed that the bead-over-bead technique improved both notch toughness and fracture toughness of Ti6Al4V electron beam weld metals.

两证及三证珠子超过珠（鲍勃）电子束焊接技术,企图对了Ti6Al4V ,以改善其冲击和断裂韧性的焊缝金属部分.硬度和微观研究方面也做支持的结果.硬度值的焊缝金属被发现高于其金属基体的对应.焊缝金属的硬度下降,当存放珠子超过珠技术.常规斯特林格堆焊造成减少冲击韧性相比,其金属基体的对应.珠子超过珠子技术改善了缺口韧性的焊缝金属.断裂韧性值的焊缝金属被认为优于表示贱金属.这是比照去冲击韧性值如冲击韧性贱金属优于Stringer和珠子超过堆焊金属.较好的断裂韧性的焊缝金属与一篮子编织结构相比,该等距axed结构贱金属.珠子超过珠子技术被发现,以协助改善断裂韧性的焊缝金属进一步.总体而言,研究结果显示,这个珠子超过珠子技术改进两缺口韧性和断裂韧性了Ti6Al4V电子束焊接金属.