本发明提供了一种焊缝，属于合金制备技术领域。本发明提供的焊缝包括以下质量百分含量的元素：C 0.03～0.09％，Si 0.15～0.5％，Mn 1.0～1.7％，Ni 0.5～1％，Mo 0.4～0.7％，Cr≤0.5％，Cu 0.06～0.10％，Nb≤0.01％，V≤0.01％，S≤0.01％，P≤0.01％，余量为Fe和不可避免的杂质。从实施例可以看出，本发明的焊缝抗拉强度达750～900MPa，在‑50℃下低温冲击功Akv为75～89J。

The invention provides a welding seam, which belongs to the technical field of alloy preparation. The welds provided by the invention include elements with the following mass percentage content: C 0.03 ~ 0.09%, Si 0.15 ~ 0.5%, Mn 1.0 ~ 1.7%, Ni 0.5 ~ 1%, Mo 0.4 ~ 0.7%, Cr≤ 0.5%, Cu 0.06 ~ 0.10%, Nb≤ 0.01%, V≤ 0.01%, S≤ 0.01%, P≤ 0.01%, Allowance for Fe and unavoidable impurities. It can be seen from the embodiment that the weld tensile strength of the invention is 750 ~ 900MPa, and the low-temperature impact energy Akv is 75 ~ 89J at 50℃.