随着V含量的增加，焊后热处理熔敷金属屈服强度和抗拉强度同时增加，V20熔敷金属屈服强度和抗拉强度分别高达943 ± 22 MPa和1061 ± 21 MPa。焊后热处理试样的夏比冲击能随温度的降低而降低。对于焊后热处理试样，随着V含量的增加，夏比冲击能呈现下降趋势。然而，值得注意的是，V水平的进一步增加并没有导致每种温度下夏比冲击能量的进一步降低。采用TIG焊可达到课题指标要求。

With increasing V contents, the YS and UTS of PWHT specimens were greatly improved for up to the peak values with a YS of 943 ± 22 MPa and a UTS of 1061 ± 21 MPa in V20 PWHT specimen. The Charpy impact energies decreased with decreasing temperature for PWHT specimens. For PWHT specimens, the Charpy impact energies exhibited a descending trend as V contents increased first. However, it is worth noting that a further increase in V levels did not lead to a further decrease in Charpy impact energies at every temperature. TIG welding can meet the subject index requirements.